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Proc Natl Acad Sci U S A. 2006 Jun 6;103(23):8780-5. Epub 2006 May 25.

Cellular inhibitors of long interspersed element 1 and Alu retrotransposition.

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1
Center for Virology and Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.

Abstract

Long interspersed element (LINE) 1 retrotransposons are major genomic parasites that represent approximately 17% of the human genome. The LINE-1 ORF2 protein is also responsible for the mobility of Alu elements, which constitute a further approximately 11% of genomic DNA. Representative members of each element class remain mobile, and deleterious retrotransposition events can induce spontaneous genetic diseases. Here, we demonstrate that APOBEC3A and APOBEC3B, two members of the APOBEC3 family of human innate antiretroviral resistance factors, can enter the nucleus, where LINE-1 and Alu reverse transcription occurs, and specifically inhibit both LINE-1 and Alu retrotransposition. These data suggest that the APOBEC3 protein family may have evolved, at least in part, to defend the integrity of the human genome against endogenous retrotransposons.

PMID:
16728505
PMCID:
PMC1482655
DOI:
10.1073/pnas.0603313103
[Indexed for MEDLINE]
Free PMC Article
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