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Related Experiment Videos

AID mediates hypermutation by deaminating single stranded DNA.

Sarah K Dickerson1, Eleonora Market, Eva Besmer

  • 1Laboratory of Lymphocyte Biology, 1230 York Ave., New York, NY 10021, USA.

The Journal of Experimental Medicine
|May 21, 2003
PubMed
Summary

Activation-induced deaminase (AID) deaminates DNA, not RNA, and targets single-stranded DNA. This protein does not target mutational hotspots, suggesting other factors influence mutation targeting in immunoglobulin gene diversification.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Activation-induced deaminase (AID) is crucial for immunoglobulin gene diversification.
  • The exact function of AID in somatic hypermutation (SHM), class switch recombination (CSR), and gene conversion remains unclear.

Purpose of the Study:

  • To elucidate the precise role and molecular mechanisms of AID in immunoglobulin gene diversification.
  • To determine AID's substrate specificity (DNA vs. RNA) and binding preferences (single-stranded vs. double-stranded DNA).

Main Methods:

  • Purification of tetrameric AID protein.
  • In vitro assays to assess deamination activity on DNA and RNA substrates.
  • DNA binding assays to determine substrate preference.

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Main Results:

  • Purified AID exhibits cytidine deaminase activity on DNA, but not RNA.
  • AID preferentially binds and deaminates single-stranded DNA, suggesting a link to transcription.
  • AID does not inherently target known mutational hotspots.

Conclusions:

  • AID's activity is specific to single-stranded DNA, supporting a direct role in transcription-coupled processes.
  • The lack of hotspot targeting by AID indicates that other mechanisms regulate mutational site selection.
  • These findings clarify AID's enzymatic function and its implications for immunoglobulin gene diversification.