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Title: Variability of 18S rDNA locus among Symphysodon fishes: chromosomal rearrangements
Authors: Gross, Maria Claudia
Schneider, Carlos Henrique
Targino Valente, Guilherme
Martins, Cesar Henrique Rossinoli
Feldberg, Eliana
Keywords: Cichlidae
Symphysodon Aequifasciata
Symphysodon Discus
Ribosome Dna
Rna 18s
Chromosome Aberration
Chromosome Nor
Dna Probe
In Situ Hybridization, Fluorescence
Genetic Marker
Polymorphism, Genetic
Evolution, Molecular
Polymerase Chain Reaction
Silver Staining
Chromosome Aberrations
Dna Probes
Ribosomal Dna
Evolution, Molecular
Genetic Markers
In Situ Hybridization, Fluorescence
Nucleolus Organizer Region
Polymerase Chain Reaction
Polymorphism, Genetic
Rna, Ribosomal, 18s
Silver Staining
Issue Date: 2010
metadata.dc.publisher.journal: Journal of Fish Biology
metadata.dc.relation.ispartof: Volume 76, Número 5, Pags. 1117-1127
Abstract: Three species of cichlids belonging to the genus Symphysodon have demonstrated interspecific and intraspecific variation in nucleolus organizer regions (NOR) detected with silver nitrate. In order to understand the evolution of this marker in the genus, the structural variability of these sequences in mitotic chromosomes from Symphysodon aequifasciatus, Symphysodon discus and Symphysodon haraldi was investigated using both silver nitrate impregnation and hybridization of the 18S rRNA gene probe. For the three species, the two markers were intraspecifically and interspecifically variable both in the number and in the size of the sites. This polymorphism may stem from duplications and translocations, which suggests that structural chromosome rearrangements effectively act in the karyoevolution of wild Symphysodon species and may have favoured the adaptability of these fishes to diverse aquatic environments in the Amazon. © 2010 The Authors. Journal compilation © 2010 The Fisheries Society of the British Isles.
metadata.dc.identifier.doi: 10.1111/j.1095-8649.2010.02550.x
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