Variant Profile of MECP2 Gene in Sri Lankan Patients with Rett Syndrome

J Autism Dev Disord. 2020 Jan;50(1):118-126. doi: 10.1007/s10803-019-04230-7.

Abstract

Rett syndrome (RTT) is a rare monogenic disorder affecting 1 in 10,000 live female births causing severe neurodegenerative symptoms. We analyzed the molecular genetic variants in the gene encoding the methyl-CpG binding protein 2 (MECP2) of 16 girls with RTT. Their mutation profile was as follows; Already described variants: p.R168X in 25% (n = 4), p.T158M in 25% (n = 4), p.R255X in 12.5% (n = 2), p.R133C in 12.5% (n = 2), p.R294X in 6.25% (n = 1), p.K177X in 6.25% (n = 1). Novel variants: a large deletion (c.868_1188del321) in 6.25% (n = 1) and a p.X499L in 6.25% (n = 1). We also looked at the genotype to phenotype correlation of these variants. Most of the mutations were C>T in CpG hot spot as seen in other populations.

Keywords: Methyl-CpG binding protein 2; Mutation profile; Neurodevelopmental disorder; RTT; Rett syndrome.

MeSH terms

  • Adult
  • Female
  • Genotype
  • Humans
  • Methyl-CpG-Binding Protein 2 / genetics*
  • Mutation
  • Phenotype
  • Rare Diseases
  • Rett Syndrome / ethnology
  • Rett Syndrome / genetics*
  • Sri Lanka

Substances

  • Methyl-CpG-Binding Protein 2