The Rad51 paralog Rad51B promotes homologous recombinational repair

M. Takata, M. S. Sasaki, E. Sonoda, T. Fukushima, C. Morrison, J. S. Albala, S. M A Swagemakers, R. Kanaar, L. H. Thompson, S. Takeda

Research output: Contribution to journalArticle

206 Citations (Scopus)

Abstract

The highly conserved Saccharomyces cerevisiae Rad51 protein plays a central role in both mitotic and meiotic homologous DNA recombination. Seven members of the Rad51 family have been identified in vertebrate cells, including Rad51, Dmc1, and five Rad51-related proteins referred to as Rad51 paralogs, which share 20 to 30% sequence identity with Rad51. In chicken B lymphocyte DT40 cells, we generated a mutant with RAD51B/RAD51L1, a member of the Rad51 family, knocked out. RAD51B(-/-) cells are viable, although spontaneous chromosomal aberrations kill about 20% of the cells in each cell cycle. Rad51B deficiency impairs homologous recombinational repair (HRR), as measured by targeted integration, sister chromatid exchange, and intragenic recombination at the immunoglobulin locus. RAD51B(-/-) cells are quite sensitive to the cross-linking agents cisplatin and mitomycin C and mildly sensitive to γ-rays. The formation of damage-induced Rad51 nuclear foci is much reduced in RAD51B(-/-) cells, suggesting that Rad51B promotes the assembly of Rad51 nucleoprotein filaments during HRR. These findings show that Rad51B is important for repairing various types of DNA lesions and maintaining chromosome integrity.

Original languageEnglish (US)
Pages (from-to)6476-6482
Number of pages7
JournalMolecular and Cellular Biology
Volume20
Issue number17
DOIs
StatePublished - 2000
Externally publishedYes

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Recombinational DNA Repair
Saccharomyces cerevisiae Proteins
Sister Chromatid Exchange
Nucleoproteins
Homologous Recombination
DNA
Mitomycin
Chromosome Aberrations
Cisplatin
Genetic Recombination
Vertebrates
Immunoglobulins
Chickens
Cell Cycle
B-Lymphocytes
Chromosomes
Proteins

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cell Biology

Cite this

Takata, M., Sasaki, M. S., Sonoda, E., Fukushima, T., Morrison, C., Albala, J. S., ... Takeda, S. (2000). The Rad51 paralog Rad51B promotes homologous recombinational repair. Molecular and Cellular Biology, 20(17), 6476-6482. https://doi.org/10.1128/MCB.20.17.6476-6482.2000

The Rad51 paralog Rad51B promotes homologous recombinational repair. / Takata, M.; Sasaki, M. S.; Sonoda, E.; Fukushima, T.; Morrison, C.; Albala, J. S.; Swagemakers, S. M A; Kanaar, R.; Thompson, L. H.; Takeda, S.

In: Molecular and Cellular Biology, Vol. 20, No. 17, 2000, p. 6476-6482.

Research output: Contribution to journalArticle

Takata, M, Sasaki, MS, Sonoda, E, Fukushima, T, Morrison, C, Albala, JS, Swagemakers, SMA, Kanaar, R, Thompson, LH & Takeda, S 2000, 'The Rad51 paralog Rad51B promotes homologous recombinational repair', Molecular and Cellular Biology, vol. 20, no. 17, pp. 6476-6482. https://doi.org/10.1128/MCB.20.17.6476-6482.2000
Takata M, Sasaki MS, Sonoda E, Fukushima T, Morrison C, Albala JS et al. The Rad51 paralog Rad51B promotes homologous recombinational repair. Molecular and Cellular Biology. 2000;20(17):6476-6482. https://doi.org/10.1128/MCB.20.17.6476-6482.2000
Takata, M. ; Sasaki, M. S. ; Sonoda, E. ; Fukushima, T. ; Morrison, C. ; Albala, J. S. ; Swagemakers, S. M A ; Kanaar, R. ; Thompson, L. H. ; Takeda, S. / The Rad51 paralog Rad51B promotes homologous recombinational repair. In: Molecular and Cellular Biology. 2000 ; Vol. 20, No. 17. pp. 6476-6482.
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