摘要
为提高检测21号染色体数目和结构异常的精确性,应用digoxigenin-11-dUTP通过缺口平移法标记D13Z1/D21Z1和6个柯斯质粒(Cosmid)DNA克隆,将标记后的D13Z1/D21Z1和6个柯斯质粒DNA克隆双探针与正常二倍体细胞系染色体进行荧光原位杂交(FISH),结合Q显带方法将6个柯斯质粒DNA克隆定位于21q22;用柯斯质粒DNA克隆探针与两个已知的平衡易位细胞系GM9542和8327L的染色体进行荧光原位杂交,检测并分析杂交信号在两个平衡易位细胞系染色体上的分布,结果表明柯斯质粒DNA克隆精确定位于21q22.2,6个柯斯质粒DNA克隆定位结果一致。
D13Z1/D21Z1and6cosmidDNAcloneswerelabeledwithdigoxigenin-11-dUTPbynicktranslation.Fluoresenecinsituhybridization(FISH)wascarriedoutbetweenthelabeledD13Z1/D21Z1andcosmidDNAcloneprobesandchromosomeofthenormaldiploidcelline,andcombinedwithQ-bandingtechnique;the6cosmidDNAcloneswerelocatedon21q22.Furthermore,FISHwasper-formedbetweenthecosmidDNAcloneprobesandchromosomesofthetwocellines(GM9542and8327L)withknownbalancedtranslocation.Detectionofthehybridizationsignalandanalysisofitsdis-tributioninthechromosomesofthetwocellineswithknownbalancedtranslocationshowedthatthecosmidDNAclonewaspreciselylocatedon21q22.2andthe6cosmidDNAcloneshadthesameloca-tion.
出处
《中华医学遗传学杂志》
CAS
CSCD
北大核心
1996年第6期329-332,共4页
Chinese Journal of Medical Genetics
关键词
荧光原位杂交
区域定位
DNA
柯斯质粒
染色体
FluoresenecinsituhybridizationBalancedtranslocationNicktranslationRegionallocalization