Document Detail

p53 inhibits adeno-associated viral vector integration.
MedLine Citation:
PMID:  21506732     Owner:  NLM     Status:  MEDLINE    
Adeno-associated viral (AAV) vectors preferentially integrate into the genome of cells that are defective in DNA repair, such as occurs with DNA-PKcs deficiency or poly(ADP-ribose) polymerase-1 down-regulation. As the tumor suppressor protein p53 regulates the transcription of many genes involved in DNA repair, we sought to determine whether functional p53 affects the efficiency of AAV integration. p53 is mutated in more than 50% of cancers, and site-specific integration of AAV into the AAVS1 site of human chromosome 19 has frequently been observed in transformed cancer cell lines, but rarely seen in primary cells or in vivo. We therefore hypothesized that p53-negative cells would be more permissive to AAV integration than p53-positive cells. The integration of a rep- and green fluorescent protein-encoding recombinant AAV vector was quantified in p53-expressing and p53-deficient HCT116 colon cancer cells. Our results show that there is a higher efficiency of AAV integration in p53-negative cells compared with p53-positive cells, indicating that p53 does indeed inhibit AAV integration. Further experiments suggest that this p53-mediated block to AAV integration is likely to be through binding of p53 to the AAV Rep protein and the consequent inhibition of Rep activity during AAV integration.
Jeana Zacharias; Liudmila G Romanova; Jeremiah Menk; Nicola J Philpott
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2011-06-08
Journal Detail:
Title:  Human gene therapy     Volume:  22     ISSN:  1557-7422     ISO Abbreviation:  Hum. Gene Ther.     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-23     Completed Date:  2012-11-13     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  9008950     Medline TA:  Hum Gene Ther     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1445-51     Citation Subset:  IM    
Division of Rheumatic and Autoimmune Diseases, Department of Medicine, Institute of Human Genetics, University of Minnesota, Minneapolis, MN 55455, USA.
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MeSH Terms
Dependovirus / genetics,  physiology*
Genetic Vectors
HCT116 Cells
HeLa Cells
Tumor Suppressor Protein p53 / genetics*,  metabolism
Virus Integration
Grant Support
Reg. No./Substance:
0/Tumor Suppressor Protein p53

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