Cytogenetic characterization of a supernumerary chromosome segment and of B-chromosomes in Astyanax scabripinnis (Teleostei, Characidae).
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.
Maistro
E L
EL
Instituto de Farmácia e Nutrição, Universidade de Alfenas, MG, Brazil. maistro.edson@unifenas.br
Oliveira
C
C
Foresti
F
F
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
D006570:Heterochromatin