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Applied and Environmental Microbiology, May 1999, p. 2267-2268, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Elevated Growth of Saccharomyces cerevisiae ATH1 Null Mutants on Glucose Is an Artifact of Nonmatching Auxotrophies of Mutant and Reference Strainsdagger

Rohini Chopra, Vishva Mitra Sharma, and K. Ganesan*

Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India

Received 26 May 1998/Accepted 21 January 1999

Yeast strains disrupted for ATH1, which encodes vacuolar acid trehalase, have been reported to grow to higher cell densities than reference strains. We showed that the increase in cell density is due to the URA3 gene introduced as a part of the disruption and concluded that the misinterpretation is a result of not using a control strain with matching auxotrophic markers.


* Corresponding author. Mailing address: Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India. Phone: 0091-172-695215, -695216, or -695219, ext. 442. Fax: 0091-172-690585 or -690632. E-mail: ganesank{at}usa.net.

dagger Communication no. 007/98 of the Institute of Microbial Technology, Chandigarh, India.


Applied and Environmental Microbiology, May 1999, p. 2267-2268, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.



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