The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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© The Rockefeller University Press, 0022-1007/1998/3/795/ $5.00
The Journal of Experimental Medicine, Volume 187, Number 5, March 2, 1998 795-799

Brief Definitive Reports

Rearrangement of {lambda} Light Chain Genes in Mature B Cells In Vitro and In Vivo. Function of Reexpressed Recombination-activating Gene (RAG) Products

Masaki Hikida and Hitoshi Ohmori

From the Department of Biotechnology, Faculty of Engineering, Okayama University, Tsushima-Naka, Okayama 700 Japan

V(D)J (V, variable; D, diversity; J, joining) combination of immunoglobulin (Ig) genes established in premature B cells has been thought to be conserved throughout differentiation at mature stages. However, germinal center (GC) B cells have been shown to reexpress recombination-activating gene (RAG)-1 and RAG-2 proteins in immunized mice. Here, we present several lines of evidence indicating that RAG proteins thus induced are functional as the V(D)J recombinase. DNA excision product reflecting V{lambda}1 to J{lambda}1 rearrangement was generated in parallel with the expression of RAG genes in mature mouse B cells that were activated in vitro with LPS and IL-4. Similar {lambda} chain gene rearrangement was observed in the draining lymph node of immunized mice. Further, B cells that underwent {lambda} gene rearrangement were shown by in situ PCR to be localized within GCs. Thus, secondary rearrangement of Ig genes (receptor editing) can occur in mature B cells.

This work was supported by a grant-in-aid from The Ministry of Education, Science and Culture of Japan and the grant from Nagase Science and Technology Foundation.

Address correspondence to Hitoshi Ohmori, Department of Biotechnology, Faculty of Engineering, Okayama University, Tsushima-Naka, Okayama 700, Japan. Phone: 81-86-251-8197; Fax: 81-86-251-8197; E-mail: hit2224{at}biotech.okayama-u.ac.jp


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