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Average inbreeding or equilibrium inbreeding?

P W Hedrick

    American Journal of Human Genetics
    |June 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Equilibrium inbreeding in human populations consistently exceeds average inbreeding, reaching over 25% higher in highly inbred groups. This elevated inbreeding level also reduces the equilibrium frequency of detrimental alleles.

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    Area of Science:

    • Population Genetics
    • Human Genetics
    • Quantitative Genetics

    Background:

    • Inbreeding, the mating of related individuals, significantly impacts population genetic structure.
    • Understanding inbreeding dynamics is crucial for predicting allele frequencies and genetic health.
    • Previous models often used average inbreeding, potentially underestimating its true equilibrium level.

    Purpose of the Study:

    • To determine the equilibrium level of inbreeding in human populations.
    • To compare equilibrium inbreeding with average inbreeding.
    • To assess the effect of elevated inbreeding on the frequency of recessive detrimental alleles.

    Main Methods:

    • Theoretical population genetics modeling.
    • Analysis of inbreeding coefficients over generations.

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  • Simulation of allele frequency changes under different inbreeding scenarios.

    • Main Results:

    • Equilibrium inbreeding is consistently higher than average inbreeding across populations.
    • For highly inbred human populations, equilibrium inbreeding is >25% greater than average.
    • Equilibrium is approached within 10 generations, even with no initial inbreeding.
    • The equilibrium frequency of recessive detrimental alleles is lower than predicted using average inbreeding.

    Conclusions:

    • Inbreeding equilibrium in human populations is higher than commonly assumed.
    • This elevated inbreeding has implications for the load of recessive genetic disorders.
    • Standard calculations using average inbreeding may underestimate the genetic consequences of inbreeding.