The Neurospora Crassa Mus-19 Gene is Identical to the Qde-3 Gene, Which Encodes a RecQ Homologue and is Involved in Recombination Repair and Postreplication Repair

Overview

Journal Curr Genet

Specialty Genetics

Date 2003 Nov 5

PMID 14595518

Citations 19

Authors

Akihiro Kato

Yufuko Akamatsu

Yoshiyuki Sakuraba

Hirokazu Inoue

Affiliations

Soon will be listed here.

Abstract

An allele called mus-19 was identified by screening temperature-sensitive and mutagen-sensitive mutants of Neurospora crassa. The mus-19 gene was genetically mapped to a region near the end of the right arm of linkage group I, where a RecQ homologue called qde-3 had been physically mapped in the Neurospora database. Complementation tests between the mus-19 mutant and the qde-3(RIP) mutant showed that mus-19 and qde-3 were the same gene. The qde-3 genes of both mutants were cloned and sequenced; and the results showed that they have mutation(s) in their qde-3 genes. The original mus-19 and qde-3(RIP) mutants are defective in quelling, as reported for other qde-3 mutants. The mutants show high sensitivity to methyl methanesulfonate, ethyl methanesulfonate, N-methyl- N'-nitro- N-nitrosoguanidine, tert-butyl hydroperoxide, 4-nitroquinoline-1-oxide, hydroxyurea and histidine. Epistasis analysis indicated that the qde-3 gene belongs both to the uvs-6 recombination repair pathway and the uvs-2 postreplication repair pathway. The qde-3 mutation has no effect on the integration of a plasmid carrying the mtr gene by homologous recombination. In homozygous crosses, the qde-3 mutant is defective in ascospore production.

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