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Related Experiment Videos

Monophyletic origin of Alu elements in primates

E Zietkiewicz1, C Richer, D Sinnett

  • 1Centre de Recherche de l'Hôpital Sainte-Justine, Centre de Cancérologie Charles Bruneau, Département de Pédiatrie de l'Université de Montréal, Montréal, Québec, H3T-1C5 Canada.

Journal of Molecular Evolution
|August 7, 1998
PubMed
Summary
This summary is machine-generated.

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Primate Alu elements evolved from monomers forming heterodimers around 60 million years ago. These elements propagated across primate lineages for 40 million years, with subsequent lineage-specific adaptations.

Area of Science:

  • Genomics
  • Molecular Evolution
  • Primate Genetics

Background:

  • Alu elements are repetitive sequences in primate genomes.
  • Understanding Alu element evolution provides insight into primate genome dynamics.

Purpose of the Study:

  • To investigate the early evolution of primate Alu elements.
  • To characterize Alu sequences in Malagasy prosimians and galagos.
  • To compare these sequences with ancient human Alu elements.

Main Methods:

  • Sequence characterization of Alu repeats from lemurs, sifakas, and galagos.
  • Comparative analysis with known human Alu elements (Alu J, S monomers).

Main Results:

  • Formation of an Alu heterodimer from free monomers approximately 60 million years ago, prior to prosimian divergence.

Related Experiment Videos

  • Propagation of these dimeric Alu elements across primate lineages for approximately 40 million years (until ~20 Myr ago) with conserved features.
  • Post-20 Myr ago divergence: Malagasy prosimians show linker extension in dimeric Alu, while galagos show amplification of novel short elements.

    • Conclusions:

    • A conserved 'retropositional niche' likely constrained Alu evolution until approximately 20 million years ago.
    • Subsequent relaxation of these constraints led to lineage-specific Alu amplification strategies.
    • This study illuminates the evolutionary history and diversification of primate-specific repetitive elements.