NDLI: Repetitive DNA sequences as an indicator of the level of genetic isolation in fish

Content Provider	Springer Nature Link
Author	Shubina, E. A. Pomareva, E. V. Klimov, A. V. Klimova, A. V. Kedrova, O. S.
Copyright Year	2015
Abstract	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 within-species 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 proportional 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 distances agreed 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 20-mer 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 RAPD-detected 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.
Starting Page	358
Ending Page	368
Page Count	11
File Format	PDF
ISSN	00268933
Journal	Molecular Biology
Volume Number	49
Issue Number	3
e-ISSN	16083245
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-06-17
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	DNA tandem repeats microsatellite and multilocus analyses fish genetic isolation speciation Life Sciences Biochemistry Human Genetics
Content Type	Text
Resource Type	Article
Subject	Structural Biology Biophysics

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