Macromolecular Crowding Induces Spatial Correlations That Control Gene Expression Bursting Patterns
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Recent superresolution microscopy studies in E. coli demonstrate that the cytoplasm has highly variable local concentrations where macromolecular crowding plays a central role in establishing membrane-less compartmentalization. This spatial inhomogeneity significantly influences molecular transport and association processes central to gene expression. Yet, little is known about how macromolecular crowding influences gene expression bursting—the episodic process where mRNA and proteins are produced in bursts. Here, we simultaneously measured mRNA and protein reporters in cell-free systems, showing that macromolecular crowding decoupled the well-known relationship between fluctuations in the protein population (noise) and mRNA population statistics. Crowded environments led to a 10-fold increase in protein noise even though there were only modest changes in the mRNA population and fluctuations. Instead, cell-like macromolecular crowding created an inhomogeneous spatial distribution of mRNA (“spatial noise”) that led to large variability in the protein production burst size. As a result, the mRNA spatial noise created large temporal fluctuations in the protein population. Furthermore, these results highlight the interplay between macromolecular crowding, spatial inhomogeneities, and the resulting dynamics of gene expression, and provide insights into using these organizational principles in both cell-based and cell-free synthetic biology.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1439942
- Journal Information:
- ACS Synthetic Biology, Vol. 7, Issue 5; ISSN 2161-5063
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Transport of probe particles in a polymer network: effects of probe size, network rigidity and probe–polymer interaction
|
journal | January 2019 |
Quantitative imaging of gene-expressing liposomes reveals rare favorable phenotypes
|
journal | April 2019 |
Self-Organization Controls Expression More than Abundance of Molecular Components of Transcription and Translation in Confined Cell-Free Gene Expression
|
journal | January 2018 |
Cell-free microcompartmentalised transcription–translation for the prototyping of synthetic communication networks
|
journal | August 2019 |
Bottom-up construction of complex biomolecular systems with cell-free synthetic biology | text | January 2020 |
Similar Records
Crowding-Induced Spatial Organization of Gene Expression in Cell-Sized Vesicles
Macromolecular crowding can account for RNase-sensitive constraint of bacterial nucleoid structure