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Related Experiment Videos

A comprehensive analysis of recently integrated human Ta L1 elements.

Jeremy S Myers1, Bethaney J Vincent, Hunt Udall

  • 1Department of Biological Sciences, Biological Computation and Visualization Center, Louisiana State University, 202 Life Sciences Building, Baton Rouge, LA 70803, USA.

American Journal of Human Genetics
|June 19, 2002
PubMed
Summary

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The L1 Ta subfamily of long interspersed elements (LINEs) expanded after human and ape divergence. Many elements are polymorphic, serving as markers for human evolution studies.

Area of Science:

  • Genomics
  • Molecular Evolution
  • Human Genetics

Background:

  • L1 LINEs are retrotransposons comprising a significant portion of the human genome.
  • The Ta (transcribed, subset a) subfamily is a distinct lineage within L1 elements.
  • Understanding L1 Ta subfamily dynamics is crucial for insights into genome evolution.

Purpose of the Study:

  • To analyze the phylogenetic origin and genomic diversity of L1 Ta elements in the human genome.
  • To determine the evolutionary age and expansion timing of the L1 Ta subfamily.
  • To identify L1 Ta elements as potential markers for studying human evolution.

Main Methods:

  • Extraction of 468 L1 Ta elements from the human genome.
  • Polymerase-chain-reaction (PCR) assays for phylogenetic screening.

Related Experiment Videos

  • Sequence analysis of full-length and truncated L1 Ta elements.

    • Main Results:

    • Identified 124 full-length L1 Ta elements, with 44 potentially capable of retrotransposition.
    • Estimated the L1 Ta subfamily age at 1.99 million years, post-human-ape divergence.
    • Found 45% of L1 Ta elements to be polymorphic, indicating recent insertions and variation.

    Conclusions:

    • The L1 Ta subfamily expansion occurred after the human-ape split.
    • Most L1 Ta elements are human-specific, with few exceptions found in chimpanzees.
    • Polymorphic L1 Ta elements are valuable for studying human genomic variation and evolution.