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Repression of mutagenesis by Rad51D-mediated homologous recombination

Homologous recombinational repair (HRR) restores chromatid breaks arising during DNA replication and prevents chromosomal rearrangements that can occur from the misrepair of such breaks. In vertebrates, five Rad51 paralogs are identified that contribute in a nonessential but critical manner to HRR p...

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Autores principales: Hinz, John M., Tebbs, Robert S., Wilson, Paul F., Nham, Peter B., Salazar, Edmund P., Nagasawa, Hatsumi, Urbin, Salustra S., Bedford, Joel S., Thompson, Larry H.
Formato: Texto
Lenguaje:English
Publicado: Oxford University Press 2006
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1390685/
https://www.ncbi.nlm.nih.gov/pubmed/16522646
http://dx.doi.org/10.1093/nar/gkl020
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author Hinz, John M.
Tebbs, Robert S.
Wilson, Paul F.
Nham, Peter B.
Salazar, Edmund P.
Nagasawa, Hatsumi
Urbin, Salustra S.
Bedford, Joel S.
Thompson, Larry H.
author_facet Hinz, John M.
Tebbs, Robert S.
Wilson, Paul F.
Nham, Peter B.
Salazar, Edmund P.
Nagasawa, Hatsumi
Urbin, Salustra S.
Bedford, Joel S.
Thompson, Larry H.
author_sort Hinz, John M.
collection PubMed
description Homologous recombinational repair (HRR) restores chromatid breaks arising during DNA replication and prevents chromosomal rearrangements that can occur from the misrepair of such breaks. In vertebrates, five Rad51 paralogs are identified that contribute in a nonessential but critical manner to HRR proficiency. We constructed and characterized a knockout of the paralog Rad51D in widely studied CHO cells. The rad51d mutant (clone 51D1) displays sensitivity to a diverse spectrum of induced DNA damage including γ-rays, ultraviolet (UV)-C radiation, and methyl methanesulfonate (MMS), indicating the broad relevance of HRR to genotoxicity. Spontaneous chromatid breaks/gaps and isochromatid breaks are elevated 3- to 12-fold, but the chromosome number distribution remains unchanged. Most importantly, 51D1 cells exhibit a 12-fold-increased rate of hprt mutation, as well as 4- to 10-fold increased rates of gene amplification at the dhfr and CAD loci, respectively. Xrcc3 irs1SF cells from the same parental CHO line show similarly elevated mutagenesis at these three loci. Collectively, these results confirm the a priori expectation that HRR acts in an error-free manner to repress three classes of genetic alterations (chromosomal aberrations, loss of gene function and increased gene expression), all of which are associated with carcinogenesis.
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spelling pubmed-13906852006-03-09 Repression of mutagenesis by Rad51D-mediated homologous recombination Hinz, John M. Tebbs, Robert S. Wilson, Paul F. Nham, Peter B. Salazar, Edmund P. Nagasawa, Hatsumi Urbin, Salustra S. Bedford, Joel S. Thompson, Larry H. Nucleic Acids Res Article Homologous recombinational repair (HRR) restores chromatid breaks arising during DNA replication and prevents chromosomal rearrangements that can occur from the misrepair of such breaks. In vertebrates, five Rad51 paralogs are identified that contribute in a nonessential but critical manner to HRR proficiency. We constructed and characterized a knockout of the paralog Rad51D in widely studied CHO cells. The rad51d mutant (clone 51D1) displays sensitivity to a diverse spectrum of induced DNA damage including γ-rays, ultraviolet (UV)-C radiation, and methyl methanesulfonate (MMS), indicating the broad relevance of HRR to genotoxicity. Spontaneous chromatid breaks/gaps and isochromatid breaks are elevated 3- to 12-fold, but the chromosome number distribution remains unchanged. Most importantly, 51D1 cells exhibit a 12-fold-increased rate of hprt mutation, as well as 4- to 10-fold increased rates of gene amplification at the dhfr and CAD loci, respectively. Xrcc3 irs1SF cells from the same parental CHO line show similarly elevated mutagenesis at these three loci. Collectively, these results confirm the a priori expectation that HRR acts in an error-free manner to repress three classes of genetic alterations (chromosomal aberrations, loss of gene function and increased gene expression), all of which are associated with carcinogenesis. Oxford University Press 2006 2006-03-06 /pmc/articles/PMC1390685/ /pubmed/16522646 http://dx.doi.org/10.1093/nar/gkl020 Text en © The Author 2006. Published by Oxford University Press. All rights reserved
spellingShingle Article
Hinz, John M.
Tebbs, Robert S.
Wilson, Paul F.
Nham, Peter B.
Salazar, Edmund P.
Nagasawa, Hatsumi
Urbin, Salustra S.
Bedford, Joel S.
Thompson, Larry H.
Repression of mutagenesis by Rad51D-mediated homologous recombination
title Repression of mutagenesis by Rad51D-mediated homologous recombination
title_full Repression of mutagenesis by Rad51D-mediated homologous recombination
title_fullStr Repression of mutagenesis by Rad51D-mediated homologous recombination
title_full_unstemmed Repression of mutagenesis by Rad51D-mediated homologous recombination
title_short Repression of mutagenesis by Rad51D-mediated homologous recombination
title_sort repression of mutagenesis by rad51d-mediated homologous recombination
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1390685/
https://www.ncbi.nlm.nih.gov/pubmed/16522646
http://dx.doi.org/10.1093/nar/gkl020
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