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Possible Common Origin of B Chromosomes in Neotropical Fish (Siluriformes, Auchenipteridae) Reinforced by Repetitive DNA Mapping
Lui, Roberto Laridondo; Department of GeneticsTraldi, Josiane Baccarin; Blanco, Daniel Rodrigues; Margarido, Vladimir Pavan; Mariotto, Sandra; Department of Biology and ZoologyCentofante, Liano; Artoni, Roberto Ferreira; Department of Genetics and EvolutionMoreira Filho, Orlando.
  • Lui, Roberto Laridondo; Western Paraná State University. Center for Biological and Health Sciences. Cascavel. BR
  • Department of GeneticsTraldi, Josiane Baccarin; Federal University of Amazonas. Institute of Biological Sciences. Department of GeneticsTraldi, Josiane Baccarin. Manaus. BR
  • Blanco, Daniel Rodrigues; Federal Technological University of Paraná. Santa Helena. BR
  • Margarido, Vladimir Pavan; Western Paraná State University. Center for Biological and Health Sciences. Cascavel. BR
  • Mariotto, Sandra; Federal Institute of Education, Science and Technology of Mato Grosso. Cuiabá. BR
  • Department of Biology and ZoologyCentofante, Liano; Federal University of Mato Grosso. Institute of Biosciences. Department of Biology and ZoologyCentofante, Liano. Cuiabá. BR
  • Artoni, Roberto Ferreira; Ponta Grossa State University. Department of Structural, Molecular and Genetic Biology. Ponta Grossa. BR
  • Department of Genetics and EvolutionMoreira Filho, Orlando; Federal University of São Carlos. Center for Biological and Health Sciences. Department of Genetics and EvolutionMoreira Filho, Orlando. São Carlos. BR
Braz. arch. biol. technol ; 64: e21190494, 2021. tab, graf
Article in English | LILACS | ID: biblio-1249202
ABSTRACT
Abstract The aim of this paper was to present the second case of B chromosomes in Auchenipteridae (Trachelyopterus sp.), and to test the hypothesis that the B chromosomes of this species and Parauchenipterus galeatus might have a common origin, since these two species have phylogenetic proximity. Both species have 58 chromosomes in the A complement, heterochromatin preferentially located at terminal region of the most of chromosomes, simple Ag-NORs located at the short arm of a subtelocentric pair, which was confirmed by hybridization with 18S rDNA, two submetacentric pairs carrying 5S rDNA sites, and presence of B chromosomes. The B chromosomes of the two species are small, metacentric, and almost totally heterochromatic, with variation of number intra and interindividual. In addition, for the first time in fish, the telomeric sequence [TTAGGG]n was dispersed along the B chromosomes (both species). The [GATA]n microsatellite were scattered in all chromosomes of the A complement and absent in the B chromosomes, in both species. These aspects confirm the phylogenetic proximity between the genus Parauchenipterus and Trachelyopterus, and they suggest the hypothesis that the B chromosomes of the two species might have common origin, previous to the diversification of these genera.
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Full text: Available Index: LILACS (Americas) Main subject: Catfishes / Chromosome Mapping / Chromosomes, Human, 4-5 Language: English Journal: Braz. arch. biol. technol Journal subject: Biology Year: 2021 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal Institute of Education, Science and Technology of Mato Grosso/BR / Federal Technological University of Paraná/BR / Federal University of Amazonas/BR / Federal University of Mato Grosso/BR / Federal University of São Carlos/BR / Ponta Grossa State University/BR / Western Paraná State University/BR

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Full text: Available Index: LILACS (Americas) Main subject: Catfishes / Chromosome Mapping / Chromosomes, Human, 4-5 Language: English Journal: Braz. arch. biol. technol Journal subject: Biology Year: 2021 Type: Article Affiliation country: Brazil Institution/Affiliation country: Federal Institute of Education, Science and Technology of Mato Grosso/BR / Federal Technological University of Paraná/BR / Federal University of Amazonas/BR / Federal University of Mato Grosso/BR / Federal University of São Carlos/BR / Ponta Grossa State University/BR / Western Paraná State University/BR