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Results). 4. The genes for the 9S and 12S RNAs cover less than 1900 bp on the maxi-circle (Borst and Hoeijmakers 1979b; Hoeijmakers and Borst 1978). 5. Size and sequence of 9S and 12S RNAs are conserved in evolution (Borst and Hoeijmakers 1979b; Simpson and Simpson 1978). 6. , unpubl. results) . These examples should suffice to show that the world of mitochondrial biogenesis does not end with HeLa cells, yeast and a little Neurospora. Although mitochondrial biogenesis is probably similar in outline throughout nature, the details of the process are rather different in trypanosomes, plants, and man.

Adapted from Van Ommen et al. 1980) insert VI. Synthesis of mature rRNA may therefore involve more processing steps than the splicing required to remove insert VI. Insertions I, II and IV, oxi-3 and the Discovery of Circular RNAs in Mitochondria If insert VI is an intervening sequence in the rRNA gene, the obvious possibility is that the other inserts are intervening sequences in other genes. The first evidence for this came from a detailed analysis of mitochondrial transcripts by Van Ommen, Groot and Grivell (Van Ommen and Groot 1977, 1979) in our lab.

How this tRNA folds up into a stable tertiary structure is at present a mystery. Summary The unusual features discussed above present a picture of a genetic system which has been isolated for a considerable time from the mainstream of prokaryotic and eukaryotic evolution. whether these features represent a more primitive system or a very highly evolved specialist system is difficult to tell. An attractive theory of mitochondrial evolution is that they evolved from primitive bacteria that entered into a symbiotic relationship with the cell at an early stage in the evolution of eukaryotes.

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A textbook of inorganic chemistry vol.X The metal-amines

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