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Mol Cell Biol. 1985 December; 5(12): 3451-3457

Deletions extending from a single Ty1 element in Saccharomyces cerevisiae.

K M Downs, G Brennan and S W Liebman

ABSTRACT

Chromosomal rearrangements associated with one Ty1 element in the iso-1-cytochrome c (CYC1) region of Saccharomyces cerevisiae yeast cells were examined. Most of the rearrangements were deletions of the three linked genes, CYC1, OSM1, and RAD7, and resulted from recombination involving the single Ty1 element and a solo delta in the same orientation. These deletions differed by the number of Ty1 elements (zero, one, or two) remaining after deletion and by restriction site heterogeneities associated with these elements. A single Ty1 element remained at the deletion junction point much more frequently than no Ty1. Apparently the Ty1-associated delta element nearer to the solo delta was involved more often in recombination than the more distal Ty1-associated delta element. The restriction site data implicate gene conversion and suggest that site-specific recombination within the deltas, if occurring, is not the only mechanism of delta-delta recombination. Three other rearrangements bore deletions which began at the end of the Ty1 element and extended into regions not bearing Ty1 or delta sequences. Two of these deletions eliminated 7 kilobases of DNA, although they differed by an associated reciprocal translocation. The third involved a deletion of 14.7 kilobases of DNA associated with an overlapping inversion.

Mol Cell Biol. 1985 December; 5(12): 3451-3457




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