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Transposable element number in mixed mating populations.

M T Morgan1

  • 1School of Biological Sciences, Washington State University, Pullman, WA 99164-4236, USA. mmorgan@wsu.edu

Genetical Research
|August 7, 2001
PubMed
Summary
This summary is machine-generated.

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Self-fertilization in plants can decrease transposable element numbers when insertions are harmful, but may increase them if ectopic exchange regulates element count. Deleterious insertion appears more likely to regulate element numbers in plants.

Area of Science:

  • Population genetics
  • Molecular evolution
  • Plant biology

Background:

  • Theoretical studies on transposable elements (TEs) predominantly examine random mating systems.
  • Many plant species exhibit partial or substantial self-fertilization, a factor often overlooked in TE dynamics.
  • Ty1-copia elements in plants serve as a model for understanding TE behavior.

Purpose of the Study:

  • To investigate the impact of self-fertilization on transposable element dynamics in plant populations.
  • To compare the regulatory roles of deleterious insertions versus ectopic exchange in controlling TE numbers.
  • To model TE behavior in partially self-fertilizing populations using computer simulations and analytic approximations.

Main Methods:

  • Development of computer simulations and analytic approximations for simplified TE dynamics.

Related Experiment Videos

  • Modeling transposition balanced by selective elimination of TEs.
  • Utilizing Ty1-copia elements as a biological reference.

    • Main Results:

    • Self-fertilization generally decreases TE numbers when insertions are deleterious.
    • TE numbers may increase with self-fertilization if ectopic exchange is the primary regulatory mechanism.
    • Abrupt changes in TE numbers can occur with minor shifts in selfing rates, particularly when fitness effects differ between homozygous and heterozygous elements.
    • Population size significantly influences equilibrium TE numbers, especially at high selfing rates.
    • Small, highly selfing populations tend to lose TEs under the deleterious insertion model but can accumulate large numbers under ectopic exchange.

    Conclusions:

    • Deleterious insertion is a more probable mechanism for regulating TE numbers in plants compared to ectopic exchange, based on current empirical data.
    • The regulatory role of ectopic exchange is sensitive to parameter values with limited empirical support.
    • Tentative conclusions are drawn due to limitations in available empirical data, especially comparative studies across species with differing mating systems.