In D-loop: 40 years of mitochondrial 7S DNA.

TitleIn D-loop: 40 years of mitochondrial 7S DNA.
Publication TypeJournal Article
Year of Publication2014
AuthorsNicholls, TJ, Minczuk, M
JournalExp Gerontol
Date Published2014 Aug
KeywordsAge Factors, Aging, Animals, DNA Replication, DNA, Mitochondrial, Gene Expression Regulation, Humans, Mitochondria, Nucleic Acid Conformation, Structure-Activity Relationship

Given the tiny size of the mammalian mitochondrial genome, at only 16.5 kb, it is often surprising how little we know about some of its molecular features, and the molecular mechanisms governing its maintenance. One such conundrum is the biogenesis and function of the mitochondrial displacement loop (D-loop). The mitochondrial D-loop is a triple-stranded region found in the major non-coding region (NCR) of many mitochondrial genomes, and is formed by stable incorporation of a third, short DNA strand known as 7S DNA. In this article we review the current affairs regarding the main features of the D-loop structure, the diverse frequency of D-loops in the mtDNAs of various species and tissues, and also the mechanisms of its synthesis and turnover. This is followed by an account of the possible functions of the mitochondrial D-loop that have been proposed over the last four decades. In the last section, we discuss the potential links of the D-loop with mammalian ageing.

Alternate JournalExp. Gerontol.
Citation Key10.1016/j.exger.2014.03.027
PubMed ID24709344
Grant ListMC_U105697135 / / Medical Research Council / United Kingdom