Amino acid insertions and deletions contribute to diversify the human Ig repertoire. Review uri icon

Overview

abstract

  • The sequence analysis of Ig variable region genes transcribed within different B-cell subpopulations from human tonsil led us to identify a rare DNA sequence modification event consisting of bp insertions and/or deletions (I/D). Although these events were previously reported, they had never been formally associated with the somatic hypermutation process. I/D events share with more conventional somatic hypermutation events their localization within hypervariable regions and, most particularly, within DNA motifs known to be mutational hot spots. Repetitive DNA tracts or DNA elements capable of forming DNA loop intermediates seem to be the preferred substrate for I/D to occur. These characteristics suggest a model for somatic hypermutation reminiscent of the "polymerase slippage" model involved in replication and repair mutations in prokaryotes, yeast, and mammals.

publication date

  • April 1, 1998

Research

keywords

  • Antibody Diversity
  • Genes, Immunoglobulin
  • Mutation

Identity

Scopus Document Identifier

  • 0031916926

PubMed ID

  • 9602360

Additional Document Info

volume

  • 162