8 documents found, page 1 of 1
The Bunocephalus coracoideus species complex (Siluriformes, Aspredinidae). Sign...
Ferreira, Milena; Garcia, Caroline; Matoso, D. A.; Jesus, Isac Silva de; Cioffi, Marcelo de Bello; Bertollo, Luiz Antônio Carlos; Zuanon, JansenBunocephalus is the most species-rich Aspredinidae genus, corresponding to a monophyletic clade with 13 valid species. However, many species have their classification put in question. Here, we analyzed individuals from four Amazonian populations of Bunocephalus coracoideus by cytogenetic and molecular procedures. The geographic distribution, genetic distances and karyotype data indicate that each population rep...
Chromosomal mapping of transposable elements of the rex family in the bristleno...
Favarato, Ramon Marin; Braga Ribeiro, Leila; Feldberg, Eliana; Matoso, D. A.Repetitive DNA sequences are present in the genome of basically every known organism, and transposable elements (TE) are one of the most representative sequences involved in chromosomal rearrangements and the genomic evolution of eukaryotes. In fish, the non-LTR retrotransposon TEs, Rex1, Rex3, and Rex6, are widely distributed in fish genomes and are the best-characterized TEs in several species. In the current...
Molecular taxonomy and evolutionary hypothesis concerning Astyanax fasciatus (C...
Matoso, D. A.; Silva, M. R. da; Artoni, Roberto Ferreira; Torres, Rodrigo AugustoA species complex hypothesis involving Astyanax fasciatus from southern Brazil was tested using 12S mtDNA sequences. Phylogenetic inferences were performed with maximum likelihood, maximum parsimony and Bayesian as phylogenetic methods and Hemigrammus bleheri as the outgroup. Besides 11 sequences from A. fasciatus, the data set was comprised of other partial 12S sequences including material from Astyanax altipa...
Chromosome mapping of repetitive sequences in four Serrasalmidae species (Chara...
Braga Ribeiro, Leila; Matoso, D. A.; Feldberg, ElianaThe Serrasalmidae family is composed of a number of commercially interesting species, mainly in the Amazon region where most of these fishes occur. In the present study, we investigated the genomic organization of the 18S and 5S rDNA and telomeric sequences in mitotic chromosomes of four species from the basal clade of the Serrasalmidae family: Colossoma macropomum, Mylossoma aureum, M. duriventre, and Piaractu...
Karyotypic variability in Iheringichthys labrosus (Teleostei, Pimelodidae) from...
Braga Ribeiro, Leila; Matoso, D. A.; Almeida, Mara Cristina de; Vicari, Marcelo Ricardo; Moraes-Neto, Américo; Svidnicki, Maria Carolina Costa MeloCytogenetic analyses were carried out in a populational sample of Iheringichthys labrosus from the Guaraúna River (Upper Tibagi River; Paraná State, Brazil) in order to provide a karyotypic comparison with another previously studied population from the Lower Tibagi River, characterized by the presence of 32m + 8sm + 6st + 10a (2n = 56, FN = 102) and occurrence of supernumerary chromosomes (80% of individuals). ...
Two genetic stocks of steindachneridion melanodermatum living in sympatry in na...
Matoso, D. A.; Silva, M. R. da; Cortinhas, Maria Cristina S.Silva; Cestari, Marta Margarete; Almeida, Mara Cristina de; Vicari, Marcelo RicardoSteindachneridion melanodermatum is a large Brazilian catfish, highly prized for sport fishing and for its meat. Specimens of this species, both caught in nature from Iguacu River and F1 fish born in captivity, were analyzed with regard to patterns of RAPD molecular markers. Genetic similarity ranged from 0.57 to 0.95; two groups were determined for the wild specimens. The results suggest different genetic line...
Fluorescence image analyzer - FLIMA: Software for quantitative analysis of fluo...
Silva, H. C.M.; Martins-Júnior, M. M.C.; Braga Ribeiro, Leila; Matoso, D. A.The Fluorescence Image Analyzer (FLIMA) software was developed for the quantitative analysis of images generated by fluorescence in situ hybridization (FISH). Currently, the images of FISH are examined without a coefficient that enables a comparison between them. Through GD Graphics Library, the FLIMA software calculates the amount of pixels on image and recognizes each present color. The coefficient generated ...
Karyotype variability in neotropical catfishes of the family pimelodidae (teleo...
Neto, Américo Moraes; Silva, M. R. da; Matoso, D. A.; Vicari, Marcelo Ricardo; Almeida, Mara Cristina de; Collares-Pereira, M. J.Karyotypic data are presented for four species of fish belonging to the Pimelodidae family. These species show a conserved diploid number, 2n = 56 chromosomes, with different karyotypic formulae. The analyzed species showed little amount of heterochromatin located preferentially in the centromeric and telomeric regions of some chromosomes. The nucleolus organizer regions activity (Ag-NORs) and the chromosomal l...