Rett syndrome and long-term disorder profile

Area of Science:

• Genetics
• Neurology
• Pediatrics

Background:

• Rett syndrome (RTT) is a rare genetic neurodevelopmental disorder.
• Mutations in the MECP2 gene are the primary cause of RTT.
• Understanding genotype-phenotype correlations is crucial for RTT management.

Purpose of the Study:

• To investigate the natural history of Rett syndrome based on MECP2 mutation status.
• To develop detailed disorder profiles for different MECP2 mutations.
• To identify specific MECP2 mutations associated with distinct clinical presentations and long-term outcomes.

Main Methods:

• Retrospective analysis of a cohort of 103 females with clinically diagnosed RTT.
• Detailed documentation of natural history and clinical features.
• Grouping patients based on specific MECP2 mutations and intragenic deletions.

Main Results:

• A high prevalence of detectable MECP2 mutations (91/103) was observed in the RTT cohort.
• Distinct disorder profiles emerged, correlating specific MECP2 mutations with varied developmental trajectories.
• Mutations R133C, R306C, and C-terminal deletions were associated with milder, long-term development.
• The T158M mutation presented with atypical, predominantly behavioral features early on, evolving into classic RTT later.

Conclusions:

• Genotype-specific analysis of natural history provides valuable insights into RTT heterogeneity.
• Specific MECP2 mutations, such as R133C, R306C, C-terminal deletions, and T158M, are associated with unique clinical courses.
• Further research on these specific mutation groups is warranted to refine understanding and therapeutic approaches for Rett syndrome.