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Recurrence of CCHS associated PHOX2B poly-alanine expansion mutation due to maternal mosaicism
Tiziana Bachetti1, Marco Di Duca, Matteo Della Monica
1U.O.C. Medical Genetics, Institute Giannina Gaslini, Genova, Italy.
Abstract:
Heterozygous in frame trinucleotide duplications within the PHOX2B gene, leading to poly-alanine expansions, cause Congenital Central Hypoventilation Syndrome. Here we report about a CCHS patient, carrying a +13Ala PHOX2B expansion, whose asymptomatic mother resulted with a low level of mosaicism for the same mutation in peripheral blood cells. Her second pregnancy ended with the spontaneous miscarriage of a fetus who had inherited the PHOX2B mutation, thus confirming germline mosaicism in the mother and the need of proper genetic counseling to CCHS families.
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