An economically-important trait in poultry for which gene identification <span style="font-family:Verdana;">continues to be a challenge is immune response. The objective of the study </span><s...An economically-important trait in poultry for which gene identification <span style="font-family:Verdana;">continues to be a challenge is immune response. The objective of the study </span><span style="font-family:Verdana;">was</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">to quantitate the expression of major histocompatibility complex (MHC) class II <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> gene at cytolytic and latent immune response stages in Nigerian indigenous chickens. </span><span style="font-family:Verdana;">A total of 108 Nigerian indigenous chickens (NIC) were sourced across the South-western states in Nigeria. The birds were inoculated with sheep red blood cells (SRBC), after which blood samples were obtained (5 days post-inoculation) and antibody haemagglutination test was carried out to place the birds into groups of high and low antibody titre levels.</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">The categorisation of the birds resulted in six groups of normal feather high, normal feather low, naked neck high, naked neck low, frizzle feather high and frizzle feather low antibody groups. </span><span style="font-family:Verdana;">A total of 48 chicks w</span></span><span style="font-family:Verdana;">ere</span><span style="font-family:Verdana;"> selected from the progeny for gene expression studies. </span><span style="font-family:Verdana;">Surgical excision of thymus and spleen was carried out for the detection of cytolytic and latent responses of the birds. β-actin was used as the endogenous control and the critical threshold method</span><span> </span><span style="font-family:Verdana;">(2<span style="white-space:nowrap;"><sup></sup></span><sup></sup></span><span style="font-family:;" "=""><span style="font-family:Verdana;"><sup>–ΔΔCт</sup><span style="white-space:nowrap;"></span>) was carried out for the determination of fold change. The fold change of spleen tissue expression at cytolytic immune response of the birds was 30,362.44 compared to latent response 294.07;and the fold change of thymus expression at cytolytic immune response of the birds was 51.98 compared to latent response 5.24</span><i><span style="font-family:Verdana;">. </span></i><span style="font-family:Verdana;">At both cytolytic and latent stages of immune response to SRBC antigen, <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> expression in the spleen was comparatively higher than in the thymus and the height of transcriptional activity was associated with the cytolytic stage</span><i><span style="font-family:Verdana;">. </span></i><span style="font-family:Verdana;">The birds of high titre at both the cytolytic and the latent responses had higher mRNA expression.</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">This study concluded that <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> gene expression in the Nigerian indigenous chicken was induced at the cytolytic stage and repressed at the latent stage. During avian infections, the category of high immune response birds would perform better than the low immune response counterpart;and the protective response that <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> gene <span style="font-family:Verdana;">offers </span><span style="font-family:Verdana;">will be repressed from one time point to the other.</span>展开更多
为筛选太行鸡脾脏组织中绵羊红细胞(sheep red blood cell,SRBC)免疫应答的关键基因和信号通路,本研究采用高通量测序技术,构建了太行鸡SRBC免疫组和对照组脾脏组织的数字基因表达谱,对差异表达的基因进行筛选与注释、GO分析和通路的功...为筛选太行鸡脾脏组织中绵羊红细胞(sheep red blood cell,SRBC)免疫应答的关键基因和信号通路,本研究采用高通量测序技术,构建了太行鸡SRBC免疫组和对照组脾脏组织的数字基因表达谱,对差异表达的基因进行筛选与注释、GO分析和通路的功能显著性富集以及差异基因编码蛋白的互作网络分析。结果表明:太行鸡在免疫6 d后的SRBC抗体滴度平均值为7.653;与对照组相比,差异倍数在2倍以上的共有1 108个基因,其中496个上调表达,612个下调表达,412个上调基因只在免疫组表达,537个下调基因仅在对照组表达;上调基因主要涉及T细胞激活、淋巴细胞增殖和单核细胞增殖等生物学过程,下调基因主要参与免疫效应、防御效应、炎性效应、先天性免疫效应生物学过程;在分子注释系统数据库中注释到的免疫相关的显著调控通路有12条,包括抗原的加工递呈、Toll样受体信号通路、沙门氏菌感染、HTLV-Ⅰ感染和单纯疱疹病毒感染等;56个差异基因编码的蛋白产物存在相互作用,其中16个基因位于网络中心节点,部分差异基因与SRBC相关QTL重叠。初步认为抗原加工与递呈的MHCⅡ类分子途径、T细胞激活等调控通路及RAG2、FOS、MHC B-LBⅢ、HSP90AA1、CXCR4和HSPA8等基因可能是参与调控太行鸡SRBC免疫应答的重要信号通路和基因,但其功能和影响还有待于深入研究。展开更多
文摘An economically-important trait in poultry for which gene identification <span style="font-family:Verdana;">continues to be a challenge is immune response. The objective of the study </span><span style="font-family:Verdana;">was</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">to quantitate the expression of major histocompatibility complex (MHC) class II <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> gene at cytolytic and latent immune response stages in Nigerian indigenous chickens. </span><span style="font-family:Verdana;">A total of 108 Nigerian indigenous chickens (NIC) were sourced across the South-western states in Nigeria. The birds were inoculated with sheep red blood cells (SRBC), after which blood samples were obtained (5 days post-inoculation) and antibody haemagglutination test was carried out to place the birds into groups of high and low antibody titre levels.</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">The categorisation of the birds resulted in six groups of normal feather high, normal feather low, naked neck high, naked neck low, frizzle feather high and frizzle feather low antibody groups. </span><span style="font-family:Verdana;">A total of 48 chicks w</span></span><span style="font-family:Verdana;">ere</span><span style="font-family:Verdana;"> selected from the progeny for gene expression studies. </span><span style="font-family:Verdana;">Surgical excision of thymus and spleen was carried out for the detection of cytolytic and latent responses of the birds. β-actin was used as the endogenous control and the critical threshold method</span><span> </span><span style="font-family:Verdana;">(2<span style="white-space:nowrap;"><sup></sup></span><sup></sup></span><span style="font-family:;" "=""><span style="font-family:Verdana;"><sup>–ΔΔCт</sup><span style="white-space:nowrap;"></span>) was carried out for the determination of fold change. The fold change of spleen tissue expression at cytolytic immune response of the birds was 30,362.44 compared to latent response 294.07;and the fold change of thymus expression at cytolytic immune response of the birds was 51.98 compared to latent response 5.24</span><i><span style="font-family:Verdana;">. </span></i><span style="font-family:Verdana;">At both cytolytic and latent stages of immune response to SRBC antigen, <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> expression in the spleen was comparatively higher than in the thymus and the height of transcriptional activity was associated with the cytolytic stage</span><i><span style="font-family:Verdana;">. </span></i><span style="font-family:Verdana;">The birds of high titre at both the cytolytic and the latent responses had higher mRNA expression.</span><span style="font-family:;" "=""> </span><span style="font-family:;" "=""><span style="font-family:Verdana;">This study concluded that <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> gene expression in the Nigerian indigenous chicken was induced at the cytolytic stage and repressed at the latent stage. During avian infections, the category of high immune response birds would perform better than the low immune response counterpart;and the protective response that <i></i></span><i><i><span style="font-family:Verdana;">BLB2</span></i><span style="font-family:Verdana;"></span></i> gene <span style="font-family:Verdana;">offers </span><span style="font-family:Verdana;">will be repressed from one time point to the other.</span>