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p53 inhibits adeno-associated viral vector integration

Jeana Zacharias1, Liudmila G Romanova, Jeremiah Menk

  • 1Division of Rheumatic and Autoimmune Diseases, Department of Medicine, Institute of Human Genetics, University of Minnesota, Minneapolis, MN 55455, USA.

Human Gene Therapy
|April 22, 2011
PubMed

Insights

Functional p53 protein inhibits adeno-associated viral (AAV) vector integration into the genome. P53-deficient cells show higher AAV integration efficiency, suggesting p53

Area of Science:

  • Molecular Biology
  • Genetics
  • Virology

Background:

  • Adeno-associated viral (AAV) vectors are utilized in gene therapy, with integration efficiency influenced by cellular DNA repair pathways.
  • AAV vectors preferentially integrate into DNA repair-deficient cells, such as those with DNA-PKcs deficiency or reduced poly(ADP-ribose) polymerase-1.
  • The tumor suppressor protein p53 plays a critical role in regulating DNA repair gene transcription, and its mutation is common in cancers.

Purpose of the Study:

  • To investigate the effect of functional p53 on the efficiency of adeno-associated viral (AAV) vector integration.
  • To test the hypothesis that p53-negative cells are more permissive to AAV integration than p53-positive cells.

Main Methods:

  • Quantification of recombinant AAV vector integration (encoding rep and green fluorescent protein) in HCT116 colon cancer cells.
  • Comparison of AAV integration efficiency between p53-expressing (p53-positive) and p53-deficient (p53-negative) cell lines.

Main Results:

  • A significantly higher efficiency of AAV integration was observed in p53-negative cells compared to p53-positive cells.
  • These findings indicate that functional p53 actively inhibits AAV integration.
  • Further experiments suggest p53 binds to the AAV Rep protein, inhibiting its activity during integration.

Conclusions:

  • Functional p53 acts as a barrier to adeno-associated viral (AAV) vector genome integration.
  • The p53-mediated inhibition of AAV integration is likely due to direct interaction with the AAV Rep protein.
  • Understanding this interaction could inform strategies for enhancing AAV vector integration in gene therapy applications.

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