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A missense mutation in PTCH2 underlies dominantly inherited NBCCS in a Chinese family

¹ Molecular Laboratory for Gene Therapy, Capital Medical University School of Stomatology, Beijing, China
² Laboratory of Molecular Signaling and Apoptosis, Department of Biologic and Materials Sciences, University of Michigan, Michigan, USA
³ Chinese National Human Genome Center, Beijing, China and National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China

Correspondence to:
Dr S L Wang: Molecular Laboratory for Gene Therapy, Capital Medical University School of Stomatology, Tian Tan Xi Li No.4, Beijing, 100050, China; songlinwang{at}dentist.org.cn]

ABSTRACT
Background: Naevoid basal cell carcinoma syndrome (NBCCS) is a pleiotropic, autosomal dominant disease. Growing evidence suggests that the disorder may result from mutations in genes of the Sonic hedgehog (Shh) signalling pathway.

Objective: To investigate the pathogenic gene in a Chinese Han family with NBCCS.

Methods: Mapping and mutation screening were used to investigate the candidate genes SHH, PTCH, PTCH2 and SMO. A GLI1 reporter gene and a cell growth curve were used to examine functional consequences of the detected mutant.

Results: One novel mutation, a GA transition (2157GA) in exon 15 of the PTCH2 gene, was identified in this family with NBCCS by direct sequencing and digestion with the AvaI restriction enzyme. The mutation was not found in normal family members or in 520 controls. The mutation led to an R719Q amino acid substitution in an extracellular loop of the PTCH2 protein. Functional studies revealed that the R719Q mutation resulted in inactivation of PTCH2 inhibitory activities. In contrast to wild type PTCH2, PTCH2-R719Q could not inhibit cell proliferation.

Conclusion: PTCH2 (2157GA), a novel missense mutation, underlies NBCCS, resulting in the loss of PTCH2 inhibitory function in the Shh signalling pathway.