Deletion of the nucleotide excision repair gene Ercc1 reduces immunoglobulin class switching and alters mutations near switch recombination junctions

Carol E. Schrader, Joycelyn Vardo, Erin Linehan, Michael Z. Twarog, Laura J. Niedernhofer, Jan H.J. Hoeijmakers, Janet Stavnezer

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

The structure-specific endonuclease ERCC1-XPF is an essential component of the nucleotide excision DNA repair pathway. ERCC1-XPF nicks double-stranded DNA immediately adjacent to 3′ single-strand regions. Substrates include DNA bubbles and flaps. Furthermore, ERCC1 interacts with Msh2, a mismatch repair (MMR) protein involved in class switch recombination (CSR). Therefore, ERCC1-XPF has abilities that might be useful for antibody CSR. We tested whether ERCC1 is involved in CSR and found that Ercc1-/- splenic B cells show moderately reduced CSR in vitro, demonstrating that ERCC1-XPF participates in, but is not required for, CSR. To investigate the role of ERCC1 in CSR, the nucleotide sequences of switch (S) regions were determined. The mutation frequency in germline Sμ, segments and recombined Sμ-Sγ3 segments cloned from Ercc1-/- splenic B cells induced to switch in culture was identical to that of wild-type (WT) littermates. However, Ercc1-/- cells show increased targeting of the mutations to G:C bp in RGYW/WRCY hotspots and mutations occur at sites more distant from the S-S junctions compared with WT mice. The results indicate that ERCC1 is not epistatic with MMR and suggest that ERCC1 might be involved in processing or repair of DNA lesions in S regions during CSR.

Original languageEnglish (US)
Pages (from-to)321-330
Number of pages10
JournalJournal of Experimental Medicine
Volume200
Issue number3
DOIs
StatePublished - Aug 2 2004
Externally publishedYes

Keywords

  • Antibody
  • DNA repair
  • ERCC1-XPF
  • Heavy chain
  • Mouse B cells

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