Summary
We have isolated cold-resistant revertants from a mitochondrial cold-sensitive mutation, cs909, localized in the 21S ribosomal RNA gene.
Two types of revertants have been isolated: (1) strong revertants which were shown to be due to a single, nuclear, dominant suppressor; (2) weak revertants which are all due to the presence of a single, nuclear, recessive suppressor.
The recessive suppressor, when separated from the mitochondrial mutation, itself confers a cold-sensitive phenotype, that is, there is a mutual suppression between the mitochondrial cold-sensitive mutation and the nuclear cold-sensitive mutation. The suppressor by itself produces modified ribosomes and therefore probably codes for an element of the mitochondrial ribosome such as a ribosomal protein.
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Communicated by F. Kaudewitz
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Contamine, V., Bolotin-Fukuhara, M. A mitochondrial ribosomal RNA mutation and its nuclear suppressors. Molec Gen Genet 193, 280–287 (1984). https://doi.org/10.1007/BF00330681
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DOI: https://doi.org/10.1007/BF00330681