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Identification of molecular markers that are expressed in discrete anterior-posterior domains of the endoderm from the gastrula stage to mid-gestation. | LitMetric

AI Article Synopsis

Article Abstract

Little is known about how the endoderm germ layer is patterned along the anterior-posterior (A-P) axis before the formation of a gut tube (embryonic day [e] 7.5-8.5 in mouse), largely due to a paucity of molecular markers of endoderm. In particular, there are few genes that mark posterior domains of endoderm that give rise to the midgut and hindgut. We have identified 8 molecular markers that are expressed in discrete domains of the gastrula stage endoderm (e7.5), suggesting that a significant level of pattern exists in the endoderm before the formation of a gut tube. Three genes Tmprss2, NM_029639, and Dsp are expressed in a presumptive midgut domain overlying the node, a domain for which molecular markers have not previously been identified. Two genes, Klf5 and Epha2 are expressed in posterior endoderm associated with the primitive streak. Expression of these five genes persists in the midgut and/or hindgut at e8.5, 9.5 and 10.5, suggesting that these genes are markers of these domains throughout these stages of development. We have identified three genes Slc39a8, Amot, and Dp1l1, which are expressed in the visceral endoderm at e7.5. Starting at e9.5, Dp1l1 is expressed de novo in the liver, midgut, and hindgut. Our findings suggest that presumptive midgut and hindgut domains are being established at the molecular level by the end of gastrulation, earlier than previously thought, and emphasize the importance of endoderm patterning before the formation of the fetal gut.

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http://dx.doi.org/10.1002/dvdy.21204DOI Listing

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