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A syndrome characterized by severe mental retardation and variable additional symptoms, such as impaired speech development, autistic behavior, breathing anomalies and a broad mouth, resembling Pitt-Hopkins syndrome. Other features include decreased reflexes in the upper extremities, constipation, strabismus, and protruding tongue with drooling. In contrast to patients with Pitt-Hopkins syndrome, PTHSL2 patients present with normal or only mildly to moderately delayed motor milestones.




MeSH; D006985
MeSH; D008607


Mental retardation


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