Research Article

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10/06/2009
Angiomatoid features; Cancer; Cytogenetics; Epithelioid sarcoma

Epithelioid sarcoma is a rare, aggressive soft tissue tumor of unknown histogenesis showing predominantly epithelioid cytomorphology. We conducted a conventional and molecular cytogenetic study of a 27-year-old male with epithelioid sarcoma with angiomatoid features. Cytogenetic analysis of epithelioid sarcoma metaphase spreads by GTG-banding revealed a diploid chromosome complement with ... more

M.S. Brassesco; E.T. Valera; A.M. Castro-Gamero; D.A. Moreno; T.P. Silveira; B.M. Mori; E.E. Engel; C.A. Scrideli; L.G. Tone
08/10/2010
Cancer biology; Cytogenetics; Tumor biology; Wilms tumor

Genetic instability is frequent in human cancer. Unscheduled tetraploidization can trigger cell transformation and tumorigenesis. We made a cytogenetic analysis by Giemsa-trypsin banding of a stage I, biphasic Wilms tumor diagnosed in a 10-month-old male. An evident karyotypic heterogeneity was found. Four different subclones of tumor cells were observed, with DNA content varying from diploid ... more

E.T. Valera; M.S. Brassesco; C.A. Scrideli; L.G. Tone
06/15/2012
Cytogenetics; del(13q); i(6p); Retinoblastoma

We describe a case of retinoblastoma with an atypical presentation and previously unreported cytogenetic aberrations. A 19-month-old girl with left intraocular retinoblastoma was treated with enucleation and chemotherapy. The disease showed aggressive evolution within a short period between diagnosis and relapse. Eight months after diagnosis, a new large tumor was present in the orbit of the ... more

J.E.X.S. Barros; E.M. Soares-Ventura; N. Santos; B.A.S. Amaral; F.M. Oliveira; R.S.Vera Cruz; V.L.L. Morais; T.J. Marques-Salles; M.T.C. Muniz
09/22/2015
Cytogenetics; Meiosis; Plant breeding; Pollen viability; X Triticosecale Wittmack

Triticale (X Triticosecale Wittmack) is an intergeneric hybrid derived from a cross between wheat and rye. As a newly created allopolyploid, the plant shows instabilities during the meiotic process, which may result in the loss of fertility. This genomic instability has hindered the success of triticale-breeding programs. Therefore, strategies should be developed to obtain stable ... more

R.M. Giacomin; R. Assis; S.P. Brammer; N. Junior; P.R. Da-Silva
12/29/2015
Breast cancer; Canine; Chromosome alterations; Cytogenetics; Neoplasm

Currently, mammary neoplasms in female canines are a serious problem in veterinary clinics. In addition, the canine species is an excellent disease model for human oncology because of the biological and genetic similarities between the species. Cytogenetics has allowed further study of the characterization of neoplasms in canines. We hypothesized that the use of a direct preparation ... more

C.S.D. Morais; P.R.A.M. Affonso; J.A. Bitencourt; A.A. Wenceslau
03/31/2016
Chromosomal homogeneity; Cytogenetics; Triatominae subfamily

Triatoma maculata and T. pseudomaculata are allopatric; however, it is believed that T. maculata was introduced into the Brazilian northeast by passive transportation of the nymphs between the feathers of migratory birds, followed by the speciation of T. pseudomaculata. T. pseudomaculata is the second most epidemiologically important species in ... more

C.H.L. Imperador; K.C.C. Alevi; J. Oliveira; J.A. Rosa; M.T.V. Azeredo-Oliveira; C.H.L. Imperador; K.C.C. Alevi; J. Oliveira; J.A. Rosa; M.T.V. Azeredo-Oliveira; C.H.L. Imperador; K.C.C. Alevi; J. Oliveira; J.A. Rosa; M.T.V. Azeredo-Oliveira
03/28/2016
Cytogenetics; Meiosis; Nucleolus

The Triatominae subfamily consists of 150 species in 18 genera, grouped into six tribes. In cytogenetics, triatomines are important biological models because they have holocentric chromosomes and nucleolar persistence in meiosis. The phenomenon of nucleolar persistence has been described for 23 species of triatomine in three genera: Triatoma, Rhodnius, and ... more

F.F. Madeira; A.A.C. Lima; J.A. Rosa; M.T.V. Azeredo-Oliveira; K.C.C. Alevi; F.F. Madeira; A.A.C. Lima; J.A. Rosa; M.T.V. Azeredo-Oliveira; K.C.C. Alevi; F.F. Madeira; A.A.C. Lima; J.A. Rosa; M.T.V. Azeredo-Oliveira; K.C.C. Alevi
04/28/2016
Coreoidea; Cytogenetics; Holocentric chromosomes

In Heteroptera, the division of sex chromosomes is well defined as post-reductional for most of species, i.e., the first meiotic division is equational and the second is reductional. However, in some species pre-reductional division has been observed, whereby the first meiotic division is reductional and the second is equational. These include Anisops fieberi (Notonectidae), ... more

C.A. Banho; K.C.C. Alevi; L.L.V. Pereira; T.S. Souza-Firmino; M.M. Itoyama; C.A. Banho; K.C.C. Alevi; L.L.V. Pereira; T.S. Souza-Firmino; M.M. Itoyama; C.A. Banho; K.C.C. Alevi; L.L.V. Pereira; T.S. Souza-Firmino; M.M. Itoyama
08/19/2016
Cytogenetics; Flavida complex; Nesotriatoma

The Nesotriatoma genus consists of the species N. flavida N. bruneri and N. obscura, forming the Flavida complex. Variation in the size and morphological differences intraspecific of N. flavida led to the description of N. bruneri. Two years later, the same author proposed the synonymization of N. bruneri with N. flavida. Only ... more

Y.V. Reis; K.C.C. Alevi; F.F.F. Moreira; M.T.V. Azeredo-Oliveira; Y.V. Reis; K.C.C. Alevi; F.F.F. Moreira; M.T.V. Azeredo-Oliveira
09/27/2017
Cytogenetics; Magnoliopsida; Meiosis; Plant breeding; Pollen; Recombination, Genetic

The analysis of meiotic behavior has been widely used in the study of plants as they provide relevant information about the viability of a species. Meiosis boasts a host of highly conserved events and changes in genes that control these events will give rise to irregularities that can alter the normal course of meiosis and may lead to complete sterility of the plant. The recombination of genes ... more

M.P. Lavinscky; M.M. Souza; G.S. Silva; C.A.F. Melo

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