大肠杆菌F18菌株敏感和抵抗基因型仔猪十二指肠基因表达谱差异分析

文章运用Agilent 双标记表达谱芯片, 基于已建立的苏太猪大肠杆菌F18菌株敏感性和抗性型全同胞配对个体, 分析十二指肠组织基因表达谱差异, 旨在筛选导致仔猪断奶后腹泻和水肿病发生的大肠杆菌F18菌株受体相关基因, 探讨造成大肠杆菌病抗性和敏感性资源家系抗性差异的分子生物学机理。研究结果显示, 以Fold change绝对值大于2倍进行筛选, 在敏感型(GG基因型)对抗性型(AA基因型)配对组中, 差异基因共13个, 其中上调6个, 下调7个, 在以敏感型(AG基因型)对抗性型(AA基因型)配对组中, 共筛选出差异基因6个, 其中上调4个, 下调2个。经GO分析发现差异基因的生物学过程主要涉及免疫应答、胞外区修饰(如糖基化)、细胞黏附、信号转导等。通路发现大肠杆菌F18菌株抵抗性和敏感性差异基因主要涉及糖脂合成代谢以及炎症免疫相关通路, 经芯片筛选出的相关基因的功能还需进一步的研究验证。

cDNA microarray on differently expressed genes in duodenum in porcine sensitive or resistant to Escherichia coli F18

Based on the paired full-sib individuals selected from the established resource populations of Sutai pig that were characterized as resistant or sensitive to ETEC F18, Agilent double labeled cDNA microarray was used to identify the gene expression profiles in duodenum on purpose of investigating the genes related to Escherichia coli F18 receptor, which may cause edema disease and post-weaning diarrhea in piglets, as well as exploring the molecular mechanism about the differences involved in two different lineages. The results showed that thirteen differently expressed genes were found in one matched group including sensitive ones with GG genotype comparing with resistant ones with AA genotype at a two-fold filter, where there were 6 up-regulated genes and 7 down-regulated genes. In the other matched group composed of sensitive ones with AG genotype, 4 up-regulated genes and 2 down-regulated genes, 6 in total were screened out. GO analy-sis revealed that the differently expressed genes participated in many biological processes, such as immune response, ex-tracellular region, bacterial binding, response to external stimulus and so on. Meanwhile, these genes were mainly related to the Glycan Biosynthesis and Metabolism and Immune System pathways. Actually, the roles that they may play in edema disease and post-weaning diarrhea need further study and verification.