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Congenital central hypoventilation syndrome: Severe disease caused by co-occurrence of two PHOX2B variants inherited separately from asymptomatic family members

Sivan, Y.; Zhou, A.; Jennings, L. J.; Berry-Kravis, E. M.; Yu, M.; Zhou, L.; Rand, C. M.; Weese-Mayer, D. E.

Am J Med Genet A. 2019 Jan 24; 179(3):503-506

Abstract

Congenital Central Hypoventilation Syndrome (CCHS) is a rare disease characterized by autonomic nervous system dysregulation. Central hypoventilation is the most prominent and clinically important presentation. CCHS is caused by mutations in paired-like homeobox 2b (PHOX2B) and is inherited in an autosomal dominant pattern. A co-occurrence of two asymptomatic PHOX2B variants with a classical CCHS presentation highlights the importance of clinical PHOX2B testing in parents and family members of all CCHS probands. Despite being an autosomal dominant disease, once a polyalanine repeat expansion mutation has been identified, sequencing of the other allele should also be considered.

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