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- Title
Recombination at his-3 in Neurospora Declines Exponentially With Distance from the Initiator, cog.
- Authors
Yeadon, P. Jane; Koh, L.Y.; Bowring, F.J.; Rasmussen, J.P.; Catcheside, D.E.A.
- Abstract
By deletion of 1.8 kb of sequence between cog[SUPL] and his-3 and replacement with sequences of different lengths, we have generated a set of Neurospora strains in which the distance between cog[SUPL] and the site at which recombination is selected varies from 1.7 to nearly 6 kb. Each of the manipulated strains includes cog[SUPL], a highly active recombination hotspot, and rec-2, thus allowing high-frequency recombination. In addition, each is a his-3 mutant, either K26 or K480. The frequency of His[SUP+] recombinants in progeny of these crosses is inversely proportional to the distance between his-3 and cog. Specifically, there is a linear relationship between log[SUB10] (recombination frequency) and the distance in base pairs, indicating that as distance decreases, the rate of interallelic recombination increases exponentially. An exponential relationship between distance separating markers and the chance of co-conversion has been found in both Drosophila and fission yeast, indicating that the extension of recombination events may be a stochastic process in most organisms. On the basis of these and additional data presented in this article, we conclude that recombination is initiated at cog[SUPL] in >17% of meioses, that most conversion tracts are very short, and that few extend >14 kb.
- Subjects
NEUROSPORA; GENETIC recombination
- Publication
Genetics, 2002, Vol 162, Issue 2, p747
- ISSN
0016-6731
- Publication type
Article
- DOI
10.1093/genetics/162.2.747