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A yeast intrachromosomal recombination system based on an inverted repeat has been designed to examine mitotic gene conversion tract length and the association of crossing over with gene conversion as a function of the conversion tract length. Short conversion tracts are found to be preferentially noncrossover while conversion tracts longer than 1.16 kb show a 50% association with crossover. Mutation in the excision repair gene RAD1 leads to a reduction in conversion tracts of at least 1.16 kb and a reduction in crossovers associated with conversion, regardless of the length of the conversion tract. Mutation in the excision repair gene RAD3, which encodes a DNA helicase, also leads to a reduction in conversion tracts of at least 1.16 kb, but has no effect on the frequency of associated crossovers. The roles of RAD1 and RAD3 in recombination are discussed.

genetics

Yeast intrachromosomal recombination: long gene conversion tracts are preferentially associated with reciprocal exchange and require the RAD1 and RAD3 gene products.