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14 April 2020 Cloning, phylogenetic analysis, and postnatal expression of oligopeptide transporter PepT1 in gastrointestinal tract of kid goats receiving supplemental feed or pasture
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Abstract

This study aimed to clone the cDNA of PepT1, an H+-dependent oligopeptide transporter, from kid goats and examine effects of physiological development (suckling, weaning, and post-weaning) of the animal and feeding system (supplemental feeding vs. grazing) on peptide transport capability. A 2395 bp cDNA sequence of pept1 (GenBank: MH308024) was cloned and phylogenetic analysis revealed a high homology and structure similarity with PepT1 of sheep and cattle. The pept1 was expressed throughout the gastrointestinal tract of kid goats immediately after birth and during development. Relative abundance of pept1 decreased in all segments except the middle-jejunum during suckling, whereas its expression in most segments of small intestine increased with age after weaning and remained stable thereafter. Middle-jejunum was the predominant expression site and probably the main peptide absorption site. Supplemental feeding enhanced pept1 expression because it increased protein intake compared with grazing. No feeding system × age interaction was observed in most segments; the expression was age related during suckling and diet related during weaning and post-weaning, indicating that feeding system and age had independent effects on pept1 expression. These results indicate that PepT1 plays an important role for protein nutrition in neonatal goats, and its expression can be affected by feeding system.

Copyright remains with authors Li, Liu, Zhou, He, and Tan, as well as Her Majesty the Queen in right of Canada 2020. Permission for reuse (free in most cases) can be obtained from copyright.com.
Tao Ran, Hengzhi Li, Yong Liu, Chuanshe Zhou, Zhixiong He, Zhiliang Tan, Wenzhu Yang, and Karen A. Beauchemin "Cloning, phylogenetic analysis, and postnatal expression of oligopeptide transporter PepT1 in gastrointestinal tract of kid goats receiving supplemental feed or pasture," Canadian Journal of Animal Science 100(4), 605-614, (14 April 2020). https://doi.org/10.1139/cjas-2019-0155
Received: 22 August 2019; Accepted: 17 January 2020; Published: 14 April 2020
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