The Applications of Nuclear Genes in Fish Molecular Systematic

Recently, it has become one of the hotspots to study the phylogeny and molecular evolution in fish taxonomy using molecular markers. In previous researches, mitochondrial genes (mtDNA) were commonly used as molecular markers; however disadvantages existed as well. In fish molecular phylogenetic researches, nuclear genes (nDNA) can be used instead of mitochondrial genes, by which the phylogenetic tree generates unexpected results on some occasions. In this article, we reviewed the frequently-used nDNA and their available applications in fish molecular phylogenetic studies, as well as the existed problems and the feasible resolutions.18S rDNA and 28S rDNA are conserved and often apply to the senior taxa, while in the study of the close phylogenetic relationship of species and different geographic group, researchers would like to choose ITSs and SINEs as molecular markers. For the further applications of nDNA, the comparison of the different usages of nDNA and mtDNA in fish phylogenetics were also compared.