About Pitt-Hopkins Syndrome
Pitt-Hopkins syndrome is a neurodevelopmental disorder caused by haploinsufficiency of TCF4 (transcription factor 4), encoding a basic helix-loop-helix transcription factor involved in brain development. Clinical features include intellectual disability, absence or severe impairment of speech, distinctive facial features (wide mouth, prominent nasal bridge, widely spaced teeth), breathing abnormalities (episodic hyperventilation followed by apnea), epilepsy, and behavioral features overlapping with autism spectrum disorder.
Common Clinical Features
Clinical Trial Eligibility Tips
What to know before applying to Pitt-Hopkins Syndrome trials.
TCF4 pathogenic variant (deletion, truncating mutation, or missense) confirmed by array CGH or sequencing is required
Breathing pattern documentation (episodic hyperventilation/apnea) is a diagnostic feature — overnight oximetry may be required
Communication and adaptive behavior assessments (Vineland, DEAP, non-verbal cognitive measures) are required baseline tools
Pitt-Hopkins-like syndromes (CNTNAP2, NRXN1) are genetically distinct — specific TCF4 confirmation avoids misclassification in trials
Patient Resources
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