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HIV Promoter Integration Site Primarily Modulates Transcriptional Burst Size Rather Than Frequency

Journal Article · · PLoS Computational Biology (Online)
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of California, Berkeley, CA (United States). California Inst. for Quantitative Biosciences; DOE/OSTI
  2. Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering; Univ. of California, Berkeley, CA (United States). Helen Wills Neuroscience Inst.
  3. Univ. of California, Berkeley, CA (United States). USB/UCSF. Joint Graduate Group in Bioengineering
  4. Univ. of California, Berkeley, CA (United States). California Inst. for Quantitative Biosciences; Univ. of California, Berkeley, CA (United States). Dept. of Chemical Engineering; Univ. of California, Berkeley, CA (United States). Helen Wills Neuroscience Inst.; Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering
  5. Univ. of California, Berkeley, CA (United States). California Inst. for Quantitative Biosciences; Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Physical Biosciences Division
Mammalian gene expression patterns, and their variability across populations of cells, are regulated by factors specific to each gene in concert with its surrounding cellular and genomic environment. Lentiviruses such as HIV integrate their genomes into semi-random genomic locations in the cells they infect, and the resulting viral gene expression provides a natural system to dissect the contributions of genomic environment to transcriptional regulation. Previously, we showed that expression heterogeneity and its modulation by specific host factors at HIV integration sites are key determinants of infected-cell fate and a possible source of latent infections. Here, we assess the integration context dependence of expression heterogeneity from diverse single integrations of a HIV-promoter/GFP-reporter cassette in Jurkat T-cells. Systematically fitting a stochastic model of gene expression to our data reveals an underlying transcriptional dynamic, by which multiple transcripts are produced during short, infrequent bursts, that quantitatively accounts for the wide, highly skewed protein expression distributions observed in each of our clonal cell populations. Interestingly, we find that the size of transcriptional bursts is the primary systematic covariate over integration sites, varying from a few to tens of transcripts across integration sites, and correlating well with mean expression. In contrast, burst frequencies are scattered about a typical value of several per cell-division time and demonstrate little correlation with the clonal means. This pattern of modulation generates consistently noisy distributions over the sampled integration positions, with large expression variability relative to the mean maintained even for the most productive integrations, and could contribute to specifying heterogeneous, integration-site-dependent viral production patterns in HIV-infected cells. Genomic environment thus emerges as a significant control parameter for gene expression variation that may contribute to structuring mammalian genomes, as well as be exploited for survival by integrating viruses.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627205
Journal Information:
PLoS Computational Biology (Online), Journal Name: PLoS Computational Biology (Online) Journal Issue: 9 Vol. 6; ISSN 1553-7358
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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  • S., Perelson, Alan; Christina, Ochsenbauer-Jambor,; C., Kappas, John
  • The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/1n1a-3d64
text January 2009
Genetic identity, biological phenotype, and evolutionary pathways of transmitted/founder viruses in acute and early HIV-1 infection text January 2009
c-Myc and Sp1 Contribute to Proviral Latency by Recruiting Histone Deacetylase 1 to the Human Immunodeficiency Virus Type 1 Promoter text January 2007
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HIV rebounds from latently infected cells, rather than from continuing low-level replication text January 2008

Cited By (42)

Transcription Stochasticity of Complex Gene Regulation Models journal September 2012
Flipping between Polycomb repressed and active transcriptional states introduces noise in gene expression journal June 2017
Multiplex single-cell visualization of nucleic acids and protein during HIV infection journal December 2017
Multiplexed imaging of high-density libraries of RNAs with MERFISH and expansion microscopy journal March 2018
Distinct promoter activation mechanisms modulate noise-driven HIV gene expression journal December 2015
Regulatory consequences of gene translocation in bacteria journal July 2012
HIV Provirus Stably Reproduces Parental Latent and Induced Transcription Phenotypes Regardless of the Chromosomal Integration Site journal June 2016
Fluctuations in Tat copy number when it counts the most: a possible mechanism to battle the HIV latency journal March 2013
Latency profiles of full length HIV-1 molecular clone variants with a subtype specific promoter journal September 2011
Inferring the kinetics of stochastic gene expression from single-cell RNA-sequencing data journal January 2013
Nonlatching positive feedback enables robust bimodality by decoupling expression noise from the mean journal October 2017
Genetic Selection for Context-Dependent Stochastic Phenotypes: Sp1 and TATA Mutations Increase Phenotypic Noise in HIV-1 Gene Expression journal July 2013
Multiplex Eukaryotic Transcription (In)activation: Timing, Bursting and Cycling of a Ratchet Clock Mechanism journal April 2015
Rapid Transcriptional Pulsing Dynamics of High Expressing Retroviral Transgenes in Embryonic Stem Cells journal May 2012
Cellular Superspreaders: An Epidemiological Perspective on HIV Infection inside the Body journal May 2014
Orthogonal control of expression mean and variance by epigenetic features at different genomic loci journal May 2015
Buffering and Amplifying Transcriptional Noise During Cell Fate Specification journal November 2018
Proviruses with Long-Term Stable Expression Accumulate in Transcriptionally Active Chromatin Close to the Gene Regulatory Elements: Comparison of ASLV-, HIV- and MLV-Derived Vectors journal March 2018
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Flipping between Polycomb repressed and active transcriptional states introduces noise in gene expression text January 2021
Short Residence Times of DNA-Bound Transcription Factors Can Reduce Gene Expression Noise and Increase the Transmission of Information in a Gene Regulation System journal April 2020
Short Residence Times of DNA-Bound Transcription Factors Can Reduce Gene Expression Noise and Increase the Transmission of Information in a Gene Regulation System text January 2020
Direct observation of frequency modulated transcription in single cells using light activation journal September 2013

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