3D clonal mapping in normal endometrial epithelium
This Learning Wednesday paper note highlights “Spatiotemporal dynamics of clonal selection and diversification in normal endometrial epithelium.” The study is relevant to spatial clonal dynamics in normal endometrial epithelium, focusing on how three-dimensional tissue context can alter what researchers observe and measure.
Selected notes from the paper
“It has become evident that somatic mutations in cancer-associated genes accumulate in the normal endometrium, but spatiotemporal understanding of the evolution and expansion of mutant clones is limited.”
"The latest three-dimensional (3D) imaging analyses have revealed that the morphology of the human endometrium is much more complicated than previously believed"
“In this work, we perform target-gene sequencing, whole-exome sequencing (WES), and whole-genome sequencing (WGS) for 1311 endometrial glands from 37 women across a wide range of ages.”
“More than half of the normal endometrial glands acquired numerous somatic mutations in genes that are frequently mutated in endometrial cancer and endometriosis-associated ovarian cancer.”
“The most frequently mutated genes included PIK3CA (15.6%), KRAS (10.9%), FBXW7 (8.1%), PIK3R1 (7.1%), and PPP2R1A (6.7%).”
“The presence of both clonal and subclonal mutations suggests that a cell clonally expands to form an endometrial gland, and the clone then acquires additional diversifying mutations.”
“Our dN/dS analysis indicates that up to over 90% of missense and nonsense mutations in pan‐gynecologic cancer‐associated genes have been positively selected, suggesting strong selective advantages even in normal endometrial tissue."
“Mutation profiling of endometrial glands guided by 3D imaging techniques can help illuminate mechanisms by which somatic mutations spread within the endometrial epithelium.”
“By examining continuous tomographic images, we visualized the plexus structures linking a set of glands with their root at the basal layer.”
“Specifically, the glandular structure at the bottom of the endometrium ran horizontally along the muscular layer, similar to a rhizome of grass [...] and several branches rose from the rhizome structure toward the luminal epithelium.”
“We demonstrated that the continuum of a rhizome and vertical glands had a monoclonal origin.”
“The 3D image was reconstructed to validate the spatial locations and continuity of the 13 glands.”
“Three-dimensional mapping of mutant clones in the endometrium will illuminate the path toward a more precise understanding of the mechanisms of endometrial regeneration during the menstrual cycle and the development of therapies for the prevention and treatment of endometrium-related diseases.”
From an Alpenglow perspective, this paper is useful because it connects spatial clonal dynamics in normal endometrial epithelium with a broader need in 3D spatial biology, measuring tissue architecture across depth while preserving context for quantitative analysis.
