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Title: Orthogonal control of expression mean and variance by epigenetic features at different genomic loci

Journal Article · · Molecular Systems Biology
 [1];  [1];  [1];  [2];  [2]
  1. University of California, Berkeley, CA (United States)
  2. University of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

While gene expression noise has been shown to drive dramatic phenotypic variations, the molecular basis for this variability in mammalian systems is not well understood. Gene expression has been shown to be regulated by promoter architecture and the associated chromatin environment. However, the exact contribution of these two factors in regulating expression noise has not been explored. Using a dual-reporter lentiviral model system, we deconvolved the influence of the promoter sequence to systematically study the contribution of the chromatin environment at different genomic locations in regulating expression noise. By integrating a large-scale analysis to quantify mRNA levels by smFISH and protein levels by flow cytometry in single cells, we found that mean expression and noise are uncorrelated across genomic locations. Furthermore, we showed that this independence could be explained by the orthogonal control of mean expression by the transcript burst size and noise by the burst frequency. Finally, we showed that genomic locations displaying higher expression noise are associated with more repressed chromatin, thereby indicating the contribution of the chromatin environment in regulating expression noise.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1213434
Journal Information:
Molecular Systems Biology, Vol. 11, Issue 5; ISSN 1744-4292
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 70 works
Citation information provided by
Web of Science

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Epistasis and destabilizing mutations shape gene expression variability in humans via distinct modes of action journal September 2016
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Mammalian gene expression variability is explained by underlying cell state journal February 2020
Synthetic STARR-seq reveals how DNA shape and sequence modulate transcriptional output and noise journal November 2018
Challenges in measuring and understanding biological noise journal May 2019
Transcriptome Analysis in Yeast Reveals the Externality of Position Effect posted_content April 2020
Exploiting aberrant mRNA expression in autism for gene discovery and diagnosis journal April 2016
Discontinuous transcription book December 2015
Tuning noise in gene expression journal May 2015
Noise propagation with interlinked feed-forward pathways journal March 2016
From Structural Variation of Gene Molecules to Chromatin Dynamics and Transcriptional Bursting journal June 2015
Discontinuous transcription journal January 2018
Relaxation oscillations and hierarchy of feedbacks in MAPK signaling journal January 2017
Differences in Transcriptional Dynamics Between T-cells and Macrophages as Determined by a Three-State Mathematical Model journal February 2020
What shapes eukaryotic transcriptional bursting? journal January 2017
Distinct promoter activation mechanisms modulate noise-driven HIV gene expression journal December 2015
Efficient and flexible implementation of Langevin simulation for gene burst production journal December 2017
Cell fate in antiviral response arises in the crosstalk of IRF, NF-κB and JAK/STAT pathways journal February 2018
Modulation of transcriptional burst frequency by histone acetylation journal June 2018
Variation is function: Are single cell differences functionally important?: Testing the hypothesis that single cell variation is required for aggregate function journal December 2015
Multiplexed imaging of high-density libraries of RNAs with MERFISH and expansion microscopy journal March 2018
Mitochondria and the non-genetic origins of cell-to-cell variability: More is different journal December 2015
Independent regulation of gene expression level and noise by histone modifications journal June 2017
The Pathway To Establishing HIV Latency Is Critical to How Latency Is Maintained and Reversed journal April 2018
Exploiting aberrant mRNA expression in autism for gene discovery and diagnosis posted_content April 2016