作　　者： ; ; ; ; ; ; ; (陈宏）;

机构地区： 西北农林科技大学动物科技学院陕西省农业分子生物学重点实验室

出　　处： 《遗传》 2003年第5期511-516,共6页

摘　　要： 以IGFBP3基因作为秦川牛(Bostaurus)部分屠宰指标的侯选基因,在对60头秦川牛的IGFBP3基因进行PCR RFLP和序列分析的基础上,对秦川牛群体中IGFBP3基因座等位基因和基因型频率的分布及其与秦川牛部分屠宰性状的关系进行了分析。结果发现,在秦川牛群体中,651bp的PCR产物经过限制性内切酶HaeIII消化后,表现出3种基因型,其中等位基因A、B及3种基因型AA、AB、BB的频率分别为0.84、0.16和0 70、0.28、0.02。经序列分析发现,第299位的C→A颠换(GGCC变成了GGAC)导致了1个HaeIII限制性酶切位点的丢失而产生了该基因座多态性。在所研究的群体中,该多态基因座处于Hardy Weinberg平衡状态(P>0 05)。对13头24月龄秦川牛进行屠宰分析,发现不同基因型对秦川牛部分屠宰指标有一定影响,AA、AB及BB型个体的屠宰率、净肉率及西冷、牛柳、眼肉和嫩肩肉的产率逐渐降低,但差异不显著(P>0.05);AA型个体的眼肌面积大于BB型个体(P<0.05),AB型和BB型个体胴体脂肪含量高于AA型个体(P<0.01)。 DNA samples from 60 Qinchuan cattle (Bos taurus) were analyzed with PCRRFLPs and sequencing for insulinlike growth factor binding protein 3 (IGFBP3) gene.Fragments of 651 bp were amplified with two primers and the products of PCR were digested with restriction endonuclease HaeIII.The produced fragments showed three genotypes,namely AA,AB and BB after electrophoresis.Frequencies of the genotype AA,AB,BB and allele A,B were 0.7,0.28,0.02,and 0.84,0.16,respectively.Sequence analysis showed that a transversion of C→A at 299 nt resulted in loss of the cleaved site of restriction endonuclease HaeIII and produced this polymorphism.This polymorphic locus of IGFBP3 gene was at HardyWeinberg equilibrium (P>0.05).The genotypes of AA,AB,BB slightly affected several slaughter and carcass traits of Qinchuan cattle.Dressing percentage,net meat percentage,striplion percentage,tenderloin percentage,ribeye percentage and tender shoulder percentage were decreased with the genotypes of AA,AB and BB in Qinchuan cattle,but it was not significant (P>0.05).Average ribeye area in individuals of AA genotype was significantly higher than that in individuals of BB genotype (P<0.05),and beef fat content in individuals of genotype AB and BB was significantly higher than that in individuals of AA genotype (P<0.01).

关 键 词： 基因 多态性 秦川牛 屠宰性状 相关性 胰岛素样生长因子结合蛋白

领　　域： [农业科学] [农业科学]