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Related Experiment Videos

Evolution of the cryptic FMR1 CGG repeat

E E Eichler1, C B Kunst, K A Lugenbeel

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA.

Nature Genetics
|November 1, 1995
PubMed
Summary
This summary is machine-generated.

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The FMR1 gene

Area of Science:

  • Evolutionary genetics
  • Mammalian genomics

Background:

  • The Fragile X mental retardation 1 (FMR1) gene's 5' untranslated region contains a CGG repeat.
  • The FMR1 CGG repeat's evolutionary history across mammals is not well understood.

Purpose of the Study:

  • To investigate the evolutionary conservation and variation of the FMR1 gene's CGG repeat across 44 mammalian species.
  • To understand the mechanisms driving the expansion and interruption of the FMR1 CGG repeat.

Main Methods:

  • Sequencing of the FMR1 5' untranslated region in 44 mammalian species.
  • Comparative sequence analysis and parsimony analysis to infer evolutionary events.

Main Results:

  • The FMR1 CGG repeat is conserved across all 44 sequenced mammalian species, indicating ancient origins.

Related Experiment Videos

  • Primates exhibit significantly larger and more interrupted CGG repeats compared to non-primate mammals.
  • Parsimony analysis suggests repeat enlargement occurred independently in at least three primate lineages.

    • Conclusions:

    • The FMR1 CGG repeat has undergone significant evolutionary changes, particularly in primates.
    • Replication slippage and unequal crossing over are likely mechanisms involved in the repeat's expansion and interruption.
    • The findings provide insights into the evolutionary dynamics of repetitive elements in mammalian genomes.