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Curr Genet
1988 Jan 01;131:91-6. doi: 10.1007/bf00365762.
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Clustering of tRNA genes in Paracentrotus lividus mitochondrial DNA.
Cantatore P, Roberti M, Rainaldi G, Saccone C, Gadaleta MN.
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We have determined the base sequence of the restriction fragment Bam1-2 (3,593) of Paracentrotus lividus (sea urchin) mtDNA. This fragment contains, in addition to genes previously identified (part of the 12S rRNA, ND1 and part of the ND2 mRNA), a cluster of 15 tRNA genes located between the 12S and ND1 genes. Also to be found in the tRNA gene cluster, between the tRNA(Thr) and tRNA(Pro) genes, is a sequence of 134 bp which constitutes the only non-coding region of this DNA so far identified. The distinctive organization of the tRNA genes and the extreme size reduction of the non-coding region suggest the existence of unique mechanisms for the regulation of gene expression in this organism.
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