Reference: Aguilera A (1988) Mitotic gene conversion of large DNA heterologies in Saccharomyces cerevisiae. Mol Gen Genet 211(3):455-8

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Abstract


Gene conversion of large DNA heterologous fragments has been shown to take place efficiently in Saccharomyces cerevisiae. It has been found that a 2.6 kb LEU2 DNA fragment in a multicopy plasmid was replaced by a 3.1 kb PGI1 chromosomal DNA fragment, when both fragments were flanked by homologous DNA regions. Gene conversion was asymmetric in a total of 481 recombinants analyzed. In contrast, truncated PGI1 or LEU2 genes in multicopy plasmids, gave no recombinants that restored a complete plasmid copy of these genes in a total of 242 recombinants studied, confirming that a conversion tract is disrupted by a heterologous region. The asymmetry of the events detected suggest that gene conversion of large DNA heterologies involves a process whereby a gap first covers one heterologous fragment and then this is followed by new DNA synthesis using the other heterologous fragment as a template. Therefore, it is likely that large DNA heterologies are converted by a double-strand gap repair mechanism.

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Journal Article | Research Support, Non-U.S. Gov't
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Aguilera A
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