Replication of mitochondrial DNA occurs by strand displacement with alternative light-strand origins, not via a strand-coupled mechanism.

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Genes & Development. 2005 Oct 15;19(20):2466-76. doi: 10.1101/gad.1352105

Brown TA, Cecconi C, Tkachuk AN, Bustamante C, Clayton DA

Note: Research in this publication was not performed at Janelia.

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Abstract

The established strand-displacement model for mammalian mitochondrial DNA (mtDNA) replication has recently been questioned in light of new data using two-dimensional (2D) agarose gel electrophoresis. It has been proposed that a synchronous, strand-coupled mode of replication occurs in tissues, thereby casting doubt on the general validity of the "orthodox," or strand-displacement model. We have examined mtDNA replicative intermediates from mouse liver using atomic force microscopy and 2D agarose gel electrophoresis in order to resolve this issue. The data provide evidence for only the orthodox, strand-displacement mode of replication and reveal the presence of additional, alternative origins of lagging light-strand mtDNA synthesis. The conditions used for 2D agarose gel analysis are favorable for branch migration of asymmetrically replicating nascent strands. These data reconcile the original displacement mode of replication with the data obtained from 2D gel analyses.

PMID: 16230534 [PubMed - indexed for MEDLINE]

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Replication of mitochondrial DNA occurs by strand displacement with alternative light-strand origins, not via a strand-coupled mechanism.

Note: Research in this publication was not performed at Janelia.

Abstract

PMID: 16230534 [PubMed - indexed for MEDLINE]

Janelia Authors