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J. Biol. Chem., Vol. 266, Issue 17, 10844-10850, Jun, 1991
D L'Abbe, JF Duhaime, BF Lang and R Morais
Transcription start sites of chicken mitochondrial DNA have been mapped in
the control region by direct sequencing of in vitro capped mitochondrial
RNA species, by primer extension and by S1 nuclease protection analysis.
Transcription of the heavy strand initiates predominantly at a site 156
nucleotides upstream of the tRNA(Phe) gene, i.e. about 135 nucleotides
further upstream than the corresponding sites in amphibia and mammals. On
the opposite strand, transcription starts predominantly one nucleotide
removed from the site in the heavy strand. The L-strand position start site
is similar to that found in other vertebrates. The chicken mitochondrial
DNA control region thus contains one major transcriptional promoter, whose
bidirectional capacity is similar to the situation in amphibia but which
contrasts to the mainly unidirectional capacity of mammalian promoters. In
chicken mitochondria, the sequence comprising the start sites is A + T rich
and contains an almost perfect inverted repeat which can be folded into a
cruciform structure. The heavy and light strand initiation sites are
flanked on their respective 3' ends by an octanucleotide sequence matching
those surrounding the start sites in Xenopus laevis (5'- ACPuTTATA-3').
This motif is found associated with the H-strand start sites in mouse but
is not present in human nor bovine mitochondrial DNA promoters.
The transcription of DNA in chicken mitochondria initiates from one major bidirectional promoter
Departement de Biochimie, Faculte de Medecine, Universite de Montreal, Quebec, Canada.
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