Pitt-Hopkins Syndrome

Pitt-Hopkins Syndrome is a severe neurodevelopmental disorder with profound speech impairment, intellectual disability, hypotonia and delayed motor development, distinctive facial features, constipation and episodes of awake hyperventilation followed by breath-holding. Seizures and severe myopia are common.

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Genetics

Usually caused by a de novo heterozygous loss-of-function variant or deletion of TCF4, resulting in autosomal dominant haploinsufficiency. Rare parental mosaicism can increase recurrence risk.

Molecular Mechanism

TCF4 is a dosage-sensitive basic helix-loop-helix transcription factor that regulates neuronal differentiation, excitability, synaptic development and respiratory-network function. Haploinsufficiency alters broad developmental gene-expression programmes.

Therapy

Treatment is supportive and includes augmentative communication, developmental therapies, seizure management, treatment of constipation and feeding problems, ophthalmologic care and monitoring of breathing dysrhythmia. Gene-restoration and transcriptional rescue approaches remain experimental.

CCP Activity

This indication is currently listed for strategic assessment; no specific experimental programme has yet been defined. A future entry should specify the patient genotype, model, primary translational endpoint and intended therapeutic modality before experimental work begins.

Mouse Models Mouse Models & Gene Cards

Mouse Models	Gene Cards
TBD	TBD