Repetitive DNA Sequences as an Indicator of the Level of Genetic Isolation in Fish

Shubina, E.A.; Ponomareva, E.V.; Klimov, A.V.; Klimova, A.V.; Kedrova, O.S.

Авторы: Shubina E.A., Ponomareva E.V., Klimov A.V., Klimova A.V., Kedrova O.S.
Журнал: Molecular Biology
Том: 49
Номер: 3
Год издания: 2015
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 358
Последняя страница: 368
DOI: 10.1134/S0026893315030152
Аннотация: Although the functional role is still unknown for most types of nuclear noncoding repetitive sequences, some of them proved to provide adequate phylogenetic and taxonomic markers for studying the genetic relationships of organisms at the species and withinspecies levels. Several markers were used in this work. First, microsatellite markers were used to examine populations varying in the extent of genetic subdivision in marine and anadromous fish, including the Chilean jack mackerel Trachurus murphyi, anadromous brown trout Salmo trutta, and isolated and anadromous char populations. Locus polymorphism was propor tional to the gene flow between populations in all cases. Second, satellite DNA was used to study the phylogenetic relationships within the genera Salmo, Oncorhynchus, Salvelinus, and Coregonus. Genetic distancesagreed well with the taxonomic relationships based on morphological traits and various biochemical markers and correlated with the evolutionary ages estimated for the groups by other markers. Third, RAPD PCR with a set of 20mer primers was performed to study the genus Coregonus and anadromous and isolated populations and species of the genus Salvelinus. The resulting phylogenetic trees may help to resolve some disputable taxonomic issues for the groups. A comparison showed that several RAPDdetected sequences contain conserved fragments of coding sequences and polymorphic repeats (minisatellites) from intergenic regions or introns. The finding point to a nonrandom nature of repetitive DNA divergence and may reflect the evolution of the fish groups examined. Heterochromatic satellite repeats were assumed to contribute to generating a reproductive barrier.
Добавил в систему: Шубина Елена Александровна

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Repetitive DNA Sequences as an Indicator of the Level of Genetic Isolation in Fishстатья

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