Abstract
The impact of somatic hypermutation on the lambda light chain repertoire of individual IgM+ peripheral B cells in the absence (nonproductive rearrangements) and presence (productive rearrangements) of selective influences was analyzed. In the 27 mutated nonproductive VλJλ rearrangements obtained from individual peripheral B cells, a significantly greater mutational frequency was observed in the complementarity-determining region (CDR) in comparison to the framework region (FR), whereas the mutational frequencies in both the CDR and FR of the 100 mutated productive VλJλ rearrangements were significantly greater. R mutations were introduced comparably in CDR and FR of nonproductive VλJλ rearrangements, but were significantly decreased in FR of productive VλJλ rearrangements. The majority of codons defined as hot spots for R mutations were within CDR in both the nonproductive and productive VλJλ rearrangements. Targeting of mutations to RGYW/WRCY motifs was observed such that 38% of all mutations in the nonproductive VλJλ rearrangements were within RGYW/WRCY motifs. Mutations in RGYW/WRCY motifs were positively selected and accounted for > 50% of all mutations in the mutated productive VλJλ rearrangements. These data indicate that targeting of the mutational machinery and selection of mutations in these targeted motifs play major roles in influencing nucleotide changes in VλJλ rearrangements.
Original language | English (US) |
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Pages (from-to) | 1597-1605 |
Number of pages | 9 |
Journal | European Journal of Immunology |
Volume | 30 |
Issue number | 6 |
DOIs | |
State | Published - 2000 |
Keywords
- Antibody
- B lymphocyte
- Generation of diversity, and evolution
- Human
ASJC Scopus subject areas
- Immunology and Allergy
- Immunology