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Background  G-protein subunit beta 1 like ( GNB1L ) encodes a G-protein beta-subunit-like polypeptide. Chicken  GNB1L  is upregulated in the breast muscle of high feed efficiency chickens, and its expression is 1.52-fold that in low feed efficiency chickens. However, no report has described the effects of  GNB1L  indels on the chicken carcass and growth traits.    Results  This study identified a 31-bp indel in the 5′ untranslated region (UTR) of  GNB1L  and elucidated the effect of this gene mutation on the carcass and growth traits in chickens. The 31-bp indel showed a highly significant association with the body weight at 8 different stages and was significantly correlated with daily gains at 0 to 4 weeks and 4 to 8 weeks. Similarly, the mutation was significantly associated with small intestine length, breast width, breast depth and breast muscle weight. Moreover,  DD  and  ID  were superior genotypes for chicken growth and carcass traits.    Conclusions  These results show that the 31-bp indel of  GNB1L  significantly affects chicken body weight and carcass traits and can serve as a candidate molecular marker for chicken genetics and breeding programs.

A 31-bp indel in the 5′ UTR region of GNB1L is significantly associated with chicken body weight and carcass traits