Avaliação do potencial profilático de células dendríticas transfectadas com RNA fúngico em modelo experimental de esporotricose sistêmica

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Mapeamento físico de genes ribosomais 18S e 5S nos cromossomos de espécies simpáticas do gênero Gymnotus (Teleostei, Gymnotiformes, Gymnotidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudos citogenéticos em populações de Bryconamericus stramines, Eigenmann, 1908(Teleostei, Characidae) em rios das bacias do Tietê e Paranapanema

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Filogenia e biogeografia de Droseraceae inferidas a partir de caracteres morfológicos e moleculares (18S, atpB, matK, rbcL e ITS)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Dinâmica evolutiva de DNAs repetitivos com ênfase em espécies da tribo Phanaeini

Pós-graduação em Ciências Biológicas (Genética) - IBB

Relacionamento filogenético de espécies pertencentes às famílias Coreidae e Pentatomidae (Heteroptera) a partir dos genes mitocondriais COI, 16S e nuclear 18S

Pós-graduação em Genética - IBILCE

Characterization of 23S rRNA domain V mutations in gastric biopsy patients from the eastern Amazon

Resistance of Helicobacter pylori to clarithromycin is characterised by simple point mutations in the 23S ribosomal RNA (rRNA) gene and is responsible for the majority of cases of failure to eradicate this bacterium. In this paper, we characterised the variability of the 23S rRNA gene in biopsies of patients with gastric pathologies in the eastern Amazon (Northern Region of Brazil) using PCR and sequencing. A total of 49 sequences of H. pylori strains were analysed and of those, 75.6% presented nucleotide substitutions: A2142G (3.3%), T2182C (12.9%), G2224A (6.45%), T2215C (61.3%), A2192G (3.3%), G2204C (6.4%) and T2221C (6.4%). Of the mutations identified, four are known mutations related to cases of resistance and 16.1% are not yet described, revealing a high prevalence of mutations in the H. pylori 23S rRNA gene among the strains circulating in the in the eastern Amazon. The high prevalence in individuals with gastric pathologies in the Northern Region of Brazil demonstrates the need for characterising the profile of these strains to provide correct therapy for patients, considering that mutations in this gene are normally associated with resistance to the primary medication used in controlling H. pylori infection.

Otimização da autólise de Saccharomyces cerevisiae de cervejaria e extração de RNA

Pós-graduação em Ciências Biológicas (Microbiologia Aplicada) - IBRC

Baixas Doses de 5-fluorouracil aumentam a atividade antitumoral de células dendríticas transfectadas com RNA de células de câncer colorretal

Pós-graduação em Patologia - FMB

Phylogenetic study of Class Armophorea (Alveolata, Ciliophora) based on 18S-rDNA data

The 18S rDNA phylogeny of Class Armophorea, a group of anaerobic ciliates, is proposed based on an analysis of 44 sequences (out of 195) retrieved from the NCBI/GenBank database. Emphasis was placed on the use of two nucleotide alignment criteria that involved variation in the gap-opening and gap-extension parameters and the use of rRNA secondary structure to orientate multiple-alignment. A sensitivity analysis of 76 data sets was run to assess the effect of variations in indel parameters on tree topologies. Bayesian inference, maximum likelihood and maximum parsimony phylogenetic analyses were used to explore how different analytic frameworks influenced the resulting hypotheses. A sensitivity analysis revealed that the relationships among higher taxa of the Intramacronucleata were dependent upon how indels were determined during multiple-alignment of nucleotides. The phylogenetic analyses rejected the monophyly of the Armophorea most of the time and consistently indicated that the Metopidae and Nyctotheridae were related to the Litostomatea. There was no consensus on the placement of the Caenomorphidae, which could be a sister group of the Metopidae + Nyctorheridae, or could have diverged at the base of the Spirotrichea branch or the Intramacronucleata tree.

Chromosomal diversity in three species of electric fish (Apteronotidae, Gymnotiformes) from the Amazon Basin

Cytogenetic studies were carried out on samples of Parapteronotus hasemani, Sternarchogiton preto and Sternarchorhamphus muelleri (Apteronotidae, Gymnotiformes) from the Amazon basin. The first two species exhibited both a 2n = 52 karyotype, but differed in their karyotypic formulae, distribution of constitutive heterochromatin, and chromosomal location of the NOR. The third species, Sternarchorhamphus muelleri, was found to have a 2n = 32 karyotype. In all three species the DAPI and chromomycin A3 staining results were consistent with the C-banding results and nucleolar organizer region (NOR) localization. The 18S rDNA probe confirmed that there was only one pair of ribosomal DNA cistron bearers per species. The telomeric probe did not reveal interstitial telomeric sequences (ITS). The karyotypic differences among these species can be used for taxonomic identification. These data will be useful in future studies of these fishes and help understanding the phylogenetic relationships and chromosomal evolution of the Apteronotidae.

A comparison of molecular markers to detect Lutzomyia longipalpis naturally infected with Leishmania (Leishmania) infantum

The aim of the present study was to detect natural infection by Leishmania (Leishmania) infantum in Lutzomyia longipalpis captured in Barcarena, state of Pará, Brazil, through the use of three primer sets. With this approach, it is unnecessary to previously dissect the sandfly specimens. DNA of 280 Lu. longipalpis female specimens were extracted from the whole insects. PCR primers for kinetoplast minicircle DNA (kDNA), the mini-exon gene and the small subunit ribosomal RNA (SSU-rRNA) gene of Leishmania were used, generating fragments of 400 bp, 780 bp and 603 bp, respectively. Infection by the parasite was found with the kDNA primer in 8.6% of the cases, with the mini-exon gene primer in 7.1% of the cases and with the SSU-rRNA gene primer in 5.3% of the cases. These data show the importance of polymerase chain reaction as a tool for investigating the molecular epidemiology of visceral leishmaniasis by estimating the risk of disease transmission in endemic areas, with the kDNA primer representing the most reliable marker for the parasite.

Origem, herança e estrutura dos cromossomos supranumerários no gênero Prochilodus (Characiformes, Prochilodontidae)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Origens dos cromossomos B em espécies de Characidium (Characiformes, Crenuchidae) baseada em pintura cromossômica, sequências de rDNA e histonas

Pós-graduação em Ciências Biológicas (Genética) - IBB

Caracterização citogenética e molecular das espécies Cichla kelberi e Cichla piquiti e seu possível híbrido interespecífico coletados em ambientes naturais

Pós-graduação em Ciências Biológicas (Zoologia) - IBB