Consulta: subjectFacets:"Chromosome"
Registros recuperados: 40
Data/hora: 10/06/2024 18:14:05

Combined association of Presenilin-1 and Apolipoprotein E polymorphisms with maternal meiosis II error in Down syndrome births
Provedor de dados: 74
Autores: Bhaumik,Pranami; Ghosh,Priyanka; Ghosh,Sujay; Feingold,Eleanor; Ozbek,Umut; Sarkar,Biswanath; Dey,Subrata Kumar.
Abstract Alzheimer's disease and Down syndrome often exhibit close association and predictively share common genetic risk-factors. Presenilin-1 (PSEN-1) and Apolipoprotein E (APOE) genes are associated with early and late onset of Alzheimer's disease, respectively. Presenilin −1 is involved in faithful chromosomal segregation. A higher frequency of the APOE ε4 allele has been reported among young mothers giving birth to Down syndrome children. In this study, 170 Down syndrome patients, grouped according to maternal meiotic stage of nondisjunction and maternal age at conception, and their parents were genotyped for PSEN-1 intron-8 and APOE polymorphisms. The control group consisted of 186 mothers of karyotypically normal children. The frequencies of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Genetic polymorphism; Karyotype; Meiosis; Microsatellite markers.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000400577

Karyotypic description of the stingless bee Oxytrigona cf. flaveola (Hymenoptera, Apidae, Meliponina) of a colony from Tangará da Serra, Mato Grosso State, Brazil
Provedor de dados: 74
Autores: Krinski,Diones; Fernandes,Anderson; Rocha,Marla Piumbini; Pompolo,Silvia das Graças.
The aim was to broaden knowledge on the cytogenetics of the subtribe Meliponina, by furnishing cytogenetic data as a contribution to the characterization of bees from the genus Oxytrigona. Individuals of the species Oxytrigona cf. flaveola, members of a colony from Tangará da Serra, Mato Grosso State, Brazil, were studied. The chromosome number was 2n = 34, distributed among four chromosomal morphologies, with the karyotype formula 8m+8sm+16st+2t. Size heteromorphism in the first metacentric pair, subsequently confirmed by sequential staining with fluorochrome (DA/DAPI/CMA3), was apparent in all the examined individuals The nucleolar organizing regions (NORs) are possibly located in this metacentric chromosome pair. These data will contribute towards a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Heteromorphism; Fluorochrome.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300020

Cytogenetic characterization of the strongly electric Amazonian eel, Electrophorus electricus (Teleostei, Gymnotiformes), from the Brazilian rivers Amazon and Araguaia
Provedor de dados: 74
Autores: Fonteles,Soraia B.A.; Lopes,Carlos E.; Akama,Alberto; Fernandes,Flora M.C.; Porto-Foresti,Fábio; Senhorini,José A.; Daniel-Silva,Maria de Fátima Z.; Foresti,Fausto; Almeida-Toledo,Lurdes Foresti de.
A karyotype analysis of the electric eel, Electrophorus electricus (Teleostei, Gymnotiformes), a strongly electric fish from northern South America, is presented. Two female specimens were analyzed, one from the Amazon River and one from the Araguaia River. The specimens had a chromosomal number of 2n = 52 (42M-SM + 10A). C-bands were present in a centromeric and pericentromeric position on part of the chromosomes; some interstitial C-bands were also present. Heteromorphic nucleolus organizer regions (NORs) were detected in two chromosome pairs of the specimen from the Amazon River. The chromosome number and karyotype characteristics are similar to those of other Gymnotidae species. The genera Electrophorus and Gymnotus are positioned as the basal lineages...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Fish; Gymnotidae; Electric eel.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200010

Chromosomal similarity between the Scaly-headed parrot (Pionus maximiliani), the Short-tailed parrot (Graydidascalus brachyurus) and the Yellow-faced parrot (Salvatoria xanthops) (Psittaciformes: Aves): a cytotaxonomic analysis
Provedor de dados: 74
Autores: Caparroz,Renato; Duarte,José Maurício Barbanti.
Behavior, morphology, allozyme studies and DNA hybridization and sequencing data all suggest the independent evolution of the Old and New World parrots and support tribe status for the American species, although the phylogenetic relationships within this tribe are still poorly understood. A previous study has shown that the Yellow-faced parrot (Amazona xanthops Spix 1824) exhibits large karyotypic differences compared to the other Amazona species and suggested that this species should be renamed Salvatoria xanthops, although the relationships between S. xanthops and the other New World parrots remain unclear. In the present work, we describe the karyotype of the Scaly-headed parrot (Pionus maximiliani, Kuhl 1820) and the karyotype and C-banding pattern of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Karyotype; Cytotaxonomy; Psittaciformes; Parrots.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000400010

Demarcation of informative chromosomes in tropical sweet corn inbred lines using microsatellite DNA markers
Provedor de dados: 74
Autores: Kashiani,Pedram; Saleh,Ghizan; Panandam,Jothi Malar; Abdullah,Nur Ashikin Psyquay; Selamat,Ahmad.
A study of genetic variation among 10 pairs of chromosomes extracted from 13 tropical sweet corn inbred lines, using 99 microsatellite markers, revealed a wide range of genetic diversity. Allelic richness and the number of effective alleles per chromosome ranged from 2.78 to 4.33 and 1.96 to 3.47, respectively, with respective mean values of 3.62 and 2.73. According to the Shannon's information index (I) and Nei's gene diversity coefficient (Nei), Chromosome 10 was the most informative chromosome (I = 1.311 and Nei = 0.703), while Chromosome 2 possessed the least (I = 0.762 and Nei = 0.456). Based on linkage disequilibrium (LD) measurements for loci less than 50 cM apart on the same chromosome, all loci on Chromosomes 1, 6 and 7 were in equilibrium. Even...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microsatellite; Inbred line; Chromosome; Genetic variation; Linkage disequilibrium.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000400012

Nuclear DNA content determination in Characiformes fish (Teleostei, Ostariophysi) from the Neotropical region
Provedor de dados: 74
Autores: Carvalho,Margarida Lima; Oliveira,Claudio; Navarrete,Maria Clara; Froehlich,Otávio; Foresti,Fausto.
In the present study, nuclear DNA content was analyzed in 53 species of Characiformes fish from the Neotropical region. Diploid number ranged from 2n = 48 in Astyanax fasciatus, Gymnocorymbus ternetzi and Hyphessobrycon griemi to 2n = 102 in Potamorhina squamoralevis, with a modal number of 54 chromosomes. Nuclear DNA content ranged from 1.70 ± 0.04 pg of DNA per diploid nucleus in Acestrorhynchus pantaneiro to 3.94 ± 0.09 pg in Tetragonopterus chalceus. A general analysis showed a mean value of 2.9 pg of DNA per diploid nucleus. Very similar DNA content values were observed in the species of the family Cynodontidae which showed a variation of 3% between the two genera studied. Small variations were observed between populations of Gymnocorymbus ternetzi,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nuclear DNA; DNA content; Chromosome; Fish; Evolution.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000100010

Intrachromosomal karyotype asymmetry in Orchidaceae
Provedor de dados: 74
Autores: Medeiros-Neto,Enoque; Nollet,Felipe; Moraes,Ana Paula; Felix,Leonardo P.
Abstract The asymmetry indexes have helped cytotaxonomists to interpret and classify plant karyotypes for species delimitation efforts. However, there is no consensus about the best method to calculate the intrachromosomal asymmetry. The present study aimed to compare different intrachromosomal asymmetry indexes in order to indicate which are more efficient for the estimation of asymmetry in different groups of orchids. Besides, we aimed to compare our results with the Orchidaceae phylogenetic proposal to test the hypothesis of Stebbins (1971). Through a literature review, karyotypes were selected and analyzed comparatively with ideal karyotypes in a cluster analysis. All karyotypes showed some level of interchromosomal asymmetry, ranging from slightly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Asymmetry index; Karyotype symmetry; Chromosome; Cytogenetic; Evolution.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000400610

Nuclear DNA content in 20 species of Siluriformes (Teleostei: Ostariophysi) from the Neotropical region
Provedor de dados: 74
Autores: Fenerich,Paulo César; Foresti,Fausto; Oliveira,Claudio.
In the present study, 20 species of Siluriformes fish were analyzed in order to determine their nuclear DNA content and compare these data with their diploid number. In addition, the extension and importance of the changes that occurred during the process of diversification in the group of Neotropical freshwater catfish were investigated. The only species studied of the family Doradidae, Rhinodoras d'orbignyi (2n = 58), presented 3.46 ± 0.13 pg of DNA. Among the species of the family Heptapteridae, the values of nuclear DNA content and the diploid numbers ranged from 1.13 ± 0.09 pg of DNA in Pimelodella sp. (2n = 46) to 2.38 ± 0.07 pg of DNA in Imparfinis mirini (2n = 58). The family Loricariidae showed the widest variation in diploid number and nuclear...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nuclear DNA; DNA content; Chromosome; Fish; Evolution.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572004000300008

Distinct nonrandom patterns of chromosomal deletions in giant-cell lesions of bone
Provedor de dados: 74
Autores: Baruffi,Marcelo Razera; Barbieri-Neto,J.; Pina-Neto,João Monteiro; Suerzut,C.E.; Casartelli,Cacilda.
Cytogenetic analyses were performed on a bone giant cell reparative granuloma (GCRG) and on three bone giant cell tumors (GCT). The present GCRG case is the second to be described cytogenetically. A modal chromosome number of 46 was observed in all samples. Clonal chromosome abnormalities were detected in all cases. The numerical alterations most frequently observed involved the loss of chromosomes 17 and 18. Among the structural anomalies observed, there was preferential involvement of chromosomes 6 and 10. Three GCT cases presented del(10)(p13) and two cases presented del(6)(q25) (1 GCRG and 1 GCT). These breakpoints mapped on 10p and 6q may harbour genes of importance in the development of bone giant cell tumors.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone; Giant-cell; Granuloma; Tumor; Chromosome.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000300002

Description of the karyotypes of Stejneger's beaked whale (Mesoplodon stejnegeri) and Hubbs’ beaked whale (M. carlhubbsi)
Provedor de dados: 74
Autores: Kurihara,Nozomi; Tajima,Yuko; Yamada,Tadasu K.; Matsuda,Ayaka; Matsuishi,Takashi.
Abstract The genus Mesoplodon (Cetacea: Odontoceti: Ziphiidae) is one of the few cetacean genera with the karyotype 2n = 42. The 2n = 42 karyotype of M. europaeus and M. carlhubbsi is largely consistent with the general cetacean karyotype 2n = 44, although other 2n = 42 karyotypes do not exhibit clear homologies with the general cetacean karyotype. Therefore, the chromosomes of Mesoplodon species may be the key to understanding cetacean karyological evolution. In the present study, the male karyotypes of M. stejnegeri and M. carlhubbsi were examined. In both species, the diploid number of the male karyotype was 42. Both species had the following characteristics: 1) a huge subtelocentric X chromosome with a large C-block; 2) a small metacentric Y...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype; Chromosome; Mesoplodon stejnegeri; Mesoplodon carlhubbsi.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000500803

The distribution of 45S rDNA sites in bird chromosomes suggests multiple evolutionary histories
Provedor de dados: 74
Autores: Degrandi,Tiago Marafiga; Gunski,Ricardo José; Garnero,Analía del Valle; Oliveira,Edivaldo Herculano Correa de; Kretschmer,Rafael; Souza,Marcelo Santos de; Barcellos,Suziane Alves; Hass,Iris.
Abstract The distribution of 45S rDNA cluster in avian karyotypes varies in different aspects, such as position, number of bearer chromosomes, and bearers being macro- or microchromosomes. The present study investigated the patterns of variation in the 45S rDNA-bearer chromosomes of birds in order to understand the evolutionary dynamics of the cluster configuration and its contribution to the evolution of bird karyotypes. A total of 73 bird species were analyzed, including both published data and species for which rDNA-FISH was conducted for the first time. In most birds, the 45S rDNA clusters were located in a single pair of microchromosomes. Hence, the location of 45S rDNA in macrochromosomes, observed only in Neognathae species, seems to be a derived...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: FISH; Chromosome; Chromosome evolution; Cytogenetics; Aves.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400601

Karyotype characterization, constitutive heterochromatin and nucleolus organizer regions of Paranaita opima (Coleoptera, Chrysomelidae, Alticinae)
Provedor de dados: 74
Autores: Almeida,Mara Cristina de; Campaner,Carlos; Cella,Doralice Maria.
Species of the subtribe Oedionychina not only have a highly uniform diploid number of 2n = 22 (20+X+y) but have the karyotypic peculiarity of possessing extremely large sex chromosomes. We analyzed Paranaita opima embryos and gonadal cells to determine their diploid number, chromosomal morphology, type of sex determination system, constitutive heterochromatin pattern and which chromosomes bear nucleolus organizer regions (NORs). The diploid number of P. opima was 2n = 22 (20+XY/XX) with all chromosomes being metacentric. Chromosome pair 6 showed an interstitial secondary constriction on the short arm. The C-banding technique revealed centromeric constitutive heterochromatin in all chromosomes, which, in pair 6, extended up to the secondary constriction of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: C bands; Chromosome; Embryos; Fluorochromes; NOR.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300013

Cytogenetics and sperm ultrastructure of Atelopus spumarius (Anura, Bufonidae) from the Brazilian Amazon
Provedor de dados: 74
Autores: Siqueira,Sérgio; Aguiar Junior,Odair; Lima,Albertina Pimentel; Recco-Pimentel,Shirlei Maria.
The current taxonomy of most Atelopus species is based on morphological and color data only. Recent studies suggest that A. spumarius may represent a species complex assigned under the same name. Karyotypic data and description of sperm ultrastructure for 13 specimens of A. spumarius are presented here for the first time. A chromosomal analysis revealed 2n = 22 chromosomes, with centromeric heterochromatin in all pairs and a nucleolar organizer region (NOR) on the telomere of pair 7. The sperm was of the bufonoid type, presenting a filiform nucleus covered by an acrosomal complex and a mitochondrial collar in the neck region. The tail was composed of an axoneme, an undulating membrane and an axial rod. A karyotype analysis of A. spumarius showed the same...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ag-NOR; Atelopus spumarius; C-band; Chromosome; Sperm ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000400011

Genotoxicity assessment of a pharmaceutical effluent using four bioassays
Provedor de dados: 74
Autores: Bakare,Adekunle A.; Okunola,Alabi A.; Adetunji,Olusanmi A.; Jenmi,Hafeez B.
Pharmaceutical industries are among the major contributors to industrial waste. Their effluents when wrongly handled and disposed of endanger both human and environmental health. In this study, we investigated the potential genotoxicity of a pharmaceutical effluent, by using the Allium cepa, mouse- sperm morphology, bone marrow chromosome aberration (CA) and micronucleus (MN) assays. Some of the physico-chemical properties of the effluent were also determined. The A. cepa and the animal assays were respectively carried out at concentrations of 0.5, 1, 2.5, 5 and 10%; and 1, 5, 10, 25 and 50% of the effluent. There was a statistically different (p &lt; 0.05), concentration-dependent inhibition of onion root growth and mitotic index, and induction of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Genotoxicity; Pharmaceutical effluent; Mouse; Allium cepa; Chromosome; Spermatozoa; Micronucleus.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200026

A new karyotype of Calomys (Rodentia, Sigmodontinae)
Provedor de dados: 76
Autores: Lima,J. Fernando de S.; Kasahara,Sanae.
The genus Calomys Waterhouse, 1837 is widely distributed within South America, being found in Venezuela, Colombia, Peru, Bolivia, Brazil, Paraguay, Uruguay and Argentina. Specimens of Calomys were collected in Formoso do Araguaia, Tocantins, Brazil. For chromosome characterization standard staining techniques and as G-banding and nucleolar organizer region were used. The karyotype was 2n=46 and AN=66. The X chromosome is a medium metacentric and the Y chromosome a small acrocentric chromosome. Chromosome homologies with other species were observed. Probably, karyotype differences were basically due to Robertsonian rearrangements.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calomys; Karyotype; Chromosome; Tocantins; Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212001000200019

Diferenças entre o Pseudocereal Chenopodium quinoa Wild. e a planta daninha Chenopodium album L., Chenopodiaceae.
Provedor de dados: 14
Autores: SPEHAR, C. R.; SANTOS, R. L. B.; NASSER, L. C. B.
bitstream/CPAC-2010/23956/1/comtec-61.pdf
Tipo: Comunicado Técnico (INFOTECA-E)
Palavras-chave: Caracteristica agronomica; Chromosome; Adaptability; Cultivar; Yield; Caracteristica; Planta invasora; Cultura: Quinoa.; Chenopodium Quinoa; Cerrado; Quinoa.; Chenopodium album; Dormancy; Weeds.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/564521

Karyotypic diversification in Mytilus mussels (Bivalvia: Mytilidae) inferred from chromosomal mapping of rRNA and histone gene clusters
Provedor de dados: 5
Autores: Perez Garcia, Maria Concepcion; Moran, Paloma; Pasantes, Juan J.
Background: Mussels of the genus Mytilus present morphologically similar karyotypes that are presumably conserved. The absence of chromosome painting probes in bivalves makes difficult verifying this hypothesis. In this context, we comparatively mapped ribosomal RNA and histone gene families on the chromosomes of Mytilus edulis, M. galloprovincialis, M. trossulus and M. californianus by fluorescent in situ hybridization (FISH). Results: Major rRNA, core and linker histone gene clusters mapped to different chromosome pairs in the four taxa. In contrast, minor rRNA gene clusters showed a different behavior. In all Mytilus two of the 5S rDNA clusters mapped to the same chromosome pair and one of them showed overlapping signals with those corresponding to one...
Tipo: Text
Palavras-chave: Mytilus; Chromosome; Fluorescent in situ hybridization; Histone genes; Ribosomal RNA genes; Fibre-FISH.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00204/31500/29906.pdf

Comparative karyological study of cupped oyster species
Provedor de dados: 5
Autores: Leitao, Alexandra; Boudry, Pierre; Labat, Jean-philippe; Thiriot-quievreux, Catherine.
Chromosomes of six cupped oyster species were studied using karyometric analysis alter conventional Giemsa staining, and silver staining, Karyotypes of Crassotrea angulata (nine metacentric and one submetacentric chromosome pairs), C. sikamea (nine metacentric and one submetacentric chromosome pairs), C. virginica (eight metacentric and two submetacentric chromosome pairs), C, ariakensis (eight metacentric and two submetacentric chromosome pairs), C, gasar (six metacentric and four submetacentric chromosome pairs), and Saccostrea commercialis (eight metacentric and two submetacentric chromosome pairs) are distinguishable by the number and position of the submetacentric chromosome pair and by the location of nucleolus organizer regions, Comparative...
Tipo: Text
Palavras-chave: Bivalvia; Cytotaxonomy; Karyotype; Chromosome; Cupped oyster.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-2737.pdf

Chromosome loss in bi-parental progenies of tetraploid Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Mccombie, Helen; Lapegue, Sylvie; Cornette, Florence; Ledu, Christophe; Boudry, Pierre.
Alterations of chromosome number have been observed in the somatic tissue of Crassostrea gigas diploids and artificial polyploids. Tetraploid oysters with abnormal chromosome numbers in some or all of their tissue are considered undesirable as parents either for triploids (produced via a cross with diploids and of aquacultural interest) or for tetraploid breeding. Aneuploid tetraploid oysters may confer the tendency to lose chromosomes and to revert to lower ploidy levels to their offspring. More directly, their offspring could have a lower ploidy because of potential links between somatic and gametic chromosome loss. The present study evaluated the phenomenon in six bi-parental tetraploid families bred from parents of differing somatic ploidy quality. The...
Tipo: Text
Palavras-chave: Crassostrea gigas; Mitosis; Chromosome; Cytogenetics; Aneuploid; Polyptoid; Tetraploid; Oyster.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-633.pdf

Fluorescence in situ hybridization (FISH) or rDNA genes (5S and 18-5.8-28S) as a tool for chromosomal tagging and to assess the occurrence of somatic and sperm aneuploidy in Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Benabdelmouna, Abdellah; Nadolna, Katarzyna; Ledu, Christophe.
Aneuploidy (or alteration of chromosome number) has been frequently described in diploid, triploid and tetraploid C. gigas. In diploid Pacific oysters, aneuploidy affects 1 to 3 chromosomes in up to 35% of the somatic cells and is positively correlated with inferior growth of the animal and thus could be associated with significant economic loss in this major aquaculture species. In polyploid Pacific oysters, aneuploidy was shown to be more heavily frequent and is linked to reversion to lower ploidy levels and is at the origin of aberrant gametes formation. In this context, identification of individual chromosomes involved in aneuploidy events both in somatic and germinal cells would be an important step towards the study of the exact occurrence of this...
Tipo: Text
Palavras-chave: Chromosome; Aneuploidy; Genetic; Crassostrea gigas; Pacific oysters.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/acte-3502.pdf

Chromosome loss in tetraploid families of the Pacific oyster Crassostrea gigas
Provedor de dados: 5
Autores: Mccombie, Helen; Lapegue, Sylvie; Cornette, Florence; Ledu, Christophe; Boudry, Pierre.
Alterations of  chromosome number have been observed in the somatic tissue of  Crassostrea gigas diploids and artificial polyploids bred in this species.   Tetraploid animals with lower chromosome counts in some or all of their somatic tissue are considered undesirable as parents either for commercial triploids (produced via a  cross with diploids) or for tetraploid breeding because (1) they may confer the tendency to lose chromosomes and revert to lower ploidy levels to their offspring or (2) their offspring could have a lower ploidy directly because of potential links between somatic and gametic chromosome loss.  The present study evaluated the phenomenon in bi-parental tetraploid families bred from parents of differing ploidy quality, including a...
Tipo: Text
Palavras-chave: Tetraploid; Chromosome; Genetic; Crassostrea gigas; Oyster.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-3435.pdf

A "G" chromosome banding study of three cupped oyster species : Crassostrea gigas, Crassostrea angulata and Crassostrea virginica (Mollusca : Bivalvia)
Provedor de dados: 5
Autores: Leitao, Alexandra; Thiriot-quievreux, Catherine; Malheiro, Isabel; Boudry, Pierre.
The G-banding technique was performed on chromosomes from gill tissue of three cupped oyster species : Crassostrea gigas, Crassostrea angulata and Crassostrea virginica. Identification of the ten individual chromosome pairs was obtained. Comparative analysis of G-banded karyotypes of the three species showed that their banding patterns generally resembled each other, with chromosome pair 3 being similar in all three species. However, differences from one species to another were also observed. The G-banding pattern highlighted greater similarities between C. gigas and C. angulata than between these two species and C. virginica, thus providing an additional argument for genetic divergence between, these two evolutionary lineages. C. gigas and C. angulata...
Tipo: Text
Palavras-chave: Crassostrea virginica; Crassostrea angulata; Crassostrea gigas; G banding; Chromosome.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-2736.pdf

Ronderosia ommexechoides: a new species of Brazilian Dichroplini (Orthoptera: Acrididae, Melanoplinae)
Provedor de dados: 82
Autores: Carbonell,Carlos S.; Mesa,Alejo.
A new species of the genus Ronderosia Cigliano 1997 is described. Color illustrations of the female and male, drawings of female and male external genitalia as well as drawings of its phallic structures and photographs of the chromosomes are included.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neotropical grasshopper; New taxon; Caelifera; Chromosome.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000500010

Adelosgryllus rubricephalus: a new genus and species of cricket (Orthoptera: Phalangopsidae)
Provedor de dados: 82
Autores: Mesa,Alejo; Zefa,Edison.
Adelosgryllus rubricephalus, a new genus and species of phalangopsid cricket are described. Illustrations of male and female specimens as well as descriptions of phallic sclerites, chromosomes and geographical known distribution are furnished. A discussion on the species taxonomic status of this cricket within the family is also included.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grylloidea; Morphology; Phallic sclerite; Chromosome.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000300008

Karyotype, heterochromatin distribution and meiosis of Zabrotes subfasciatus (Bohemann) (Coleoptera: Chrysomelidae, Bruchinae)
Provedor de dados: 82
Autores: Corrêa,Ronan X.; Pompolo,Sílvia G.; Santos,Igor S.; Silva,Janisete G.; Costa,Marco A.
Zabrotes subfasciatus (Boh.) has been extensively studied in its agronomic and biochemical aspects due to its importance as a damaging insect to leguminous grains during storage. The few cytogenetic studies published on this species yielded conflicting results. In this study, the karyotype was analyzed in order to accurately describe the chromosome C-banding patterns and meiosis. The brain ganglion at the prepupa and the adult and pupal testes were analyzed. All individuals had 26 chromosomes in both brain ganglion and spermatogonic mitotic metaphases. These chromosomes were classified as follows: the 12th pair and the Y chromosome were telocentric; the X chromosome was acrocentric; the 4th and 5th pairs were submetacentric; and the remaining pairs were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insecta; Mexican bean weevil; Chromosome; C-banding; Xyp system.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000500007

Cytogenetics studies in thirteen Brazilian species of Phaneropterinae (Orthoptera: Tettigonioidea: Tettigoniidae): main evolutive trends based on their karyological traits
Provedor de dados: 82
Autores: Ferreira,Amilton; Mesa,Alejo.
The thirteen species of Phaneropterinae here studied can be arranged in four different groups according to their basic karyological traits. All of them share the same kind of chromosomal sex determining mechanism with X0(male) and XX(female). The X chromosome differs among species and always appears heteropycnotic during prophase I, it is the largest in the set and segregates precociously during anaphase I. Among the species, the karyotypes varies in fundamental number between 31 to 21. The meaning of these significant changes in the karyotypes in relation to the phylogeny within some large taxonomic group of species is discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Karyotype; Chromosome; Evolution.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000400003

Conserved number of U2 snDNA sites in Piabina argentea, Piabarchus stramineus and two Bryconamericus species (Characidae, Stevardiinae)
Provedor de dados: 83
Autores: Piscor,Diovani; Fernandes,Carlos Alexandre; Parise-Maltempi,Patricia P.
ABSTRACT The chromosomal location of 5S rRNA and U2 snRNA genes of Piabina argentea, Piabarchus stramineus and two Bryconamericus species from two different Brazilian river basins were investigated, in order to contribute to the understanding of evolutionary characteristics of these repetitive DNAs in the subfamily Stevardiinae. The diploid chromosome number was 2n = 52 for Bryconamericus cf. iheringii, Bryconamericus turiuba, Piabarchus stramineus and Piabina argentea. The 5S rDNA clusters were located on one chromosome pair in P. stramineus and B. cf. iheringii, and on two pairs in B. turiuba and P. argentea. The U2 snDNA clusters were located on the one pair in all species. Two-color FISH experiments showed that the co-localization between 5S rDNA and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Repetitive DNA; Splicing; 5S rDNA; Chromosome; Diploid number.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100207

BABESIA CABALLI : ANALYSIS OF CHROMOSOMES SEPARATED BY PULSE FIELD GEL ELECTROPHORESIS
Provedor de dados: 19
Autores: Ikadai, Hiromi; Kudo, Noboru; Oyamada, Takashi; Igarashi, Ikuo; 五十嵐, 郁男.
Palavras-chave: Babesia caballi; Pulsed field gel electrophoresis; Chromosome; Rhoptry gene.
Ano: 2004
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/642

Morphological characterization under different ecological habitats and physical mapping of 5S and 45S rDNA in Lilium distichum with fluorescence in situ hybridization
Provedor de dados: 97
Autores: Hwang,Yoon-Jung; Song,Chang-Min; Younis,Adnan; Kim,Chang-Kil; Kang,Yoon-Im; Lim,Ki-Byung.
BACKGROUND: This study was performed to investigate the phenotypic, karyomorphological, and habitat environment characteristics of Lilium distichum that grows naturally in South Korea. Currently, this species follows limited distribution areas and its natural populations are at the brink of extinction mainly due to fragmentation or destruction its natural habitat. RESULTS: This species was distributed between approximately 1,000 and 1,500 m above sea level with an average temperature of 22°C. The soil characteristics surrounding the natural habitats included loamy and silt loam soils having organic matter content (10.82%), pH (5.22), electrical conductivity (EC) (0.37 dS/m), total nitrogen (0.45%), and cation exchange capacity (34.3 cmol+/kg). The peak...
Tipo: Journal article
Palavras-chave: Chromosome; Karyotype; Habitat; Korea; 5S rDNA; 45S rDNA.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2015000100008

Karyotype of the gall fly Tomoplagia rudolphi (Lutz &amp;amp; Lima) (Diptera, Tephritidae)
Provedor de dados: 104
Autores: Carneiro,Marco Antônio A.; Gomes,Luiz Fernando; Pompolo,Silvia das Graças; Campos,Lucio Antonio de Oliveira.
The objective of the present study is to describe the karyotype of the fruit fly Tomoplagia rudolphi (Lutz &amp;amp; Lima, 1918). This fly induces the formation of galls on the stems of Vernonia polianthes (Asteraceae). The cytogenetic analysis of cerebral ganglia (larva and pupa) and testis (adults) of T. rudolphi showed a diploid chromosome number of 2n = 10 + xx (female) and 2n = 10 + xy (male). The diploid chromosome number 2n = 12 and the XX/XY sex determination system have been found in most of the species studied. The present investigation constitutes the first cytogenetics study of the genus Tomoplagia Coquilltt, 1910.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Cyclorrhapha; Cytogenetic; Fruit fly; Sex determination.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000600021

Cytogenetic analysis of Cycloramphus boraceiensis Heyer (Anura, Leptodactylidae)
Provedor de dados: 104
Autores: Silva,Ana Paula Zampieri; Haddad,Célio F.B.; Kasahara,Sanae.
Cytogenetic studies on Cycloramphus boraceiensis Heyer, 1983 collected in Picinguaba, Ubatuba, State of São Paulo are presented. The species has 2n=26 karyotype formed by metacentrics, submetacentrics, and one telocentric pair which carries Ag-NORs. The C-banding patterns is also described.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anura; Cycloramphus; Chromosome; Cytogenetics.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000100011

Cytogenetic and molecular characterization of Speothos venaticus specimens - doi: 10.4025/actascibiolsci.v32i4.6775
Provedor de dados: 3
Autores: Carvalho, Thaís Lima; UNESP - IBB; Curi, Rogério Abdallah; UNESP - FMVZ; Santiloni, Valquíria; UNESP - IBB; Chieregatto, Cleyde Angélica Ferreira da Silva; Sociedade dos Zoológicos do Brasil; Rocha, Guaracy Tadeu; UNESP - IBB; Mota, Lígia Souza Lima Silveira da; UNESP - IBB.
The bush dog (Speothos venaticus) is a South American canid, included in the IBAMA (Brazilian Institute of Environment and Renewable Natural Resources) official list of animals threatened with extinction, in the vulnerable category. As a preservation and conservation strategy, specimens kept in captivity by Brazilian Institutions are monitored by a management plan. In order to characterize and analyze the genetic variability of bush dog specimens, a cytogenetic analysis was carried out, and microsatellite data were also obtained through the use of 15 primers, originally developed for the domestic dog (Canis familiaris). All tested primers showed transferability and amplified fragment sizes similar to those described for the canine genome. From the total...
Palavras-chave: 2.02.04.00-0 bush dog; Canids; Chromosome; Microsatellite; Mosaicism Genética Animal bush dog; Canids; Chromosome; Microsatellite; Mosaicism.
Ano: 2010
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/6775

Polytypic and polymorphic cytogenetic variations in the widespread anuran Physalaemus cuvieri (Anura, Leiuperidae) with emphasis on nucleolar organizing regions
Provedor de dados: 48
Autores: QUINDERÉ,YEDA R. S. D; LOURENÇO,LUCIANA B; ANDRADE,GILDA V; TOMATIS,CRISTIAN; BALDO,DIEGO; RECCO-PIMENTEL,SHIRLEI M.
We investigated the NOR distribution in ten populations of Physalaemus cuvieri from different regions of Brazil and Argentina. A high variability in NOR pattern was observed and provided a useful tool in grouping several populations. The specimens from the state of Tocantins, northern Brazil, could easily be distinguished from all the other analyzed populations, since its karyotype presented NORs in the chromosome pairs 1,3,4 and 10 (and sometimes also in chromosome 5), and several pericentromeric C-bands. A NOR-site in chromosome 9 characterized three populations from the northeastern region of Brazil. Interestingly, the P. cuvieri populations located in opposite extremes of the geographic distribution had, as a fixed condition, the presence of NORs in 8q...
Tipo: Journal article
Palavras-chave: Anura; Chromosome; Cytogenetics; NOR; Physalaemus; Polymorphic variations; Polytypic variations.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000100008

Cytogenetic characterization of Aloysia virgata Ruiz and Pavan (Verbenaceae)
Provedor de dados: 52
Autores: Brandão,Aline Dias; Viccini,Lyderson Facio; Recco-Pimentel,Shirlei Maria.
Since previous cytogenetic reports of Aloysia have only described the meiotic behavior and chromosomal number of some species, the aim of this work was to provide detailed cytogenetic description of Aloysia virgata that would contribute to the understanding of the taxonomical organization of the Verbenaceae. Aloysia virgata had a karyotype with 2n = 36 metacentric chromosomes, all with similar size. The large amount of heterochromatin seen after Giemsa staining was confirmed by C-banding. Four nucleolar organizer regions (NORs) were detected with an rDNA 45S probe in two homologous pairs and two sites of 5S rDNA located on one chromosomal pair were detected by fluorescence in situ hybridization. The interphase nucleus was classified as semi-reticulate....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Cytogenetic characterization; FISH; Aloysia; Verbenaceae.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400013

Chromosome analysis in cattle and horses
Provedor de dados: 62
Autores: AMARANTE,Mônica Regina Vendrame; TSURIBE,Patrícia Miyuki; JORGE,Wilham; ROCHA,Gilberto Pedroso da.
We analyzed the chromosomes of 117 cows of different breeds for the identification of centric fusion and the chromosomes of 100 young Andaluz and Brasileiro de Hipismo mares for the identification of 63,X lines, using the technique of X chromosome identification based on interstitial heterochromatin on the long arm.
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Cattle; Horse; Chromosome.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962000000400006

Unexpected chromosomal alterations in Tayassu tajacu (Artiodactyla: Tayassuidae) in captivity
Provedor de dados: 62
Autores: Lima,José Fernando de Sousa; Guedes,Fátima Becker; Silva,Roxane Wirschum; Hass,Iris; Cavalli,Iglenir João; Silva,Juliana da; Freitas,Thales Renato de; Sbalqueiro,Ives José.
Wild animals have been used as bioindicators in situations in which the environment was exposed to chemical agents. In general, chemical agents may induce chromosomal aberrations, such as breaks and gaps. The peccary, Tayassu tajacu is a pig relative that exhibits a very stable karyotype with the only described alterations being of the form of the X chromosome. Chromosomal gaps and breaks were observed at high frequencies during cytogenetics analyses. These alterations were observed in the chromosomes autossomics. Reviews of the literature and of the data described herein suggests that an vermifuge, the ivermectin base, was the most likely cause of these chromosomal alterations.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tayassu; Karyotype; Chromosome; Chromosomal alterations.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962004000100002

Chromosome studies in some Stevia. Cav. (Compositae) species from Southern Brazil
Provedor de dados: 54
Autores: Frederico,Adriana P.; Ruas,Paulo M.; Marin-Morales,Maria A.; Ruas,Claudete F.; Nakajima,Jimi N.
Karyotypes of six species of the genus Stevia from Southern Brazil were studied, utilizing root tip metaphases. All species were diploid with 2n = 22 chromosomes. It was possible to identify each species by chromosome morphology. The basic chromosome number for Brazilian species of Stevia is X = 11. This number is also found in almost all South American species. We suggest that in Stevia there is an evolutionary trend toward chromosomal rearrangement, caused mainly by pericentric inversions. It was found that, in addition to aneuploidy and polyploidy, chromosomal rearrangements are common in the tribe Eupatorieae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Stevia. Cav.; Southern Brazil.
Ano: 1996
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84551996000400013

Cytokine expression patterns and mesenchymal stem cell karyotypes from the bone marrow microenvironment of patients with myelodysplastic syndromes
Provedor de dados: 56
Autores: Xiong,H.; Yang,X.Y.; Han,J.; Wang,Q.; Zou,Z.L.
The purpose of this study was to explore cytokine expression patterns and cytogenetic abnormalities of mesenchymal stem cells (MSCs) from the bone marrow microenvironment of Chinese patients with myelodysplastic syndromes (MDS). Bone marrow samples were obtained from 30 cases of MDS (MDS group) and 30 healthy donors (control group). The expression pattern of cytokines was detected by customized protein array. The karyotypes of MSCs were analyzed using fluorescence in situ hybridization. Compared with the control group, leukemia inhibitory factor, stem cell factor (SCF), stromal cell-derived factor (SDF-1), bone morphogenetic protein 4, hematopoietic stem cell (HSC) stimulating factor, and transforming growth factor-β in the MDS group were significantly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone marrow microenvironment; Cytokine; Mesenchymal stem cell; Chromosome; Pathogenesis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000300207

Cytogenetic analyses in Paspalum L. reveal new diploid species and accessions
Provedor de dados: 65
Autores: Pozzobon,Marisa Toniolo; Machado,Ana Caroline de Carvalho; Vaio,Magdalena; Valls,José Francisco Montenegro; Peñaloza,Andréa del Pilar de Souza; Santos,Sileuza dos; Côrtes,Ana Luiza; Rua,Gabriel Hugo.
Chromosome numbers were counted in 126 new accessions of 50 Paspalum species from Brazil, Argentina, Paraguay and Bolivia. The chromosome numbers 2n=12, 20, 24, 30, 40, 50, 60, 80 were confirmed. Chromosome numbers for P. arenarium (2n=20), P. barretoi (2n=20), P. aff. ceresia (2n=40), P. corcovadense (2n=20), P. crispulum (2n=20), P. flaccidum (2n=40), P. nummularium (2n=20), P. scalare (2n=20), P. vescum (2n=20) and P. rectum (2n=20) and a diploid cytotype of P. malacophyllum are reported for the first time. The predominance of tetraploid accessions (43.6%) was confirmed, but an unusually high number of diploid species (44%) and accessions (35.7%) was found. These results open new perspectives for breeding programs, phylogenetic studies, and for research...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromosome; Diploid; Polyploid; Ploidy level; Hybrid; Genetic resources.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782008000500014

Cytogenetics of Pennisetum purpureum Schumack x Pennisetum glaucum L. hybrids and their parents
Provedor de dados: 64
Autores: Barbosa,Sandro; Davide,Lisete Chamma; Pereira,Antônio Vander.
Cytogenetic studies were carried out on five accesses of interspecific hybrids of Pennisetum purpureum and Pennisetum glaucum and their parentals, which are part of the Forage Germplasm Bank of the "Centro Nacional de Pesquisa de Gado de Leite" of EMBRAPA, Brazil. The mitotic cytogenetic analysis, performed using stain by Schiff reactive, confirmed the chromosome number of 2n = 14, 28 and 21 for the accesses of P. glaucum, P. purpureum and their hybrids, respectively. For each access, descriptions of the chromosome complement and idiograms are presented which allowed to establish the karyotypic relationships between the hybrids and their parentals. Based on the total chromosomal length data it was possible to establish the karyotype classification of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Elephant grass; Pearl millet; Interspecific hybrids; Cytogenetic; Ideograms; Chromosome.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542003000100003