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Molecular and Cellular Biology, November 1998, p. 6430-6435, Vol. 18, No. 11
Bayer-chair Department of Molecular
Immunology and Allergology,
Received 30 April 1998/Returned for modification 1 June
1998/Accepted 27 July 1998
Rad52 plays a pivotal role in double-strand break (DSB) repair and
genetic recombination in Saccharomyces cerevisiae, where mutation of this gene leads to extreme X-ray sensitivity and defective recombination. Yeast Rad51 and Rad52 interact, as do their human homologues, which stimulates Rad51-mediated DNA strand exchange in
vitro, suggesting that Rad51 and Rad52 act cooperatively. To define the
role of Rad52 in vertebrates, we generated
RAD52
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Homologous Recombination, but Not DNA Repair, Is
Reduced in Vertebrate Cells Deficient in RAD52


and
/
mutants of the chicken B-cell line
DT40. Surprisingly, RAD52
/
cells were not
hypersensitive to DNA damages induced by
-irradiation, methyl
methanesulfonate, or cis-platinum(II)diammine
dichloride (cisplatin). Intrachromosomal recombination, measured by
immunoglobulin gene conversion, and radiation-induced Rad51 nuclear
focus formation, which is a putative intermediate step during
recombinational repair, occurred as frequently in
RAD52
/
cells as in wild-type cells.
Targeted integration frequencies, however, were consistently reduced in
RAD52
/
cells, showing a clear role for
Rad52 in genetic recombination. These findings reveal
striking differences between S. cerevisiae and vertebrates
in the functions of RAD51 and RAD52.
*
Corresponding author. Mailing address: Bayer-chair
Department of Molecular Immunology and Allergology, Faculty of
Medicine, Kyoto University, Konoe Yoshida, Sakyo-ku, Kyoto 606-8501, Japan. Phone: 81-75-771-8159. Fax: 81-75-771-8184. E-mail:
stakeda{at}mfour.med.kyoto-u.ac.jp.
Present address: Department of Cellular Immunology,
Heinrich-Pette-Institute, 20251 Hamburg, Germany.
Present address: Department of Radiation and Cellular Oncology,
University of Chicago, Chicago, IL 60637.
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