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Two copies of native trnK (UUU) gene are encoded on the sunflower mitochondrial DNA. They lie within two 12-kb direct repeats, presumably generated by a duplication event. During an investigation aimed at detecting DNA regions activating the trnK1 and trnK2 genes, three distinct promoters have been identified. Their locations were deduced using standard procedures (RT-PCR, RNA capping and 5′RACE)...
Promoter regions regulating the transcription of all cp-like tRNA genes encoded by the sunflower chondriome have been identified. Some of these genes are part of clusters where the first gene is a typical mitochondrial isoform.Promoters regulating the transcription of single cp-like tRNA genes have a variable structure whereas those regulating the transcription of native genes or clusters with typical...
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