The Journal of Experimental Medicine
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Published 19 February 2002. doi:10.1084/jem.20012144
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© Rockefeller University Press, 0022-1007/2002/2/529/ $5.00
The Journal of Experimental Medicine, Volume 195, Number 4, February 18, 2002 529-534


Brief Definitive Report

Activation-induced Deaminase (AID)-directed Hypermutation in the Immunoglobulin Sµ Region : Implication of AID Involvement in a Common Step of Class Switch Recombination and Somatic Hypermutation



Hitoshi Nagaoka, Masamichi Muramatsu, Namiko Yamamura, Kazuo Kinoshita and Tasuku Honjo

Department of Medical Chemistry Graduate School of Medicine, Kyoto University, Kyoto 606-8501, Japan

Address correspondence to T. Honjo, Department of Medical Chemistry, Graduate School of Medicine, Kyoto University, Yoshida Konoe-cho, Sakyo-Ku, Kyoto 606-8501, Japan. Phone: 81-75-753-4371; Fax: 81-75-753-4388; E-mail: honjo{at}mfour.med.kyoto-u.ac.jp

Somatic hypermutation (SHM) and class switch recombination (CSR) cause distinct genetic alterations at different regions of immunoglobulin genes in B lymphocytes: point mutations in variable regions and large deletions in S regions, respectively. Yet both depend on activation-induced deaminase (AID), the function of which in the two reactions has been an enigma. Here we report that B cell stimulation which induces CSR but not SHM, leads to AID-dependent accumulation of SHM-like point mutations in the switch µ region, uncoupled with CSR. These findings strongly suggest that AID itself or a single molecule generated by RNA editing function of AID may mediate a common step of SHM and CSR, which is likely to be involved in DNA cleavage.

Key Words: B lymphocyte • immunoglobulin gene • heavy chain • DNA cleavage • error-prone repair


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