Mitochondrial genome variation of Atlantic cod

Abstract Objective The objective of this study was to analyse intraspecific sequence variation of Atlantic cod mitochondrial DNA, based on a comprehensive collection of completely sequenced mitochondrial genomes. Results We determined the complete mitochondrial DNA sequence of 124 cod specimens from...

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Bibliographic Details
Main Authors: JøRgensen, Tor, Bürd Karlsen, à Se Emblem, Breines, Ragna, Andreassen, Morten, Rounge, Trine, Nederbragt, Alexander, Kjetill Jakobsen, Nymark, Marianne, Ursvik, Anita, Coucheron, Dag, Jakt, Lars, Nordeide, Jarle, Moum, Truls, Johansen, Steinar
Format: Article in Journal/Newspaper
Language:unknown
Published: Figshare 2018
Subjects:
Genetics
FOS Biological sciences
Evolutionary Biology
59999 Environmental Sciences not elsewhere classified
FOS Earth and related environmental sciences
Ecology
69999 Biological Sciences not elsewhere classified
Inorganic Chemistry
FOS Chemical sciences
60506 Virology
Computational Biology
atlantic cod
North Atlantic
Online Access:https://dx.doi.org/10.6084/m9.figshare.c.4138877
https://figshare.com/collections/Mitochondrial_genome_variation_of_Atlantic_cod/4138877
Description
Summary:Abstract Objective The objective of this study was to analyse intraspecific sequence variation of Atlantic cod mitochondrial DNA, based on a comprehensive collection of completely sequenced mitochondrial genomes. Results We determined the complete mitochondrial DNA sequence of 124 cod specimens from the eastern and western part of the speciesâ distribution range in the North Atlantic Ocean. All specimens harboured a unique mitochondrial DNA haplotype. Nine hundred and fifty-two polymorphic sites were identified, including 109 non-synonymous sites within protein coding regions. Eighteen variable sites were identified as indels, exclusively distributed in structural RNA genes and non-coding regions. Phylogeographic analyses based on 156 available cod mitochondrial genomes did not reveal a clear structure. There was a lack of mitochondrial genetic differentiation between two ecotypes of cod in the eastern North Atlantic, but eastern and western cod were differentiated and mitochondrial genome diversity was higher in the eastern than the western Atlantic, suggesting deviating population histories. The geographic distribution of mitochondrial genome variation seems to be governed by demographic processes and gene flow among ecotypes that are otherwise characterized by localized genomic divergence associated with chromosomal inversions.

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