Structure of nonhairpin coding-end DNA breaks in cells undergoing V(D)J recombination

被引:65
作者
Schlissel, MS
机构
[1] Johns Hopkins Univ, Sch Med, Dept Med, Baltimore, MD 21205 USA
[2] Johns Hopkins Univ, Sch Med, Dept Genet & Mol Biol, Baltimore, MD 21205 USA
[3] Johns Hopkins Univ, Sch Med, Dept Oncol, Baltimore, MD 21205 USA
关键词
D O I
10.1128/MCB.18.4.2029
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The V(D)J recombinase recognizes a pair of immunoglobulin or T-cell receptor gene segments flanked by recombination signal sequences and introduces double-strand breaks, generating two signal ends and two coding ends, Broken coding ends were initially identified as covalently closed hairpin DNA molecules. Before recombination, however, the hairpins must be opened and the ends must be modified by nuclease digestion and N-region addition. We have now analyzed nonhairpin coding ends associated with various immunoglobulin gene segments in cells undergoing V(D)J recombination. We found that these broken DNA ends have different nonrandom 5'-strand deletions which were characteristic for each! locus examined, These deletions correlate well with the sequence characteristics of coding joints involving these gene segments, In addition, unlike broken signal ends, these nonhairpin coding-end V(D)J recombination reaction intermediates have 3' overhanging ends, We discuss the implications of these results for models of how sequence modifications occur during coding-joint formation.
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页码:2029 / 2037
页数:9
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