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A novel INDEL mutation in the PTCH1 gene in a Chinese family with Gorlin syndrome.

Gorlin syndrome is a rare autosomal dominant disorder, and 50% of the cases are due to the mutation of PTCH1, the major receptor of the hedgehog signaling pathway. Here we report a new Gorlin syndrome family found in Xinzhou, China. A further sequence analysis found a novel PTCH1 INDEL mutation, NM_001083602.2: c.1516_1524delinsTGAGCTGGAGCTCCG (p. Ala506*), leading an N Terminal truncated protein. This truncated PTCH1 was considered as non-functional version as it loses almost all functional domains, including the 4-12 transmembrane domains and the intracellular and extracellular domains accordingly. Although the effect of the N-terminal truncated PTCH1 is not clear, Gorlin syndrome in these cases is due to haploinsufficiency. Our report enriches the Gorlin syndrome database and will help to unveil the molecular basis of this condition.