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Related Experiment Videos

Eo: a history of a mutation.

Z Dembić, P A Singer, J Klein

    The EMBO Journal
    |July 1, 1984
    PubMed
    Summary

    Mice with t haplotypes often lack E molecules due to defects in the H-2 complex. These defects include issues with E alpha gene transcription or protein conversion, with deletions being a common cause.

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    Area of Science:

    • Immunogenetics
    • Molecular Biology
    • Mouse Genetics

    Background:

    • Cell-surface E molecules, controlled by H-2 complex class II genes, are crucial in immune responses.
    • Eighteen mouse strains carrying t haplotypes were identified as E molecule-negative (Eo strains).
    • Understanding defects in E molecule expression is key to deciphering immune system regulation.

    Purpose of the Study:

    • To investigate the molecular basis for the lack of E molecule expression in Eo mouse strains.
    • To characterize the genetic defects responsible for E molecule deficiency in t haplotype-carrying mice.
    • To compare these defects with known mutations in other H-2 haplotypes.

    Main Methods:

    • Northern and Southern blot analyses were performed on Eo and non-t strains.
    • Gene transcription and protein conversion efficiency were assessed.
    • Deletion mapping was used to identify the extent of genetic alterations.

    Main Results:

    • Two primary defects were identified: failure to convert E alpha mRNA into functional protein (3 strains) and failure to transcribe the E alpha gene due to a ~650 bp deletion (other Eo strains).
    • The deletion encompasses the promoter region, RNA initiation site, and first exon of the E alpha gene.
    • These defects mirror those found in H-2f, H-2q, H-2b, and H-2s haplotypes, with identical E alpha deletion characteristics.

    Conclusions:

    • The E alpha deletion is an ancient mutation likely disseminated by t chromosomes in mouse populations.
    • The observed defects in E molecule expression are linked to specific H-2 loci.
    • These findings provide insights into the evolution of H-2 haplotypes and their impact on immune function.

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