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Related Experiment Videos

Two locus models for gluten sensitive enteropathy: population genetic considerations

D A Greenberg, J I Rotter

    American Journal of Medical Genetics
    |January 1, 1981
    PubMed
    Summary

    The genetic basis of coeliac disease (CD) involves two loci. This study suggests both loci exhibit recessive inheritance, aligning with observed disease prevalence and family segregation ratios.

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    Area of Science:

    • Genetics
    • Immunology
    • Gastroenterology

    Background:

    • Familial occurrence of coeliac disease (CD), also known as gluten-sensitive enteropathy (GSE), is established, but its inheritance pattern is not fully understood.
    • Previous models, such as Pena et al.'s two-locus hypothesis involving HLA-D (DRw3) and a B-cell alloantigen, faced inconsistencies between predicted gene frequencies and observed disease prevalence.
    • The proposed model by Pena et al. suggested dominant inheritance for DRw3 and recessive for the B-cell alloantigen locus.

    Purpose of the Study:

    • To re-examine the genetic basis of coeliac disease by evaluating gene frequencies within a two-locus model.
    • To reconcile the observed disease prevalence and segregation ratios in published family studies with genetic inheritance models.
    • To determine the inheritance pattern (dominant or recessive) at the two proposed genetic loci for coeliac disease.

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    Main Methods:

    • Analysis of gene frequencies under a two-locus inheritance model.
    • Incorporation of known disease prevalence limits for coeliac disease.
    • Utilizing segregation ratios derived from 42 published family pedigrees of coeliac disease patients.

    Main Results:

    • The gene frequencies proposed by Pena et al. accurately predict the observed segregation ratio in published pedigrees.
    • These gene frequencies also align with current estimates of coeliac disease prevalence.
    • The observed segregation ratio is consistent with a two-locus model where both loci exhibit recessive inheritance.

    Conclusions:

    • A two-locus model for coeliac disease is supported by the data.
    • Recessive inheritance at both the HLA-D locus (DRw3) and the unlinked GSE-associated B-cell alloantigen locus best explains the observed familial occurrence and prevalence of coeliac disease.
    • A dominant-recessive model for the two loci is unlikely without assuming reduced penetrance, which complicates the inheritance pattern.