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The distribution of 45S rDNA sites in bird chromosomes suggests multiple evolutionary histories Genet. Mol. Biol.
Degrandi,Tiago Marafiga; Gunski,Ricardo José; Garnero,Analía del Valle; Oliveira,Edivaldo Herculano Correa de; Kretschmer,Rafael; Souza,Marcelo Santos de; Barcellos,Suziane Alves; Hass,Iris.
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-FISH was conducted for the first time. In most birds, the 45S rDNA clusters were located in a single pair of microchromosomes. Hence, the location of 45S rDNA in macrochromosomes, observed only in Neognathae species, seems to be a derived...
Tipo: Info:eu-repo/semantics/article Palavras-chave: FISH; Chromosome; Chromosome evolution; Cytogenetics; Aves.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400601
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Unexpected chromosomal alterations in Tayassu tajacu (Artiodactyla: Tayassuidae) in captivity Braz. J. Vet. Res. Anim. Sci.
Lima,José Fernando de Sousa; Guedes,Fátima Becker; Silva,Roxane Wirschum; Hass,Iris; Cavalli,Iglenir João; Silva,Juliana da; Freitas,Thales Renato de; Sbalqueiro,Ives José.
Wild animals have been used as bioindicators in situations in which the environment was exposed to chemical agents. In general, chemical agents may induce chromosomal aberrations, such as breaks and gaps. The peccary, Tayassu tajacu is a pig relative that exhibits a very stable karyotype with the only described alterations being of the form of the X chromosome. Chromosomal gaps and breaks were observed at high frequencies during cytogenetics analyses. These alterations were observed in the chromosomes autossomics. Reviews of the literature and of the data described herein suggests that an vermifuge, the ivermectin base, was the most likely cause of these chromosomal alterations.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tayassu; Karyotype; Chromosome; Chromosomal alterations.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962004000100002
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