Format

Send to

Choose Destination
See comment in PubMed Commons below
J Clin Endocrinol Metab. 2012 Oct;97(10):E1995-2005. doi: 10.1210/jc.2012-2303. Epub 2012 Aug 1.

Whole-exome sequencing studies of nonhereditary (sporadic) parathyroid adenomas.

Author information

1
Academic Endocrine Unit, Nuffield Department of Clinical Medicine, University of Oxford, and Department of Surgery, John Radcliffe Hospital, Oxford University Hospitals Trust, Oxford, UK.

Abstract

CONTEXT:

Genetic abnormalities, such as those of multiple endocrine neoplasia type 1 (MEN1) and Cyclin D1 (CCND1) genes, occur in <50% of nonhereditary (sporadic) parathyroid adenomas.

OBJECTIVE:

To identify genetic abnormalities in nonhereditary parathyroid adenomas by whole-exome sequence analysis.

DESIGN:

Whole-exome sequence analysis was performed on parathyroid adenomas and leukocyte DNA samples from 16 postmenopausal women without a family history of parathyroid tumors or MEN1 and in whom primary hyperparathyroidism due to single-gland disease was cured by surgery. Somatic variants confirmed in this discovery set were assessed in 24 other parathyroid adenomas.

RESULTS:

Over 90% of targeted exons were captured and represented by more than 10 base reads. Analysis identified 212 somatic variants (median eight per tumor; range, 2-110), with the majority being heterozygous nonsynonymous single-nucleotide variants that predicted missense amino acid substitutions. Somatic MEN1 mutations occurred in six of 16 (∼35%) parathyroid adenomas, in association with loss of heterozygosity on chromosome 11. However, no other gene was mutated in more than one tumor. Mutations in several genes that may represent low-frequency driver mutations were identified, including a protection of telomeres 1 (POT1) mutation that resulted in exon skipping and disruption to the single-stranded DNA-binding domain, which may contribute to increased genomic instability and the observed high mutation rate in one tumor.

CONCLUSIONS:

Parathyroid adenomas typically harbor few somatic variants, consistent with their low proliferation rates. MEN1 mutation represents the major driver in sporadic parathyroid tumorigenesis although multiple low-frequency driver mutations likely account for tumors not harboring somatic MEN1 mutations.

PMID:
22855342
PMCID:
PMC4446457
DOI:
10.1210/jc.2012-2303
[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Silverchair Information Systems Icon for PubMed Central
    Loading ...
    Support Center