A fission yeast chromosome can replicate autonomously in mouse cells
- PMID: 3475186
- DOI: 10.1016/0092-8674(87)90493-4
A fission yeast chromosome can replicate autonomously in mouse cells
Abstract
To test the functional capacity of a fission yeast chromosome in mouse cells, a strain of the fission yeast Schizosaccharomyces pombe, ED628 Int5, was constructed. A plasmid bearing the SV2NEO gene, which can confer G418 resistance to mouse cells, was integrated at the ura4 locus on S. pombe chromosome III. S. pombe Int5 chromosomes were introduced into mouse C127 cells by PEG-facilitated protoplast fusion. Here we describe two independent G418-resistant cell lines with distinct growth characteristics, F1.1 and F7.1, and examine the structure of material derived from S. pombe Int5 chromosome III in these lines. F1.1 is shown to contain a single rearranged block of chromatin from S. pombe chromosome III integrated into a mouse chromosome, maintained in the absence of selection. In contrast, the data for F7.1 are consistent with the presence of linear, unintegrated copies of S. pombe chromosome III, which are apparently intact and maintained in an unstable but autonomous state. The unstable maintenance of this chromosome may be due to defective centromere function leading to missegregation at mitosis or to over- or underreplication.
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