GEPHE SUMMARY Print
Entry Status
Published
GepheID
GP00001469
Main curator
Prigent
PHENOTYPIC CHANGE
Trait Category
Trait State in Taxon A
other teleost Percomorphaceae fishes (fugu & stickleback)
Trait State in Taxon B
Pacific bluefin tuna
Ancestral State
Taxon A
Taxonomic Status
Taxon A
Common Name
-
Synonyms
-
Rank
no rank
Lineage
Show more ... Euteleostomi; Actinopterygii; Actinopteri; Neopterygii; Teleostei; Osteoglossocephalai; Clupeocephala; Euteleosteomorpha; Neoteleostei; Eurypterygia; Ctenosquamata; Acanthomorphata; Euacanthomorphacea
NCBI Taxonomy ID
is Taxon A an Infraspecies?
No
Taxon B
Common Name
Pacific bluefin tuna
Synonyms
Thunnus orientalis orientalis; Thunnus thynnus orientalis; Pacific bluefin tuna; North Pacific bluefin tuna; northern bluefin tuna; Thunnus orientalis (Temminck & Schlegel, 1844)
Rank
species
Lineage
Show more ... Clupeocephala; Euteleosteomorpha; Neoteleostei; Eurypterygia; Ctenosquamata; Acanthomorphata; Euacanthomorphacea; Percomorphaceae; Pelagiaria; Scombriformes; Scombridae; Scombrinae; Thunnini; Thunnus
NCBI Taxonomy ID
is Taxon B an Infraspecies?
No
GENOTYPIC CHANGE
Presumptive Null
No
Molecular Type
Aberration Type
SNP
SNP Coding Change
Nonsynonymous
Molecular Details of the Mutation
p.E122Q (G>C) in four of five genes
Experimental Evidence
Taxon A Taxon B Position
Codon - - -
Amino-acid - - -
Authors
Nakamura Y; Mori K; Saitoh K; Oshima K; Mekuchi M; Sugaya T; Shigenobu Y; Ojima N; et al. ... show more
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.
Additional References
EXTERNAL LINKS
COMMENTS
by gene duplication and conversion there are 5 RH2 genes in tuna and four of which have the same substitution
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