title: Cytogenetic characterization of a supernumerary chromosome segment and of B-chromosomes in Astyanax scabripinnis (Teleostei, Characidae).
abstract: The chromosome complement of a local population of Astyanax scabripinnis in Brazil was investigated with emphasis on the study of the heterochromatin attached to the A-chromosomes and present in the macro B-chromosome. Analysis after C-banding, silver and CMA3 staining, incorporation of 5-bromo-2'-deoxyuridine and chromosome digestion with nine restriction endonucleases revealed that the heterochromatin in the B-chromosomes was different from that found in the A-chromosomes. A polymorphism due to the presence of a supernumerary heterochromatic chromosome segment was observed in the population investigated. Some aspects related to the origin of the heterochromatin polymorphism in Astyanax scabripinnis are discussed.
authors.affiliation: Instituto de Farmácia e Nutrição, Universidade de Alfenas, MG, Brazil. maistro.edson@unifenas.br
authors.forename: E L
authors.initials: EL
authors.lastname: Maistro
authors.forename: C
authors.initials: C
authors.lastname: Oliveira
authors.forename: F
authors.initials: F
authors.lastname: Foresti
mesh_terms: D000818:Animals; D001938:Brazil; D002875:Chromosomes / Q000235:genetics*; D003582:Cytogenetics; D005260:Female; D005399:Fishes / Q000235:genetics*; D005828:Genetics, Population; D006570:Heterochromatin / Q000235:genetics; D007621:Karyotyping; D008297:Male; D011110:Polymorphism, Genetic
chemical_list: D006570:Heterochromatin