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. 1989 Apr 11;17(7):2613–2621. doi: 10.1093/nar/17.7.2613

Three mitochondrial tRNA genes from Arabidopsis thaliana: evidence for the conversion of a tRNAPhe gene into a tRNATyr gene.

H C Chen 1, H Wintz 1, J H Weil 1, D T Pillay 1
PMCID: PMC317646  PMID: 2717403

Abstract

Three tRNA genes have been isolated from a genomic library of Arabidopsis thaliana: a tRNASer (GCU), a tRNATyr (GUA) and a tRNAGlu (UUC) genes. These genes are located closely on the same DNA fragment. The tRNASer and the tRNAGlu genes have both 99% sequence similarity with their mitochondrial counterparts from higher plants indicating that these three tRNA genes are mitochondrial. The tRNATyr gene shows a particular high sequence similarity with the mitochondrial tRNAPhe pseudogene from maize, and both genes are flanked by a tRNASer gene in the upstream region. Extensive sequence comparisons of the Arabidopsis thaliana mitochondrial sequence containing the three tRNA genes and the corresponding region from maize and soybean mitochondria have shown evidence that the tRNA Tyr gene has been generated from a mitochondrial tRNAPhe gene. The conversion was accomplished by three genetic events: a 4 base-pair deletion, a mutation and a recombination, which led to the transformation of the acceptor stem and the anticodon.

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Selected References

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