Ten novel insertion/deletion variants in MECP2 identified in Japanese patients with Rett syndrome

Rett syndrome (RTT) is an X-linked progressive and severe neurological disorder caused by mutations in the gene encoding methyl CpG binding protein 2 ( MECP2 ). Among the 49 typical RTT patients examined, we identified 10 novel and eight known insertion/deletion variants, and 31 known pathogenic variants in MECP2 . The pathogenic variants presented here should be a useful resource for examining the correlation between the genotypes and phenotypes of RTT.