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Alu-containing exons are alternatively spliced.

Rotem Sorek1, Gil Ast, Dan Graur

  • 1Department of Zoology, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv 69978, Israel. rotem@compugen.co.il

Genome Research
|July 5, 2002
PubMed
Summary
This summary is machine-generated.

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Alu elements, repetitive sequences in the human genome, are predominantly alternatively spliced into messenger RNAs (mRNAs). Their insertion into constitutive exons is likely selected against due to detrimental effects.

Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Alu elements constitute over 10% of the human genome, with numerous documented instances of exonization into mature mRNAs.
  • Exonization involves the splicing of Alu sequences into mRNA, a process studied here in relation to alternative splicing.

Discussion:

  • Analysis of expressed sequence tags (ESTs) and complementary DNAs (cDNAs) revealed Alu sequences in 5.2% of alternatively spliced internal exons but none in constitutively spliced exons.
  • The majority of Alu-containing exons within coding regions induce frameshifts or premature termination codons, suggesting a negative impact on protein function.

Key Insights:

  • Internal exons containing Alu sequences are overwhelmingly, if not exclusively, alternatively spliced.
  • Constitutive insertion of Alu sequences into mRNA appears to be evolutionarily disadvantageous and thus selected against.

Related Experiment Videos

Outlook:

  • Further investigation into the regulatory mechanisms governing Alu element splicing can elucidate their role in transcriptome diversity.
  • Understanding the evolutionary pressures on Alu exonization may provide insights into genome evolution and disease.