DNA double-strand break repair: Genetic determinants of flanking crossing-over

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Proceedings of the National Academy of Sciences of the United States of America; (United States)

DOI:https://doi.org/10.1073/pnas.91.3.1173· OSTI ID:7009335

Kusano, Kohji; Sunohara, Yukari; Kobayashi, Ichizo; Takahashi, Noriko; Yoshikura, Hiroshi ^[1]

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1. Univ. of Tokyo (Japan)

Whether or not homologous interaction of two DNA molecules results in crossing-over of the flanking sequences is an important decision in view of genome organization. Several homologous recombination models, including the double-strand break repair models, explain this decision as choice between two alternative modes of resolution of Holliday-type intermediates. The authors have demonstrated that a double-strand gap can be repaired through gene conversion copying a homologous duplex, as predicted by the double-strand break repair models, in the RecE pathway of Escherichia coli. This gap repair is often accompanied by crossing-over of the flanking sequences. Mutations in ruvC and recG, whose products interact with Holliday structures in vitro, do not block double-strand gap repair or its association with flanking crossing-over. However, two mutations in the recJ gene, which encodes a single-strand 5[prime][yields]3[prime] exonuclease, severely decrease association of flanking crossing-over. Two mutations in the recQ gene, which encodes a helicase, moderately decrease association of flanking crossing-over by themselves and suppress the severe effect of a recJ mutation. Similar relationships of recJ and recQ mutations are observed in cell survival after ultraviolet light irradiation, [gamma]-ray irradiation, and H[sub 2]O[sub 2] treatment. The authors discuss how cooperation of the recQ gene product and the recJ gene product brings about double-strand break repair accompanied by flanking crossing-over. They also discuss how this reaction is related to repair of chromosome damages.

• OSTI ID: 7009335
• Journal Information: Proceedings of the National Academy of Sciences of the United States of America; (United States), Vol. 91:3; ISSN 0027-8424
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
DNA REPAIR
BIOLOGICAL PATHWAYS
STRAND BREAKS
REPAIR
CHEMICAL RADIATION EFFECTS
GENE MUTATIONS
GENETIC RADIATION EFFECTS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BIOLOGICAL RECOVERY
BIOLOGICAL REPAIR
GENETIC EFFECTS
MUTATIONS
RADIATION EFFECTS
550400* - Genetics
560120 - Radiation Effects on Biochemicals
Cells
& Tissue Culture