不同地方乌骨鸡种群遗传多样性的微卫星DNA分析

利用家禽基因组中的10个微卫星标记,对位于不同地区6个乌骨鸡种群的等位基因频率、各群体的遗传杂合度、群体间的遗传距离等进行了分析,并根据遗传距离对这几个乌骨鸡种群进行了聚类分析。结果表明,各乌骨鸡群体的遗传多样性较为丰富,并具有较高的选择潜力。各乌骨鸡种群间有一定的遗传距离,UPGMA聚类分析表明,黑凤乌骨鸡与白凤乌骨鸡最先被聚在一起,四川山地乌骨鸡黑羽系与川南山地乌骨鸡被聚为一类,草科鸡与旧院黑鸡被聚为一类。

克隆西农莎能奶山羊的微卫星DNA分析

目的利用微卫星DNA技术对通过体细胞克隆技术获得的两只西农莎能奶山羊进行鉴定。方法提取两只克隆西农莎能奶山羊、两只受体西农莎能奶山羊母羊、西农莎能奶山羊供体细胞和两只对照组西农莎能奶山羊母羊的基因组DNA,通过5对具有显著多态性差异的引物扩增微卫星DNA序列,并对其进行微卫星DNA分析。结果两只克隆西农莎能奶山羊和供体细胞的基因型完全一致,受体母羊和对照组母羊的微卫星DNA多态性则与前两者均不相同。结论两只克隆西农莎能奶山羊基因组DNA来源于供体细胞。

克隆波尔山羊的微卫星DNA鉴定

目的 :利用微卫星DNA技术进行体细胞克隆后获得个体的鉴定。方法 :提取正常山羊、供核波尔山羊、本地受体山羊及克隆个体的基因组DNA ,通过设计微卫星DNA多态PCR引物扩增微卫星DNA序列并对之进行微卫星DNA鉴定。结论 :通过微卫星DNA序列的扩增 ,证明克隆个体为供核波尔山羊的克隆。

Genetic diversity and differentiation of masu salmon(Oncorhynchus masou masou) between and within cultured populations inferred from microsatellite DNA analysis

Masu salmon,Oncorhynchus masou masou,is one of the most valuable fishery species that has been introduced to China,though to date no studies on the genetic diversity and genetic relationship among hatchery populations has been performed with molecular markers.We undertook such a study and sampled 120 individuals from three hatchery stocks and analyzed 20 microsatellite loci.All loci were polymorphic and a total of 91 alleles were detected.A relatively low level of genetic diversity was revealed with effective number of allele of 3.1094,3.3299 and 3.1894 and expected heterozygosity of 0.6600,0.6648 and 0.6638 in the three stocks,respectively.Deviations from Hardy-Weinberg equilibrium were found due to heterozygote deficit.Accordingly,evidence of genetic bottlenecks were found in the three stocks.An individual assignment test demonstrated that 85% of individuals were correctly assigned into their original stocks.Pairwise Fst revealed that significant differentiation occurred between these three stocks.The results of the study indicated that disequilibrium of genetic structure and differentiation has occurred in all three stocks.This information collectively provides a basis for measures to avoid of loss of genetic diversity and introgression in Chinese aquaculture.

酵母菌的5种鉴定方法

介绍了5种酵母菌的鉴定方法,API 20C AUX系统、傅里叶变换红外吸收光谱(FT-IR)显微分光仪、Biolog微生物鉴定系统、5.8S-ITS扩增片段的RFLP分析和微卫星DNA多态性分析。与传统方法相比具有简便、快速、适合实验室及工业化生产过程中酵母菌的鉴定。

Isolation and Characterization of Microsatellites in Snap Bean

The objectives of this study were to isolate and characterize microsatellites from a heat tolerant variety of snap bean (Phaseolus vulgaris L.) in order to generate polymorphic genetic markers linked to quantitative trait loci for heat tolerance. A genomic library contained 400-800 bp inserts was constructed and screened for the presence of (GA/CT) n and (CA/GT) n repeats. The proportion of positive clones yielded estimated of 3.72×10 4 such dinucleotide repeats per genome, roughly comparable to the abundance reported in other eukaryotic genomes. Twenty_six positive clones were sequenced. In contrast to mammalian genomes, the (GA/CT) n motif was much more abundant than the (CA/GT) n motif in these clones. The (GA/CT) n repeats also showed longer average repeat length (mean n =10.4 versus 6.5), suggesting that they are better candidates for yielding polymorphic genetic markers in the snap bean genome.

克隆绵羊——多莉(DOLLY)的研究进展

多莉 ,第一例大型克隆哺乳动物 ,由一只称为FinnDorset的 6岁母羊乳腺体细胞的基础生命物质经细胞核转移等操作而产生。成果公布后 ,持怀疑观点的学者提出 ,提供体细胞的母羊是否本身处在妊娠状态 ?推测多莉是由胚胎细胞产生 ,并非体细胞本身克隆所致。由于 6岁的母羊死于 1995年 ,只能用其冷冻保存的乳腺组织在Hannah研究中心进行细胞群体的分析。首先 ,用微卫星扩增技术 ,以三套引物进行测定 ;其次 ,进行DNA指纹分析来断定供体体细胞起源 ,以确定多莉的真实性。最后证实多莉来自成年母羊乳腺的体细胞。