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Related Experiment Videos

Active Alu element "A-tails": size does matter.

Astrid M Roy-Engel1, Abdel-Halim Salem, Oluwatosin O Oyeniran

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

Genome Research
|September 6, 2002
PubMed
Summary
This summary is machine-generated.

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The length of Alu element poly-A tails significantly influences their ability to retrotranspose. Longer A-tails, particularly those over 40 bp, are associated with active Alu elements and disease-causing insertions.

Area of Science:

  • Genomics
  • Molecular Biology
  • Human Genetics

Background:

  • Long and short interspersed elements (LINEs and SINEs) constitute a significant portion of the human genome.
  • Alu elements are the most abundant SINEs, but factors governing their retroposition are not well understood.

Purpose of the Study:

  • To investigate the role of Alu element poly-A tail length in determining retropositional capacity.
  • To identify specific features of active Alu elements.

Main Methods:

  • Analysis of Alu and L1 element A-tail lengths across different subfamilies and disease-associated insertions.
  • Bioinformatic analysis of the human genome draft sequence to identify Alu elements with long A-tails.
  • Sequence analysis of specific Alu elements in patient and population samples.

Related Experiment Videos

Main Results:

  • Alu A-tail length is a key factor in retropositional capability, with longer tails (≥40 bp) correlating with active and disease-causing elements.
  • Actively amplifying Alu subfamilies and disease-associated elements exhibit significantly longer A-tails compared to older or young subfamilies.
  • A small subset of human Alu elements possess A-tails long enough to be considered active sources.

Conclusions:

  • Poly-A tail length is a critical determinant of Alu retroelement activity.
  • The findings provide a model for understanding Alu element amplification and their role in genomic variation and disease.
  • Variability in Alu A-tail length and sequence exists across human populations.