Somatic mosaicism for Y120X mutation in the MECP2 gene causes atypical Rett syndrome in a male.
Rett Syndrome (RS; MIM_312750) is a severe and progressive neurodevelopmental disorder affecting principally females. Mutations in X-Linked MECP2 gene (methyl CpG-binding protein 2; MIM_300005) have been reported as being the major cause of RS. Mutations in this gene have been described as cause of wide spectrum of neurological disorders and mental retardation in males. In some cases, mutations in MECP2 in males produce clinical picture similar to RS. Here we report the identification of the novel truncating mutation Y120X in a 4-year-old child with atypical RS phenotype. Chromosome analysis showed a normal karyotype, and blood DNA and tissue DNA analysis reveal a mosaic for the mutation. Patient's mother DNA analysis showed that this is a de novo mutation, that has never been described before in any female or male case of RS.
Unidad de Gestión Clínica de Genética, Reproducción y Medicina Fetal, Instituto de Biomedicina de Sevilla (IBIS), Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Spain.
Juan I
JI
Pieras
Beatriz
B
Muñoz-Cabello
Salud
S
Borrego
Irene
I
Marcos
Javier
J
Sanchez
Marcos
M
Madruga
Guillermo
G
Antiñolo
D002675:Child, Preschool; D004252:DNA Mutational Analysis; D005260:Female; D006801:Humans; D008297:Male; D051783:Methyl-CpG-Binding Protein 2 / Q000235:genetics*; D009030:Mosaicism; D009154:Mutation; D015518:Rett Syndrome / Q000235:genetics*
D051783:Methyl-CpG-Binding Protein 2