02199nas a2200265   4500008004100000020001400041245016000055210006900215260001400284300000800298490000600306520130300312653000901615653002501624653002501649653002101674653001501695653002101710100002201731700003401753700003401787700003301821700003601854856004301890       2023                        eng d  a2410-388800aAssembly, Characterization, and Phylogenetic Relationships of Mitogenomes of Two Species of Mexican Trout (Oncorhynchus chrysogaster and O. mykiss nelsoni)0 aAssembly Characterization and Phylogenetic Relationships of Mito  c2023/04//  a1780 v83 aIn this study, the complete mitochondrial genomes of the Mexican golden trout, Oncorhynchus chrysogaster, and Nelson’s trout, O. mykiss nelson, were assembled and characterized. The mitogenomes were 16,655 bp and 16,661 bp long, respectively, and were composed of 13 protein-coding genes (PCGs), two ribosomal RNA genes, and 22 transfer RNA genes (all with typical ‘cloverleaf’ secondary structures). The length of the D-loop regions was among the longest found in Salmonids, and mitochondrial synteny in both species was identical to that reported in other Salmonids. Selective pressure analysis in the PCGs indicated that purifying selection, mainly among cox and nd genes families, likely generated the main differences between the two studied species. Nine tRNA genes showed slight differences relative to other O. mykiss subspecies, which were identical between the two study taxa. The origin of the light-strand replication has a loop that was especially large in O. mykiss nelsoni. Phylogenetic analysis indicated that O. chrysogaster and O. mykiss nelsoni are sister species, contrary to the expectation that O. chrysogaster would cluster with O. gilae. As previous studies have suggested, O. chrysogaster and O. mykiss nelsoni share common ancestry with North American trout species.10afish10aMexican golden trout10amitochondrial genome10aNelson’s trout10aSalmonidae10ataxonomic status1 aColín, Angélica1 aDel Río-Portilla, Miguel, A.1 aDe la Cruz, Fabiola, Lafarga-1 aDe la Mora, Genoveva, Ingle-1 aDe León, Francisco, J. García  uhttps://www.mdpi.com/2410-3888/8/4/178