Transformation of ciliates with a circular plasmid derived from an overamplified macronuclear DNA of Stylonychia lemnae

H. Endoh
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引用次数: 1

Abstract

Transformation of ciliates was attempted with a circular plasmid containing a chromosomal DNA of the hypotrichous ciliate Stylonychia lemnae by calcium phosphate-mediated transfection. The plasmid, designated Tubingen-3, was constructed from a bacterial plasmid, a gene for neomycin resistance derived from a vector for the cellular slime mold Dictyostelium, and a 1.2 kb macronuclear chromosomal DNA of Stylonychia. Transformants were obtained at a frequency of one per 104 to 105 of input cells in Stylonychia lemnae and at a lower frequency, one per 10 6, in Tetrahymena thermophila. The vector when simply linearized by digestion with restriction enzymes failed to give transformants, whereas when the vector was linearized so as to have short telomeric sequences at both ends, effective transformation was again observed. The Dictyostelium vector, pCERF DRpl4, with a segment of DNA that contained the putative origin of replication was found, unexpectedly, to be effective in transforming Stylonychia cells. The origin of replication in Stylonychia and Dictyostelium might thus be functionally similar.
用Stylonychia lenae巨核DNA衍生的环状质粒转化纤毛虫
用含有次毛纤毛虫(Stylonychia lenae)染色体DNA的环状质粒,通过磷酸钙介导转染,对纤毛虫进行了转化。该质粒命名为Tubingen-3,由细菌质粒、细胞黏菌Dictyostelium载体衍生的新霉素耐药基因和Stylonychia的1.2 kb大核染色体DNA构建而成。在Stylonychia lemnae中,每104到105个输入细胞中有一个转化体,而在嗜热四膜虫中,每106个输入细胞中有一个转化体。用限制性内切酶对载体进行简单的线性化处理,不能得到转化子,而将载体进行线性化处理,使两端的端粒序列较短,再次观察到有效的转化。不料,Dictyostelium载体pCERF DRpl4的DNA片段包含了假定的复制起源,被发现能有效地转化Stylonychia细胞。Stylonychia和Dictyostelium的复制起源可能在功能上相似。
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