Abstract
The temperature-sensitive (ts) mouse L-cell, ts AlS9, is defective in a gene required for nuclear DNA replication early in the S phase of the cell cycle. Human DNA sequences were introduced into ts AlS9 cells together with the plasmid pSV2neo, which can confer resistance to the drug geneticin. Cotransformants, expressing both the plasmid-derived neomycin gene and the transferred human AlS9 gene, were selected for growth in the presence of the drug at the nonpermissive temperature (npt). The resulting transformants retained a common set of human-specific Alu repetitive DNA sequences. These are likely to be accommodated within, or in proximity to, the transferred human AlS9 gene. The results obtained provide the basis for cloning human genes required for DNA replication.
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