Neurophysiology versus clinical genetics in Rett syndrome: A multicenter study
Nicky Halbach1, Eric E Smeets1, Peter Julu2,3
1Netherlands Rett Expertise Center-GKC, Maastricht University Medical Center, Maastricht, The Netherlands.
American Journal of Medical Genetics. Part A
|June 30, 2016
Summary
This study links Rett syndrome (RTT) genotypes to cardiorespiratory data, finding specific mutations correlate with milder phenotypes. Autonomic disturbances are common across all RTT genotypes, informing patient care.
Area of Science:
- Neurology
- Genetics
- Cardiology
Background:
- Rett syndrome (RTT) genotype-phenotype correlations are complex.
- Cardiorespiratory measurements offer objective data for clinical phenotype correlation.
- Understanding these links is crucial for RTT management and treatment.
Purpose of the Study:
- To correlate RTT genotypes with quantitative cardiorespiratory data.
- To combine neurophysiological measurements with clinical severity scores.
- To investigate genotype-phenotype relationships in RTT.
Main Methods:
- International multicenter study (1999-2012) with 132 RTT females (2-43 years).
- Utilized consensus criteria for RTT diagnosis and molecular confirmation.
- Performed genotype-phenotype analysis on clinical features and cardiorespiratory data, grouping mutations by effect on MeCP2 protein.
Main Results:
- Females with CTS, p.R133C, and p.R294X mutations exhibited a less severe phenotype.
- Autonomic disturbances were prevalent in all RTT females, irrespective of specific mutation groups.
- Neurophysiological evaluation revealed disturbed central autonomic control.
Conclusions:
- Objective cardiorespiratory data aids in organizing lifelong care for RTT patients.
- Further research is needed to understand autonomic dysfunction pathogenesis.
- Evidence-based management strategies for RTT require further development.
