Preferred Label : Rett syndrome, congenital variant;
Type : Phenotype, molecular basis known;
Description : The congenital variant of Rett syndrome is a severe neurodevelopmental disorder with
features of classic Rett syndrome (RTT; 312750), but earlier onset in the first months
of life. Classic Rett syndrome shows later onset and is caused by mutation in the
MECP2 gene (300005).;
Inheritance : Autosomal dominant;
Molecular basis : Caused by mutation in the forkhead box G1 gene (FOXG1, 164874.0001);