Abstract:
In this study, melanocortin receptor-5 (
mc5
r) gene of
Spinibarbus hollandi was cloned by homology cloning and genome walking method. Bioinformatics methods were used to analyze the gene sequence and deduced amino acid sequence of
mc5
r. The tissue distribution, diurnal change and starvation response of mRNA expression were detected by real-time PCR. The full length of
mc5
r gene was 1 947 bp with one exon of 987 bp encoding 329 amino acids. According to multiple sequences alignment and phylogeny evolution analysis, the homology of
S. hollandi mc5
r amino acid sequence with
Cyprinus carpio and
Sinocyclocheilus rhinocerous reached 98%.
S. hollandi mc5
r had significant expression in brain, followed by diencephalon and heart, relatively less in mesencephalon and cerebellum, and weak in kidneys, stomach, muscles, spleen, intestines, gonadal, liver, medulla oblongata and eye. The diurnal periodicity expression of
mc5
r mRNA changed with day and night regularly. In the starvation refeeding experiment, the expression of refeeding fish increased significantly after starvation, but then decreased. It is indicated that
mc5
r may have some effects on food intake regulation.