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• W2955169675 abstract "Abstract Human endometrium is a highly dynamic tissue that undergoes hundreds of cycles of breakdown, rapid repair and remodelling in response to the oscillating levels of oestrogen and progesterone during female reproductive years. The marked regenerative capacity of this tissue’s epithelial compartment is maintained by intra-glandular adult stem cells (ASCs) that reside within the stratum basalis which is retained during menstruation. Although the endometrial ASCs were first described over a decade ago, they remain poorly characterised in comparison to their counterparts in other tissues, such as the small and the large intestines. In particular, the size of the stem cell pool within individual glands, the rates of their division, and mutational landscape are largely unknown. In this study, we isolated 215 morphologically normal endometrial glands from women aged 19 to 81 using laser capture microscopy. Analysis of whole-genome sequencing data identified that the overwhelming majority of the glands were clonal cell populations, and thus originating from a single ASC. Somatic mutations were found to accumulate at a linear rate during adult life. Elevated body mass index (BMI), a well-recognised risk factor for endometrial cancer, accelerated the rate of mutation acquisition. Surprisingly, despite the heterogeneity in age, reproductive history and BMI in our cohort, we find relatively homogenous mutational processes within normal endometrium. Comparison with cancer, shows lower somatic mutation burden and fewer operative signatures. Remarkably, we not only identify recurrent acquisitions of certain cancer-associated mutations, particularly those that are advantageous to cell growth, proliferation and migration, but also show that such events occur early in life, potentially even before adolescence. Over time, these mutant ASCs serve as a reservoir for the acquisition of further driver mutations to the extent that in some cases, the entire sampled endometrium becomes ‘neoplastic’ on the genomic level while still retaining the apparently normal phenotype. In older individuals, we observe a shift in the spectrum of acquired cancer-associated mutations, possibly reflecting post-menopausal changes in the levels of sex-steroid hormones and the resultant tissue microenvironment. Citation Format: Luiza Moore, Daniel Leongamornlert, Tim Coorens, Mathijs Sanders, Peter Ellis, Francesco Maura, Kevin Dawson, Simon F. Brunner, Jyoti Nangalia, Henry Lee-Six, Raheleh Rahbari, Patrick Tarpey, Yvette Hooks, Krishnaa Mahbubani, Christine A. Iacobuzio-Donahue, Jan J. Brosens, Inigo Martincorena, Kourosh Saeb-Parsy, Peter J. Campbell, Michael R. Stratton. The mutational landscape of normal human endometrial epithelium [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 970." @default.
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• W2955169675 date "2019-07-01" @default.
• W2955169675 modified "2023-10-12" @default.
• W2955169675 title "Abstract 970: The mutational landscape of normal human endometrial epithelium" @default.
• W2955169675 doi "https://doi.org/10.1158/1538-7445.am2019-970" @default.
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