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Reference: Shibata T, et al. (1995) Multi-site-specific endonucleases and the initiation of homologous genetic recombination in yeast. Adv Biophys 31:77-91

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Abstract

The notion that homologous recombination is a regulated biological process is not a familiar one. In yeasts, homologous recombination and most site-specific ones are initiated by site-specific double-stranded breaks that are introduced within cis-acting elements for the recombination. On the other hand, yeasts have a group of site-specific endonucleases (multi-site-specific endonucleases) that have a number of cleavage sites on each DNA. One of them, Endo.SceI of S. cerevisiae, was shown to introduce double-stranded breaks at a number of well-defined sites on the mitochondrial DNA in vivo. An Endo.SceI-induced double-stranded break was demonstrated to induce homologous recombination in mitochondria. Like the case of homologous recombination of nuclear chromosomes, the double-stranded break induces gene conversion of both genetic markers flanking and in the proximity of the cleavage site, and the cleaved DNA acts as a recipient of genetic information from the uncleaved partner DNA. The 70 kDa-heat-shock protein (HSP70)-subunit of Endo.SceI and a general role of the HSP70 in the regulation of protein-folding suggest the regulation of nucleolytic activity of Endo.SceI.

Reference Type
Journal Article | Review | Review, Tutorial
Authors
Shibata T, Nakagawa K, Morishima N
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