Abstract
Several studies have demonstrated that the neuropeptide peptide YY (PYY) plays an important role in feeding in mammals and fish. However, thus far, the feeding regulation function of PYY in Schizothorax davidi has not been well understood. Here, we identified the full-length cDNA sequence of PYY in S. davidi for the first time. S. davidi PYY contains 803bp nucleotides including a 328bp 3' untranslated region (UTR), a 181bp 5' UTR, and a 294bp open reading frame encoding a peptide of 97 amino acids. S. davidi PYY expression was observed in almost all tissues, with the highest expression detected in the hypothalamus. PYY mRNA expression in the hypothalamus was significantly elevated after a meal (P<0.01), and significantly decreased after fasting (P<0.01). PYY expression levels were increased sharply following refeeding after 9 days (P<0.01), suggesting that it might function as a satiety factor in S. davidi.
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