12 documents found, page 1 of 2
Intriguing evidence of translocations in Discus fish (Symphysodon, Cichlidae) a...
Gross, Maria Claudia; Feldberg, Eliana; Cella, Doralice Maria; Schneider, Marielle Cristina; Schneider, Carlos Henrique; Porto, Jorge Ivan RebeloAs part of a program to understand the genetics of Amazonian ornamental fish, classical cytogenetics was used to analyze Symphysodon aequifasciatus, S. discus and S. haraldi, popular and expensive aquarium fishes that are endemic to the Amazon basin. Mitotic analyses in Symphysodon have shown some odd patterns compared with other Neotropical cichlids. We have confirmed that Symphysodon species are characterized...
Heterochromatin variation and LINE-1 distribution in Artibeus (Chiroptera, Phyl...
Souza, Érica Martinha Silva de; Gross, Maria Claudia; Silva, Carlos Eduardo Faresin e; Sotero-Caio, Cibele Gomes; Feldberg, ElianaSpecies in the subgenus Artibeus Leach, 1821 are widely distributed in Brazil. Conserved karyotypes characterize the group with identical diploid number and chromosome morphology. Recent studies suggested that the heterochromatin distribution and accumulation patterns can vary among species. In order to assess whether variation can also occur within species, we have analyzed the chromosomal distribution of cons...
Comparative cytogenetics of two of the smallest Amazonian fishes: Fluviphylax s...
Souza, E. R.; Braga Ribeiro, Leila; Feldberg, Eliana; Farias, Izeni P.; Hrbek, Tomas; Gross, Maria ClaudiaThe genus Fluviphylax Whitley, 1965 is comprized of five valid species (F. pygmaeus Myers et Carvalho, 1955, F. zonatus, F. simplex, F. obscurus Costa, 1996, and F. palikur Costa et Le Bail, 1999), which are endemic to the Amazon region. These fishes are the smallest known South American vertebrates and among the smallest know vertebrates on Earth. All species but the type F. pygmaeus have been described in lat...
Intense genomic reorganization in the genus Oecomys (Rodentia, Sigmodontinae): ...
Gomes Júnior, Renan Gabriel; Schneider, Carlos Henrique; Lira, Thatianna de; Carvalho, Natália Dayane Moura; Feldberg, ElianaOecomys Thomas, 1906 is one of the most diverse and widely distributed genera within the tribe Oryzomyini. At least sixteen species in this genus have been described to date, but it is believed this genus contains undescribed species. Morphological, molecular and cytogenetic study has revealed an uncertain taxonomic status for several Oecomys species, suggesting the presence of a complex of species. The present...
Repetitive sequences: The hidden diversity of heterochromatin in prochilodontid...
Terêncio, Maria Leandra; Schneider, Carlos Henrique; Gross, Maria Claudia; Carmo, Edson Júnior do; Nogaroto, Viviane; Almeida, Mara Cristina deThe structure and organization of repetitive elements in fish genomes are still relatively poorly understood, although most of these elements are believed to be located in heterochromatic regions. Repetitive elements are considered essential in evolutionary processes as hotspots for mutations and chromosomal rearrangements, among other functions - thus providing new genomic alternatives and regulatory sites for...
Evolutionary dynamics of retrotransposable elements Rex1, Rex3 and Rex6 in neot...
Schneider, Carlos Henrique; Gross, Maria Claudia; Terêncio, Maria Leandra; Carmo, Edson Júnior do; Martins, Cesar Henrique Rossinoli; Feldberg, ElianaBackground: Transposable elements (TEs) have the potential to produce broad changes in the genomes of their hosts, acting as a type of evolutionary toolbox and generating a collection of new regulatory and coding sequences. Several TE classes have been studied in Neotropical cichlids; however, the information gained from these studies is restricted to the physical chromosome mapping, whereas the genetic diversi...
Is the karyotype of neotropical boid snakes really conserved? Cytotaxonomy, chr...
Viana, Patrik Ferreira; Braga Ribeiro, Leila; Souza, George Myller; Menezes Chalkidis, Hipocrátes de; Gross, Maria Claudia; Feldberg, ElianaBoids are primitive snakes from a basal lineage that is widely distributed in Neotropical region. Many of these species are both morphologically and biogeographically divergent, and the relationship among some species remains uncertain even with evolutionary and phylogenetic studies being proposed for the group. For a better understanding of the evolutionary relationship between these snakes, we cytogenetically...
Cytotaxonomy and karyoevolution of the genus Crenicichla (Perciformes, Cichlidae)
Benzequem, Denise Corrêa; Feldberg, Eliana; Porto, Jorge Ivan Rebelo; Gross, Maria Claudia; Zuanon, JansenKaryotypes of six cichlid species of the genus Crenicichla were investigated. The species C. cincta, C. inpa, C. reticulata, C. lugubris, and C. cf. johanna were collected from Amazon basin, and C. britskii was collected from the Paraná-Paraguai basin. All of the analysed species showed 2n = 48 chromosomes; however, C. cincta, C. lugubris, C. cf. johanna, and C. britskii had a karyotype formula of 8M-SM+40ST-A,...
Chromosomal distribution of microsatellite repeats in Amazon cichlids genome (P...
Schneider, Carlos Henrique; Gross, Maria Claudia; Terêncio, Maria Leandra; Tavares, Édika Sabrina Girão Mitozo de; Martins, Cesar Henrique RossinoliFish of the family Cichlidae are recognized as an excellent model for evolutionary studies because of their morphological and behavioral adaptations to a wide diversity of explored ecological niches. In addition, the family has a dynamic genome with variable structure, composition and karyotype organization. Microsatellites represent the most dynamic genomic component and a better understanding of their organiz...
Comparative cytogenetics of Carnegiella marthae and Carnegiella strigata (Chara...
Terêncio, Maria Leandra; Schneider, Carlos Henrique; Gross, Maria Claudia; Silva, Adailton Moreira da; Feldberg, Eliana; Porto, Jorge Ivan RebeloComparative cytogenetic analyses of hatchetfishes Camegiella marthae and Camegiella strigata (Gasteropelecidae) from the Rio Negro basin were performed using conventional Giemsa staining, silver (Ag)-staining and C-banding. The diploid chromosome numbers of both species equaled 2n = 50 but their karyotypes were distinct. We found evidence for sex chromosomes in C. marthae since karyotype of males presented 20 M...