Reference: Keil RL and McWilliams AD (1993) A gene with specific and global effects on recombination of sequences from tandemly repeated genes in Saccharomyces cerevisiae. Genetics 135(3):711-8

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Abstract


The preservation of sequence homogeneity and copy number of tandemly repeated genes may require specific mechanisms or regulation of recombination. We have identified mutations that specifically affect recombination among natural repetitions in the yeast Saccharomyces cerevisiae. The rrm3 mutation stimulates mitotic recombination in the naturally occurring tandem repeats of the rDNA and copper chelatin (CUP1) genes. This mutation does not affect recombination of several other types of repeated genes tested including Ty elements, mating type information and duplications created by transformation. In addition to stimulating exchange among the multiple CUP1 repeats at their natural chromosomal location, rrm3 also increases recombination of a duplication of CUP1 units present at his4. This suggests that the RRM3 gene may encode a sequence-specific factor that contributes to a global suppression of mitotic exchange in sequences that can be maintained as tandem arrays.

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Journal Article | Research Support, U.S. Gov't, P.H.S.
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Keil RL, McWilliams AD
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