以胞质分裂阻滞法研究女性年龄与体细胞中 21号染色体分离异常的关系

21三体是人类最常见的先天性疾病，约95%患儿的超数21号染色体来源于母亲，且随母龄增加患儿出生率也随之增加。本文首次运用胞质分裂阻滞法(CB法)对不同年龄女性体细胞进行荧光原位杂交，对其21号染色体的分离情况进行分析。结果表明，随年龄的增加，女性体细胞中21号染色体不分离也随之增加，但21号染色体丢失无年龄效应, 且21号染色体不分离频率远高于其丢失。该结果表明，女性体细胞中21号染色体不分离与生殖细胞同样存在年龄效应。 Abstract　　Trisomy 21 is the most common genetic desease in human. More than 90% is derived from mother. With the advancing of mother's age, the frequency of trisomy 21 is increasing. We detected the relation between chromosome 21 missegregation and age in cytokinesis-blocked female lymphocytes by　in situ　hybridization with chromosome 21 specfic probe. We have found that the age effect also exists in female somatic cells as in gamets.

Detection the Relation Between Chromosome 21 Missegregation and Age in Cytokinesis-blocked Female Lymphocytes by in situ Hybridization