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A new deal for Holliday junctions

BLM, the helicase implicated in Bloom's syndrome, and its yeast counterpart Sgs1 function in complexes with a type I topoisomerase to resolve double Holliday junctions to form non-crossover products. These data provide a direct explanation for the highly elevated sister chromatid exchange frequency in Bloom's syndrome cells.

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Figure 1: Elevated sister chromatid exchange in Bloom's cells.
Figure 2: Function of BLM-TOPO IIIa/Sgs1-Top3 in homologous recombination.

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Heyer, WD. A new deal for Holliday junctions. Nat Struct Mol Biol 11, 117–119 (2004). https://doi.org/10.1038/nsmb0204-117

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