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Rett syndrome is caused by mutations in X-linked MECP2, encoding methyl-CpG-binding protein 2
R E Amir1, I B Van den Veyver, M Wan
1Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030, USA.
Nature Genetics
|October 3, 1999
Summary
Mutations in the MECP2 gene cause Rett syndrome (RTT), a neurodevelopmental disorder affecting females. This study identified the first disease-causing mutations, revealing abnormal epigenetic regulation in RTT pathogenesis.
Area of Science:
- Genetics
- Neuroscience
- Epigenetics
Background:
- Rett syndrome (RTT) is a progressive neurodevelopmental disorder affecting females, characterized by loss of skills and neurological deficits.
- RTT is a leading cause of intellectual disability in females, with an incidence of 1 in 10,000-15,000.
- Previous studies localized the RTT locus to Xq28, suggesting an X-linked dominant inheritance pattern.
Purpose of the Study:
- To identify the genetic cause of Rett syndrome (RTT).
- To investigate the role of the MECP2 gene in RTT pathogenesis.
- To explore the underlying epigenetic mechanisms contributing to RTT.
Main Methods:
- Systematic gene screening of patients with Rett syndrome (RTT).
- Mutation analysis of the MECP2 gene, encoding methyl-CpG-binding protein 2.
- Segregation analysis in RTT families and investigation of germline mosaicism.
Main Results:
- Mutations in the MECP2 gene were identified as the cause of RTT in some patients.
- Identified de novo missense, frameshift, and nonsense mutations in MECP2, affecting critical functional domains.
- Evidence of germline mosaicism for an MECP2 mutation in an RTT family was observed.
Conclusions:
- The study reports the first disease-causing mutations for Rett syndrome (RTT).
- Mutations in MECP2 are linked to the pathogenesis of RTT.
- Abnormal epigenetic regulation mediated by MECP2 is implicated in RTT development.