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Alu's dimeric consensus sequence destabilizes its transcripts.

Tzu Huey Li1, Carl W Schmid

  • 1Departments of Surgery and Genetics, Stanford University, Stanford, CA 94305, USA.

Gene
|December 25, 2003
PubMed
Summary
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The left Alu monomer RNA transcript is more stable than the full-length sequence. Sequences beyond the left monomer destabilize Alu RNA, suggesting host selection for limited abundance.

Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Biology

Background:

  • Alu elements are repetitive sequences in the human genome.
  • Their transcripts are produced by RNA polymerase III (Pol III).
  • The stability and accumulation of these transcripts are not fully understood.

Purpose of the Study:

  • To investigate the impact of different Alu consensus sequence regions on transcript stability and accumulation.
  • To identify specific sequence elements responsible for regulating Alu RNA levels.

Main Methods:

  • Transient overexpression of Alu deletion and chimeric constructs in human 293 cells.
  • Analysis of RNA transcript stability and steady-state accumulation.

Main Results:

Related Experiment Videos

  • Transcripts of the left Alu monomer exhibit greater stability than full-length Alu consensus sequences.
  • Additional 3' sequences beyond the left monomer destabilize the transcripts.
  • The middle A-rich region and 3' A-rich tail do not significantly affect transcript stability.
  • The right Alu monomer is inherently less stable than the left monomer.
  • Both the dimeric structure and right monomer-specific sequences limit Alu transcript stability and accumulation.

Conclusions:

  • Alu's dimeric structure and right monomer sequences contribute to the limited stability and accumulation of its transcripts.
  • These features may have been selected by the host to control Alu RNA abundance or promote rapid metabolism.