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Chromosome polymorphism of heterochromatin and nucleolar regions in two populations of the fish Astyanax bockmanni (Teleostei: Characiformes) Neotropical Ichthyology
Hashimoto,Diogo Teruo; Porto-Foresti,Fábio.
Karyotype and other chromosomal markers as revealed by C-banding and silver (Ag) impregnation in two Astyanax bockmanni populations (Barra Seca Stream and Campo Novo River) were examined. The diploid chromosome number 2n = 50 and nearly identical karyotypes were documented. C-banding revealed heterochromatic blocks on the terminal regions of some chromosomes, with high frequencies of polymorphisms. The Ag-impregnation showed that the nucleolus organizer regions (NORs) varied in number, location and organization. Astyanax bockmanni revealed chromosome characteristics similar those of the species complex "A. scabripinnis". Mechanisms that may be responsible for the high degree of polymorphism are discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish cytogenetics; Chromosomal rearrangements; Karyotype differentiation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000400016
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Cytogenetic markers as diagnoses in the identification of the hybrid between Piauçu (Leporinus macrocephalus) and Piapara (Leporinus elongatus) Genet. Mol. Biol.
Porto-Foresti,Fábio; Hashimoto,Diogo Teruo; Alves,Anderson Luis; Almeida,Rodrigo Braz Castilho; Senhorini,José Augusto; Bortolozzi,Jehud; Foresti,Fausto.
The genetic monitoring of interspecific hybrids involves the application of methodologies able to provide an easy and indubitable genetic characterization of both parental and hybrid individuals. In the present work, cytogenetic techniques were used to identify a hybrid lineage of "Piaupara" in order to caracterize them in relation to the parental species, Leporinus macrocephalus (piauçu) and L. elongatus (piapara). The cytogenetic analysis revealed that L. macrocephalus presented 2n = 54 chromosomes and a nucleolar organizer regions (NOR) at the telomere of the long arm of the submetacentric chromosome pair 2. Analysis of constitutive heterochromatin (C-banding) revealed a conspicuous block at the pericentromeric region on the long arm of a submetacentric...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Interspecific hybrid; Fish culture; Fish cytogenetics.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200005
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First report of a B chromosome in a natural population of Astyanax altiparanae (Characiformes, Characidae) Genet. Mol. Biol.
Hashimoto,Diogo Teruo; Gonçalves,Vanessa Regina; Bortolozzi,Jehud; Foresti,Fausto; Porto-Foresti,Fábio.
Several species of the genus Astyanax have already been genetically studied, and B-chromosomes have been considered to be an interesting feature in some species of this group. In the present paper we report, for the first time, the occurrence of a B microchromosome in a natural population of A. altiparanae. This additional genomic element was identified as an acrocentric chromosome, similar in size to the smallest chromosomal pairs of the standard karyotype. Analysis of the constitutive heterochromatin pattern by C-banding evidenced heterochromatic blocks located on centromeric, pericentromeric, and interstitial regions of some chromosomes, and also positive marks in a subtelocentric chromosomal pair that presented the short arms entirely heterochromatic....
Tipo: Info:eu-repo/semantics/article Palavras-chave: B chromosomes; Fish cytogenetics; Astyanax altiparanae.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200021
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Imputation of genetic composition for missing pedigree data in Serrasalmidae using morphometric data Scientia Agricola
Costa,Adriano Carvalho; Balestre,Marcio; Botelho,Hortência Aparecida; Freitas,Rilke Tadeu Fonseca de; Gomes,Richardson Cesar da Silva; Campos,Sérgio Augusto de Sousa; Foresti,Fábio Porto; Hashimoto,Diogo Teruo; Martins,Diego Galetti; Prado,Fernanda Dotti do; Mendonça,Maria Andreia Corrêa.
ABSTRACT This study aimed to impute the genetic makeup of individual fishes of Serrasalmidae family on the basis of body weight and morphometric measurements. Eighty-three juveniles, belonging to the genetic groups Pacu, Pirapitinga, Tambaqui, Tambacu, Tambatinga, Patinga, Paqui and Piraqui, were separated into 16 water tanks in a recirculation system, with two tanks per genetic group, where they remained until they reached 495 days of age. They were then weighed and analyzed according to the following morphometric parameters: Standard Length (SL), Head Length (HL), Body Height (BH), and Body Width (BW). The identity of each fish was confirmed with two SNPs and two mitochondrial markers. Two analyses were performed: one for the validating the imputation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Colossoma spp.; Piaractus spp.; Breeding; Mixture model; Round fish.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000600443
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