Quantifying <i>E. coli</i> Proteome and Transcriptome with Single-Molecule Sensitivity in Single Cells
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Abstract
Protein and messenger RNA (mRNA) copy numbers vary from cell to cell in isogenic bacterial populations. However, these molecules often exist in low copy numbers and are difficult to detect in single cells. We carried out quantitative system-wide analyses of protein and mRNA expression in individual cells with single-molecule sensitivity using a newly constructed yellow fluorescent protein fusion library for Escherichia coli. We found that almost all protein number distributions can be described by the gamma distribution with two fitting parameters which, at low expression levels, have clear physical interpretations as the transcription rate and protein burst size. At high expression levels, the distributions are dominated by extrinsic noise. We found that a single cell's protein and mRNA copy numbers for any given gene are uncorrelated.
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The record
- Venue
- Science
- Topic
- Gene Regulatory Network Analysis
- Field
- Biochemistry, Genetics and Molecular Biology
- Canadian institutions
- University of Toronto
- Funders
- Canadian Institutes of Health ResearchNational Institutes of Health
- Keywords
- Messenger RNABiologyEscherichia coliTranscriptomeProteomeSingle-cell analysisTranscription (linguistics)Fusion proteinGene expressionMolecular biologyRNACellGeneUncorrelatedCell biologyGenetics
- Has abstract in OpenAlex
- yes