脾脏转录组分析揭示了H/L选育群体雏鸡对沙门氏菌的抗性差异机制

doi:10.1016/S2095-3119(21)63770-X

摘要/Abstract

摘要：

本研究比较H/L选育群体和非选育群体的基因组数据和沙门氏菌感染后的脾脏转录组数据，旨在鉴定H/L选育过程中参与脾脏抗菌能力的关键基因。在选择系第10代，从H/L选育系和对照系分别选取41只和31只个体采集外周血样本提取DNA，并基于55K SNP芯片进行基因分型进行选择信号分析；分别选取选育系和对照系群体于7日龄进行鼠伤寒沙门氏菌（ST）感染试验，感染后3d测定肝组织载菌量和血液溶菌酶含量，同时采集脾脏组织（N=9）进行转录组分析；结合选择信号和脾脏转录组结果共同鉴定脾脏中参与沙门氏菌抵抗的候选基因。结果表明，与对照系群体相比，H/L选育群体对鼠伤寒沙门氏菌的抗性更强（P<0.05）。在选育系和对照系之间，鉴定的分化基因主要参与TGF-β信号通路、FoxO信号通路和沙门氏菌感染通路。对所有鉴定得到的脾脏差异表达基因（DEGs）的分析结果表明，沙门氏菌感染途径涉及的G蛋白偶联受体（GPCR）和胰岛素样生长因子（IGF-I）信号通路被显著富集（p<0.01）。基于DEGs和Fst（Fixation index）的综合分析鉴定了参与沙门氏菌感染途径的候选基因，如GPR39、NTRK2和ANXA1。广泛的基因组变化显示了在鸡群中免疫反应的多基因遗传基础。许多与免疫防御功能相关的基因在H/L选育和对照系中差异表达，选育系群体对沙门氏菌表现出更强的抗性。该研究确定了在用ST攻击后易感鸡和抗性鸡中差异表达的基因和通路，以更好地了解宿主对ST感染的免疫抗性。本研究利用动物模型（H/L定向选育系和对照系）的基因组数据和脾脏转录组数据进行了系统性的研究，解析了H/L定向选育后脾脏影响沙门氏菌抗性的分子机制。

Abstract:

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 F_ST (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.

Key words: heterophils/lymphocytes , selective sweep , RNA-seq , Salmonella typhimurium , disease-resistance

. 脾脏转录组分析揭示了H/L选育群体雏鸡对沙门氏菌的抗性差异机制[J]. Journal of Integrative Agriculture, 2022, 21(8): 2372-2383.

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]. Journal of Integrative Agriculture, 2022, 21(8): 2372-2383.

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