جستجوی مقالات مرتبط با کلیدواژه "ژنوم میتوکندریایی" در نشریات گروه "زیست شناسی"

Penaeidae shrimp species are the most important farmed aquatic animals from the crustacean group which have gained an important economic position in the world's aquaculture industry. In this study, complete mitochondrial genome sequences along with nucleotide and amino acid sequences of 13 PCGs per each genome from 10 important Penaeidae shrimp species were obtained from NCBI database and compared. According to the complete mitochondrial genome, the highest (88.5%) and lowest (76.4%) genetic similarity was found between Fenneropenaeus indicus and Fenneropenaeus merguiensis, and Metapenaeus ensis and Penaeus monodon, respectively. In phylogenetic analysis of the complete mitochondrial genome, two main clusters were established at the beginning of the phylogenetic tree. Metapenaeus ensis and Metapenaeus affinis were placed in one main cluster and other species in another main cluster. The results of the phylogenetic analysis of the nucleotide and amino acid sequences of the 13 PCGs showed that M. ensis and M. affinis, Litopenaeus stylirostris and Litopenaeus vannamei, and F. merguiensis and F. indicus species were grouped in different clusters, which confirms the results obtained from the comparison of the complete mitochondrial genome. Based on the results, mitochondrial genome sequences could be used for a wide range of detailed phylogenetic and genetic analyzes of different shrimp species.

The cave barb habitat is located in a Karst formation along the Sezar River. The springs on the walls of the Sezar River valley may provide a means for fish in surface waters to penetrate into the underground waters. These observations propose the probability for a migratory relationship between Garra gymnothorax in the Sezar River and the cave barbs (Garra typhlops and Garra lorestanensis). In addition, a variety of different body shapes including fusiform and slender body forms are observed among the cave fish. This phenotypical variation may be a sign of an unknown genetic diversity or could be attributed to the variable environmental conditions in different parts of the subterranean habitat. To clarify the situation, we used the sequences of mtDNA cytochrome oxidase subunit I and next generation sequencing method. The results showed that the fusiform and slender body shapes of G. typhlops and G. lorestanensis were not different with regard to their mtDNA and genomic compositions. Moreover, the analysis of the genomic their mtDNA and genomic compositions. Moreover, the analysis of the genomic showed that a limited level of gene flow (less than 3%) from G. gymnothorax probably existed in G. thyphlops. The low level of gene flow may be related to the lower fitness and adaptability of the surface dwelling fish to the subterranean life conditions.