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(q-bio conference)
UIUC - Urbana-Champaign IL – USA
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Schedule
Wednesday, July 29, 2020
2:00 AM America/New_York
Domain
Physics of LifeHost
The 2020 virtual q-bio Conference
Duration
70 minutes
Single-cell measurements of mRNA copy numbers inform our understanding of stochastic gene expression, but these measurements coarse-grain over the individual copies of the gene, where transcription and its regulation take place stochastically. We recently combined single-molecule quantification of mRNA and gene loci to measure the transcriptional activity of an endogenous gene in individual Escherichia coli bacteria. When interpreted using a theoretical model for mRNA dynamics, the single-cell data allowed us to obtain the probabilistic rates of promoter switching, transcription initiation and elongation, mRNA release and degradation. Unexpectedly, we found that gene activity can be strongly coupled to the transcriptional state of another copy of the same gene present in the cell, and to the event of gene replication during the bacterial cell cycle. These gene-copy and cell-cycle correlations demonstrate the limits of mapping whole-cell mRNA numbers to the underlying stochastic gene activity and highlight the contribution of previously hidden variables to the observed population heterogeneity.
Ido Golding
(q-bio conference)
UIUC - Urbana-Champaign IL – USA
Contact & Resources
open source
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