Spandidos D A, Siminovitch L
Proc Natl Acad Sci U S A. 1977 Aug;74(8):3480-4. doi: 10.1073/pnas.74.8.3480.
Codominant mutations to methotrexate and ouabain resistance in Chinese hamster ovary cells can be transferred to recipient Chinese hamster ovary cells by isolated metaphase chromosomes. For methotrexate, both the structural change and the increased activity of dihydrofolate reductase (5,6,7,8-tetrahydrofolate:NADP+ oxidoreductase EC 1.5.1.3), characteristic of the donor cells, are observed in the transferents (cells that carry and express functions derived by chromosome transfer). The transferents are unstable in the absence of selection although stable clones can be isolated. From results obtained by fractionation of chromosomes and transfer to recipients, the methotrexate and ouabain markers can be assigned to the middle and large size-classes of chromosomes, respectively. By fractionation and transfer of chromosomes, from transferents to new recipients, evidence has been obtained that chromosome integration is not restricted to a particular chromosomal site in the recipient.
中国仓鼠卵巢细胞中对甲氨蝶呤和哇巴因耐药的共显性突变可通过分离的中期染色体转移至受体中国仓鼠卵巢细胞。对于甲氨蝶呤,在转移细胞(通过染色体转移携带并表达衍生功能的细胞)中可观察到供体细胞特有的结构变化以及二氢叶酸还原酶(5,6,7,8 - 四氢叶酸:NADP +氧化还原酶,EC 1.5.1.3)活性增加。在无选择条件下,转移细胞不稳定,不过可分离出稳定克隆。通过对染色体进行分级分离并转移至受体,甲氨蝶呤和哇巴因标记分别可定位到中等大小和大尺寸的染色体类别。通过对染色体进行分级分离并从转移细胞转移至新受体,已获得证据表明染色体整合并不局限于受体中的特定染色体位点。