title: Karyotype Diversity in Doradidae (Siluriformes, Doradoidea) and Presence of the Heteromorphic ZZ/ZW Sex Chromosome System in the Family.
abstract: Karyotypes and other chromosomal markers as revealed by conventional and molecular cytogenetic protocols in four species of the catfish family Doradidae from the Araguaia-Tocantins river basin, namely Hassar wilderi, Leptodoras cataniae, Tenellus leporhinus and Tenellus trimaculatus were examined. All species had diploid chromosome number 2n = 58 and karyotypes dominated by biarmed chromosomes, simple NOR phenotype, that is, one chromosome pair bearing this site in terminal position, but some differences in karyotypes and distribution of constitutive heterochromatin, position of rDNA sites. Such characteristics appeared species-specific. A ZZ/ZW sex chromosome system was found in Tenellus trimaculatus, resulting likely from the amplification of the heterochromatin, followed by a paracentric inversion. Our results confirmed low karyotype differentiation observed until now among representatives of this endemic catfish family.
authors.affiliation: 1 Laboratório de Citogenética Animal, Departamento de Biologia Geral, CCB, Universidade Estadual de Londrina , Londrina, Brazil .
authors.forename: Fábio Hiroshi
authors.initials: FH
authors.lastname: Takagui
authors.affiliation: 2 Laboratório de Ictiologia, Instituto de Ciências Biológicas e da Saúde, Universidade Federal de Mato Grosso , Pontal do Araguaia, Brazil .
authors.forename: Lucas Ferreira de
authors.initials: LF
authors.lastname: Moura
authors.affiliation: 3 Laboratório de Citogenética e Genética Animal, Instituto de Biociências, Universidade Federal de Mato Grosso , Cuiabá, Brazil .
authors.forename: Daniela Cristina
authors.initials: DC
authors.lastname: Ferreira
authors.affiliation: 3 Laboratório de Citogenética e Genética Animal, Instituto de Biociências, Universidade Federal de Mato Grosso , Cuiabá, Brazil .
authors.forename: Liano
authors.initials: L
authors.lastname: Centofante
authors.affiliation: 4 Programa de Pós Graduação em Ecologia e Conservação da Biodiversidade, Instituto de Biociências, Universidade Federal de Mato Grosso , Cuiabá, Brazil .
authors.forename: Carla de Andrade
authors.initials: CA
authors.lastname: Vitorino
authors.affiliation: 5 Universidade Tecnológica Federal do Paraná , Prolongamento da Rua Cerejeira s/n, Paraná, Brazil .
authors.forename: Vanessa
authors.initials: V
authors.lastname: Bueno
authors.affiliation: 6 Laboratório de Citogenética de peixes, Centro de Ciências Biológicas e da Saúde, Universidade Estadual do Oeste do Paraná , Paraná, Brazil .
authors.forename: Vladimir Pavan
authors.initials: VP
authors.lastname: Margarido
authors.affiliation: 3 Laboratório de Citogenética e Genética Animal, Instituto de Biociências, Universidade Federal de Mato Grosso , Cuiabá, Brazil .|4 Programa de Pós Graduação em Ecologia e Conservação da Biodiversidade, Instituto de Biociências, Universidade Federal de Mato Grosso , Cuiabá, Brazil .
authors.forename: Paulo Cesar
authors.initials: PC
authors.lastname: Venere
mesh_terms: D000818:Animals; D002397:Catfishes / Q000145:classification / Q000235:genetics*; D004275:DNA, Ribosomal / Q000235:genetics; D005260:Female; D006570:Heterochromatin; D059785:Karyotype; D007621:Karyotyping / Q000379:methods / Q000662:veterinary*; D008297:Male; D012730:Sex Chromosomes / Q000502:physiology*; D013045:Species Specificity
chemical_list: D004275:DNA, Ribosomal; D006570:Heterochromatin
keywords: chromosomal evolution; chromosomal markers; fish cytogenetics; heterochromatin; rDNA-FISH