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Signals of selection in the mitogenome provide insights into adaptation mechanisms in heterogeneous habitats in a widely distributed pelagic fish

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Relation http://eprints.cmfri.org.in/14286/
https://www.nature.com/articles/s41598-020-65905-1
https://doi.org/10.1038/s41598-020-65905-1
 
Title Signals of selection in the
mitogenome provide insights
into adaptation mechanisms in
heterogeneous habitats in a widely
distributed pelagic fish
 
Creator Sebastian, Wilson
Sukumaran, Sandhya
Zacharia, P U
Muraleedharan, K R
Dinesh Kumar, P K
Gopalakrishnan, A
 
Subject Fish Genetics
Pelagic Fishes
 
Description Oceans are vast, dynamic, and complex ecosystems characterized by fluctuations in environmental
parameters like sea surface temperature (SST), salinity, oxygen availability, and productivity.
Environmental variability acts as the driver of organismal evolution and speciation as organisms
strive to cope with the challenges. We investigated the evolutionary consequences of heterogeneous
environmental conditions on the mitogenome of a widely distributed small pelagic fish of Indian
ocean, Indian oil sardine, Sardinella longiceps. Sardines were collected from different eco-regions
of the Indian Ocean and selection patterns analyzed in coding and non-coding regions. Signals of
diversifying selection were observed in key functional regions involved in OXPHOS indicating OXPHOS
gene regulation as the critical factor to meet enhanced energetic demands. A characteristic control
region with 38–40 bp tandem repeat units under strong selective pressure as evidenced by sequence
conservation and low free energy values was also observed. These changes were prevalent in fishes from
the South Eastern Arabian Sea (SEAS) followed by the Northern Arabian Sea (NAS) and rare in Bay of
Bengal (BoB) populations. Fishes belonging to SEAS exhibited accelerated substitution rate mainly due
to the selective pressures to survive in a highly variable oceanic environment characterized by seasonal
hypoxia, variable SST, and food availability.
 
Date 2020
 
Type Article
PeerReviewed
 
Format text
 
Language en
 
Identifier http://eprints.cmfri.org.in/14286/1/Nature%20Scientific%20Reports_2020_Sandhya%20Sukumaran_Signals%20of%20selection%20in%20the%20mitogenome%20provide%20insights%20into%20adaptation%20mechanisms.pdf
Sebastian, Wilson and Sukumaran, Sandhya and Zacharia, P U and Muraleedharan, K R and Dinesh Kumar, P K and Gopalakrishnan, A (2020) Signals of selection in the mitogenome provide insights into adaptation mechanisms in heterogeneous habitats in a widely distributed pelagic fish. Nature Scientific Reports, 10 (9081). pp. 1-14.