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. 1986 Oct 24;14(20):8111–8119. doi: 10.1093/nar/14.20.8111

Small tandemly repeated DNA sequences of higher plants likely originate from a tRNA gene ancestor.

A A Benslimane, M Dron, C Hartmann, A Rode
PMCID: PMC311838  PMID: 3774553

Abstract

Several monomers (177 bp) of a tandemly arranged repetitive nuclear DNA sequence of Brassica oleracea have been cloned and sequenced. They share up to 95% homology between one another and up to 80% with other satellite DNA sequences of Cruciferae, suggesting a common ancestor. Both strands of these monomers show more than 50% homology with many tRNA genes; the best homologies have been obtained with Lys and His yeast mitochondrial tRNA genes (respectively 64% and 60%). These results suggest that small tandemly repeated DNA sequences of plants may have evolved from a tRNA gene ancestor. These tandem repeats have probably arisen via a process involving reverse transcription of polymerase III RNA intermediates, as is the case for interspersed DNA sequences of mammalians. A model is proposed to explain the formation of such small tandemly repeated DNA sequences.

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Selected References

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