Articles de revues sur le sujet « Common variable immunodeficiency, immunodeficiency, genetics, whole-exome sequencing »
Pour voir les autres types de publications sur ce sujet consultez le lien suivant : Common variable immunodeficiency, immunodeficiency, genetics, whole-exome sequencing.
Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres
Consultez les 28 meilleurs articles de revues pour votre recherche sur le sujet « Common variable immunodeficiency, immunodeficiency, genetics, whole-exome sequencing ».
À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.
Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.
Parcourez les articles de revues sur diverses disciplines et organisez correctement votre bibliographie.
1
Li, Ran, Yali Zheng, Yuqian Li, Rongbao Zhang, Fang Wang, Donghong Yang, Yanliang Ma, Xinlin Mu, Zhaolong Cao et Zhancheng Gao. « Common Variable Immunodeficiency with Genetic Defects Identified by Whole Exome Sequencing ». BioMed Research International 2018 (30 septembre 2018) : 1–7. http://dx.doi.org/10.1155/2018/3724630.
Texte intégralRésumé :
Common variable immunodeficiency (CVID) belongs to the primary immunodeficiency disorders (PIDs), presenting a profound heterogeneity in phenotype and genotype, with monogenic or complex causes. Recurrent respiratory infections are the most common clinical manifestations. CVID patients can also develop various autoimmune and lymphoproliferative complications. Genetic testing such as whole exome sequencing (WES) can be utilized to investigate likely genetic defects, helping for better clinical management. We described the clinical phenotypes of three sporadic cases of CVID, who developed recurrent respiratory infections with different autoimmune and lymphoproliferative complications. WES was applied to screen disease-causing or disease-associated mutations. Two patients were identified to have monogenic disorders, with compound heterozygous mutations in LRBA for one patient and a frameshift insertion in NFKB1 for another. The third patient was identified to be a complex form of CVID. Two novel mutations were identified, respectively, in LRBA and NFKB1. A combination of clinical and genetic diagnosis can be more extensively utilized in the clinical practice due to the complexity and heterogeneity of CVID.
2
Lui, Victor, Ryan Baxter, John Michael Routes, James Verbsky et Elena WY Hsieh. « Understanding Genetic and Immune Cellular-Signaling Defects in Common Variable Immunodeficiency with Granulomatous Lymphocytic Interstitial Lung Disease ». Journal of Immunology 204, no 1_Supplement (1 mai 2020) : 146.18. http://dx.doi.org/10.4049/jimmunol.204.supp.146.18.
Texte intégralRésumé :
Abstract Common Variable Immunodeficiency (CVID) is a heterogenous disorder characterized by hypogammaglobulinemia, failure to mount vaccine responses, recurrent sinopulmonary infections. Furthermore, a subset of CVID patients develop various autoimmune and lymphoproliferative complications, highlighting the dysregulated immune mechanisms underlying the disorder. One such autoimmune complication is granulomatous lymphocytic interstitial lung disease (GLILD) which is a major cause of mortality in CVID. The clinical heterogeneity of CVID indicate that it is a collection of disorders with monogenic and polygenic defects. Due to the genetic and phenotypic complexity of CVID, our understanding of the immunopathogenesis of CVID and the development of its complications is limited. Our goal is to elucidate relationships between genetic variants and their downstream phenotypic and signaling defects in CVID patients with GLILD. We hypothesize that specific genetic variants will result in unique immune cellular (and signaling) signatures in CVID with GLILD. To identify these cellular and molecular signatures, we integrate whole exome sequencing and mass cytometry data. We examined cellular subsets affected by perturbed T and B cell receptor signaling pathways via mass cytometry, and then correlate these signatures with specific genetic variants identified through whole exome sequencing. These results will reveal mechanisms of immune dysregulation in CVID with GLILD. In CVID patients with GLILD, we find expansion of CD57+ CD8+ T cells, which may represent a class of senescent cells. We also find enrichment of CD21-low B cells within CVID patients, regardless of GLILD status.
3
Abolhassani, Hassan, Lennart Hammarström et Charlotte Cunningham-Rundles. « Current genetic landscape in common variable immune deficiency ». Blood 135, no 9 (27 février 2020) : 656–67. http://dx.doi.org/10.1182/blood.2019000929.
Texte intégralRésumé :
Abstract Using whole-exome sequencing to examine the genetic causes of immune deficiency in 235 common variable immunodeficiency (CVID) patients seen in the United States (Mount Sinai, New York), 128 patients from Sweden, and 208 from Iran revealed 68 known disease-causing genes underlying this heterogeneous immune defect. The patients at the time of study ranged from 4 to 90 years of age. Overall, 31%, 36%, and 54% of the patients in the US, Swedish, or Iranian cohorts had mutations. The multiplicity of genes identified in the 571 subjects reflects the complex requirements of B-cell antigen signaling, activation, survival, migration, maturation, and maintenance of antibody-secreting memory B-cell populations to the plasma cell stage. For the US and Swedish cohorts, CVID subjects with noninfectious complications, lymphoid infiltrations, inflamatory conditions, or autoimmunity were somewhat more likely to have an identifiable gene, but in both cohorts, numerous subjects with these medical conditions had no potential gene that could be assigned. Specific clinical patterns of illnesses were also not linked to any given gene defect as there was considerable overlap in clinical presentations. These observations led to a new perspective on the complexity of the immunologic phenotype found in CVID syndrome.
4
Keller, Michael, Joseph Glessner, Hakon Hakonarson et Jordan Orange. « IFR2BP2 Mutations Identified As a Novel Genetic Cause of Familial Common Variable Immunodeficiency Identified Via Support Vector Algorithm and Whole Exome Sequencing ». Journal of Allergy and Clinical Immunology 131, no 2 (février 2013) : AB140. http://dx.doi.org/10.1016/j.jaci.2012.12.1163.
Texte intégral
5
Russo, Roberta, Immacolata Andolfo, Vito Alessandro Lasorsa, Sueva Cantalupo, Roberta Marra, Giulia Frisso, Pasquale Abete et al. « The TNFRSF13C H159Y Variant Is Associated with Severe COVID-19 : A Retrospective Study of 500 Patients from Southern Italy ». Genes 12, no 6 (8 juin 2021) : 881. http://dx.doi.org/10.3390/genes12060881.
Texte intégralRésumé :
To identify host genetic determinants involved in humoral immunity and associated with the risk of developing severe COVID-19, we analyzed 500 SARS-CoV-2 positive subjects from Southern Italy. We examined the coding sequences of 10 common variable immunodeficiency-associated genes obtained by the whole-exome sequencing of 121 hospitalized patients. These 10 genes showed significant enrichment in predicted pathogenic point mutations in severe patients compared with the non-severe ones. Moreover, in the TNFRSF13C gene, the minor allele of the p.His159Tyr variant, which is known to increase NF-kB activation and B-cell production, was significantly more frequent in the 38 severe cases compared to both the 83 non-severe patients and the 375 asymptomatic subjects further genotyped. This finding identified a potential genetic risk factor of severe COVID-19 that not only may serve to unravel the mechanisms underlying the disease severity but, also, may contribute to build the rationale for individualized management based on B-cell therapy.
6
Nasomyont, Nat, Andrew W. Lindsley, Amal Assa'ad, D. Brian Dawson, Derek E. Neilson, Cassandra C. Brady et Meilan M. Rutter. « Central Diabetes Insipidus in a Patient With NFKB2 Mutation : Expanding the Endocrine Phenotype in DAVID Syndrome ». Journal of Clinical Endocrinology & ; Metabolism 104, no 9 (31 mai 2019) : 4051–57. http://dx.doi.org/10.1210/jc.2019-00469.
Texte intégralRésumé :
Abstract Context Deficient anterior pituitary with variable immune deficiency (DAVID) syndrome is a recently described, rare disorder characterized by anterior pituitary hormone deficiencies and common variable immunodeficiency associated with NFKB2 mutations. Posterior pituitary hormone deficiencies have not been reported in patients with DAVID syndrome. Case Description We report a pediatric patient who initially presented with hypogammaglobulinemia and alopecia totalis, who was identified to have a de novo NFKB2 mutation at one year of age. He developed central diabetes insipidus and central adrenal insufficiency at three and four years of age, respectively. At seven years of age, he had not developed GH or TSH deficiencies. Whole exome sequencing ruled out known genetic causes of central diabetes insipidus, adrenal insufficiency, and hypopituitarism. Conclusion This is a report of central diabetes insipidus in a patient with DAVID syndrome caused by an NFKB2 mutation. This case report expands the evolving endocrine phenotype associated with NFKB2 mutations beyond anterior pituitary deficiencies.
7
Mandola, Amarilla B., et Nigel Sharfe. « Novel heterozygous NFKB1 mutation—variable penetrance in a family cohort ». LymphoSign Journal 6, no 3 (1 septembre 2019) : 95–105. http://dx.doi.org/10.14785/lymphosign-2019-0010.
Texte intégralRésumé :
Background: Common variable immunodeficiency (CVID) is a term used to define a heterogeneous group of patients who commonly have hypogammaglobulinemia and variable degrees of modest T cell dysfunction. Recent advances made in next generation sequencing technologies have accelerated the identification of CVID disease-causing genes, including NFKB1, a component of the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway. Objective: We sought to identify the genetic defect in a 3-generation family of patients with CVID who presented with cytopenias, eczema, and recurrent sinopulmonary infections. Methods: Whole exome sequencing and Sanger confirmation was performed, and a combination of molecular and cellular techniques used to assess the variant impact on B and T cell function. Results: A novel heterozygous frameshift mutation in NFKB1, encoding the transcriptional regulator protein p50/p105, was identified. This resulted in c.1584dupG (p.M528fs). We demonstrate that c.1584dupG is a loss-of-function variant, responsible for reduced p105/p50 protein expression in affected individuals as well as variable increased CD21low B cell numbers. Conclusion: This novel mutation affecting NFKB1 causes a CVID phenotype with variable clinical manifestations. Given the wide spectrum of age in this kindred, this may reflect diversity of phenotype expression, or more probably, age-related expression of typical features. Statement of novelty: We report here a novel loss-of-function frameshift mutation in NFKB1.
8
Rolles, Benjamin, Alla Bulashevska, Michele Proietti, Sigune Goldacker, Klaus Warnatz, Nadezhda Camacho-Ordonez, Margherita Vieri et al. « Common Variable Immunodeficiency (CVID) in Adults As First Manifestation of (cryptic) Dyskeratosis Congenita ». Blood 134, Supplement_1 (13 novembre 2019) : 1217. http://dx.doi.org/10.1182/blood-2019-128915.
Texte intégralRésumé :
Introduction: Dyskeratosis Congenita (DKC) is caused by mutations in genes related to telomere maintenance resulting in prematurely shortened telomeres. Clinically, classical DKC is characterized by mucocutaneous abnormalities, bone marrow failure and other variable features such as lung or liver fibrosis. In adults, mono- or oligosymptomatic DKC is typically presenting with a clinically more heterogeneous and often cryptic picture without classical symptoms of DKC. Data on immunodeficiency as a predominant symptom in DKC patients is limited. The common variable immunodeficiency (CVID) represents a heterogenous group of disease with no universally accepted definition. Typically, patients show hypogammaglobulinaemia and impaired vaccine response. In most cases the genetic basis of CVID remains unknown and to date, the disease is primarily via exclusion of other reasons for hypogammaglobulinaemia. In this study, we aimed to retrospectively analyze the frequency and characteristics of adult patients with altered telomere maintenance (manifesting themselves as "cryptic DKC") within a well-defined cohort of patients with clinical findings of CVID. Materials and Methods: 200 patients of the Freiburg registry of adult CVID patients underwent whole-exome sequencing (WES). Diagnosis of CVID was established based on the recommendations of the European Society of Immune Deficiencies. Retrospectively, all patients were screened for mutations/variants in the following DKC causing genes: TERT, RTEL1, DKC1, NHP2, TERC, NOP10, TCAB1, TIN2 and CTC1. Screening identified 23 patients (age: 45 +/- 13 years; mean +/- S.D.) with mutations/polymorphisms in these genes. All identified variants were heterozygous. One patient showed polymorphisms in three different genes. To analyze the functional consequences on telomere maintenance, telomere length (TL) of peripheral blood mononuclear cells (PBMCs) were analyzed via MM-Q-PCR in all 23 patients. Furthermore, Flow-FISH analysis of lymphocytes as well as granulocytes was carried out in 22 and 14 patients, respectively. Results: TL analysis measured with MM-Q-PCR showed in most of the 23 patients shortened TL compared to an age-matched control group. We measured premature TL shortening below the 1% percentile in 44% (10/23) and below the 10% percentile in 52% (12/23). TL determined via flow-FISH showed TL in lymphocytes below the 10% percentile in 64% (14/22) and below 1% in 27% (6/22). WES revealed 24 polymorphisms/mutations in RTEL1 (n=5), TERT (n=3), NHP2 (n=6), DKC1 (n=8) and CTC1 (n=2). Based on bioinformatic prediction, 78 % (19/24) of all polymorphisms were classified as likely benign variants. Two patients with pathogenic mutations were identified: One 30 year old patient with previously described pathogenic TERT mutation (c.1234C>T, p.His412Tyr) was identified showing lymphocyte and granulocyte TL with flow-FISH between the 1% and 10% percentile and below the 1% percentile using MM-Q-PCR. One 23 year old patient with a bioinformatic predicted pathogenic mutation in RTEL1 (c.2313_2315delAGA, p.Glu771del) showed TL in flow-FISH and MM-Q-PCR below the 1% percentile. Of note, this patient developed few years after initial CVID diagnosis severe interstitial lung disease. Three patients were identified with possible DKC showing variants of unknown significance in the RTEL1 (41 years: c.380G>A, p.Arg127Gln) and TERT (65 years: c.3257G>A, p.Arg1086His and 42 years: c.1843G>A, p.Ala615Thr) gene having both TL in lymphocytes/granulocytes (flow-FISH) and leukocytes (MM-Q-PCR) below the 5% percentile. Conclusions: Clinical signs of immunodeficiency can be a rare first manifestation of cryptic/late-onset DKC in adult patients. We found out that at least 1% of all patients with CVID syndrome is caused by mutations typically found in DKC. Our data adds a further important clinical manifestation to the broad clinical spectrum of cryptic DKC. In return, awareness of CVID as a possible first manifestation of cryptic DKC can improve patient management. TL analysis in addition to genetic work-up provides a valuable tool to identify DKC as underlying disease of CVID and other disorders characterized by impaired replicative potential. Disclosures Brümmendorf: Ariad: Consultancy; Merck: Consultancy; University Hospital of the RWTH Aachen: Employment; Pfizer: Consultancy, Research Funding; Novartis: Consultancy, Research Funding; Janssen: Consultancy. Beier:Novartis: Honoraria; Repeat Dx: Other: Partner.
9
Sviridov, Philipp S., Natalia A. Bodunova, Anastasiia M. Danishevich et Mariia M. Litvinova. « TNFRSF13B gene mutation in adult patient with common variable immunodeficiency. Case report ». Terapevticheskii arkhiv 93, no 12 (15 décembre 2021) : 1522–27. http://dx.doi.org/10.26442/00403660.2021.12.201176.
Texte intégralRésumé :
Common variable immunodeficiency (CVID) is one form of the primary immunodeficiencies (PIDs). CVID is characterized by variable clinical manifestations. Genetic alteration is a cause of the disease in many cases. In the current paper we described Patient N of 45 years old, who have been suffering from frequent various infections and therefore attended an immunologist and clinical geneticist. Immunoglobulins (Ig) A, M, and G deficiency was found in the patient. As a result of medical genetic counselling primary immunodeficiency has been suggested as a diagnosis. Further molecular genetic testing using clinical exome sequencing (Next Generation Sequencing method) revealed a likely-pathogenic variant c.204dupA (p.Leu69ThrfsX12, rs72553875) of TNFRSF13B gene in the patient. The gene variant was found in homozygous state. According to the international medical literature and genomic databases TNFRSF13B gene mutations lead to the CVID development and in some patients are characterized by isolated IgA deficiency and in the other group of patients can lead to decrease of IgA, IgM, and IgG. The patient had a family history of cancer and autoimmune inflammatory bowel disease (erosive-ulcerative enterocolitis). Moreover, one sibling of the patient died at the age of 3 weeks from complications of toxoplasmosis infection. The other sibling of 51 years old have been also suffering from recurrent infectious diseases. Thus, the genetic cause of the disease was identified in the proband. It has been shown that homozygosity for variant c.204dupA of TNFRSF13B gene is characterized by the deficiency of all three classes of Ig. Medical genetic counselling and modern molecular genetic methods application is an important step in management of people with signs of immunodeficiency. Such approach helps to make a diagnosis to the patient, to find an exact molecular reason of the condition, to use effective treatment, and to perform preventive measures in patient`s family.
10
Mat Ripen, Adiratna, Hamidah Ghani, Chai Teng Chear, Mei Yee Chiow, Sharifah Nurul Husna Syed Yahya, Asiah Kassim et Saharuddin Bin Mohamad. « Whole exome sequencing identifies compound heterozygous variants of CR2 gene in monozygotic twin patients with common variable immunodeficiency ». SAGE Open Medicine 8 (janvier 2020) : 205031212092265. http://dx.doi.org/10.1177/2050312120922652.
Texte intégralRésumé :
Objectives: A pair of female Malay monozygotic twins who presented with recurrent upper respiratory tract infections, hepatosplenomegaly, bronchiectasis and bicytopenia were recruited in this study. Both patients were suspected with primary immunodeficiency diseases. However, the definite diagnosis was not clear due to complex disease phenotypes. The objective of this study was to identify the causative gene mutation in these patients. Methods: Lymphocyte subset enumeration test and whole exome sequencing were performed. Results: We identified a compound heterozygous CR2 mutation (c.1916G>A and c.2012G>A) in both patients. These variants were then confirmed using Sanger sequencing. Conclusion: Whole exome sequencing analysis of the monozygotic twins revealed compound heterozygous missense mutations in CR2.
11
Lal, Rayhan A., Laura K. Bachrach, Andrew R. Hoffman, Jingga Inlora, Shannon Rego, Michael P. Snyder et David B. Lewis. « A Case Report of Hypoglycemia and Hypogammaglobulinemia : DAVID Syndrome in a Patient With a Novel NFKB2 Mutation ». Journal of Clinical Endocrinology & ; Metabolism 102, no 7 (3 mai 2017) : 2127–30. http://dx.doi.org/10.1210/jc.2017-00341.
Texte intégralRésumé :
Abstract Context: Deficient anterior pituitary with variable immune deficiency (DAVID) syndrome is a rare disorder in which children present with symptomatic adrenocorticotropic hormone (ACTH) deficiency preceded by hypogammaglobulinemia from B-cell dysfunction with recurrent infections, called common variable immunodeficiency (CVID). Subsequent whole exome sequencing studies have revealed germline heterozygous C-terminal mutations of NFKB2 as a cause of DAVID syndrome or of CVID without clinical hypopituitarism. However, to the best of our knowledge there have been no cases in which the endocrinopathy has presented in the absence of a prior clinical history of CVID. Case Description: A previously healthy 7-year-old boy with no history of clinical immunodeficiency presented with profound hypoglycemia and seizures. He was found to have secondary adrenal insufficiency and was started on glucocorticoid replacement. An evaluation for autoimmune disease, including for antipituitary antibodies, was negative. Evaluation unexpectedly revealed hypogammaglobulinemia [decreased immunoglobulin G (IgG), IgM, and IgA]. He had moderately reduced serotype-specific IgG responses after pneumococcal polysaccharide vaccine. Subsequently, he was found to have growth hormone deficiency. Six years after initial presentation, whole exome sequencing revealed a de novo heterozygous NFKB2 missense mutation c.2596A>C (p.Ser866Arg) in the C-terminal region predicted to abrogate the processing of the p100 NFKB2 protein to its active p52 form. Conclusions: Isolated early-onset ACTH deficiency is rare, and C-terminal region NFKB2 mutations should be considered as an etiology even in the absence of a clinical history of CVID. Early immunologic evaluation is indicated in the diagnosis and management of isolated ACTH deficiency.
12
Hill, Adrian V. S. « Evolution, revolution and heresy in the genetics of infectious disease susceptibility ». Philosophical Transactions of the Royal Society B : Biological Sciences 367, no 1590 (19 mars 2012) : 840–49. http://dx.doi.org/10.1098/rstb.2011.0275.
Texte intégralRésumé :
Infectious pathogens have long been recognized as potentially powerful agents impacting on the evolution of human genetic diversity. Analysis of large-scale case–control studies provides one of the most direct means of identifying human genetic variants that currently impact on susceptibility to particular infectious diseases. For over 50 years candidate gene studies have been used to identify loci for many major causes of human infectious mortality, including malaria, tuberculosis, human immunodeficiency virus/acquired immunodeficiency syndrome, bacterial pneumonia and hepatitis. But with the advent of genome-wide approaches, many new loci have been identified in diverse populations. Genome-wide linkage studies identified a few loci, but genome-wide association studies are proving more successful, and both exome and whole-genome sequencing now offer a revolutionary increase in power. Opinions differ on the extent to which the genetic component to common disease susceptibility is encoded by multiple high frequency or rare variants, and the heretical view that most infectious diseases might even be monogenic has been advocated recently. Review of findings to date suggests that the genetic architecture of infectious disease susceptibility may be importantly different from that of non-infectious diseases, and it is suggested that natural selection may be the driving force underlying this difference.
13
Abolhassani, Hassan, Yasser M. El-Sherbiny, Gururaj Arumugakani, Clive Carter, Stephen Richards, Dylan Lawless, Philip Wood et al. « Expanding Clinical Phenotype and Novel Insights into the Pathogenesis of ICOS Deficiency ». Journal of Clinical Immunology 40, no 2 (20 décembre 2019) : 277–88. http://dx.doi.org/10.1007/s10875-019-00735-z.
Texte intégralRésumé :
Abstract Background Inducible T cell co-stimulator (ICOS) deficiency has been categorized as a combined immunodeficiency often complicated by enteropathies, autoimmunity, lymphoproliferation, and malignancy. We report seven new patients and four novel ICOS mutations resulting in a common variable immunodeficiency (CVID)–like phenotype and show that dysregulated IL-12 release, reduced cytotoxic T lymphocyte–associated protein 4 (CTLA4) expression, and skewing towards a Th1-dominant phenotype are all associated with inflammatory complications in this condition. Methods A combination of whole exome and Sanger sequencing was used to identify novel mutations. Standard clinical and immunological evaluation was performed. FACS and ELISA-based assays were used to study cytokine responses and ICOS/ICOSL/CTLA4 expression following stimulation of whole blood and PBMCs with multiple TLR ligands, anti-CD3, and PHA. Results Four novel ICOS mutations included homozygous c.323_332del, homozygous c.451C>G, and compound heterozygous c.58+1G>A/c.356T>C. The predominant clinical phenotype was that of antibody deficiency associated with inflammatory complications in 4/7 patients. Six out of seven patients were treated with immunoglobulin replacement and one patient died from salmonella sepsis. All patients who were tested showed reduced IL-10 and IL-17 cytokine responses, normal IL-1β, IL6, and TNF release following LPS stimulation and highly elevated IL-12 production in response to combined LPS/IFNγ stimulation. This was associated with skewing of CD4+ T cells towards Th1 phenotype and increased expression of ICOSL on monocytes. Lastly, reduced CTLA4 expression was found in 2 patients. One patient treated with ustekinumab for pancytopenia due to granulomatous bone marrow infiltration failed to respond to this targeted therapy. Conclusions ICOS deficiency is associated with defective T cell activation, with simultaneously enhanced stimulation of monocytes. The latter is likely to result from a lack of ICOS/ICOSL interaction which might be necessary to provide negative feedback which limits monocytes activation.
14
Barua, Subit, Sara Berger, Elaine M. Pereira et Vaidehi Jobanputra. « Expanding the phenotype of ATP6AP1 deficiency ». Molecular Case Studies 8, no 4 (juin 2022) : a006195. http://dx.doi.org/10.1101/mcs.a006195.
Texte intégralRésumé :
Vacuolar ATPases (V-ATPases) are large multisubunit proton pumps conserved among all eukaryotic cells that are involved in diverse functions including acidification of membrane-bound intracellular compartments. The ATP6AP1 gene encodes an accessory subunit of the vacuolar (V)-ATPase protein pump. Pathogenic variants in ATP6AP1 have been described in association with a congenital disorder of glycosylation (CDG), which are highly variable, but often characterized by immunodeficiency, hepatopathy, and neurologic manifestations. Although the most striking and common clinical feature is hepatopathy, the phenotypic and genotypic spectrum of ATP6AP1-CDG continues to expand. Here, we report identical twins who presented with acute liver failure and jaundice. Prenatal features included cystic hygroma, atrial septal defect, and ventriculomegaly. Postnatal features included pectus carinatum, connective tissue abnormalities, and hypospadias. Whole-exome sequencing (WES) revealed a novel de novo in-frame deletion in the ATP6AP1 gene (c.230_232delACT;p.Tyr77del). Although both twins have the commonly reported clinical feature of hepatopathy seen in other individuals with ATP6AP1-CDG-related disorder, they do not have neurological sequelae. This report expands the phenotypic spectrum of ATP6AP1-CDG-related disorder with both probands exhibiting unique prenatal and postnatal features, including fetal ventriculomegaly, umbilical hernia, pectus carinatum, micropenis, and hypospadias. Furthermore, this case affirms that neurological features described in the initial case series on ATP6AP1-CDG do not appear to be central, whereas the prenatal and connective tissue manifestations may be more common than previously thought. This emphasizes the importance of long-term clinical follow-up and variant interpretation using current updated recommendations.
15
Wong, Jasper, Brett Collinge, Laura K. Hilton, Susana Ben-Neriah, Graham W. Slack, Pedro Farinha, James R. Cook et al. « The Genomic Landscape of Plasmablastic Lymphoma (PBL) - an L.L.M.P.P. Project ». Blood 138, Supplement 1 (5 novembre 2021) : 1326. http://dx.doi.org/10.1182/blood-2021-153441.
Texte intégralRésumé :
Abstract Introduction: Plasmablastic lymphoma (PBL) is an aggressive B-cell lymphoma that predominantly occurs in patients with HIV or other causes of immunodeficiency. Frequent infection by the Epstein-Barr virus (EBV) and MYC translocations have been described as major features contributing to the pathogenesis of PBL. Prior studies examining the genetic landscape of PBL have largely relied on targeted capture-based sequencing approaches. As such, the molecular features of PBL remain to be fully explored. Here, we provide a comprehensive description of the genomic landscape of PBL using whole-genome and whole-exome sequencing to identify commonly perturbed pathways. Method: Archival diagnostic fresh frozen and formalin fixed paraffin embedded tissue biopsies from 58 PBL tumours were accrued from Lymphoma/Leukemia Molecular Profiling Project (LLMPP) sites, including 15 tumours from Ramis-Zaldivar et al., Haematolgica 2021. MYC rearrangements were identified by break-apart fluorescent in situ hybridization (FISH) and rearrangement partner was determined in a subset of tumours from capture or genome sequencing data using structural variant callers Manta, GRIDSS, and Delly. High confidence somatic mutations (SNVs/Indels) were identified in data from whole-genome (n=5) or whole-exome (n=53) sequencing through an ensemble voting approach utilizing four variant callers (Strelka2, Lofreq, Mutect2, SAGE). Mutation frequencies in known lymphoma-related genes were compared to activated B-cell (ABC)-DLBCL (Schmitz et al., NEJM 2018), as the closest tumour entity in terms of putative cell-of-origin differentiation stage, to identify differences in genetic aberrations. Candidate somatic copy number alterations (CNAs) were identified from exome and genome sequencing data, using CopywriteR and ControlFREEC, respectively, and high-confidence CNAs were determined using GISTIC2.0. Results: Within the study cohort, 81% of patients were male with a median age of 59 years (range 11-88). HIV and EBV statuses were available for 47% of patients and 95% of tumours, respectively, with 49% (13/27) of the patients being HIV+ and 69% (38/55) of tumours being EBV+. MYC rearrangement was observed in 60% (35/58) of PBLs, with IGH as the partner gene in 88% (21/24) of tumours. The most frequently mutated genes were STAT3 (38%), TP53 (22%), NRAS (21%), and TET2 (16%), consistent with previous studies, however novel mutations were seen in DUSP2 (21%), KLHL6 (16%), and BHLHE41 (16%). Recurrent CNAs included amplifications in 1q, whole gains of 7, 8q24, 11p12 and deletions affecting 4p16, 5p15, 10q11.22. While the mutational landscapes were similar between samples with and without a MYC translocation, the MYC-translocated PBLs showed more frequent amplification of 1q32.1. When stratifying by EBV status, STAT3 and SOCS1 mutations were more frequent in EBV-positive tumours, whereas TP53, TET2, KRAS, and MMRN2 mutations were associated with EBV-negativity. In comparison to ABC-DLBCL, PBLs were significantly enriched in STAT3 and NRAS mutations, and lacked common mutations affecting the NF-κB pathway (eg. MYD88, CD79B, and NFKBIZ 3' UTR mutations). Mutations in genes that are frequently mutated in ABC-DLBCLs, such as those associated with plasma cell differentiation (eg. PRDM1) or a memory B-cell fate (eg. TBL1XR1), were also not mutated in PBLs. Finally, genetic alterations associated with immune evasion, such as deletion of MHC I and II and mutations in B2M, CIITA, and CD58, were rarely observed. Conclusion: These data present a comprehensive overview of the genomic landscape of PBLs in a large cohort. We show frequent mutations involving the JAK-STAT and MAPK pathways, wherein the genetic landscape can be differentially characterized by EBV status and MYC rearrangement status. We show that PBLs are genetically distinct from ABC-DLBCLs, with absence of mutations in genes affecting the NF-κB pathway, immune evasion, and driving a memory B-cell fate. Disclosures Slack: Seagen: Consultancy, Honoraria. Raess: Scopio Labs: Research Funding. Holte: Gilead: Membership on an entity's Board of Directors or advisory committees; Roche: Membership on an entity's Board of Directors or advisory committees; Nordic: Membership on an entity's Board of Directors or advisory committees; Nanovector: Membership on an entity's Board of Directors or advisory committees, Other: lectures honorarias; Novartis: Membership on an entity's Board of Directors or advisory committees; Takeda: Membership on an entity's Board of Directors or advisory committees. Savage: Servier: Consultancy, Honoraria; Roche: Research Funding; BMS: Consultancy, Honoraria, Other: Institutional clinical trial funding; Astra-Zeneca: Consultancy, Honoraria; Merck: Consultancy, Honoraria, Other: Institutional clinical trial funding; AbbVie: Consultancy, Honoraria; Seattle Genetics: Consultancy, Honoraria; Takeda: Other: Institutional clinical trial funding; Beigene: Other: Institutional clinical trial funding; Genentech: Research Funding. Steidl: Seattle Genetics: Consultancy; Curis Inc.: Consultancy; Bayer: Consultancy; Epizyme: Research Funding; Trillium Therapeutics: Research Funding; AbbVie: Consultancy; Bristol-Myers Squibb: Research Funding. Rimsza: NanoString Technologies: Other: Fee-for-service contract. Morin: Foundation for Burkitt Lymphoma Research: Membership on an entity's Board of Directors or advisory committees; Celgene: Consultancy; Epizyme: Patents & Royalties. Scott: Abbvie: Consultancy; AstraZeneca: Consultancy; Rich/Genentech: Research Funding; BC Cancer: Patents & Royalties: Patent describing assigning DLBCL COO by gene expression profiling--licensed to NanoString Technologies. Patent describing measuring the proliferation signature in MCL using gene expression profiling. ; Incyte: Consultancy; Janssen: Consultancy, Research Funding; Celgene: Consultancy; NanoString Technologies: Patents & Royalties: Patent describing measuring the proliferation signature in MCL using gene expression profiling..
16
Maffucci, Patrick, Charles A. Filion, Bertrand Boisson, Yuval Itan, Lei Shang, Jean-Laurent Casanova et Charlotte Cunningham-Rundles. « Genetic Diagnosis Using Whole Exome Sequencing in Common Variable Immunodeficiency ». Frontiers in Immunology 7 (13 juin 2016). http://dx.doi.org/10.3389/fimmu.2016.00220.
Texte intégral
17
Ren, Yanling, Feng Xiao, Fei Cheng, Xin Huang, Jianhu Li, Xiaogang Wang, Wei Lang, Xinping Zhou, Jianping Lan et Hongyan Tong. « Whole exome sequencing reveals a novel LRBA mutation and clonal hematopoiesis in a common variable immunodeficiency patient presented with hemophagocytic lymphohistiocytosis ». Experimental Hematology & ; Oncology 10, no 1 (13 juin 2021). http://dx.doi.org/10.1186/s40164-021-00229-y.
Texte intégralRésumé :
AbstractCommon variable immunodeficiency (CVID) was a kind of primary immunodeficiency disorders with heterogeneous phenotype and genotype. Lipopolysaccharide-responsive and beige-like anchor (LRBA) mutation was identified as disease associated in CVID, advanced genetic method will help to detect atypical cases. We report a case of adult patient manifested as hemophagocytic lymphohistiocytosis (HLH), bone marrow examination suggested prosperity to MDS, manifested as increased immature myeloid cells and dysplastic hematopoiesis. Whole exome sequencing (WES) identified a novel heterogeneous c.1876T > C (p.W626R) mutation in LRBA and four somatic mutations: ASXL1 (c.1967dupA); PTPN11 (c.226G > A), U2AF1 (c.101C > T and c.470A > G), among which ASXL1 was a high-risk marker of clonal hematopoiesis. Combined with her recurrent severe infections and immune abnormalities such as hypoimmunoglobulinemia, the patient was diagnosed with CVID. Subsequent hematopoietic stem cell transplantation saved her from severe cytopenia and immune deficiency. This case report highlights the great promise of utilization of WES for diagnosing rare disease with atypical manifestations and guiding further treatment.
18
Liu, Anli, Qiang Liu, Shaoqiu Leng, Xiaoyu Zhang, Qi Feng, Jun Peng et Gege Feng. « Identification of novel NFKB1 and ICOS frameshift variants in patients with CVID ». Clinical and Experimental Immunology, 26 décembre 2022. http://dx.doi.org/10.1093/cei/uxac121.
Texte intégralRésumé :
Abstract Common variable immunodeficiency (CVID) is a “late-onset” primary immunodeficiency characterized by variable manifestations and genetic heterogeneity. A monogenic cause of CVID has been reported in 10% of patients. In this study, we identified two novel pathogenic variants implicated in monogenic CVID by whole exome sequencing (WES) analysis: a heterozygous nuclear factor κB subunit 1 (NFKB1) p.G686fs mutation and a homozygous inducible T-cell co-stimulator (ICOS) p.L96Sfs mutation. The predicted crystal models indicated premature truncation of the two mutated proteins. Both variants were demonstrated as loss-of-function mutations and were associated with overlapped manifestations of respiratory fungal infection and splenomegaly. We further performed a detailed assessment of immunologic phenotypes and impaired lymphocyte functions in patients. Moreover, we discovered an association between monoclonal T-large granular lymphocyte proliferation and ICOS-deficient CVID for the first time. These observations lead to a new perspective on the underlying genetic heterogeneity of CVID.
19
Bruns, Luzia, Victoria Panagiota, Sandra von Hardenberg, Gunnar Schmidt, Ignatius Ryan Adriawan, Eleni Sogka, Stefanie Hirsch et al. « Common Variable Immunodeficiency-Associated Cancers : The Role of Clinical Phenotypes, Immunological and Genetic Factors ». Frontiers in Immunology 13 (17 février 2022). http://dx.doi.org/10.3389/fimmu.2022.742530.
Texte intégralRésumé :
ObjectiveThe aim of this study was to investigate the prevalence of cancer and associating clinical, immunological, and genetic factors in a German cohort of patients with common variable immunodeficiency (CVID).MethodsIn this retrospective monocenter cohort study, we estimated the standardized incidence ratio (SIR) for different forms of cancer diagnosed in CVID patients. Furthermore, we evaluated the likely association of infectious and non-infectious CVID-related phenotypes with the diagnosis of cancer by calculation of the odds ratio. The genetic background of CVID in patients with cancer was evaluated with sequential targeted next-generation sequencing (tNGS) and whole-exome sequencing (WES). Patients’ family history and WES data were evaluated for genetic predisposition to cancer.ResultsA total of 27/219 patients (12.3%) were diagnosed with at least one type of cancer. Most common types of cancer were gastric cancer (SIR: 16.5), non-melanoma skin cancer (NMSC) (SIR: 12.7), and non-Hodgkin lymphoma (NHL) (SIR: 12.2). Immune dysregulation manifesting as arthritis, atrophic gastritis, or interstitial lung disease (ILD) was associated with the diagnosis of cancer. Furthermore, diagnosis of NMSC associated with the diagnosis of an alternative type of cancer. Studied immunological parameters did not display any significant difference between patients with cancer and those without. tNGS and/or WES yielded a definite or likely genetic diagnosis in 11.1% of CVID patients with cancer. Based on identified variants in cancer-associated genes, the types of diagnosed cancers, and family history data, 14.3% of studied patients may have a likely genetic susceptibility to cancer, falling under a known hereditary cancer syndrome.ConclusionsGastric cancer, NMSC, and NHL are the most frequent CVID-associated types of cancer. Manifestations of immune dysregulation, such as arthritis and ILD, were identified as risk factors of malignancy in CVID, whereas studied immunological parameters or the identification of a monogenic form of CVID appears to have a limited role in the evaluation of cancer risk in CVID.
20
Malik, Aniko, Elizabeth Stringer, Neil Warner, Johan van Limbergen, Anthony Vandersteen, Aleixo Muise et Beata Derfalvi. « Multisystem Autoimmune Inflammatory Disease, Including Colitis, Due to Inborn Error of Immunity ». Pediatrics 148, no 5 (1 novembre 2021). http://dx.doi.org/10.1542/peds.2021-050614.
Texte intégralRésumé :
Our understanding of inflammatory bowel disease is changing as we identify genetic variants associated with immune dysregulation. Inflammatory bowel disease undetermined, even when diagnosed in older children and adolescents, in the setting of multiple inflammatory and infectious diseases should raise the suspicion of complex immune dysregulation with a monogenic basis. We report a case of inflammatory bowel disease undetermined triggered by exposure to a nonsteroidal antiinflammatory drug in a 16-year-old girl with a background history of juvenile idiopathic arthritis, cytopenias, recurrent respiratory tract and middle ear infections, and esophageal candidiasis. Immunologic assessment included measurement of immunoglobulin levels, lymphocyte immunophenotyping, B-cell functional tests, and whole-exome sequencing. Laboratory investigation revealed defects of humoral immunity, including mild persistent hypogammaglobulinemia affecting all 3 isotypes and absent isohemagglutinins. Whole exome sequencing revealed a heterozygous TNFRSF13B (Tumor Necrosis Factor Receptor Superfamily Member 13B, or Transmembrane Activator and Calcium-modulating cyclophilin ligand Interactor, TACI) gene variant, which is associated with common variable immunodeficiency and the development of autoimmune diseases. In conclusion, a clinical history of recurrent infections, atypical histologic features of inflammatory bowel disease, additional autoimmune manifestations, and an inadequate response to conventional therapy should prompt the physician to refer to an immunologist with the query of inborn error of immunity. We report how extensive immune evaluation and genetic diagnosis can individualize care and facilitate a multidisciplinary team approach.
21
Schmidt, Axel, Sophia Peters, Alexej Knaus, Hemmen Sabir, Frauke Hamsen, Carlo Maj, Julia Fazaal et al. « TBK1 and TNFRSF13B mutations and an autoinflammatory disease in a child with lethal COVID-19 ». npj Genomic Medicine 6, no 1 (1 juillet 2021). http://dx.doi.org/10.1038/s41525-021-00220-w.
Texte intégralRésumé :
AbstractAmong children, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections are typically mild. Here, we describe the case of a 3.5-year-old girl with an unusually severe presentation of coronavirus disease (COVID-19). The child had an autoinflammatory disorder of unknown etiology, which had been treated using prednisolone and methotrexate, and her parents were half cousins of Turkish descent. After 5 days of nonspecific viral infection symptoms, tonic-clonic seizures occurred followed by acute cardiac insufficiency, multi-organ insufficiency, and ultimate death. Trio exome sequencing identified a homozygous splice-variant in the gene TBK1, and a homozygous missense variant in the gene TNFRSF13B. Heterozygous deleterious variants in the TBK1 gene have been associated with severe COVID-19, and the variant in the TNFRSF13B gene has been associated with common variable immunodeficiency (CVID). We suggest that the identified variants, the autoinflammatory disorder and its treatment, or a combination of these factors probably predisposed to lethal COVID-19 in the present case.
22
Pernaa, Nora, Salla Keskitalo, Iftekhar Chowdhury, Antti Nissinen, Virpi Glumoff, Riikka Keski-Filppula, Juhani Junttila et al. « Heterozygous premature termination in zinc-finger domain of Krüppel-like factor 2 gene associates with dysregulated immunity ». Frontiers in Immunology 13 (18 novembre 2022). http://dx.doi.org/10.3389/fimmu.2022.819929.
Texte intégralRésumé :
Krüppel-like factor 2 (KLF2) is a transcription factor with significant roles in development, maturation, differentiation, and proliferation of several cell types. In immune cells, KLF2 regulates maturation and trafficking of lymphocytes and monocytes. KLF2 participates in regulation of the nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) pathway. Although pulmonary arterial hypertension (PAH) related to KLF2 genetic variant has been suggested, genetic role of KLF2 associated with immune dysregulation has not been described. We identified a family whose members suffered from lymphopenia, autoimmunity, and malignancy. Whole exome sequencing revealed a KLF2 p.(Glu318Argfs*87) mutation disrupting the highly conserved zinc finger domain. We show a reduced amount of KLF2 protein, defective nuclear localization and altered protein-protein interactome. The phenotypically variable positive cases presented with B and T cell lymphopenia and abnormalities in B and T cell maturation including low naive T cell counts and low CD27+IgD-IgM- switched memory B cells. KLF2 target gene (CD62L) expression was affected. Although the percentage of (CD25+FOXP3+, CD25+CD127-) regulatory T cells (Treg) was high, the naive Treg cells (CD45RA+) were absent. Serum IgG1 levels were low and findings in one case were consistent with common variable immunodeficiency (CVID). Transcription of NF-κβ pathway genes and p65/RelA phosphorylation were not significantly affected. Inflammasome activity, transcription of genes related with JAK/STAT pathway and interferon signature were also comparable to controls. Evidence of PAH was not found. In conclusion, KLF2 variant may be associated with familial immune dysregulation. Although the KLF2 deficient family members in our study suffered from lymphopenia, autoimmunity or malignancy, additional study cohorts are required to confirm our observations.
23
Tafaroji, Javad, Pouya Mahdavi Sharif, Saeed Karimi et Ali Reza Sharifi. « Comparison of Clinical Manifestations, Immunological Analyses Between LRBA and CVID Patients : A Longitudinal Study ». Immunology and Genetics Journal, 18 janvier 2022. http://dx.doi.org/10.18502/igj.v4i1.8393.
Texte intégralRésumé :
Background: Common variable immunodeficiency (CVID), is generally recognized as the most frequent type of Symptomatic primary immunodeficiencies (PID). Mutations in lipopolysaccharideresponsive beige-like anchor protein (LRBA) gene, are the most common genetic alterations amongst CVID patients. To date, there are no published studies to compare clinical and immunologic features of LRBA-deficient patients with those who do not harbor any known genetic mutations. Therefore, this study aims to compare the clinical manifestations and laboratory findings of Iranian patients with LRBA-deficiency and CVID with no known genetic alterations.
Methods: We performed a longitudinal study on patients who had been diagnosed with CVID. Demographic and clinical features were obtained via the databank of the Iranian Registry of Primary Immunodeficiencies, and the direct interviews with patients. To assess the presence of LRBA or other genetic mutations, whole-exome sequencing (WES) was used. Immunologic characteristics of patients were evaluated using flow cytometry, nephelometry, and conventional blood counts. The current study is conducted at Tehran’s Children Medical Center and is approved by the ethics committee of Tehran University of Medical Sciences.
Results: Between March 2013 and October 2019, we enrolled 30 patients with LRBA-deficiency and 13 patients with CVID, who had no identified genetic mutations. Regarding clinical features, there were no significant differences for the prevalence of infections at different sites (lung, sinuses, and middle ear) among the two groups (all P-values > 0.05). However, the incidences of autoimmune disorders and enteropathy were significantly higher among LRBA-deficient cases (P < 0.001). In serum levels of immunoglobulins, there were significant differences for IgG and IgM between the two groups (P-values of 0.014 and 0.004, respectively); however, this was not seen for IgA and IgE levels. Likewise, we did not see any significant differences for the cluster of differentiation (CD) markers between the two groups (all P-values > 0.05).
Conclusion: Compared to the CVID patients with no identified genetic mutations, LRBA-deficient patients have a significantly greater chance of parental consanguinity and developing autoimmune disorders and enteropathy, and have significantly higher values of serum IgG and IgM. The rate of infectious complications and other basic laboratory features, do not show significant differences between the two groups.
24
Frohne, Alexandra, Martin Koenighofer, Hakan Cetin, Michael Nieratschker, David T. Liu, Franco Laccone, Juergen Neesen et al. « A homozygous AP3D1 missense variant in patients with sensorineural hearing loss as the leading manifestation ». Human Genetics, 29 novembre 2022. http://dx.doi.org/10.1007/s00439-022-02506-0.
Texte intégralRésumé :
AbstractLoss-of-function variants in AP3D1 have been linked to Hermansky–Pudlak syndrome (HPS) 10, a severe multisystem disorder characterized by oculocutaneous albinism, immunodeficiency, neurodevelopmental delay, hearing loss (HL), and neurological abnormalities, fatal in early childhood. Here, we report a consanguineous family who presented with presumably isolated autosomal recessive (AR) HL. Whole-exome sequencing was performed on all core family members, and selected patients were screened using array-based copy-number analysis and karyotyping. Candidate variants were validated by Sanger sequencing and assessed in silico. A homozygous, likely pathogenic p.V711I missense variant in AP3D1 segregated with the HL. The family was characterized by thorough medical and laboratory examination. The HL was consistent across patients and accompanied by neurological manifestations in two brothers. The sole female patient was diagnosed with premature ovarian failure. Further findings, including mild neutropenia and reduced NK-cell cytotoxicity in some as well as brain alterations in all homozygous patients, were reminiscent of HPS10, though milder and lacking the characteristic albinism. Previously unrecognized, milder, isolated HL was identified in all heterozygous carriers. A protein model indicates that the variant interferes with protein–protein interactions. These results suggest that a missense variant alters inner-ear-specific functions leading to HL with mild HPS10-like symptoms of variable penetrance. Milder HL in heterozygous carriers may point towards semi-dominant inheritance of this trait. Since all previously reported HPS10 cases were pediatric, it is unknown whether the observed primary ovarian insufficiency recapitulates the subfertility in Ap3d1-deficient mice.
25
Nakano, Tomohiro, Yoji Sasahara, Atsuo Kikuchi, Kunihiko Moriya, Hidetaka Niizuma, Tetsuya Niihori, Matsuyuki Shirota et al. « Novel POLE mutations identified in patients with IMAGE-I syndrome cause aberrant subcellular localisation and protein degradation in the nucleus ». Journal of Medical Genetics, 9 mai 2022, jmedgenet—2021–108300. http://dx.doi.org/10.1136/jmedgenet-2021-108300.
Texte intégralRésumé :
BackgroundDNA replisome is a molecular complex that plays indispensable roles in normal DNA replication. IMAGE-I syndrome is a DNA replisome-associated genetic disease caused by biallelic mutations in the gene encoding DNA polymerase epsilon catalytic subunit 1 (POLE). However, the underlying molecular mechanisms remain largely unresolved.MethodsThe clinical manifestations in two patients with IMAGE-I syndrome were characterised. Whole-exome sequencing was performed and altered mRNA splicing and protein levels of POLE were determined. Subcellular localisation, cell cycle analysis and DNA replication stress were assessed using fibroblasts and peripheral blood from the patients and transfected cell lines to determine the functional significance of POLE mutations.ResultsBoth patients presented with growth retardation, adrenal insufficiency, immunodeficiency and complicated diffuse large B-cell lymphoma. We identified three novel POLE mutations: namely, a deep intronic mutation, c.1226+234G>A, common in both patients, and missense (c.2593T>G) and in-frame deletion (c.711_713del) mutations in each patient. The unique deep intronic mutation produced aberrantly spliced mRNAs. All mutants showed significantly reduced, but not null, protein levels. Notably, the mutants showed severely diminished nuclear localisation, which was rescued by proteasome inhibitor treatment. Functional analysis revealed impairment of cell cycle progression and increase in the expression of phospho-H2A histone family member X in both patients.ConclusionThese findings provide new insights regarding the mechanism via which POLE mutants are highly susceptible to proteasome-dependent degradation in the nucleus, resulting in impaired DNA replication and cell cycle progression, a characteristic of DNA replisome-associated diseases.
26
Tofighi Zavareh, Farzaneh, Yasser Bagheri et Abbas Ali Keshtkar. « Evaluation of B cell and T cell Phenotypes in CVID Patients and its Correlation with the Clinical Phenotypes : Study Protocol ». Immunology and Genetics Journal, 13 octobre 2021. http://dx.doi.org/10.18502/igj.v3i4.7464.
Texte intégralRésumé :
Background: Common variable immunodeficiency (CVID) is the most frequent symptomatic primary immunodeficiency, which manifests a wide range of clinical phenotypes from recurrent infections of the respiratory system to autoimmunity, enteropathy and lymphoproliferative disorders. Some abnormalities in T and B lymphocyte subpopulations may associate with the development of such clinical complications.
Aim of study: The main objective of this case-control study is to investigate the frequency and absolute count of different lymphocyte subsets in CVID patients as well as the cellular proliferation response. Correlation between lymphocyte abnormalities and different clinical phenotypes of the disease such as infection only (IO), autoimmunity (AI), chronic enteropathy (CE) and lymphoproliferative disorders (LP) are determined. We also aim to evaluate the prognosis of CVID for each clinical manifestation based on lymphocyte phenotype.
Methods: A population of genetically unsolved CVID patients after whole exome sequencing (WES) will be subdivided into 4 clinical phenotypes i.e. IO, AI, CE and LP and an equal number of age and sex-matched healthy controls (HC) will be examined for the frequency of distinct subgroups of CD19+ B cells, CD4+ T cells and CD8+ T cells by flow cytometry. The proliferation response of their CD4+ T cells is then evaluated by Carboxyfluorescein succinimidyl ester (CFSE) test, using stimulation of isolated peripheral blood mononuclear cells with anti-CD3 and anti-CD28 antibodies. Data analysis will be assessed by parametric or nonparametric tests based on normality of data distribution using IBM SPSS Statistics, V.24 and Stata software V.14.
Ethics and dissemination: Ethical approval of this study is received from the Ethics Committee of Tehran University of Medical Sciences (ID number: IR.TUMS.VCR.REC.1396.3380) and all participants will be asked to sign the informed consent statement. Due to the wide range of variables, objectives and questions, the findings of this study are intended to release as multiple publications in peer-reviewed journals and presented at national and international conferences.
27
Li, Niu, Yufei Xu, Yi Zhang, Guoqiang Li, Tingting Yu, Ruen Yao, YunFang Zhou et al. « Biallelic ERBB3 loss-of-function variants are associated with a novel multisystem syndrome without congenital contracture ». Orphanet Journal of Rare Diseases 14, no 1 (21 novembre 2019). http://dx.doi.org/10.1186/s13023-019-1241-z.
Texte intégralRésumé :
Abstract Background Gain-of-function pathogenic variants of the Erb-B2 receptor tyrosine kinase 3 (ERBB3) gene contribute to the occurrence and development of a variety of human carcinomas through activation of phosphatidylinositol 3-kinase (PI3K)/AKT and extracellular signal-regulated kinase (ERK) signaling. ERBB3 gene homozygous germline variants, whose loss of function may cause autosomal recessive congenital contractural syndrome, were recently identified. This study aims to identify the disease-causing gene in a Chinese pedigree with variable phenotypes involving multiple systems, including developmental delay, postnatal growth retardation, transient lower limb asymmetry, facial malformations, atrioventricular canal malformation, bilateral nystagmus and amblyopia, feeding difficulties, immunodeficiency, anemia, and liver damage, but without congenital contracture. Methods Trio-whole exome sequencing (WES) was performed to identify the disease-causing gene in a 24-month-old Chinese female patient. The pathogenicity of the identified variants was evaluated using in silico tools and in vitro functional studies. Results Trio-WES revealed compound heterozygous variants of c.1253 T > C (p.I418T) and c.3182dupA (p.N1061Kfs*16) in the ERBB3 gene. Functional studies showed that p.I418T resulted in normal expression of ERBB3, which was capable of interacting with ERBB2. However, the variant impaired ERBB3 phosphorylation, consequently blocking ERBB2 phosphorylation and AKT and ERK activation. The truncated protein resulting from the c.3182dupA variant also lacked the capacity to activate downstream signaling pathways. Conclusions We report the first patient with a novel multisystem syndrome disorder without congenital contracture resulting from biallelic loss-of-function variants of ERBB3.
28
Luterbacher, Fanny, Fanette Bernard, Frédéric Baleydier, Emmanuelle Ranza, Peter Jandus et Geraldine Blanchard-Rohner. « Case Report : Persistent Hypogammaglobulinemia More Than 10 Years After Rituximab Given Post-HSCT ». Frontiers in Immunology 12 (22 décembre 2021). http://dx.doi.org/10.3389/fimmu.2021.773853.
Texte intégralRésumé :
Rituximab (RTX) is an anti-CD20 monoclonal antibody that targets B cells—from the immature pre-B-cell stage in the bone marrow to mature circulating B cells—while preserving stem cells and plasma cells. It is used to treat autoimmune diseases, hematological malignancies, or complications after hematopoietic stem cell transplantation (HSCT). Its safety profile is acceptable; however, a subset of patients can develop persistent hypogammaglobulinemia and associated severe complications, especially in pediatric populations. We report the unrelated cases of two young men aged 17 and 22, presenting with persistent hypogammaglobulinemia more than 7 and 10 years after treatment with RTX, respectively, and administered after HSCT for hemolytic anemia and Epstein–Barr virus reactivation, respectively. Both patients’ immunological workups showed low levels of total immunoglobulin, vaccine antibodies, and class switched-memory B cells but an increase in naive B cells, which can also be observed in primary immunodeficiencies such as those making up common variable immunodeficiency. Whole exome sequencing for one of the patients failed to detect a pathogenic variant causing a Mendelian immunological disorder. Annual assessments involving interruption of immunoglobulin replacement therapy each summer failed to demonstrate the recovery of endogenous immunoglobulin production or normal numbers of class switched-memory B cells 7 and 10 years after the patients’ respective treatments with RTX. Although the factors that may lead to prolonged hypogammaglobulinemia after rituximab treatment (if necessary) remain unclear, a comprehensive immunological workup before treatment and long-term follow-up are mandatory to assess long-term complications, especially in children.