View clinical trials related to Genetic Diseases, Inborn.
Filter by:Congenital malformations concern 3% of pregnancies; most of them can be seen during pregnancy. For some malformations, an invasive sample (trophoblast biopsy or amniocentesis) is proposed to search a chromosomal abnormality by the technique of DNA chip. However, some strongly suggestive signs of a genetic (and not chromosomal) pathology have a very low diagnostic rate with this technique. In the absence of an etiological diagnosis, the prognosis for the unborn child is very difficult to assess, as we can't know if the fetal malformation is really isolated or associted to other unseen features as part of a syndromic condition. For some malformations strongly suggestive of a genetic condition, we propose to realize an exome (i.e. all coding parts of the genome) sequencing of the trio (child and the 2 parents) with a delivery time compatible with the emergency situation of a pregnancy (6 weeks maximum). We will apply bioinformatics filters to analyse only genes known to be involved in the malformation present in the unborn child and thus avoid the identification of variants in unrelated genes. These lists of genes have been previously validated by the Rare Disease Health Sectors and the affiliated diagnostic laboratories. The selected malformations are: 1) anomalies of the central nervous system (microcephaly (<- 2DS) with anomalies of gyration, anomalies of the posterior fossa, anomalies of the midline except agenesis of the corpus callosum), 2) ophthalmological anomalies (microphthalmia, hyperplasia vitreous) and 3) renal abnormalities (large hyperechoic kidneys).
Amniocentesis (amnio) and chorionic villus sampling (CVS) can reliably detect many smaller DNA/genetic abnormalities that cannot be reliably diagnosed by cell-free noninvasive prenatal testing (NIPT) that is in widespread use. The investigators present evidence that a cell-based form of NIPT, here called Single Fetal Cell (SFC) testing, using a blood sample from the mother can detect most or all of the genetic abnormalities that are detected using amnio or CVS. This study proposes to compare the effectiveness of SFC testing in detecting abnormalities already detected by amnio or CVS in women already undergoing these tests as part of their clinical care because of fetal ultrasound abnormalities.
Due to the widespread use of NGS, TTN is emerging as a major causative gene in neuromuscular disorders, with high clinical heterogeneity. The mechanisms underlying the phenotypic variability and mode of inheritance (recessive or dominant) of titinopathies are poorly understood. They involve the primordial structural functions of titin on the formation and stability of the sarcomere, as well as its interactions with other proteins. We identified by NGS, in patients with skeletal myopathy (with or without cardiomyopathy), several potentially disease causing TTN variants. The specific aims of the present project are to implement functional studies (transcripts, protein analyses, in vitro protein-protein interaction studies) to evaluate the effect of TTN variants on the transcripts and protein in order to perform phenotype-genotype correlation studies. We participate to the national "titin network" and to international efforts for the understanding of the molecular bases of titinopathies. Genomic characterisation opens the way to develop cellular models of titinopathy, derived from patient biopsies. This is also a mandatory first step for the design of novel therapeutic approaches.
The main objective of this study is to apply a well-established model of developmental surveillance (which evolved to characterize the outcomes of very low birth weight infants) to infants with genetic disorders. A novel clinical model for infants with rare genetic disorders has been created as a joint initiative between the Division of Newborn Medicine's NICU Growth and Developmental Support Programs (NICU GraDS) program and the Division of Genetics at Boston Children's Hospital (BCH). This study plans to enroll patients with genetic syndromes seen in this clinic into a prospective, longitudinal study in order to characterize their developmental profiles and needs.
The project will carry out the genetic testing of 100000 neonates in the next 5 years. The aim of the project is to construct the Chinese neonatal genome database, establish the genetic testing standard of neonatal genetic diseases, and promote the industrialization of neonatal genetic disease gene testing, improve the training system for genetic counseling.
Brief Summary: Nonimmune hydrops fetalis (NIHF) is a potentially fatal condition characterized by abnormal fluid accumulation in two or more fetal compartments. Numerous etiologies may lead to NIHF, and the underlying cause often remains unclear (1). The current standard of genetic diagnostic testing includes a fetal karyotype and chromosomal microarray (CMA), with an option to pursue single gene testing on amniocytes collected by amniocentesis (2). A large subgroup of the NIHF causes includes single gene disorders that are not diagnosed with the standard genetic workup for hydrops. Currently, nearly 1 in 5 cases of NIHF is defined as idiopathic, meaning there is no identified etiology (2). The investigators believe this is because the causes of NIHF are not completely investigated, specifically single gene disorders. Our research study aims to increase the diagnostic yield by performing whole exome sequencing (WES) and whole genome sequencing (WGS) on prenatal and neonatal NIHF cases when standard genetic testing is negative, identifying known and new genes, thus providing vital information to families regarding the specific diagnosis and risk to future pregnancies. The investigators plan to perform WES as the initial diagnostic test. If WES is negative, then the investigators will proceed to perform WGS.
Phenotypic characterisation of MVP by echocardiography in families. Identification of genes involved in MVP.
The goal of the study is to develop a method of genetic diagnosis in two stages, by mendelioma then by genome and transcriptome on fibroblast culture, in genodermatoses and rare diseases with cutaneous expression in the child.
This study is a controlled trial of metformin in individuals with fragile X syndrome between the ages of 6 and 35 years. Participants will be randomized in a double-blind design to either drug or placebo and will attend three visits to the study site in a 4-month period for a series of tests. The primary objectives are to assess safety, tolerability, and efficacy of metformin in the treatment of language deficits, behavior problems, and obesity/excessive appetite in individuals with fragile X syndrome.
The aim of this study is to evaluate performances of a NIPT test based onto the study of the maternal blood to search known genetic mutations already detected in the family and potentially inherited by the fetus. This test will avoid an invasive prenatal diagnosis in those families with a known genetic risk. The performance of this test will be evaluated in terms of sensitivity and specificity with an adapted statistic model. Secondary objectives of the protocol are - To adapt NIPT to small DNA quantity (5-50 ng) - To adapt bioinformatics pipeline to low rate of mosaicism - To develop a tool to quantify the fetal fraction - To evaluate the robustness of the method This test is based onto capture and high throw put sequencing adapted to cell free plasmatic DNA of pregnant women in order to detect point mutation present in her fetus. This approach has been previously described for others clinical applications such as liquid biopsy in cancers but not for NIPT analysis.