Evolutionary changes of multiple visual pigment genes in the complete genome of Pacific bluefin tuna.

Abstract:

:Tunas are migratory fishes in offshore habitats and top predators with unique features. Despite their ecological importance and high market values, the open-ocean lifestyle of tuna, in which effective sensing systems such as color vision are required for capture of prey, has been poorly understood. To elucidate the genetic and evolutionary basis of optic adaptation of tuna, we determined the genome sequence of the Pacific bluefin tuna (Thunnus orientalis), using next-generation sequencing technology. A total of 26,433 protein-coding genes were predicted from 16,802 assembled scaffolds. From these, we identified five common fish visual pigment genes: red-sensitive (middle/long-wavelength sensitive; M/LWS), UV-sensitive (short-wavelength sensitive 1; SWS1), blue-sensitive (SWS2), rhodopsin (RH1), and green-sensitive (RH2) opsin genes. Sequence comparison revealed that tuna's RH1 gene has an amino acid substitution that causes a short-wave shift in the absorption spectrum (i.e., blue shift). Pacific bluefin tuna has at least five RH2 paralogs, the most among studied fishes; four of the proteins encoded may be tuned to blue light at the amino acid level. Moreover, phylogenetic analysis suggested that gene conversions have occurred in each of the SWS2 and RH2 loci in a short period. Thus, Pacific bluefin tuna has undergone evolutionary changes in three genes (RH1, RH2, and SWS2), which may have contributed to detecting blue-green contrast and measuring the distance to prey in the blue-pelagic ocean. These findings provide basic information on behavioral traits of predatory fish and, thereby, could help to improve the technology to culture such fish in captivity for resource management.

authors

Nakamura Y,Mori K,Saitoh K,Oshima K,Mekuchi M,Sugaya T,Shigenobu Y,Ojima N,Muta S,Fujiwara A,Yasuike M,Oohara I,Hirakawa H,Chowdhury VS,Kobayashi T,Nakajima K,Sano M,Wada T,Tashiro K,Ikeo K,Hattori M,Kuhara S,

doi

10.1073/pnas.1302051110

subject

Has Abstract

pub_date

2013-07-02 00:00:00

pages

11061-6

issue

27

eissn

0027-8424

issn

1091-6490

pii

1302051110

journal_volume

110

pub_type

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