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- W2170493359 abstract "Chick embryos derive nutrients from the yolk during incubation and transition to intestinal absorption of nutrients posthatch. The uptake of nutrients is mediated by a variety of membrane-bound transporter proteins. The objective of this study was to determine the expression profiles of nutrient transporters and digestive enzymes during incubation in the yolk sac membrane (YSM) and embryonic intestine of egg-laying (Leghorn) and meat-producing (Cobb) chickens derived from 22 to 30 wk (young) and 45 to 50 wk (old) breeder flocks. Transporters examined included the peptide transporter PepT1, the glutamate/aspartate (EAAT3), cationic (CAT-1) and neutral (B0 AT) amino acid transporters, and the fructose (GLUT5) and glucose (SGLT1) transporters. Digestive enzymes included aminopeptidase N (APN) and sucrase-isomaltase (SI). Expression of these genes was assessed by real-time PCR using the absolute quantification method in YSM at embryonic day (E) 11, 13, 15, 17, 19, 20, and 21 and intestine at E15, 17, 19, 20, and 21. ThePepT1 andAPN gene expression in the YSM increased until E15 and then decreased until E21, whereas expression in the intestine increased from E15 to E21. TheB0 AT showed a similar pattern, with greatest expression in the YSM occurring at E17/E19. TheCAT1 andGLUT5 genes showed decreased expression in the YSM and increased expression in the intestine until E17/E19 and then a decrease until E21. Expression ofSGLT1 andEAAT3 showed increased gene expression over time in both the intestine and YSM. Expression ofSI showed little to no gene expression in the YSM, whereas the intestine exhibited consistently high levels of gene expression. In YSM and intestine,SI expression was greater in Leghorn than Cobb, whereasCAT1 andGLUT5 expression was greater in Cobb than Leghorn. Expression of theAPN,CAT1, andSI genes was greater in embryos from young flocks than old flocks in YSM and intestine. These results demonstrate that the YSM expresses many of the digestive enzymes and nutrient transporters typically associated with the intestine and that these genes show tissue- and development-specific patterns of expression." @default.
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- W2170493359 date "2012-08-01" @default.
- W2170493359 modified "2023-10-16" @default.
- W2170493359 title "Gene expression of nutrient transporters and digestive enzymes in the yolk sac membrane and small intestine of the developing embryonic chick" @default.
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- W2170493359 doi "https://doi.org/10.3382/ps.2011-02092" @default.
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