| Summary: | Rett syndrome is a dominant X-linked male-lethal disorder largely caused by mutations in the gene encoding methyl-CpG binding protein 2 (MECP2). Clinical manifestations include neurodevelopmental disorder characterized by early-onset intractable seizures, severe developmental delay, intellectual disability, and abnormal electroencephalograms. Afflicted females show normal development until the age of 6 to 18 months, followed by gradual loss of speech abilities, microcephaly, social impairment, ataxia, and stereotypic hand movements. We report a 7-year-old girl who was born of a nonconsanguineous marriage presenting with mental retardation and delayed development. Physical examination revealed loss of speech, repetitive hand-wringing movement, short stature (120 cm), strabismus, microcephaly, and autistic behavior. The diagnosis was confirmed by sequencing MECP2 gene with heterozygous mutation C385A in exon 2. The current study aimed to report the first case of Rett syndrome in the Azeri Turkish population.
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