2020
DOI: 10.1590/1678-4685-gmb-2018-0331
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Abstract: The distribution of 45S rDNA cluster in avian karyotypes varies in different aspects, such as position, number of bearer chromosomes, and bearers being macro-or microchromosomes. The present study investigated the patterns of variation in the 45S rDNA-bearer chromosomes of birds in order to understand the evolutionary dynamics of the cluster configuration and its contribution to the evolution of bird karyotypes. A total of 73 bird species were analyzed, including both published data and species for which rDNA-… Show more

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Cited by 17 publications
(15 citation statements)
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“…Both species preserved a single pair of microchromosomes carrying ribosomal clusters, corroborating Degrandi et al [54]. In fact, most birds species show only one microchromosomal pair bearing the 18S rDNA sequence, including the Palaeognathae, such as the Ostrich (Struthioniformes) and the Rhea (Rheiformes), considered more basal in avian phylogeny [17,55], and also most Neognathae birds, such as the Chicken (Gallus gallus, Galliformes), some Doves and Pigeons (Columbiformes), and the Great Kiskadee (Pitangus sulphuratus, Passeriformes) [54,[56][57][58]. Interestingly, the 18S rDNA clusters are associated with the microsatellite sequence (CGG) 10 in the Common Potoo and the Scissor-tailed Nightjar (Figures 4B and 5C).…”
Section: Chromosomal Divergences Between Common Potoo and Scissor-taisupporting
confidence: 88%
“…Both species preserved a single pair of microchromosomes carrying ribosomal clusters, corroborating Degrandi et al [54]. In fact, most birds species show only one microchromosomal pair bearing the 18S rDNA sequence, including the Palaeognathae, such as the Ostrich (Struthioniformes) and the Rhea (Rheiformes), considered more basal in avian phylogeny [17,55], and also most Neognathae birds, such as the Chicken (Gallus gallus, Galliformes), some Doves and Pigeons (Columbiformes), and the Great Kiskadee (Pitangus sulphuratus, Passeriformes) [54,[56][57][58]. Interestingly, the 18S rDNA clusters are associated with the microsatellite sequence (CGG) 10 in the Common Potoo and the Scissor-tailed Nightjar (Figures 4B and 5C).…”
Section: Chromosomal Divergences Between Common Potoo and Scissor-taisupporting
confidence: 88%
“…Animals often show variability in the chromosomal position and the amount of accumulation of rDNA loci among and within species, e.g. [ 72 , 73 , 74 , 75 , 76 , 77 , 78 ]. The rDNA loci were detected only in one pair of chromosomes in most of the studied anguimorphan species, but their topology varies from a pair of microchromosomes in four species ( Barisia rudicollis , Gerrhonotus liocephalus , Xenosaurus platyceps , Xenosaurus rectocollaris ) to a pair of macrochromosomes in the remaining studied species ( Figure 8 and Figure 9 ).…”
Section: Discussionmentioning
confidence: 99%
“…cayana and G . guira [ 36 ], this single pair is a macrochromosome, not homologous to the one observed in C . ani and Coccyzus melacoryphus , which in turn bears 18S rDNA sites in two microchromosomes.…”
Section: Discussionmentioning
confidence: 99%