Transcription-dependent gene looping of the HIV-1 provirus is dictated by recognition of pre-mRNA processing signals.

Molecular Cell
Kelly J PerkinsNick J Proudfoot

Abstract

HIV-1 provirus, either as a chromosomal integrant or as an episomal plasmid in HeLa cells, forms a transcription-dependent gene loop structure between the 5'LTR promoter and 3'LTR poly(A) signal. Flavopiridol-mediated inhibition of RNA polymerase II elongation blocks 5' to 3'LTR juxtaposition, indicating that this structure is maintained during transcription. Analysis of mutant or hybrid HIV-1 plasmids demonstrates that replacement of the 5'LTR promoter with CMV or the 3'LTR poly(A) signal with a synthetic element (SPA) permits gene loop formation, suggesting that these interactions are not retroviral specific. In addition, activation of the 5'LTR poly(A) signal or inactivation of the 3'LTR poly(A) signal abolishes gene loop formation. Overall, we demonstrate that both ongoing transcription and pre-mRNA processing are essential for gene loop formation, and predict that these structures represent a defining feature of active gene transcription.

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Methods Mentioned

BETA
immunoprecipitation
PCR
ChIP
FCS
transfection

Software Mentioned

Rotor
ImageQuant IQ Tools
p3C
Gene6

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