dataset
posted on 2024-06-04, 07:41 authored by Elena Meuser, Kyle Chang, Angharad Walters, Joanna J. Hurley, Hannah D. West, Iain Perry, Matthew Mort, Laura Reyes-Uribe, Rebekah Truscott, Nicholas Jones, Rachel Lawrence, Gareth Jenkins, Peter Giles, Sunil Dolwani, Bilal Al-Sarireh, Neil Hawkes, Emma Short, Geraint T. Williams, Melissa W. Taggart, Kim Luetchford, Patrick M. Lynch, Diantha Terlouw, Maartje Nielsen, Sarah-Jane Walton, Andrew Latchford, Susan K. Clark, Julian R. Sampson, Eduardo Vilar, Laura E. Thomas Germline and somatic mutations in FAP patient derived duodenal organoids
Funding
Health and Care Research Wales (HCRW)
National Institutes of Health (NIH)
History
ARTICLE ABSTRACT
The pathogenesis of duodenal tumors in the inherited tumor syndromes familial adenomatous polyposis (FAP) and MUTYH-associated polyposis (MAP) is poorly understood. This study aimed to identify genes that are significantly mutated in these tumors and to explore the effects of these mutations. Whole exome and whole transcriptome sequencing identified recurrent somatic coding variants of phosphatidylinositol N-acetylglucosaminyltransferase subunit A (PIGA) in 19/70 (27%) FAP and MAP duodenal adenomas, and further confirmed the established driver roles for APC and KRAS. PIGA catalyzes the first step in glycosylphosphatidylinositol (GPI) anchor biosynthesis. Flow cytometry of PIGA-mutant adenoma-derived and CRISPR-edited duodenal organoids confirmed loss of GPI anchors in duodenal epithelial cells and transcriptional profiling of duodenal adenomas revealed transcriptional signatures associated with loss of PIGA.
PIGA somatic mutation in duodenal tumors from patients with FAP and MAP and loss of membrane GPI-anchors may present new opportunities for understanding and intervention in duodenal tumorigenesis.
