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Related Experiment Videos

Recently integrated human Alu repeats: finding needles in the haystack.

A M Roy1, M L Carroll, D H Kass

  • 1Tulane Cancer Center SL-66, Department of Environmental Health Sciences, Tulane University--Medical Center, New Orleans, LA 70112, USA.

Genetica
|August 22, 2000
PubMed
Summary

Scientists developed two new methods to quickly find recently inserted Alu elements in the human genome. These new Alu insertion markers are valuable for studying human evolution.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Alu elements are mobile genetic sequences that amplify via retroposition and integrate throughout primate genomes.
  • The human genome contains over 500,000 Alu elements, making the identification of new insertions challenging.
  • Recently inserted Alu elements can serve as polymorphic markers for evolutionary studies.

Purpose of the Study:

  • To present two complementary methods for the rapid detection of newly integrated Alu elements.
  • To explore the utility of these methods by applying them to the Ya8 Alu subfamily.
  • To identify polymorphic Alu insertion markers for human evolution research.

Main Methods:

  • Computational analysis of human genomic DNA sequence databases to identify recent Alu insertions.

Related Experiment Videos

  • Development of Allele-Specific Alu PCR (ASAP), an anchor-PCR technique for selective amplification of Alu elements.
  • Detection of Alu insertion polymorphisms by comparing DNA 'fingerprints' from different samples.

    • Main Results:

    • Successful identification of recently integrated Alu elements using both computational and ASAP methods.
    • Application of the methods to the Ya8 Alu subfamily, identifying approximately 50 elements.
    • Demonstration that about 50% of Ya8 Alu family members are polymorphic, indicating recent insertion.

    Conclusions:

    • The developed computational and ASAP methods enable rapid detection of newly integrated Alu elements.
    • The Ya8 Alu subfamily contains a significant proportion of polymorphic insertions useful for evolutionary studies.
    • These methods provide valuable tools for identifying and analyzing Alu insertion polymorphisms in the human genome.