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. 1992 Apr;11(4):1291–1296. doi: 10.1002/j.1460-2075.1992.tb05172.x

In vivo import of a normal or mutagenized heterologous transfer RNA into the mitochondria of transgenic plants: towards novel ways of influencing mitochondrial gene expression?

I Small 1, L Maréchal-Drouard 1, J Masson 1, G Pelletier 1, A Cosset 1, J H Weil 1, A Dietrich 1
PMCID: PMC556576  PMID: 1563345

Abstract

Evidence that nuclear-encoded RNAs are present inside mitochondria has been reported from a wide variety of organisms, and is presumed to be due to import of specific cytosolic RNAs. In plants, the first examples were the mitochondrial leucine transfer RNAs of bean. In all cases, the evidence is circumstantial, based on hybridization of the mitochondrial RNAs to nuclear and not mitochondrial DNA. Here we show that transgenic potato plants carrying a leucine tRNA gene from bean nuclear DNA contain RNA transcribed from the introduced gene both in the cytosol and inside mitochondria, providing proof that the mitochondrial leucine tRNA is derived from a nuclear gene and imported into the mitochondria. The same bean gene carrying a 4 bp insertion in the anticodon loop was also expressed in transgenic potato plants and the transcript found to be present inside mitochondria, suggesting that this natural RNA import system could eventually be used to introduce foreign RNA sequences into mitochondria.

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