Dual feedback loops in the GAL regulon suppress cellular heterogeneity in yeast.
Transcriptional noise is known to be an important cause of cellular heterogeneity and phenotypic variation. The extent to which molecular interaction networks may have evolved to either filter or exploit transcriptional noise is a much debated question. The yeast genetic network regulating galactose metabolism involves two proteins, Gal3p and Gal80p, that feed back positively and negatively, respectively, on GAL gene expression. Using kinetic modeling and experimental validation, we demonstrate that these feedback interactions together are important for (i) controlling the cell-to-cell variability of GAL gene expression and (ii) ensuring that cells rapidly switch to an induced state for galactose uptake.
Ramsey
Stephen A
SA
Institute for Systems Biology, 1441 N 34th Street, Seattle, Washington 98103, USA.
Smith
Jennifer J
JJ
Orrell
David
D
Marelli
Marcello
M
Petersen
Timothy W
TW
de Atauri
Pedro
P
Bolouri
Hamid
H
Aitchison
John D
JD
D003198:Computer Simulation; D025461:Feedback, Physiological; D005690:Galactose / Q000235:genetics* / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D008957:Models, Genetic; D018085:Regulon; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism
D005690:Galactose