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That which does not kill yeast makes it stronger
Date:1/29/2012

ng fluconazole, tunicamycin, or benomyl, when compared to euploid cells.

Interestingly, certain chromosome combinations dominated in colonies that were resistant to a specific drug. Fluconazole-resistant colonies typically gained an extra copy of chromosome VIII, tunicamycin-resistant colonies tended to lose chromosome XVI, while a majority of benomyl-resistant colonies got rid of chromosome XII. "This suggested to us that specific karyotypes are associated with resistance to certain drugs," says Chen.

Digging deeper, Chen grew tunicamycin-resistant yeast cells, which had adapted to the presence of the antibiotic by losing one copy of chromosome XVI, under drug-free conditions. Before long, colonies of two distinct sizes emerged. He quickly discovered that the faster growing colonies had regained the missing chromosome. By returning to a normal chromosome XVI number, these newly arisen euploid cells had acquired a distinctive growth advantage over their aneuploid neighbors. But most importantly, the fast growing yeast cells were no longer resistant to tunicamycin and thus clearly linking tunicamycin resistance to the loss of chromosome XVI.


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Contact: Gina Kirchweger
gxk@stowers.org
816-806-1036
Stowers Institute for Medical Research
Source:Eurekalert

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