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Genetics, Vol 127, 327-334, Copyright © 1991
INVESTIGATIONS |
A Mutation in the Large Subunit Ribosomal RNA Gene of Tetrahymena Confers Anisomycin Resistance and Cold Sensitivity
R. Sweeney, C. H. Yao and M. C. Yao
Fred Hutchinson Cancer Research Center, Seattle, Washington 98104
Anisomycin, an antibiotic that specifically inhibits the peptidyl transfer function of eukaryotic ribosomes, has been used to select resistant mutants in Tetrahymena thermophila. A mutation conferring anisomycin resistance (an-r) has been localized to a 1.2-kb fragment of the large subunit ribosomal RNA (rRNA) gene by transformation via microinjection. A single base pair change was detected within this region. Nine independently isolated an-r mutants had the same base pair change. T. thermophila strains that are homozygous for this mutation are cold sensitive, unable to mate and grossly abnormal in cell morphology.
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