Salmonella is one of the most common food-borne pathogens and its resistance in chicken can be improved through genetic selection. The heterophils/lymphocytes (H/L) ratio in the blood reflects the immune system status of chicken. We compared the genome data and spleen transcriptomes between the H/L ratio-selected and non-selected chickens, after Salmonella infection, aiming to identify the key genes participating in the antibacterial activity in the spleen. The results revealed that, the selected population had stronger (P<0.05) liver resistance to Salmonella typhimurium (ST) than the non-selected population. In the selected and non-selected lines, the identified differentiation genes encode proteins involved in biological processes or metabolic pathways that included the TGF-beta signaling pathway, FoxO signaling pathway, and Salmonella infection pathway. The results of the analysis of all identified differentially expressed genes (DEGs) of spleen revealed that the G protein-coupled receptor (GPCR) and insulin-like growth factor (IGF-I) signaling pathways were involved in the Salmonella infection pathway. Integrated analysis of DEGs and FST (fixation index), identified candidate genes involved in Salmonella infection pathway, such as GPR39, NTRK2, and ANXA1. The extensive genomic changes highlight the polygenic genetic of the immune response in these chicken populations. Numerous genes related to the immune performance are differentially expressed in the selected and non-selected lines and the selected lines has a higher resistance to Salmonella.

WANG Jie;ZHANG Qi;Astrid Lissette BARRETO SáNCHEZ;ZHU Bo;WANG Qiao;ZHENG Mai-qing;LI Qing-he;CUI Huan-xian;WEN Jie;ZHAO Gui-ping

State Key Laboratory of Animal Nutrition,Institute of Animal Sciences,Chinese Academy of Agricultural Sciences,Beijing 100193,P.R.China

农业科学学报（英文）

[1]WANG Jie;ZHANG Qi;Astrid Lissette BARRETO SáNCHEZ;ZHU Bo;WANG Qiao;ZHENG Mai-qing;LI Qing-he;CUI Huan-xian;WEN Jie;ZHAO Gui-ping-.Transcriptome analysis of the spleen of heterophils to lymphocytes ratio-selected chickens revealed their mechanism of differential resistance to Salmonella)[J].农业科学学报（英文）,2022(08):2372-2383

heterophils,GPR39

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