A 26-year-old woman with psychomotor developmental delay since late infancy showed rapid deterioration of her psychomotor abilities at the 11 years of age. She had gained the ability to verbally express herself and perform motor activities such as running and dancing in early childhood, but she lost the ability to verbally communicate and was unable to walk independently after this period. She also presented with dystonia in the right extremities, which markedly fluctuated with a periodicity of hours to months. Sleep disturbance and epileptic seizures also emerged during adolescence. Frontal lobe atrophy and hypoperfusion of the left cerebral hemisphere were noted on neuroimaging examinations. Analysis of the MECP2 gene revealed a late truncating mutation of c.1196_1200delCCACC (p.P399QfsX4) near the 3'-terminal of the coding region. The phenotype of this patient corresponds to the rare, unestablished variant of "late childhood deterioration" in MECP2-related disorders. For the first time, MECP2 mutation was confirmed to be the genetic basis of this condition.
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