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Science 2 May 1986:
Vol. 232. no. 4750, pp. 641 - 643
DOI: 10.1126/science.3008334
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Articles

Science, Vol 232, Issue 4750, 641-643
Copyright © 1986 by American Association for the Advancement of Science

articles

A mutation in the R body-coding sequence destroys expression of the killer trait in P. tetraurelia

JA Dilts and RL Quackenbush

This report describes a mutant strain of Caedibacter taeniospiralis 169 that does not produce refractile (R) bodies or kill sensitive paramecia, but still renders its host resistant to killing by wild-type strains of Caedibacter taeniospiralis. The mutation is due to insertion of a 7.5-kilobase, transposon-like element into the R body-coding region of the plasmid pKAP169. The results provide strong evidence that R body synthesis is required for expression of the killer trait.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)