Abstract:
:In nature, microbes often need to "decide" which of several available nutrients to utilize, a choice that depends on a cell's inherent preference and external nutrient levels. While natural environments can have mixtures of different nutrients, phenotypic variation in microbes' decisions of which nutrient to utilize is poorly studied. Here, we quantified differences in the concentration of glucose and galactose required to induce galactose-responsive (GAL) genes across 36 wild S. cerevisiae strains. Using bulk segregant analysis, we found that a locus containing the galactose sensor GAL3 was associated with differences in GAL signaling in eight different crosses. Using allele replacements, we confirmed that GAL3 is the major driver of GAL induction variation, and that GAL3 allelic variation alone can explain as much as 90% of the variation in GAL induction in a cross. The GAL3 variants we found modulate the diauxic lag, a selectable trait. These results suggest that ecological constraints on the galactose pathway may have led to variation in a single protein, allowing cells to quantitatively tune their response to nutrient changes in the environment.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Lee KB,Wang J,Palme J,Escalante-Chong R,Hua B,Springer Mdoi
10.1371/journal.pgen.1006766subject
Has Abstractpub_date
2017-05-24 00:00:00pages
e1006766issue
5eissn
1553-7390issn
1553-7404pii
PGENETICS-D-16-02584journal_volume
13pub_type
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