心脏特异性高表达hAPE1基因小鼠的构建与鉴定

本研究拟建立心脏特异性表达hAPE1转基因小鼠,为研究hAPE1基因功能及其突变与心脏发育和心血管疾病的关系提供工具动物。将人APE1(human APE1,hAPE1)基因插入到心脏特异性启动子α-肌球蛋白重链(α-MHC)下游,构建了心肌细胞特异性表达hAPE1的转基因表达载体,显微注射法导入C57BL/6J小鼠受精卵中,经胚胎移植获得转基因首建者小鼠,建立hAPE1转基因小鼠,PCR鉴定转基因小鼠基因型,Western blotting鉴定h APE1蛋白在心脏中的表达并筛选高表达的转基因品系。研究表明,将含有心肌细胞特异性α-MHC启动子和hAPE1基因的转基因载体进行显微注射于小鼠胚胎中,接着将胚胎移植入假孕母鼠的输卵管中发育,建立了心脏组织特异性高表达hAPE1转基因小鼠品系,获得子代小鼠40只。PCR检测发现有15只小鼠在其基因组上整合有hAPE1基因,Western blotting检测hAPE1在这些小鼠心脏中高度特异性表达。本研究成功获得了在小鼠心肌细胞中特异性表达hAPE1的转基因小鼠,为研究基因在心脏发育与相关疾病中的功能提供了有利的工具。     

波尔山羊杂交后代及其亲本随机扩增多态DNA研究

利用随机扩增多态DNA技术研究了波尔山羊、唐山奶山羊、青龙本地山羊以及波尔山羊与这两个山羊群体杂交后代共计128个山羊个体的随机扩增多态DNA。结果表明：（1）总群体平均遗传多样性指数（Hsp）为0.6974,群体遗传分化指数为0.9706,山羊群体间平均遗传距离指数（0.1314～0.2052）明显大于群体内的相应值（0.0582～0.1440）,上述结果说明,所研究山羊群体不仅具有较为丰富的遗传多样性,而且其核基因组遗传变异主要存在于群体间。（2）山羊群体间的分子聚类关系与各群体间的亲缘关系基本一致。 Abstract:The random amplified polymorphic DNA（RAPD）of 128 individuals was studied,which were from Boer goat, Tangshan dairy goat,Qinglong native goat and their hybrids crossbred with Boer goat.The average index of genetic polymorphism for whole population（Hsp）and the index of genetic differentiation were 0.6974 and 0.9706,respectively.The average index of genetic distance between populations（0.1314～0.2052）was significantly higher than that within populations（0.0582～0.1440）.All of these indicated that the genetic polymorphism was not only abundant,but also the genetic variation was mainly existed between goat populations.The molecular dendrogram among goat populations was in accord with their genetic relationship.