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解偶联蛋白1、2和3基因在中国西门塔尔牛组织器官中的表达水平及其与胴体品质关系分析

DOI: 10.7668/hbnxb.2014.04.019, PP. 116-120

Keywords: 解偶联蛋白,组织器官,基因表达,胴体品质

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Abstract:

为获得中国西门塔尔牛解偶联蛋白(Uncouplingproteins,UCPs)ucp1、ucp2、ucp3基因的组织表达谱,揭示该基因与能量代谢的关系,探索调控肉牛脂肪沉积的关键基因表达规律,筛选影响肉牛肥育性状的候选基因。以20头中国西门塔尔牛为试验材料,提取其15种组织(肝脏、淋巴、肋间肉、肩肉、脾脏、肾脏、背最长肌、肺、心脏、肠脂、网脂、睾丸、小肠、胰脏、背膘)总RNA,设计合成ucp1、ucp2、ucp3基因的引物,以牛β-actin基因为内参,利用实时荧光定量PCR技术,检测ucp1、ucp2、ucp3基因的mRNA在以上各组织中的表达。结果表明,ucp1、ucp2、ucp3基因在睾丸、小肠、心脏、胰腺等组织、器官中均有不同程度的表达,ucp1在背膘中高表达,胰脏、小肠、睾丸、网脂、肠脂、心脏中度表达,在其他组织中低表达;ucp2在睾丸中高表达,肺脏、肝脏、背膘中度表达,在其他组织中低表达;ucp3在背最长肌、肋间肉、肩肉中高表达,肺脏中度表达,在其他组织中低表达。经相关分析表明:眼肉中ucp3基因的表达量与肌内脂肪和背膘厚关系不大,而与眼肌面积呈正相关(r=0.788)。结论:中国西门塔尔牛ucp1、ucp2、ucp3基因的表达,具有组织特异性;ucp1、ucp2、ucp3在不同组织的表达差异,可能与其在不同组织中的功能有关;ucp3基因可作为与胴体性状相关的候选基因。

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