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Mapping of nascent light and heavy strand transcripts on the physical map of HeLa cell mitochondrial DNA

Cantatore, Palmiro and Attardi, Giuseppe (1980) Mapping of nascent light and heavy strand transcripts on the physical map of HeLa cell mitochondrial DNA. Nucleic Acids Research, 8 (12). pp. 2605-2625. ISSN 0305-1048. doi:10.1093/nar/8.12.2605.

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The sequences complementary to the nascent RNA molecules isolated from transcription complexes of HeLa cell mtDNA have been mapped on the H and L strands of mtDNA by the S1 protection technique. The distribution of these sequences among different Hpa II restriction fragments was found to reflect the position of these fragments in the Hpa II map of mtDNA. Thus, the S1-resistant hybrids formed with the L strand corresponded almost exclusively to the right half of the genome past the origin of replication in the direction of L strand transcription, and were especially concentrated in the region immediately adjacent to the origin. By contrast, the hybrid duplexes involving the H strand appeared to be localized in the left half of the genome, and in particular in the quadrant of the map adjacent to the origin in the direction of H strand transcription. These results strongly suggest that the region of mtDNA around the origin of replication contains an initiation site for L strand transcription and an initiation site for H strand transcription.

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Additional Information:Copyright © 1980 Oxford University Press. Received May 12, 1980. These investigations were supported by a research grant from the USPHS (GM-11726) and by a Fellowship of the Italian National Research Council (C. N. R.) to P. C. Some of the results presented here have been communicated in a different form in the ICN-UCLA Symposium on "Extrachromosomal DNA", held in Keystone, Colorado, March 11-16, 1979(18). The valuable technical assistance of Ms. A. Drew is gratefully acknowledged.
Issue or Number:12
Record Number:CaltechAUTHORS:CANnar80
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2023
Deposited By: Tony Diaz
Deposited On:02 Mar 2006
Last Modified:08 Nov 2021 19:44

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