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Studies on the Mitochondrial Genomics in Salmo trutta caspius Population in Three Rivers of Caspian Sea

Rezaei A, Akhshabi S and Jamalzadeh HR

Mitochondrial DNA is suitable for phylogenetic studies. Hence in this study mitochondrial DNA genes in Salmo trutta caspius were sequenced and deposited in Genbank. Six sequences of S.t. caspius mitochondrial ATPase 6 gene with accession nos. LC011387.1, LC154842- LC154847 and the full length of the mitochondrial genome in S.t. caspius (accession no. LC011387.1) were deposited in Genbank. Sequences were aligned between S.t. caspius and Salmo trutta by BLAST program. Although results showed a high homology between both sequences, but single nucleotide variations between ND genes in S.t. caspius and Salmo trutta were observed. S.t. caspius, S. trutta, and Salmo salar sequences were converted into a circular map in an online system named Organellar Genome DRAW (http://ogdraw. mpimp-golm.mpg.de). Maps created by OGDRAW were different for S.t. caspius, S. trutta and S. salar. Moreover, Maximum Parsimony method was conducted for evolutionary analysis using MEGA 6.0 program tree between S.t. caspius and other salmonids. The results showed that S.t. caspius, Salmo trutta, Salmo trutta fario and S. trutta are covered in a group. On the other hand, results of evolutionary analysis using Tajima's test were conducted in MEGA 6.0 program for three sequencing including, S.t. caspius, S.t. trutta specimen voucher Nor 00, and S.t. fario used as an outgroup for equality of evolutionary rate. Comparison of partial mitochondrial sequence in Iranian S.t. caspius population was performed between three regions [Tonekabon (Cheshmekileh Roud), Ramsar (Safa Roud) and Talesh (Nav roud)]. The results showed that except for one single nucleotide mutation in the partial sequence of mitochondria of S.t. caspius [Ramsar (Safa Roud)], there has been 100% homology between them. In conclusion, the mitochondrial genome homology of S.t. caspius and other salmonids were high, though some SNPs were observed between S.t. caspius and other salmonid species.