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Sequence heterogeneity in Ig kappa transcripts from single B lymphocytes.

P K Jena1, A H Liu, D S Smith

  • 1Department of Immunology, National Jewish Medical and Research Center, 1400 Jackson St., Denver, CO 80206, USA.

Molecular Immunology
|September 23, 2000
PubMed
Summary
This summary is machine-generated.

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Somatic hypermutation in kappa genes leads to sequence changes, suggesting rapid repair mechanisms. These findings offer insights into antibody gene diversification and mutation biases.

Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Antibody variable (V) region genes undergo somatic hypermutation to generate diverse antibody responses.
  • The mechanisms and sequence specificities of somatic hypermutation and subsequent repair are not fully understood.

Purpose of the Study:

  • To investigate sequence heterogeneity and aberrant splicing in kappa cDNA from single B lymphocytes.
  • To determine the origin of base changes and their relationship to somatic hypermutation and repair mechanisms.

Main Methods:

  • Individual amplification of kappa cDNA from single B lymphocytes.
  • Analysis of sequence heterogeneity, base changes, and splicing patterns.
  • Comparison with beta2 microglobulin transcripts to rule out polymerase infidelity.

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Main Results:

  • Kappa cDNA revealed sequence heterogeneity and aberrantly spliced products, not attributable to polymerase errors.
  • Base changes occurred in trinucleotide sequences disfavored by somatic hypermutation.
  • Transcript alterations were absent from the kappa immunoglobulin (Ig) gene, suggesting rapid repair after limited transcription.

Conclusions:

  • Somatic mutations may be acquired by the kappa gene and rapidly repaired, influencing observed mutation frequencies.
  • Preferential repair of mutations in specific trinucleotide contexts could explain microsequence-specific biases in antibody V gene mutation rates.