Abstract
DNA combing technology is a powerful methodology for the study of DNA replication in vivo. This tool can be used to identify origins of replication, assess of directionality of forks, and measure fork speed. Over the years, the method has been used extensively to study nuclear DNA replication. The first step involves the incorporation of thymidine analogs (CldU and IdU) into nascent DNA chains and followed by their visualization with immunofluorescence using antibodies that can distinguish the two analogs. Recently, we adapted and fine-tuned DNA combing technology to the specifics of mitochondrial DNA (Phillips et al., 2017, p. 155). The protocol, which we termed mito-SMARD (mitochondrial single molecule analysis of replication DNA), provides in vivo insight into mitochondrial DNA (mtDNA) replication with high resolution.
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