title: Distribution of repetitive DNA sequences in chromosomes of five opisthorchid species (Trematoda, Opisthorchiidae).
abstract: Genomes of opisthorchid species are characterized by small size, suggesting a reduced amount of repetitive DNA in their genomes. Distribution of repetitive DNA sequences in the chromosomes of five species of the family Opisthorchiidae (Opisthorchis felineus 2n = 14 (Rivolta, 1884), Opisthorchis viverrini 2n = 12 (Poirier, 1886), Metorchis xanthosomus 2n = 14 (Creplin, 1846), Metorchis bilis 2n = 14 (Braun, 1890), Clonorchis sinensis 2n = 14 (Cobbold, 1875)) was studied with C- and AgNOR-banding, generation of microdissected DNA probes from individual chromosomes and fluorescent in situ hybridization on mitotic and meiotic chromosomes. Small-sized C-bands were discovered in pericentric regions of chromosomes. Ag-NOR staining of opisthorchid chromosomes and FISH with ribosomal DNA probe showed that karyotypes of all studied species were characterized by the only nucleolus organizer region in one of small chromosomes. The generation of DNA probes from chromosomes 1 and 2 of O. felineus and M. xanthosomus was performed with chromosome microdissection followed by DOP-PCR. FISH of obtained microdissected DNA probes on chromosomes of these species revealed chromosome specific DNA repeats in pericentric C-bands. It was also shown that microdissected DNA probes generated from chromosomes could be used as the Whole Chromosome Painting Probes without suppression of repetitive DNA hybridization. Chromosome painting using microdissected chromosome specific DNA probes showed the overall repeat distribution in opisthorchid chromosomes.
authors.affiliation: Institute of Cytology and Genetics Siberian Branch of RAS, Novosibirsk, Russia. kiramat@ngs.ru
authors.forename: Kira S
authors.initials: KS
authors.lastname: Zadesenets
authors.forename: Tatyana V
authors.initials: TV
authors.lastname: Karamysheva
authors.forename: Alexei V
authors.initials: AV
authors.lastname: Katokhin
authors.forename: Viatcheslav A
authors.initials: VA
authors.lastname: Mordvinov
authors.forename: Nikolay B
authors.initials: NB
authors.lastname: Rubtsov
mesh_terms: D000818:Animals; D002871:Chromosome Banding; D020223:Chromosome Painting; D002875:Chromosomes / Q000235:genetics; D015342:DNA Probes / Q000032:analysis / Q000648:ultrastructure; D018509:DNA, Helminth / Q000032:analysis*; D004275:DNA, Ribosomal / Q000032:analysis / Q000648:ultrastructure; D017404:In Situ Hybridization, Fluorescence; D059785:Karyotype; D008540:Meiosis; D042282:Microdissection; D008938:Mitosis; D009697:Nucleolus Organizer Region / Q000648:ultrastructure; D009890:Opisthorchidae / Q000166:cytology / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012091:Repetitive Sequences, Nucleic Acid; D013045:Species Specificity
chemical_list: D015342:DNA Probes; D018509:DNA, Helminth; D004275:DNA, Ribosomal