Regional epithelial cell diversity in the small intestine of pigs

Wiarda, Jayne E.; Becker, Sage R.; Sivasankaran, Sathesh K.; Loving, Crystal L.

doi:10.1093/jas/skac318

Regional epithelial cell diversity in the small intestine of pigs

Journal Article · 02 October 2022 · Journal of Animal Science

DOI:https://doi.org/10.1093/jas/skac318· OSTI ID:2425785

; Becker, Sage R.; Sivasankaran, Sathesh K.; Loving, Crystal L.

Abstract

Understanding regional distribution and specialization of small intestinal epithelial cells is crucial for developing methods to control appetite, stress, and nutrient uptake in swine. To establish a better understanding of specific epithelial cells found across different regions of the small intestine in pigs, we utilized single-cell RNA sequencing (scRNA-seq) to recover and analyze epithelial cells from duodenum, jejunum, and ileum. Cells identified included crypt cells, enterocytes, BEST4 enterocytes, goblet cells, and enteroendocrine (EE) cells. EE cells were divided into two subsets based on the level of expression of the EE lineage commitment gene, NEUROD1. NEUROD1hi EE cells had minimal expression of hormone-encoding genes and were dissimilar to EE cells in humans and mice, indicating a subset of EE cells unique to pigs. Recently discovered BEST4 enterocytes were detected in both crypts and villi throughout the small intestine via in situ staining, unlike in humans, where BEST4 enterocytes are found only in small intestinal villi. Proximal-to-distal gradients of expression were noted for hormone-encoding genes in EE cells and nutrient transport genes in enterocytes via scRNA-seq, demonstrating regional specialization. Regional gene expression in EE cells and enterocytes was validated via quantitative PCR (qPCR) analysis of RNA isolated from epithelial cells of different small intestinal locations. Though many genes had similar patterns of regional expression when assessed by qPCR of total epithelial cells, some regional expression was only detected via scRNA-seq, highlighting advantages of scRNA-seq to deconvolute cell type-specific regional gene expression when compared to analysis of bulk samples. Overall, results provide new information on regional localization and transcriptional profiles of epithelial cells in the pig small intestine.

Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: SC0014664

OSTI ID:: 2425785

Journal Information:: Journal of Animal Science, Journal Name: Journal of Animal Science Vol. 101; ISSN 0021-8812

Publisher:: American Society of Animal Science - Oxford University Press

Country of Publication:: United States

Language:: English

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