"In the asymptomatic mother the mutated copy of the CDKL5 gene was inactivated in 90% of blood cells. We also identified a premature stop codon (p.Arg926*) in IQSEC2 in a patient with a Rett-like phenotype. Finally exome sequencing enabled us to characterize a heterozygous de novo missense (p.Val408Ala) in KCNA2 in a girl with infantile-onset seizures variant of Rett syndrome (RTT)"xsd:string