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Related Experiment Videos

HL-A, fertility and natural selection.

D B Amos

    Acta Endocrinologica. Supplementum
    |January 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Maternal antibodies typically do not harm pregnancies, but high antibody levels can be linked to abortion. Immune interactions between mother, sperm, and fetus may influence reproduction and natural selection.

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    Area of Science:

    • Reproductive immunology
    • Developmental biology
    • Immunogenetics

    Background:

    • Gravid females can produce antibodies, usually without adverse effects, leading to maternal hyporesponsiveness.
    • Exceptions exist, particularly in cases of abortion, where antibody frequency may be elevated.
    • Sperm antigens in mice include T locus alleles, H-2, and H-Y, with T locus involvement in differentiation and early embryonic expression.

    Purpose of the Study:

    • To investigate the role of immune interactions between sperm, ovum, and mother during reproduction.
    • To explore the potential significance of antigenic differences in natural selection.
    • To examine maternal-fetal immunological differences and their impact on placental development and hybrid vigor.

    Main Methods:

    • Analysis of antibody production in gravid females.

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  • Identification and characterization of sperm antigens (T locus, H-2, H-Y) in mice.
  • Investigation of potential sperm selection mechanisms by ova.
  • Examination of maternal-fetal graft-versus-host reactions in the placenta.

    • Main Results:

    • Maternal antibodies are generally well-tolerated, but high levels may correlate with abortion.
    • T locus alleles are expressed on early but not late mouse embryos.
    • Research is ongoing to identify similar factors in humans.
    • Maternal-fetal immune differences can induce placental changes, potentially influencing hybrid vigor.

    Conclusions:

    • Immune interactions between mother, sperm, and fetus play a significant role in reproductive success and natural selection.
    • The ovum may possess mechanisms to select compatible sperm based on cell surface markers.
    • Placental enlargement due to maternal-fetal immune reactions may contribute to hybrid vigor and act as a protective mechanism.