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Patterns of somatic mutations in immunoglobulin variable genes.

G B Golding, P J Gearhart, B W Glickman

    Genetics
    |January 1, 1987
    PubMed
    Summary

    Somatic mutations in antibody genes differ from meiotic mutations, with unique substitution patterns observed. Nearby DNA repeats may template these antibody gene mutations.

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    Area of Science:

    • Immunology
    • Molecular Biology
    • Genetics

    Background:

    • The mechanism driving somatic mutation in antibody variable genes remains unclear.
    • Existing DNA mutation mechanisms may not fully explain antibody gene alterations.

    Purpose of the Study:

    • To investigate if somatic mutations in mouse immunoglobulin variable genes exhibit distinct nucleotide substitution patterns compared to meiotic mutations.
    • To assess the role of nearby direct and inverted repeat sequences in templating somatic mutations within antibody genes.

    Main Methods:

    • Analysis of 421 somatic mutations from rearranged immunoglobulin variable genes in mice.
    • Comparison of substitution patterns between somatic and meiotic mutations.
    • Examination of local DNA sequences for direct and inverted repeats.

    Main Results:

    • A distinct difference in nucleotide substitution patterns was identified between somatic and meiotic mutations.
    • Somatic mutations showed an increased frequency of T:A to C:G transitions.
    • Somatic mutants exhibited a decreased frequency of mutations involving guanine (G) compared to meiotic mutants.
    • Direct and palindromic repeat sequences capable of templating mutations were frequently found near variable genes.

    Conclusions:

    • The mutational process for somatic mutations in antibody genes appears to differ from that of meiotic mutation.
    • Mistemplating by nearby DNA repeats may contribute to the enhancement of somatic mutation in antibody genes.
    • While other factors may target mutations, repeat sequences offer a potential templating mechanism.

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