Characterization of the Atlantic salmon (Salmo salar) brain-type fatty acid binding protein (fabp7) genes reveals the fates of teleost fabp7 genes following whole genome duplications

Gene
Yvonne Y Y LaiWilliam S Davidson

Abstract

Whole genome duplications (WGDs) are considered to have been a driving force in the generation of evolutionary diversity that is characteristic of higher eukaryotes. The ancestor of salmonids underwent two additional WGDs compared to mammals, one (3R) at the base of the teleost radiation and another (4R) in the common ancestor of extant salmonids. We have chosen the fatty acid binding protein (fabp) gene family as a model to study the fate of duplicated genes in teleosts following WGDs. As previously described for zebrafish, we identified two copies (fabp7a and fabp7b) of the brain-type fabp gene in several fish including rainbow smelt, but there was only a single transcript in northern pike, the closest relative of the salmonids, and two rather than the expected four fabp7 genes in Atlantic salmon, rainbow trout and grayling. A phylogenetic analysis revealed that a loss of the fabp7a gene occurred in the common ancestor of the northern pike and salmonids after it had diverged from the rainbow smelt, and that the 4R WGD then gave rise to the fabp7bI and fabp7bII observed in salmonids. This is supported by genetic mapping that placed the Atlantic salmon duplicated fabp7b genes on homeologous chromosomes. There was no evidence of...Continue Reading

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Citations

Mar 7, 2015·Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics·Mehtap BayırJonathan M Wright
Jul 1, 2016·Genetics, Selection, Evolution : GSE·Hsin-Yuan TsaiRoss D Houston
Apr 9, 2017·Molecular Genetics and Genomics : MGG·Ananda B VenkatachalamJonathan M Wright
Apr 6, 2017·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Ronald B JohnsonMichael B Rust
Jun 12, 2020·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Caixia LeiYuanyou Li

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