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Related Experiment Videos

Activation-induced changes in alternate splice acceptor site usage.

T Prescott Atkinson1, Yuling Dai

  • 1Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35233, USA. patkinso@uab.edu

Biochemical and Biophysical Research Communications
|May 15, 2007
PubMed
Summary
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A specific DNA sequence (AGCAG motif) creates alternative protein versions by altering gene splicing. This process, observed in immune genes during cell activation, suggests a new way proteins are functionally modulated.

Area of Science:

  • Molecular Biology
  • Genetics
  • Immunology

Background:

  • Alternative splicing generates protein diversity.
  • The AGCAG motif at 3' splice acceptor sites can create alternate splice sites.
  • This can lead to protein isoforms differing by a single amino acid.

Purpose of the Study:

  • To identify genes containing the AGCAG motif.
  • To investigate the functional implications of AGCAG-mediated splicing.
  • To determine if splice variant ratios change during immune cell activation.

Main Methods:

  • Bioinformatic analysis of EST-verified splice acceptor sites.
  • cDNA analysis of five human immune genes (CD3zeta, CD79B, PLCgamma1, CD19, CD32B).
  • Quantification of splice variant ratios during T and B cell activation.

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Main Results:

  • The AGCAG motif was found in 74 out of 12,000+ splice sites (approx. 0.7%).
  • The single amino acid insertion can occur in functionally important protein regions.
  • All five tested immune genes produced two splice variants, with ratios varying during T and B cell activation.

Conclusions:

  • Activation-induced changes in mRNA splicing are a potential mechanism for protein functional modulation.
  • The AGCAG motif contributes to generating functionally distinct protein isoforms.
  • Splicing regulation during immune cell activation impacts protein function.