The mechanisms determining the nucleolar-organizing regions inactivation of domestic horse chromosomes. 2007

E Slota, and M Wnuk, and M Bugno, and A Pienkowska-Schelling, and C Schelling, and A Bratus, and Z Kotylak
Department of Immuno- and Cytogenetics, National Research Institute of Animal Production, Balice n. Krakow, Poland. eslota@izoo.krakow.pl

Cytogenetic investigations of the nucleolar-organizing regions (NORs) show that there is variation in the transcriptional activity of rDNA in many organisms. As a consequence, genetic polymorphism of these regions has been detected. The aim of the present study was to evaluate the hypothetic genetic mechanisms determining the NORs polymorphism of the domestic horse chromosomes. Molecular cytogenetic analyses were carried out on Hucul horses and the following techniques were used: fluorescence in situ hybridization (FISH), telomere primed in situ synthesis (PRINS), in situ nick-translation with HpaII, silver staining (AgNOR) and C-banding technique (CBG). The obtained results suggest that variation in the number and size of silver deposits is related to the number of rDNA copies, DNA methylation and the localization of ribosomal DNA loci in telomeric regions. Moreover, we have found that chromosome pairs 28 and 31 are characterized by higher variation in the NORs number.

UI MeSH Term Description Entries
D009697 Nucleolus Organizer Region The chromosome region which is active in nucleolus formation and which functions in the synthesis of ribosomal RNA. Nucleolar Organizer,Nucleolar Organizers,Nucleolus Organizer Regions,Organizer Region, Nucleolus,Organizer Regions, Nucleolus,Organizer, Nucleolar,Organizers, Nucleolar,Region, Nucleolus Organizer,Regions, Nucleolus Organizer
D005786 Gene Expression Regulation Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation. Gene Action Regulation,Regulation of Gene Expression,Expression Regulation, Gene,Regulation, Gene Action,Regulation, Gene Expression
D006736 Horses Large, hoofed mammals of the family EQUIDAE. Horses are active day and night with most of the day spent seeking and consuming food. Feeding peaks occur in the early morning and late afternoon, and there are several daily periods of rest. Equus caballus,Equus przewalskii,Horse, Domestic,Domestic Horse,Domestic Horses,Horse,Horses, Domestic
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D020732 Cytogenetic Analysis Examination of CHROMOSOMES to diagnose, classify, screen for, or manage genetic diseases and abnormalities. Following preparation of the sample, KARYOTYPING is performed and/or the specific chromosomes are analyzed. Cytogenetic Techniques,Molecular Cytogenetic Techniques,Cytogenetic Technics,Molecular Cytogenetic Technics,Analyses, Cytogenetic,Analysis, Cytogenetic,Cytogenetic Analyses,Cytogenetic Technic,Cytogenetic Technic, Molecular,Cytogenetic Technics, Molecular,Cytogenetic Technique,Cytogenetic Technique, Molecular,Cytogenetic Techniques, Molecular,Molecular Cytogenetic Technic,Molecular Cytogenetic Technique,Technic, Cytogenetic,Technic, Molecular Cytogenetic,Technics, Cytogenetic,Technics, Molecular Cytogenetic,Technique, Cytogenetic,Technique, Molecular Cytogenetic,Techniques, Cytogenetic,Techniques, Molecular Cytogenetic
D033481 Chromosomes, Mammalian Complex nucleoprotein structures which contain the genomic DNA and are part of the CELL NUCLEUS of MAMMALS. Chromosome, Mammalian,Mammalian Chromosome,Mammalian Chromosomes

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