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Evolutionary trends in animal ribosomal DNA loci: introduction to a new online database
J. Sochorová, S. Garcia, F. Gálvez, R. Symonová, A. Kovařík,
Jazyk angličtina Země Rakousko
Typ dokumentu časopisecké články, práce podpořená grantem
NLK
ProQuest Central
od 1997-03-01 do Před 1 rokem
Health & Medicine (ProQuest)
od 1997-03-01 do Před 1 rokem
- MeSH
- chromozomy MeSH
- databáze genetické MeSH
- internet MeSH
- internetový prohlížeč MeSH
- karyotyp MeSH
- lokus kvantitativního znaku * MeSH
- molekulární evoluce * MeSH
- ribozomální DNA genetika MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Ribosomal DNA (rDNA) loci encoding 5S and 45S (18S-5.8S-28S) rRNAs are important components of eukaryotic chromosomes. Here, we set up the animal rDNA database containing cytogenetic information about these loci in 1343 animal species (264 families) collected from 542 publications. The data are based on in situ hybridisation studies (both radioactive and fluorescent) carried out in major groups of vertebrates (fish, reptiles, amphibians, birds, and mammals) and invertebrates (mostly insects and mollusks). The database is accessible online at www.animalrdnadatabase.com . The median number of 45S and 5S sites was close to two per diploid chromosome set for both rDNAs despite large variation (1-74 for 5S and 1-54 for 45S sites). No significant correlation between the number of 5S and 45S rDNA loci was observed, suggesting that their distribution and amplification across the chromosomes follow independent evolutionary trajectories. Each group, irrespective of taxonomic classification, contained rDNA sites at any chromosome location. However, the distal and pericentromeric positions were the most prevalent (> 75% karyotypes) for 45S loci, while the position of 5S loci was more variable. We also examined potential relationships between molecular attributes of rDNA (homogenisation and expression) and cytogenetic parameters such as rDNA positions, chromosome number, and morphology.
Faculty of Science University of Hradec Kralove Hradecka 1285 CZ 50003 Hradec Kralove Czech Republic
Institut Botànic de Barcelona Passeig del Migdia s n 08038 Barcelona Catalonia Spain
Institute of Biophysics Academy of Sciences of the Czech Republic CZ 61265 Brno Czech Republic
Citace poskytuje Crossref.org
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