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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Hdf1, a yeast Ku-protein homologue, is involved in illegitimate recombination, but not in homologous recombination.

Hdf1 is the yeast homologue of the mammalian 70 kDa subunit of Ku-protein, which has DNA end-binding activity and is involved in DNA double-strand break repair and V(D)J recombination. To examine whether Hdf1 is involved in illegitimate recombination, we have measured the rate of deletion mutation caused by illegitimate recombination on a plasmid in an hdf1 disruptant. The hdf1 mutation reduced the rate of deletion formation by 20-fold, while it did not affect mitotic and meiotic homologous recombinations between two heteroalleles or homologous recombination between direct repeats. Hence Hdf1 participates in illegitimate recombination, but not in homologous recombination, in contrast to Rad52, Rad50, Mre11 and Xrs2, which are involved in both homologous and illegitimate recombination. The illegitimate recombination in the hdf1 disruptant took place between recombination sites that shared short regions of homology (1-4 bp), as was observed in the wild-type. Based on the DNA end-binding activity of Hdf1, we discuss models in which Hdf1 plays an important role in the late step of illegitimate recombination.[1]


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