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Mol Genet Genomic Med. 2018 Nov 8. doi: 10.1002/mgg3.498. [Epub ahead of print]

Whole-exome sequencing of nevoid basal cell carcinoma syndrome families and review of Human Gene Mutation Database PTCH1 mutation data.

Author information

1
Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
2
Division of Cancer Control and Population Science, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
3
Cancer Genomics Research Laboratory, Leidos Biomedical Research, Frederick National Laboratory for Cancer Research, Frederick, Maryland.

Abstract

BACKGROUND:

Nevoid basal cell carcinoma syndrome (NBCCS) is an autosomal dominant disorder with variable expression and nearly complete penetrance. PTCH1 is the major susceptibility locus and has no known hot spots or genotype-phenotype relationships.

METHODS:

We evaluated 18 NBCCS National Cancer Institute (NCI) families plus PTCH1 data on 333 NBCCS disease-causing mutations (DM) reported in the Human Gene Mutation Database (HGMD). National Cancer Institute families underwent comprehensive genomic evaluation, and clinical data were extracted from NCI and HGMD cases. Genotype-phenotype relationships were analyzed using Fisher's exact tests focusing on mutation type and PTCH1 domains.

RESULTS:

PTCH1 pathogenic mutations were identified in 16 of 18 NCI families, including three previously mutation-negative families. PTCH1 mutations were spread across the gene with no hot spot. After adjustment for multiple tests, a statistically significant genotype-phenotype association was observed for developmental delay and gross deletion-insertions (p = 9.0 × 10-6 ), and suggestive associations between falx cerebri calcification and all transmembrane domains (p = 0.002) and severe outcomes and gross deletion-insertions (p = 4.0 × 10-4 ).

CONCLUSION:

Overall, 89% of our NCI families had a pathogenic PTCH1 mutation. The identification of PTCH1 mutations in previously mutation-negative families underscores the importance of repeated testing when new technologies become available. Additional clinical information linked to mutation databases would enhance follow-up and future studies of genotype-phenotype relationships.

KEYWORDS:

PTCH1; genotype-phenotype; nevoid basal cell carcinoma syndrome; pathogenic mutations; whole-exome sequencing

PMID:
30411536
DOI:
10.1002/mgg3.498
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