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Identification of a novel RASD1 somatic mutation in a USP8 -mutated corticotroph adenoma
Journal article   Open access   Peer reviewed

Identification of a novel RASD1 somatic mutation in a USP8 -mutated corticotroph adenoma

Andrew V Uzilov, Khadeen C Cheesman, Marc Y Fink, Leah C Newman, Chetanya Pandya, Yelena Lalazar, Marco Hefti, Mary Fowkes, Gintaras Deikus, Chun Yee Lau, …
Cold Spring Harbor molecular case studies, Vol.3(3), pp.a001602-a001602
05/2017
DOI: 10.1101/mcs.a001602
PMCID: PMC5411693
PMID: 28487882
url
https://doi.org/10.1101/mcs.a001602View
Published (Version of record) Open Access

Abstract

Cushing's disease (CD) is caused by pituitary corticotroph adenomas that secrete excess adrenocorticotropic hormone (ACTH). In these tumors, somatic mutations in the gene have been identified as recurrent and pathogenic and are the sole known molecular driver for CD. Although other somatic mutations were reported in these studies, their contribution to the pathogenesis of CD remains unexplored. No molecular drivers have been established for a large proportion of CD cases and tumor heterogeneity has not yet been investigated using genomics methods. Also, even in -mutant tumors, a possibility may exist of additional contributing mutations, following a paradigm from other neoplasm types where multiple somatic alterations contribute to neoplastic transformation. The current study utilizes whole-exome discovery sequencing on the Illumina platform, followed by targeted amplicon-validation sequencing on the Pacific Biosciences platform, to interrogate the somatic mutation landscape in a corticotroph adenoma resected from a CD patient. In this -mutated tumor, we identified an interesting somatic mutation in the gene , which is a component of the corticotropin-releasing hormone receptor signaling system. This finding may provide insight into a novel mechanism involving loss of feedback control to the corticotropin-releasing hormone receptor and subsequent deregulation of ACTH production in corticotroph tumors.
ras Proteins - genetics Adenoma - genetics Pituitary Neoplasms - genetics Humans Endosomal Sorting Complexes Required for Transport - genetics Receptors, Corticotropin-Releasing Hormone - genetics Ubiquitin Thiolesterase - genetics Adrenocorticotropic Hormone - genetics Sequence Analysis, DNA Pituitary ACTH Hypersecretion - genetics ACTH-Secreting Pituitary Adenoma - genetics Adult Female Mutation Corticotrophs - metabolism

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