Literatura científica selecionada sobre o tema "Trisomie 21 – Génétique"
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Artigos de revistas sobre o assunto "Trisomie 21 – Génétique"
Ravel, Aimé. "Génétique, diagnostic et caractéristiques de la trisomie 21". Soins Pédiatrie/Puériculture 39, n.º 302 (maio de 2018): 10–14. http://dx.doi.org/10.1016/j.spp.2018.03.002.
Texto completo da fonteFerretti, Emanuela. "Doctor Jérôme Lejeune’s Gaze at the University of Ottawa". University of Ottawa Journal of Medicine 6, n.º 1 (11 de maio de 2016): 58–62. http://dx.doi.org/10.18192/uojm.v6i1.1590.
Texto completo da fonteMartel-Billard, C., C. Cordier, C. Tomasetto, J. Jégu e C. Mathelin. "Cancer du sein et trisomie 21 : une anomalie génétique qui protège contre le cancer du sein ?" Gynécologie Obstétrique & Fertilité 44, n.º 4 (abril de 2016): 211–17. http://dx.doi.org/10.1016/j.gyobfe.2016.02.016.
Texto completo da fonteGouas, Laetitia, Patrick Callier, Nora Chelloug, Henri Copin, Cédric Le Caignec, Martine Doco-Fenzy, Paul Kuentz et al. "« Test ADNlc T21 » ou test génétique non invasif de dépistage de la trisomie 21 fœtale : à propos d’un consortium d’utilisateurs". Morphologie 102, n.º 338 (setembro de 2018): 140–41. http://dx.doi.org/10.1016/j.morpho.2018.07.124.
Texto completo da fonteGouas, Laetitia, Eléonore Eymard-Pierre, Gaëlle Salaun, Céline Pebrel-Richard, Carole Goumy e Philippe Vago. "Test génétique non invasif de dépistage de la trisomie 21 fœtale (TGNI T21) : retour d’expérience après une année de pratique au CHU de Clermont-Ferrand". Morphologie 101, n.º 335 (dezembro de 2017): 248. http://dx.doi.org/10.1016/j.morpho.2017.07.023.
Texto completo da fonteBenachi, A., e Jean-Marc Costa. "Réflexions autour des tests génétiques non invasifs pour la détection de la trisomie 21 fœtale". La Revue Sage-Femme 13, n.º 2 (abril de 2014): 45–48. http://dx.doi.org/10.1016/j.sagf.2014.03.002.
Texto completo da fonteBenachi, Alexandra, e Jean-Marc Costa. "Réflexions autour des tests génétiques non invasifs pour la détection de la trisomie 21 fœtale". Journal de Gynécologie Obstétrique et Biologie de la Reproduction 43, n.º 3 (março de 2014): 195–97. http://dx.doi.org/10.1016/j.jgyn.2013.12.012.
Texto completo da fonte"First person – Arnaud Duchon". Disease Models & Mechanisms 15, n.º 12 (1 de dezembro de 2022). http://dx.doi.org/10.1242/dmm.049964.
Texto completo da fonteTeses / dissertações sobre o assunto "Trisomie 21 – Génétique"
Haquet, Emmanuelle. "Recombinaison entre chromosomes non-disjoints dans la Trisomie 21 et correlations génotypes/phénotypes dans le syndrome de Down". Montpellier 2, 2006. http://www.theses.fr/2006MON20070.
Texto completo da fonteDown syndrome (DS), which is mainly caused by trisomy 21, is characterized by many abnormalities affecting most organ systems. The majority of DS features are highly variable between patients in term of presence and severity. Nucleotidic variations (SNPs) within or around some triplicated genes could be partly responsible for this variability. On another hand, fine scale analysis of recombination in the sub-telomeric region should make it more precise the relationship previously reported between altered recombination and meiotic non-disjunction. We addressed these two questions by typing a hundred of SNPs along chromosome 21 in families with a trisomic child. Two set of 50 SNPs have been designed, one for each project. The first 50 SNPs set covers 2 megabases of the Down Syndrome Critical Region (21q22. 13-q22. 2). We have genotyped 81 patients and studied, for each SNP, the proportion of genotypes between patients with and without a DS trait (including mental retardation and cardiac malformation). We have observed two associations, one strong (p<0,001) and one weaker (p<0,05), between two intragenic SNPs and the presence of a septal cardiac defect. The concerned gene is KCNJ6 a potassium channel which potential implication in DS cardiopathy is a new way of investigations for understanding the variability of this DS trait. The second 50 SNPs set covers the 7. 9 sub-telomeric mégabases of chromosome 21. We could not observe significant differences between recombination distributions in context of normal and non-disjoined chromosomes. Nevertheless, the presence of a unique recombination event in a 2 Mb region, located at 2 Mb from the telomere, seems to be critical for the generation of non-disjoined chromosome 21
Graison, Aït Yahya Emilie. "Etude des processus de dérégulations géniques apparaissant dans la trisomie 21". Paris 7, 2008. http://www.theses.fr/2008PA077025.
Texto completo da fonteDown syndrome is the most common genetic disease and is characterized by numerous and highly variable clinical features. In order to determine the involvement of triplicated genes in the pathogenesis of the Down syndrome phenotypes, we analyzed chromosome 21 gene expression variations under the effect of the disease in lymphoblastoid cell lines from trisomic patients and control individuals. For this purpose, we designed an oligonucleotide microarray dedicated to the whole content of chromosome 21 containing 359 genes, predictions and antisense transcripts. We established a classification of chromosome 21 genes and predictions according to their expression variations in Down syndrome in our cellular model. Overexpressed genes are likely to be involved in Down syndrome phenotypes whereas the majority of genes which are compensated are not. Highly variable genes could rather be involved in the phenotypic variability between patients. In 40% to 60% of cases, trisomic patients show congenital heart defects. To go further in the identification of genes implicated in the pathogenesis of heart defect in Down syndrome, we compared the transcriptome of lymphoblastoid cell lines from patients with cardiac abnormalities to those of cell lines from patients without any heart defect using pangenomic microarrays representing more than 48000 human transcripts. Data analysis reveals that 82 transcripts are differentially expressed between patients with and without cardiac malformations
Mouton-Liger, François. "Fonction, régulation de PCP4 et trisomie 21 : analyse de modèles murins de surexpression". Paris 7, 2008. http://www.theses.fr/2008PA077062.
Texto completo da fontePcp4/pepl9 is a modulator of Ca2+-CaM, a key molecule for calcium signaling, expressed in postmitotic neuroectoderm cells during mouse embryogenesis. PCP4 gene is located on human chromosome 21, and present in three copies in Down syndrome (DS). To evaluate the consequences of 3 copies of this gene on the development of these cells in the nervous System, we constructed a transgenic (TgPCP4) mouse model, with one copy of human PCP4, and investigated the effects in this model. We showed that pcp4 overexpression is present at transcript and protein levels, and overexpression induced precocious neuronal differentiation, as shown by the distribution and levels of early neuronal markers. We also demonstrated that pcp4 overexpression was associated with an increase in CaMKIIdelta activation, TgPCP4 and TslCje, a mouse model of DS, developed similar modifications, demonstrating that these mechanisms may account for abnormal neuronal development in DS
Fillon-Emery, Nathalie. "Implications des folates et/ou cobalamines dans la survenue et la pathologie de la trisomie 21". Nancy 1, 2003. http://www.theses.fr/2003NAN10187.
Texto completo da fonteTrisomy 21 is the most common genetic cause of human mental retardation. It determines a characteristic syndrome: Down syndrome, associating mental deficiency, malformations and neurological signs characteristic of Alzheimer disease. However these disorders are also observed in the event of deficiency in folates and cobalamines. These two vitamins play a capital part in the processes of methylation, the synthesis of ADN and the development of the foetus. Moreover, two genes of the cycle of the folates are localised on chromosome 21: CBS and RFC. Our assumption is thus the following one: DS could be du to hypomethylation caused by a deficit of the enzymes implied in the one carbon metabolism (MTHFR, MTR, MTRR, CBS and RFC). Moreover, hypomethylation leads to the nondisjunction of the chromosomes during meiosis so their probable role in occurred of trisomy 21. We thus studied, the impact of these 2 vitamins in occurred and pathology related to Ts21 by the study of various polymorphisms of implied genes and by measuring biochemical factors (Homocystéine, B9, B12). Moreover, we studied, in vitro, on trisomic fibroblasts of patients in culture, the state of methylation according to the senescence and quantified the form of the folates carrier (RFC and FR)
Nguyen, Thu-Lan. "Correction des déficits cognitifs chez des modèles murins de trisomie 21 par un inhibiteur de la kinase DYRK1A : étude pharmacologique et mécanistique". Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAJ124/document.
Texto completo da fonteDown Syndrome (DS), is due to the presence of an extra copy of chromosome 21 (Ch21). Among the candidates implicated in DS intellectual disabilities, DYRK1A is one of the most relevant. Several studies have shown a correlation between an increase of its kinase activity and the intellectual defects observed in DS models. In order to understand the mechanisms underlying the impact of DYRK1A overdosage on cognitive alterations, we used several trisomic mouse models expressing DYRK1A alone or with additional Hsa21 orthologous genes and specific DYRK1A inhibitors (Leucettines) from ManRos Therapeutics. We will present here the consequence of the Leucettines treatment following repetitive administration to several DS mouse models on the behavior and cognition. Further analysis of the phosphoproteome of DS mouse models treated or not with one of the Leucettine, the L41, unravels a few targets and pathways which are involved in the cognitive alterations observed in these trisomic mice. These results support the potential of more selective DYRK1A inhibitor as a therapeutic approach to improve cognitive functions in DS patients
Ahumada, Saavedra José Tomás. "Craniofacial analysis of Down syndrome rodent models". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAJ041.
Texto completo da fonteThe most frequent and distinctive alterations found in Down syndrome (DS) are learning disability and craniofacial (CF) dysmorphism. The CF phenotype includes reduced head dimensions, brachycephaly, reduced mediolateral orbital region, reduced bizygomatic breadth, small maxilla, small mandible, and increased individual variability. Until now, the cellular and molecular mechanisms underlying this CF phenotype remain unknown. This thesis, using a new panel of rats and mice models proposed new candidate genes for the DS-CF phenotype. We confirmed the role of Dyrk1a in neurocranium brachycephaly and identified the overdosage of the transcription factor Ripply3 for midface shortening through the downregulation of Tbx1, another transcription factor involved in similar phenotypes was found in Di George Syndrome. We defined new dosage-sensitive genes responsible for DS-CF malformations, and new models were proposed to rescue the DS-CF phenotype. This new knowledge may also lead to insights for specific brain and cardiovascular phenotypes observed in Tbx1 mutants and DS models
Agbadje, Titilayo. "Développement d'un plan d'intervention afin de promouvoir l'utilisation d'un outil d'aide à la décision par les femmes enceintes dans le contexte du dépistage prénatal de la trisomie 21". Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/30192.
Texto completo da fonteDeciding whether or not to take the Down syndrome screening is a difficult decision for pregnant women. We aimed to develop an intervention plan for pregnant women to promote their use of a patient decision aid when they are making the decision about Down syndrome prenatal screening. We conducted three focus groups with 15 pregnant women to evaluate behaviour change techniques, as described in the Behaviour Change Wheel that would be appropriate for developing the intervention plan to promote the use of the decision aid by pregnant women. The ten techniques retained were: goal setting (behaviour and result), problem solving, action plan, social support (general and practical), adding objects to the environment, prompts/cues, credible sources and demonstration of the behaviour. We then developed an intervention plan using these behaviour change techniques and the clinical pathway of pregnant women in prenatal services.
Leiva, Portocarrero Maria Esther. "Identification des croyances saillantes des femmes enceintes sur l'utilisation d'un outil d'aide à la décision dans le contexte du dépistage prénatal de la trisomie 21 pour l'élaboration et validation d'un questionnaire". Master's thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27801.
Texto completo da fonteThe goal of this exploratory mixed-methods sequential study was to develop a questionnaire to estimate the influence of psychosocial factors on pregnant women’s intention to use a decision aid (DA) in the context of prenatal screening for Down syndrome (T21). First, 46 pregnant women completed semi-structured interviews that were guided by the Theoretical Domains Framework. Fifty-four salient beliefs were identified matching the nine relevant theoretical domains (out of 12). The three most frequent beliefs were “The most important person who would encourage me to use the DA would be my partner”; “The document should be presented and explained by a healthcare professional”, and “Not knowing about DAs influences its use.” These results informed the development of a self-administered questionnaire whose internal consistency and stability over time were assessed as adequate using a test-retest with a second group of 41 pregnant women. This questionnaire will be used to conduct a population based survey for developing a program to implement the DA.
Miry, Claire. "Aspects pratiques et enjeux éthiques du dépistage prénatal non invasif de la trisomie 21 : mise au point et enquête auprès de professionnels de santé et de patientes". Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM5030.
Texto completo da fonteThe place of Non Invasive Prenatal Testing(NIPT) is not clearly established for prenatal screening for Down syndrome in France. Our objectives were to assess the understanding, knowledge of, and attitudes towards NIPT in French patients and healthcare providers.A prospective multicenter study was performed in several French hospital centers between February 2014 and July 2015. A survey was administered to pregnant patients and to healthcare professionals.A total of 260 questionnaires were completed by healthcare providers. The average knowledge score was 5,38±2,83(out of a possible 10). In multivariate analysis, the characteristics associated with satisfactory knowledge were: profession as obstetrician or genetic counsellor, age<30 years, working in hospital or in doctor’s office, more than 50 pregnancies followed per year. Among professionals, 92,7%n=241) had a favorable attitude towards NIPT.We collected 380 questionnaires from pregnant women. The average knowledge score was very low: 2,20±1,88(out of 10). In multivariate analysis, the two significant characteristics associated with satisfactory knowledge was maternal age and having prenatal care in private practice. Among patients, 89,9%(n=328) had a favorable attitude towards NIPT.The level of knowledge of NIPT of healthcare professionals and patients is low. Many patients can not provide informed consent. However most professionals and patients are in favor of the use of this test. The input of NIPT in prenatal screening for trisomy 21 requires a considerable teaching program for healthcare providers so they can give balanced pretest information and non-directive counselling
Delanoë, Agathe. "Influence des facteurs sociocognitifs et de la littératie en santé sur l'intention des femmes enceintes d'utiliser un outil d'aide à la décision dans le contexte du dépistage prénatal de la trisomie 21". Master's thesis, Université Laval, 2017. http://hdl.handle.net/20.500.11794/27642.
Texto completo da fontePregnant women face a choice about whether or not to have a prenatal test for Trisomy 21 (T21) or Down syndrome. This choice is difficult as it involves risk, possible loss or regret, and challenges to personal values. Using decision aids (DA) could help pregnant women make evidence-based decisions aligned with their values and preferences. However, in spite of their advantages, DA are not used systematically in prenatal care. The goal of this study was therefore to identify the psychosocial and health literacy variables that influence pregnant women’s intentions to use a DA for deciding about prenatal T21 testing. For this quantitative cross-sectional descriptive study, we surveyed 350 pregnant women in the province of Quebec (Canada) using a web panel. The women completed a self-administered questionnaire based on an expanded version of the Theory of Planned Behaviour evaluating seven psychosocial constructs (intention, attitude, anticipated regret, subjective norm, descriptive norm, moral norm and perceived control) and four health literacy variables. The survey also collected sociodemographic data. We performed descriptive, bivariate and multivariate analyses. In order of importance, factors identified as determining pregnant women’s intention to use a DA were: attitude (odds ratio/OR 9.16; 95% confidence interval/CI 4.02–20.85), moral norm (OR 7.97, 95% CI 4.49–14.14), descriptive norm (OR 2.83; 95% CI 1.63–4.92) and anticipated regret (OR 2.43; 95%CI 1.71–3.46). Health literacy showed no significant effect (P values range: 0.43-0.92) on pregnant women’s intention to use a DA. These conclusions could inform the design of an intervention that takes these determining factors into account.
Livros sobre o assunto "Trisomie 21 – Génétique"
J, Epstein Charles, Nadel Lynn e National Down Syndrome Society (U.S.), eds. Down syndrome and Alzheimer disease: Proceedings of the National Down Syndrome Society Conference on Down Syndrome and Alzheimer Disease, held in New York, January 16 and 17, 1992. New York: Wiley-Liss, 1992.
Encontre o texto completo da fonteLa réhabilitation des personnes porteuses d'une trisomie 21 - Suivi médical, neuropsychologie, pharmacothérapie et thérapie génétique. Paris: Editions L'Harmattan, 2013.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Trisomie 21 – Génétique"
Barraqué, Marie. "Pathologies du développement d’origine génétique : Trisomie 21 et prise en soin psychomotrice". In Manuel d'enseignement de psychomotricité, 418–37. De Boeck Supérieur, 2018. http://dx.doi.org/10.3917/dbu.albar.2017.01.0418.
Texto completo da fonte