Genetics of colour variation in wild versus cultured queen loach, Botia dario (Hamilton, 1822).

Genomics
Sagar Chandra MandalJanmejay Parhi

Abstract

The Queen loach (Botia dario), an ornamental fish species having export potential, belongs to family Cobitidae of order Cypriniformes. The dull colouration in captive condition as compared to nature is a drawback in ornamental fisheries. We report the first comparative transcriptomic analysis of Cultured (CBD) and Natural (NBD) B. dario using bioinformatics tools. Total 26 and 7 key genes for melanin and carotenoid colouration were found, respectively. KEGG pathway annotations of the genes were carried out, to annotate and describe their relevance for pigmentation. The qPCR validation of genes confirmed their expression pattern in the skin and muscle. Differential expression of, slc7a11, asip1, mc1r, dct, tyrp1a, tyr, bcdo2, csf1r, plin2, gsta2, star3 and stard5 in the skin and muscle tissues revealed the reasons for wild versus cultured colour variation. The molecular data was further supported by low yellowness and redness values of CBD skin and muscle in a colorimeter.

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