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J Clin Endocrinol Metab. 2017 Aug 1;102(8):2836-2843. doi: 10.1210/jc.2017-00161.

Somatic USP8 Gene Mutations Are a Common Cause of Pediatric Cushing Disease.

Author information

1
Section on Endocrinology and Genetics, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.
2
Sackler School of Medicine, Tel Aviv University, Tel Aviv 6997801, Israel.
3
Department of Radiology and Imaging Sciences, Warren Grant Magnuson Clinical Center, National Institutes of Health, Bethesda, Maryland 20814.
4
Surgical Neurology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland 20824.
5
Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892.
6
Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis, Minnesota 55455.
7
Epidemiology Branch, Division of Intramural Population Health Research, National Institutes of Health, Rockville, Maryland 20852.

Abstract

Context:

Somatic mutations in the ubiquitin-specific protease 8 (USP8) gene have been recently identified as the most common genetic alteration in patients with Cushing disease (CD). However, the frequency of these mutations in the pediatric population has not been extensively assessed.

Objective:

We investigated the status of the USP8 gene at the somatic level in a cohort of pediatric patients with corticotroph adenomas.

Design and Methods:

The USP8 gene was fully sequenced in both germline and tumor DNA samples from 42 pediatric patients with CD. Clinical, biochemical, and imaging data were compared between patients with and without somatic USP8 mutations.

Results:

Five different USP8 mutations (three missense, one frameshift, and one in-frame deletion) were identified in 13 patients (31%), all of them located in exon 14 at the previously described mutational hotspot, affecting the 14-3-3 binding motif of the protein. Patients with somatic mutations were older at disease presentation [mean 5.1 ± 2.1 standard deviation (SD) vs 13.1 ± 3.6 years, P = 0.03]. Levels of urinary free cortisol, midnight serum cortisol, and adrenocorticotropic hormone, as well as tumor size and frequency of invasion of the cavernous sinus, were not significantly different between the two groups. However, patients harboring somatic USP8 mutations had a higher likelihood of recurrence compared with patients without mutations (46.2% vs 10.3%, P = 0.009).

Conclusion:

Somatic USP8 gene mutations are a common cause of pediatric CD. Patients harboring a somatic mutation had a higher likelihood of tumor recurrence, highlighting the potential importance of this molecular defect for the disease prognosis and the development of targeted therapeutic options.

PMID:
28505279
PMCID:
PMC5546857
DOI:
10.1210/jc.2017-00161
[Indexed for MEDLINE]
Free PMC Article

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