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Characterization of the genetic architecture of neurodevelopmental disorders using Duchenne Muscular Dystrophy as a model

Grant number: 19/19521-7
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): May 01, 2020
Effective date (End): April 30, 2023
Field of knowledge:Biological Sciences - Genetics - Human and Medical Genetics
Principal Investigator:Maria Rita dos Santos e Passos Bueno
Grantee:Claudia Ismania Samogy Costa
Host Institution: Instituto de Biociências (IB). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Duchenne Muscular Dystrophy (DMD) is a progressive neuromuscular disease caused by loss of function mutations in the DMD gene. In addition to the muscle phenotype, about 30% of patients manifest different Neurodevelopmental Diseases (NDDs), which occur 15-30 times more often than in the general population. Although loss of function of the smaller isoforms of DMD (Dp140 and Dp71) partly explain the increased risk for intellectual disability, the molecular mechanisms associated with the manifestation of different NDDs, such as autism, and intellectual disability itself in patients with DMD are not yet fully understood. Different studies have shown the relevance of rare variants of moderate effect in the genetic background for the manifestation and variability of NDDs, compatible with an oligogenic inheritance model. Thus, the objective of this project is to verify if mutations in DMD associated with an accumulation of rare variants of moderate effect on neurodevelopmental genes are responsible for the development of different NDD in DMD patients. To this end, the exome of 100 patients diagnosed with DMD (half of them with NDD and half not) will be sequenced and analyzed for the number of potentially pathogenic variants in known or candidate neurodevelopmental genes. The data found in both subgroups will then be analyzed to determine if there is an enrichment of potentially pathogenic variants in neurodevelopmental genes in patients with DMD associated with NDD. Functional studies will be designed to evaluate the effect of combining the variant in DMD with other variants in genes selected in the genomic study. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
SAMOGY COSTA, CLAUDIA ISMANIA; DA SILVA MONTENEGRO, EDUARDA MORGANA; ZARREI, MEHDI; MOREIRA, ELOISA DE SA; WAHYS SILVA, ISABELA MAYA; SCLIAR, MARILIA DE OLIVEIRA; WANG, JAQUELINE YU TING; ZACHI, ELAINE CRISTINA; BRANCO, ELISA VARELLA; DA COSTA, SILVIA SOUZA; et al. Copy number variations in a Brazilian cohort with autism spectrum disorders highlight the contribution of cell adhesion genes. Clinical Genetics, v. 101, n. 1, . (13/08028-1, 19/19521-7)

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