A set of allele-specific oligonucleotide (ASO) probes used for detecting all 18 β-tha-lassemia mutations found in Chinese was immobilized on two strips of Biodyne C membrane;one containing 7 pairs of oligonucleotide ...A set of allele-specific oligonucleotide (ASO) probes used for detecting all 18 β-tha-lassemia mutations found in Chinese was immobilized on two strips of Biodyne C membrane;one containing 7 pairs of oligonucleotide probes specific for the most commonly found mutant al-leles,and the other containing the remaining 11 pairs of ASO_s specific for the less commonlyfound.The membranes were hybridized with β-globin sequences amplified by polymerase chainreaction (PCR) with biotinylated primers,and then treated with Streptavidin-POD conjugateand substrates for color development.The method has been applied successfully to the detectionof all 18 Chinese β-thalassemia mutations and prenatal diagnosis of two high-risk pregnancies ofβ-thalassemia.Patients with homozygous,heterozygous and compound heterozygous alleles ofthese mutations and normal individuals could be easily distinguished by the present method.Us-ing the immobilized-probe format (reverse dot blot),it was able to screen simultaneously multi-ple β-thalassemia mutations of a DNA sample by performing hybridization only once.This assayis simple,rapid and independent of radio-isotopes and can be appplied for all 18 β-thalassemiamutations so far found in Chinese population.It is considered that this method may be usefulfor gene frequency investigation of large numbers of β-thalassemia DNA samples and used as aroutine method in the clinic laboratory.展开更多
采用抑制性差减杂交技术(SSH)成功构建了罗非鱼O reochrom is nilotica被链球菌Streptococcus iniae疫苗免疫前后正、反两个淋巴细胞cDNA差减文库,富集了免疫过程中表达谱发生变化的淋巴细胞基因,并对文库进行了斑点杂交筛选、测序和EST...采用抑制性差减杂交技术(SSH)成功构建了罗非鱼O reochrom is nilotica被链球菌Streptococcus iniae疫苗免疫前后正、反两个淋巴细胞cDNA差减文库,富集了免疫过程中表达谱发生变化的淋巴细胞基因,并对文库进行了斑点杂交筛选、测序和ESTs初步分析。结果表明:文库富集了高丰度的差异表达基因,阳性率较高。正向文库中筛选得到21个免疫期间表达丰度上调的基因,其中1个基因与罗非鱼已知基因具有相似性,10个基因与其他鱼类已知基因相似,1个基因与其他物种已知基因具有相似性,9个为未知新基因;负向文库中筛选得到24个免疫期间表达丰度下调的基因,其中3个与罗非鱼已知基因具有相似性,15个与其他鱼类已知基因相似,6个为未知新基因。进一步功能注解发现,正向文库功能基因包括免疫信号传导相关蛋白、防御相关蛋白、肿瘤免疫相关蛋白和淋巴细胞相关蛋白,这些基因免疫后表达丰度升高,提高了机体免疫抵抗力。负向文库功能基因包括细胞免疫相关蛋白、感染相关蛋白和肿瘤发生相关蛋白,这些基因免疫后表达丰度降低,可以降低机体感染和发病几率。展开更多
文摘A set of allele-specific oligonucleotide (ASO) probes used for detecting all 18 β-tha-lassemia mutations found in Chinese was immobilized on two strips of Biodyne C membrane;one containing 7 pairs of oligonucleotide probes specific for the most commonly found mutant al-leles,and the other containing the remaining 11 pairs of ASO_s specific for the less commonlyfound.The membranes were hybridized with β-globin sequences amplified by polymerase chainreaction (PCR) with biotinylated primers,and then treated with Streptavidin-POD conjugateand substrates for color development.The method has been applied successfully to the detectionof all 18 Chinese β-thalassemia mutations and prenatal diagnosis of two high-risk pregnancies ofβ-thalassemia.Patients with homozygous,heterozygous and compound heterozygous alleles ofthese mutations and normal individuals could be easily distinguished by the present method.Us-ing the immobilized-probe format (reverse dot blot),it was able to screen simultaneously multi-ple β-thalassemia mutations of a DNA sample by performing hybridization only once.This assayis simple,rapid and independent of radio-isotopes and can be appplied for all 18 β-thalassemiamutations so far found in Chinese population.It is considered that this method may be usefulfor gene frequency investigation of large numbers of β-thalassemia DNA samples and used as aroutine method in the clinic laboratory.
文摘采用抑制性差减杂交技术(SSH)成功构建了罗非鱼O reochrom is nilotica被链球菌Streptococcus iniae疫苗免疫前后正、反两个淋巴细胞cDNA差减文库,富集了免疫过程中表达谱发生变化的淋巴细胞基因,并对文库进行了斑点杂交筛选、测序和ESTs初步分析。结果表明:文库富集了高丰度的差异表达基因,阳性率较高。正向文库中筛选得到21个免疫期间表达丰度上调的基因,其中1个基因与罗非鱼已知基因具有相似性,10个基因与其他鱼类已知基因相似,1个基因与其他物种已知基因具有相似性,9个为未知新基因;负向文库中筛选得到24个免疫期间表达丰度下调的基因,其中3个与罗非鱼已知基因具有相似性,15个与其他鱼类已知基因相似,6个为未知新基因。进一步功能注解发现,正向文库功能基因包括免疫信号传导相关蛋白、防御相关蛋白、肿瘤免疫相关蛋白和淋巴细胞相关蛋白,这些基因免疫后表达丰度升高,提高了机体免疫抵抗力。负向文库功能基因包括细胞免疫相关蛋白、感染相关蛋白和肿瘤发生相关蛋白,这些基因免疫后表达丰度降低,可以降低机体感染和发病几率。
