Isolation and characterization of polyoma virus mutants which grow in murine embryonal carcinoma and trophoblast cells - PubMed (original) (raw)
Isolation and characterization of polyoma virus mutants which grow in murine embryonal carcinoma and trophoblast cells
K Tanaka et al. EMBO J. 1982.
Abstract
Mouse trophoblast cell lines established from cultured midterm placenta and a cell line obtained from cultured blastocyst resemble trophectoderm cells. These cells are resistant to infection by wild-type polyoma virus. We have isolated six polyoma virus mutants capable of growing in trophoblast cell lines. Restriction enzyme analyses and marker rescue experiments revealed that the genetic changes necessary for the growth of these mutants ( PyTr mutants) in trophoblast cells were located in a regulatory region of the genome between the origin of viral DNA replication and the region encoding the viral structural proteins. PyTr mutants are, therefore, similar to PyEC mutants, described by others, which are able to grow in embryonal carcinoma cell lines such as F9 or PCC4. The nucleotide sequence of two independently obtained PyTr mutants has an identical 26-bp deletion from nucleotide 5131 to 5156. This deleted region is replaced by either the sequence GGGA or by viral DNA sequences that flank this deletion. PyECF9 mutants grow well in trophoblast and trophectoderm cells, but PyTr mutants do not grow in F9 or PCC4 cells.
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