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JOURNAL ARTICLE

The complete mitochondrial genome of the dusky shark Carcharhinus obscurus

Dean C Blower, James P Hereward, Jennifer R Ovenden
Mitochondrial DNA 2013, 24 (6): 619-21
23551174
The dusky shark Carcharhinus obscurus is economically important but vulnerable to overharvesting. The complete C. obscurus mitogenome was assembled from approximately 1 million whole genome shotgun sequences using a combination of reference mapping and de novo assembly (mean coverage 59x). This resulted in a 16,706 bp double-stranded circular mitochondrial sequence. Following the consensus vertebrate mtDNA genome, it comprises 13 protein-coding genes, 22 transfer RNAs, two ribosomal RNAs and has 2 non-coding areas. The A + T (56.9%) versus G + C (43.1%) composition confirmed an A + T bias previously noted for sharks. This genome is the first for the speciose Carcharhinus genus and provides a valuable resource for studies of shark molecular systematics, phylogeography, conservation genetics, and stock structure.

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