Document Detail


Chromosomes of European cyprinid fishes: comparative cytogenetics and chromosomal characteristics of ribosomal DNAs in nine Iberian chondrostomine species (Leuciscinae).
MedLine Citation:
PMID:  23329299     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Karyotypes and chromosomal features of both minor and major ribosomal RNA genes (rDNA) were investigated in nine Iberian chondrostomine species by fluorescent in situ hybridization (FISH) with 5S and 45S rDNA probes. All species presented invariably diploid values of 2n = 50 and the characteristic leuciscin karyotype pattern with 6-7 metacentric (m), 15-16 submetacentric (sm) and 3-4 subtelo- to acrocentric (st/a) chromosome pairs. The largest chromosome pair of the set was st/a as typical of Leuciscinae and no heteromorphic chromosomes could be unequivocally associated to sex determination. Achondrostoma occidentale and Pseudochondrostoma willkommii were cytogenetically characterized for the first time while Achondrostoma arcasii and Iberochondrostoma lemmingii were revisited regarding previous karyotype descriptions. Remarkable variability in number and location was observed for both molecular chromosome markers, especially within Achondrostoma and Iberochondrostoma genera. Clusters of 5S rDNA were mostly terminally associated to st/a chromosomes varying from four to eight positive signals, whilst NOR sites directly detected by the 45S rDNA probe were identified in sm chromosomes varying from three to six independent clusters. Frequent population bottlenecks in Mediterranean-type semiarid habitats were hypothesized to explain not only such extensive polymorphism which seems unique among leuciscin cyprinids but also the increased probability of fixation of rDNA translocation events.
Authors:
Carla Sofia A Pereira; Petr Ráb; Maria João Collares-Pereira
Related Documents :
24182409 - Reliability of 46,xx results on miscarriage specimens: a review of 1,222 first-trimeste...
23665879 - Molecular population genetics of inversion breakpoint regions in drosophila pseudoobscura.
23218009 - Condensin, chromatin crossbarring and chromosome condensation.
23125359 - Plant sex chromosome evolution.
24270429 - Chromosome mapping in barley by means of telotrisomic analysis.
23862039 - Implications of a chr7q21.11 microdeletion and the role of the pclo gene in development...
8793199 - Heterochromatin and ribosomal genes in asellus aquaticus (crust. isop.).
17609979 - Genetic and physical maps around the sex-determining m-locus of the dioecious plant asp...
19161139 - Familial 14.5 mb interstitial deletion 13q21.1-13q21.33: clinical and array-cgh study o...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-18
Journal Detail:
Title:  Genetica     Volume:  -     ISSN:  1573-6857     ISO Abbreviation:  Genetica     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370740     Medline TA:  Genetica     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Faculty of Sciences, Department of Animal Biology, Centre of Environmental Biology, University of Lisbon, Campo Grande, 1749-016, Lisbon, Portugal, cspereira@fc.ul.pt.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Working memory for music in patients with mild cognitive impairment and early stage Alzheimer's dise...
Next Document:  Berberine protects 6-hydroxydopamine-induced human dopaminergic neuronal cell death through the indu...