Produção Nacional
Revisado por pares
Karen Ventura, Patrícia Caroline Mary O’Brien, Camila do Nascimento Moreira, Yatiyo Yonenaga-Yassuda, M.A. Ferguson‐Smith,
Heterogeneous supernumerary chromosomes (Bs) are recognized in the oryzomyines Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens and Sooretamys angouya, representing about 10% of all known B-containing rodent species. They provide an outstanding model for understanding the origin, evolution and diversity of Bs in a phylogenetic context. Therefore, whole chromosome-specific probes were generated from flow-sorted Holochilus brasiliensis (HBR) autosomes 11 and 25+26 and ...
Tópico(s): Genetic diversity and population structure
2015 - Public Library of Science | PLoS ONE
Produção Nacional
Revisado por pares
Camilla Bruno Di‐Nizo, Karen Ventura, M.A. Ferguson‐Smith, Patricia O’Brien, Yatiyo Yonenaga-Yassuda, Maria José de Jesus Silva,
Oligoryzomys belongs to the tribe Oryzomyini, and contains about 22 species. Diploid numbers range from 2n = 44 in Oligoryzomys sp. 2 to 2n = 72 in O. utiaritensis and phylogenetic relationships are not well defined. The high morphological convergence leads to misidentification of taxonomic entities and the species are often identified by chromosomal characters. Until now, the genus has been studied only by classical cytogenetic approaches. To understand the chromosomal evolution of Oligoryzomys, we ...
Tópico(s): Genetic Mapping and Diversity in Plants and Animals
2015 - Public Library of Science | PLoS ONE
Produção Nacional
Revisado por pares
Miguel Tréfaut Rodrigues, Corine Bertolotto, Renata Cecília Amaro, Yatiyo Yonenaga-Yassuda, Eliza María Xavier Freire, Kátia C. M. Pellegrino,
Tópico(s): Animal Behavior and Reproduction
2014 - Elsevier BV | Molecular Phylogenetics and Evolution
Produção Nacional
Revisado por pares
Karen Ventura, Maria José de Jesus Silva, Lena Geise, Yuri Luiz Reis Leite, Ulyses FJ Pardiñas, Yatiyo Yonenaga-Yassuda, Guillermo D’Elía,
Abstract Background The phylogenetic position of the sigmodontine genus Abrawayaomys , historically assigned to the tribe Thomasomyini or considered a sigmodontine incertae sedis, was assessed on the basis of nuclear and mitochondrial DNA sequences obtained from four individuals from different localities in the Atlantic forest of Brazil. Sequences of Abrawayaomys were analyzed in the context of broad taxonomic matrices by means of maximum-likelihood (ML) and Bayesian analyses (BA). Results The phylogenetic ...
Tópico(s): Bat Biology and Ecology Studies
2013 - Biodiversity Research Center, Academia Sinica | Zoological studies
Produção Nacional
Revisado por pares
Karen Ventura, Yukie Sato-Kuwabara, Valéria Fagundes, Lena Geise, Yuri Luiz Reis Leite, Leonora Pires Costa, Maria José de Jesus Silva, Yatiyo Yonenaga-Yassuda, Miguel Tréfaut Rodrigues,
<i>Blarinomys breviceps </i>possesses cryptic and burrowing habits with poorly documented genetics and life history traits. Due to its rarity, only a few specimens and DNA sequences have been deposited in collections worldwide. Here, we present the most comprehensive cytogenetic and molecular characterization of this rare genus. Phylogenetic analyses based on partial cytochrome b sequences were performed, attempting to establish the relationships among individuals with distinct karyotypes ...
Tópico(s): Mollusks and Parasites Studies
2012 - Karger Publishers | Cytogenetic and Genome Research
Produção Nacional
Revisado por pares
Kátia C. M. Pellegrino, Miguel Tréfaut Rodrigues, D. James Harris, Yatiyo Yonenaga-Yassuda, Jack W. Sites,
Leposoma is a conspicuous component of leaf litter herpetofauna of South and Central American rainforests. The 15 bisexual and one parthenogenetic species are allocated to the parietale and scincoides groups based on morphology. Phylogenetic analyses of 1830 bp (mtDNA + nuclear) were performed on 63 specimens of four species from Amazonian and Panamanian rainforests, and six species and one undescribed form from the Atlantic Forest. Different methods of tree reconstruction were explored, with Anotosaura ...
Tópico(s): Ecology and Vegetation Dynamics Studies
2011 - Elsevier BV | Molecular Phylogenetics and Evolution
Produção Nacional
Revisado por pares
Renata Cecília Amaro, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda, Ana Carolina Carnaval,
Historical climatic refugia predict genetic diversity in lowland endemics of the Brazilian Atlantic rainforest. Yet, available data reveal distinct biological responses to the Last Glacial Maximum (LGM) conditions across species of different altitudinal ranges. We show that species occupying Brazil's montane forests were significantly less affected by LGM conditions relative to lowland specialists, but that pre-Pleistocene tectonics greatly influenced their geographic variation. Our conclusions are ...
Tópico(s): Genomics and Phylogenetic Studies
2011 - Elsevier BV | Molecular Phylogenetics and Evolution
Produção Nacional
Revisado por pares
Roberto do Val Vilela, Taís Machado, Karen Ventura, Valéria Fagundes, Maria de J Silva, Yatiyo Yonenaga-Yassuda,
The thin-spined porcupine, also known as the bristle-spined rat, Chaetomys subspinosus (Olfers, 1818), the only member of its genus, figures among Brazilian endangered species. In addition to being threatened, it is poorly known, and even its taxonomic status at the family level has long been controversial. The genus Chaetomys was originally regarded as a porcupine in the family Erethizontidae, but some authors classified it as a spiny-rat in the family Echimyidae. Although the dispute seems to be ...
Tópico(s): Bat Biology and Ecology Studies
2009 - Springer Science+Business Media | BMC Evolutionary Biology
Produção Nacional
Revisado por pares
Kátia C. M. Pellegrino, R.M.L. dos Santos, Miguel Tréfaut Rodrigues, M.M. Laguna, Renata Cecília Amaro, Yatiyo Yonenaga-Yassuda,
Chromosomes of the South American geckos <i>Gymnodactylus amarali</i> and <i>G. geckoides</i> from open and dry areas of the Cerrado and Caatinga biomes in Brazil, respectively, were studied for the first time, after conventional and AgNOR staining, CBG- and RBG-banding, and FISH with telomeric sequences. Comparative analyses between the karyotypes of open areas and the previously studied Atlantic forest species <i>G. darwinii</i> were also performed. The chromosomal polymorphisms ...
Tópico(s): Plant Virus Research Studies
2009 - Karger Publishers | Cytogenetic and Genome Research
Produção Nacional
Revisado por pares
Karen Ventura, Patrícia C. M. O’Brien, Yatiyo Yonenaga-Yassuda, M.A. Ferguson‐Smith,
Tópico(s): Evolution and Paleontology Studies
2009 - Springer Science+Business Media | Chromosome Research
Produção Nacional
Revisado por pares
Renata Cecília Amaro, Maria José de Jesus Silva, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda,
Tópico(s): Bat Biology and Ecology Studies
2007 - Springer Science+Business Media | Genetica
Produção Nacional
Revisado por pares
Roberta Paresque, Maria José de Jesus Silva, Yatiyo Yonenaga-Yassuda, Valéria Fagundes,
The karyotypes of 85 specimens of Oligoryzomys nigripes (Rodentia, Sigmodontinae) collected in the Cerrado and Atlantic Forest of seven states of Brazil were analyzed. Eighty four specimens presented a karyotype with 2n = 62 and one individual had 2n = 61 due to a monosomy of the X chromosome. High levels of intra- and inter-population karyotypic variability, due to sex chromosomes heteromorphisms and pericentric inversions in four autosomes (pairs 2, 3, 4 and 8), led to a variation of the autosomal arm ...
Tópico(s): Genetic diversity and population structure
2007 - Brazilian Society of Genetics | Genetics and Molecular Biology
Produção Nacional
Renata Cecília Amaro, Gabriel Skuk, Rafael O. de Sá, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda,
Eight species of the Neotropical genus Leptodactylus were karyologically studied: seven of them (L. gracilis, L. mystacinus, L. petersii, L. pustulatus, L. macrosternum, L. ocellatus, L. labyrinthicus) presented 2n=22 and L. silvanimbus showed a distinctive karyotype with 2n=24. Nucleolar organizer regions (Ag-NORs) were detected in two different pairs of chromosomes: pair 4 at the proximal region of the long arm of one individual of L. mystacinus from São Paulo state and of L. petersii; and pair ...
Tópico(s): Genetic diversity and population structure
2006 - UNIVERSIDADE DE SÃO PAULO | Phyllomedusa Journal of Herpetology
Produção Nacional
Revisado por pares
Karen Ventura, Maria José de Jesus Silva, Valéria Fagundes, Alexandre Uarth Christoff, Yatiyo Yonenaga-Yassuda,
Comparative studies among four species – <i>Akodon</i><i>azarae </i>(2n = 38), <i>A. lindberghi </i>(2n = 42), <i>A. paranaensis</i> (2n = 44) and <i>A. serrensis </i>(2n = 46) – employing classic cytogenetics (C- and G-bands) and fluorescence in situ hybridization with telomeric (TTAGGG)<sub>n</sub> sequencesare reported here. Non-telomeric signals in addition to the regular telomeric sites were detected in three species:<i>A. azarae</i>, <i>A. lindberghi</ ...
Tópico(s): Evolution and Paleontology Studies
2006 - Karger Publishers | Cytogenetic and Genome Research
Produção Nacional
Revisado por pares
Maria José de Jesus Silva, James L. Patton, Yatiyo Yonenaga-Yassuda,
Comparison of G-bands from 2n = 10 and 2n = 16 karyotypes of Akodon revealed tandem fusions, pericentric inversions and Robertsonian rearrangement in autosomes and addition/deletion of constitutive heterochromatin in sex chromosomes. Cytochrome-b sequences indicate that the 2n = 10 karyotype is a new species and show it to be a sister taxon of the 2n = 14, 2n = 15 and 2n = 16 karyotypes. Indeed, this group shows a particular evolutionary situation in which a unique taxonomic unit based on morphological data ...
Tópico(s): Animal Ecology and Behavior Studies
2006 - Brazilian Society of Genetics | Genetics and Molecular Biology
Kátia C. M. Pellegrino, Miguel Tréfaut Rodrigues, Aaron Waite, Mariana Morando, Yatiyo Yonenaga Yassuda, Jack W. Sites,
Phylogenetic analyses based on mtDNA cytochrome b were performed in 42 lizards of the Gymnodactylus darwinii complex from three regions within Brazil's Atlantic Forest. Mainland regions and continental shelf islands in the south-eastern range and mainland areas from the north-east were sampled. The criteria of maximum parsimony (MP), maximum likelihood (ML) and Bayesian methods were explored, with the robustness for nodes assessed by bootstrapping (MP and ML) and posterior probabilities (Bayesian searches). ...
Tópico(s): Genomics and Phylogenetic Studies
2005 - Oxford University Press | Biological Journal of the Linnean Society
Produção Nacional
Revisado por pares
Taís Machado, Maria José de Jesus Silva, E R Leal-Mesquita, Ana Paula Carmignotto, Yatiyo Yonenaga-Yassuda,
Spiny rats of the genus Proechimys are morphologically diverse, widely distributed and have diploid numbers ranging from 2n = 14-16 to 2n = 62. In this paper we present cytogenetical data and brief comments on morphological and biogeographical issues related to spiny rats. In our sample of 42 spiny rats collected from 12 Brazilian Amazonian tropical rainforest and the Cerrado (Brazilian savanna) sites we detected nine karyological entities: four different karyomorphs with 2n = 30, three with 2n = 28, one ...
Tópico(s): Genetic diversity and population structure
2005 - Brazilian Society of Genetics | Genetics and Molecular Biology
Produção Nacional
Revisado por pares
Maria José de Jesus Silva, Yatiyo Yonenaga-Yassuda,
Tópico(s): Genomics and Phylogenetic Studies
2004 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Valéria Fagundes, Juan Pedro M. Camacho, Yatiyo Yonenaga-Yassuda,
In this article we review the existing cytogenetic information on the polymorphic dot-like chromosomes in Trinomys iheringi, the only species in the family Echimyidae harboring them, and provide new data on the frequency, banding properties, meiotic behavior and DNA composition of these minute chromosomes. Since no individuals lacking these chromosomes have hitherto been found, one of the main properties of B chromosomes, i.e. dispensability, has not yet been tested, so that some reasonable doubt ...
Tópico(s): Genetic diversity and population structure
2004 - Karger Publishers | Cytogenetic and Genome Research
Produção Nacional
Revisado por pares
Maria José de Jesus Silva, Yatiyo Yonenaga-Yassuda,
B chromosomes are now known in eight Brazilian rodent species: <i>Akodon montensis, Holochilus brasiliensis, Nectomys rattus, N. squamipes, Oligoryzomys flavescens, Oryzomys angouya, Proechimys</i> sp. 2 and <i>Trinomys iheringi</i>. Typically these chromosomes are heterogeneous relative to size, morphology, banding patterns, presence/absence of NORs, and presence/absence of interstitial telomeric signals after FISH. In most cases, Bs are heterochromatic and late replicating. Active ...
Tópico(s): DNA Repair Mechanisms
2004 - Karger Publishers | Cytogenetic and Genome Research
Produção Nacional
Revisado por pares
Kátia C. M. Pellegrino, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda,
Tópico(s): Plant Virus Research Studies
2004 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Corine Bertolotto, Kátia C. M. Pellegrino, Yatiyo Yonenaga-Yassuda,
Although B chromosomes have been reported in many species of plants and animals, few studies have revealed the presence of these extra chromosomes in lizards. B chromosomes of lizards show different morphologies and sizes, from microchromosomes to macrochromosomes, or elements of intermediate size between smaller and larger A chromosomes, and number variability at intra- and inter-individual levels. In most cases, they are late-replicating and show either heterochromatic or no distinctive patterns ...
Tópico(s): Genetic diversity and population structure
2004 - Karger Publishers | Cytogenetic and Genome Research
Produção Nacional
Revisado por pares
Sanae Kasahara, Kaatia Cristina Machado Pellegrino, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda,
The chromosomes of 173 specimens representing eleven species of the Tropidurus forquatus group, from 33 localities in Brazil, were analysed after Giemsa staining, C-banding, NORs, and replication banding techniques.A karyotype with 2n = 36, including 12 macrochromosomes and 24 microchromosomes (12 M + 24 m), and sex determination of the XY:XX type were found in Tropidurus cocorobensis, T . erythrocephalus, T. etheridget, T. hispidus, T. hygomi, T. mon fanus, T. mucujensis, T. oreadicus, and T.forquatus. ...
Tópico(s): Parasite Biology and Host Interactions
2004 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Renata Cecília Amaro, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda,
Abstract Leptodactylus ocellatus, L. knudseni and L. pentadactylus were cyto-genetically analysed following conventional and Ag-NOR staining, C- and R-banding and FISH using the sequence (TTAGGG)n as probe. These species show similar karyotypes with 2n = 22 and Ag-NORs located in the short arm of pair 8. Species-specific C-banding patterns were detected involving centromeric, telomeric and interstitial bands. The comparative study of chromosomes after R-banding allowed the establishment of homeologies ...
Tópico(s): Plant Virus Research Studies
2004 - University of Florence | Caryologia
Produção Nacional
Revisado por pares
Valéria Fagundes, Alexandre Uarth Christoff, Yatiyo Yonenaga-Yassuda,
Tópico(s): Chromosomal and Genetic Variations
2004 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Carolina Elena Viña Bertolotto, Miguel Tréfaut Rodrigues, Gabriel Skuk, Yatiyo Yonenaga-Yassuda,
Tópico(s): Genomics and Phylogenetic Studies
2004 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Neide Santos, Valéria Fagundes, Yatiyo Yonenaga-Yassuda, María Carmen Trillo San José,
Tópico(s): Chromosomal and Genetic Variations
2004 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Cleide Leite-Silva, Neide Santos, Valéria Fagundes, Yatiyo Yonenaga-Yassuda, Maria José de Souza,
The karyotypes of the bat species Molossus ater, M. molossus (2n=48; NF=64) and Molossops planirostris (2n=34; NF=60) were analyzed by G-, C-banding, silver nitrate staining (AgNO3), base-specific fluorochromes and fluorescent in situ hybridization (FISH). The two species of Molossus presented the constitutive heterochromatin (CH) in the pericentromeric regions of all autosomes and in the X chromosome, while the Y chromosome was completely heterochromatic. Molossops planirostris showed conspicuous CH ...
Tópico(s): Genomics and Phylogenetic Studies
2003 - BioMed Central | Hereditas
Produção Nacional
Revisado por pares
Kátia C. M. Pellegrino, Miguel Tréfaut Rodrigues, Yatiyo Yonenaga-Yassuda,
Three “identical” haploid genomes (N = 22; 10M 12m) comprise the 3n = 66 (30M 36m) karyotype in the parthenogenetic gymnophthalmid lizard Leposoma percarinatum from Brazil. A hybridization event between a bisexual and a diploid unisexual species might explain the origin of L. percarinatum.
Tópico(s): Evolution and Genetic Dynamics
2003 - The Society for the Study of Amphibians and Reptiles | Journal of Herpetology
Produção Nacional
Revisado por pares
J.M. Pagnozzi, Albert David Ditchfield, Yatiyo Yonenaga-Yassuda,
The C-band pattern and the distribution of the (TTAGGG)<sub>n</sub> sequence after fluorescence in situ hybridization (FISH), were studied in eight species of Didelphidae marsupials: four species with 2n = 14 <i>(Marmosops parvidens</i>, <i>Marmosops incanus</i>, <i>Marmosa murina</i> and <i>Metachirus nudicaudatus</i>), two species with 2n = 18 <i>(Monodelphis domestica</i> and <i>M. americana)</i>, and two with 2n = 22 (<i>Didelphis marsupialis</ ...
Tópico(s): Primate Behavior and Ecology
2002 - Karger Publishers | Cytogenetic and Genome Research