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G-quadruplex formation in nascent RNA, but not in template DNA, causes premature termination of transcription. In vitro transcription with the mitochondrial transcription apparatus was carried out in the presence or absence of 7-deaza-GTP to monitor effects of G-quadruplex formation in RNA. To address the effects of G-quadruplex formation in DNA, the DNA templates used were produced by PCR amplification of positions 1–512 of human mtDNA in the presence or absence of 7-deaza-dGTP.
