Programa de Pós-graduação em Ciências Biológicas

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Navegando Programa de Pós-graduação em Ciências Biológicas por Por Orientador "Cruz, Aparecido Divino da"

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    Análise epidemiológica, molecular e citogenética do câncer de hipofaringe em Goiânia
    (Universidade Federal de Goiás, 2006-09-29) Costa, Cesar Augusto Sam Tiago Vilanova; Cruz, Aparecido Divino da; http://lattes.cnpq.br/7868817504129985
    Hypo pharynx is the under region of pharynx and serves both respiratory and digestive tract, acting as a passageway to air and food. It’s composed by squamous nonkeratinized epithelial tissue. Statistical studies indicates that 85 to 90% of neoplasies rush pyriform sinus and are characterized by fast dissemination and metastization. Epidemiological trends of hypo pharynx cancer in Goiania on period 1998 to 2003 analyzing data derived from Cancer Registry of Association for Cancer Combat of Goias, shows that the relative survival rate for men diagnosed with hypo pharynx cancer was 38% past 60 months while women presented a survival rate of 100%. Surgery was the treatments that present fewer rates (34%) and chemotherapy was associated to the most survival rate (54%). Patients that use tobacco presented a survival rate of 43% while non-tabagists present a rate of 60% of surviving. Relative survival rate for patients diagnosed with hypo pharynx tumor was 38% and estimated censure for 5 years was just 5%. Survival rate was extremely decreased due to 45% of cases were diagnosed in advanced stages of disease. It is important to point out that preventive campaign is important to evade the increasing of these pathologies that are related to behavior of tabagism and etilism. Present study also evaluates cytogenetically individuals diagnosed with hypo pharynx cancer. Cytogenetic analysis of exfoliated cells is largely used to evaluate cytotoxic and genotoxic alterations on people exposed to potentially mutagens. A number of 36 individuals were analyzed, representing case group, and 36 healthy individuals composed control group. Data was collected and analysis was performed to estimate main nuclear alterations. Standard protocols were adopted to collect and counting cells. Micronuclei test was used to determinate the frequency of cytotoxic and genotoxic alterations. Besides than micronuclei others alterations like broken-eggs, binucleated cells and piknotic nuclei are good markers of cell alterations because they are resulted from cytotoxic events frequently related to occupational exposure. Behaviors like tabagism, etilism and exposition time were also investigated to correlate cells alterations. The correlation between micronuclei frequencies of case and control group test doesn’t show statistic difference. Broken egg and binucleated cells were the most observed anomalies on case group and showed up significant statistic difference (p=0.03). Results indicates a high grade of cytotoxic anomalies on individuals with hypo pharynx cancer, specially in tabagists and chronic etilists individuals, behaviors that are correlated to induct and promote tumors in susceptible people due their capabilities to affect cell cycle. Studies about relationship between Human Papillomavirus (HPV) and cancer development are performed since 80’s. Although the correlation of HPV and cervical cancer are well established, the possible role of HPV and head and neck cancer are still unclear. Among controversial factors of HPV and carcinogenesis of squamous epithelial cells, there is a viral incidence that oscillates from 0 to almost 100% on studies that includes a myriad of viral genome detect methods, such Blotting and PCR. Importance of HPV infection and epithelial carcinogenesis is related to capabilities of High risk HPV 16 and 18 to promote cell alterations, by tumor suppressor proteins inactivation, tumor suppressor genes blockage and insertions of HPV oncogenes. On present study, HPV detection and typing was performed on tumors derived from hypo pharynx of 24 patients diagnosed with cancer (CID-O: C12,0 to C13,9). All samples was submitted to PCR with generic primers MY09/11 and GP05/06, as specific primers to HPV 6, 11, 16, 18, 33, 35, 45 and 58. Results shows that on 9 of 24 samples, HPV were detected by generic primers (a rate of 37,5%) and HPV types 16, 18 and 45 were identified, with a sample presenting coinfection of HPV 16 and 18.
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    Estudo de associação ampla do genoma bovino para lactação ajustada em 305 dias em girolando
    (Universidade Federal de Goiás, 2015-10-19) Cruz, Alex Silva da; Garcia, José Fernando; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4727050P5; Cruz, Aparecido Divino da; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793956J0; Minasi, Lysa Bernardes; Reis, Ângela Adamski da Silva; Taveira, Rodrigo Zaiden; Sereno, José Robson Bezerra
    Genomic selection in a dairy cattle breeding is a new strategy in national livestock. Genome wide association study (GWAS) is known as a strategy that involve the use of molecular markers panels distributed throughout the genome which are selected for the identification of chromosomal regions that are important for the interest traits. The aim of this study was apply the GWAS strategy for 305-day milk yield in Girolando cows. We did the genotype from 404 Girolando and after quality control analysis remained 337 individuals and 45.622 markers. The GWAS analysis resulted in 52 SNPs associated to 305-day milk yield. Of these, 23 SNPs were linked to Known genes and only 3 SNPs were linked to NUB1, SLC24A2 and DGAT1 genes that already were associated with cattle lactation. The other SNPs have no relationships described in the cattle lactation literature. In addition, the milk production QTL analysis resulted in 52 SNPs and 14 genes linked or close to 1Mb of the SNP marker. The ARS-BFGL-NGS-414 SNP on BTA19 at 47.9Mbp is located near to GH1 gene. This gene is commonly accepted as causal gene for Quantitative Character Locus of milk production mainly affecting the yield in liters and solid milk components. Thus, our data suggest that NUB1 and SLC24A2 genes could be considered as candidate genes to understand the milk production in Girolando breed. Like this DGAT1 and GH1 genes are valuable predictive markers to be added to genomic selection of dairy cattle in breeding program.
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    Caracterização genética da população do estado de Goiás baseada em marcadores STRs autossômicos e do cromossomo Y
    (Universidade Federal de Goiás, 2013-12-17) Gigonzac, Thaís Cidália Vieira; Cruz, Aparecido Divino da; http://lattes.cnpq.br/7868817504129985; Cruz, Aparecido Divino da; Silva, Cláudio Carlos; Vasconcelos, Breno de Faria e; Rodrigues, Flávia Melo; Georg, Raphaela de Castro
    (Sem resumo em outra língua)
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    Alteração no padrão de expressão de genes associados ao perfil leucemogênico da leucemia linfóide aguda infantil: antes e depois da quimioterapia de indução
    (Universidade Federal de Goiás, 2013-01-13) Minasi, Lysa Bernardes; Silva, Daniela de Melo e; Cruz, Aparecido Divino da; http://lattes.cnpq.br/7868817504129985
    The ALL is a malignant disorder that originates from a precursor cell lympho-hematopoietic system compromised for the development of B or T lymphocyte lineage.The precursor cell acquisition by a series of genetic abnormalities alters the normal process of maturation leading to cellular differentiation arrest and leukemic clone proliferative advantage on cells of hematopoietic tissue. More than 50 recurrent genetic alterations have been identified in the ALL. These often involve genes known or putative role in the development of lymphocytes and in the case of leukemogenesis.In this study, the variation in the expression of molecular markers was analyzed using PCR methodology array on 16 children with ALL before treatment and at the end of induction chemotherapy (D +28). These patients were diagnosed in HAJ and SCMG, from May 2012 to January 2013. Samples of bone marrow or peripheral blood were sent to NPReplicon-PUC-GO. In the present study we observed a negative correlation between gender and immunophenotype (p = 0.016), females have a greater association with immunophenotype B and less associated with immunophenotype T. We also observed a positive correlation between immunophenotype and age (p = 0.04), immunophenotype and marker CD10 + (p = 0.03), immunophenotype and risk group (p = 0.015) and marker CD10 + and risk group (p = 0.043). Before treatment the gene RUNX1 met with increased expression by 5.0 times compared to the control group and after induction chemotherapy was observed a reduction in its expression. The expression pattern of the gene TAL1 showed significant decrease, with the exception of post-treatment analysis showed that an increase in its expression. A positive correlation was observed between the expression of BAX and BCL2 (r = 0.94 and p <0.0001. We demonstrated a significant difference in gene expression pattern of ALL at diagnosis and after induction therapy. We conclude our observation regarding the gene expression profile in patients with ALL enrolled in this study, but to define a panel of molecular markers is necessary to evaluate several other genes involved in the process of leukemogenesis in ALL with the help of other methodologies.
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    O Papel da variação do número de cópias genômicas no fenótipo clínico de deficiência intelectual em uma coorte retrospectiva da rede pública de saúde do Estado de Goiás
    (Universidade Federal de Goiás, 2014-03-31) Pereira, Rodrigo Roncato; Silva, Daniela de Melo e; Cruz, Aparecido Divino da; http://lattes.cnpq.br/7868817504129985
    Intellectual disability is a signal comprising a set of clinically and genetically heterogeneous disorders in which the development and/or function of the brain is compromised. This deficiency is characterized by significant limitations both in intellectual functioning and in adaptive behavior and is observed begins before 18 years of age. It is characterized by a high degree of variable expression, and the expression of a wide range of phenotypes, ranging from various genetic syndromes known to characteristics non-syndromic and psychological and/or psychiatric disorders. The etiology is still poorly understood and about half of the cases are unclear. In recent years, the chromosomal analysis by microarray has revolutionized the evaluation of patients with developmental delay or intellectual disability. By this method, the genome of a patient is examined to detect gains or losses of genetic material that are usually too small to be detected by chromosome banding studies. Genomic deletions and duplications have an important role in characterizing genetic diseases, including many neurological disorders and neural development. Identifying these changes may contribute to the clinical management of affected individuals and assist their families, and furthermore, can provide information on the processes of development and brain function. In this context the main objective of this study was identified possible submicroscopic genomic changes associated with intellectual disability, using a platform Chromosomal Microarray high resolution in patients referred by doctors of public health from Goiás state and had initially a normal karyotype. Thus 15 patients with intellectual disabilities were tested by high resolution HD CytoScan Array (Affymetrix) tecnology which detected the presence of 33 variations in the number of genome copies in 10 (66.7%) of the probands. Nineteen microduplications (57.6%) and 14 microdeletions (42.4%) were observed, and 17 CNVs (51.5%) were neutral, 7 (21.2%) pathogenic, 5 (15.15%) potentially pathogenic and 4 (12.12%) of uncertain significance. Five patients showed no change in the number of copies. In this study, we could propose a genetic etiology for the phenotype of 8 patients and thus the diagnostic yield of the platform used was 53.3%. Although modest, this study was significant because this technology was first employed in the state of Goiás and thus, could contribute more genetic information about this complex and heterogeneous neurological sign of great importance to global public health.
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    Implicações do polimorfismo genético de cyp1a1, gstm1 e gstt1 na suscetibilidade do carcinoma espinocelular da laringe
    (Universidade Federal de Goiás, 2008-05-30) Silva Junior, Raimundo Lima da; Cruz, Aparecido Divino da; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4793956J0
    The larynx is a tubular organ of the aerodigestive tract whose main function is the production of voice, in addition to tasks related to the protection of the lower airways and swallowing food. The squamous cell carcinoma presents itself as a multifactorial disease and epigenetic being influenced by environmental factors, behavioural and relate to the individual. Several polymorphic genes that encode enzymes involved in the biotransformation of the carcinogens have been associated to the development of cancer, especially in squamous cell carcinoma of head and neck. The CYP1A1m, GSTM1 and GSTT1 genes which catalyzes the oxidation of PAHs in phenolic and epoxides products. The purpose of this study was to evaluate the epidemiological data of patients diagnosed with squamous cell carcinoma of the larynx from the Cancer Registry of Population basis of Goiânia and from Association of Cancer Combat in Goiânia, analyzing data from 63 medical records followed in a period of 6 year; establish the allelic profiles of the gene CYP1A1m, GSTM1 and GSTT1 in casecontrol groups investigating the degrees of suscetibility of patients diagnosed with squamous cell carcinoma (SCC) of the larynx, according to smoking and alcoholism habits. In total 112 samples were evaluated, 63 from patients with SCC of the larynx and 49 patients in the control group. The CEC of the larynx was about 3,5 times more frequent in men than in women. The rate of survival on general was approximately 66% to 6 years. The smoking and ethilic habits associated have a significantly lower survival. No significant differences were found in the staging analysis and treatment of patients. Were found allelic frequencies of CYP1A1m1 of 52,4% (34/62) and 63,3% (31/49) for the wild allele T and 44,4% (28/62) and 34,7% (18/49) for the mutant allele C. There were no statistically significant associations between allelic variants and genotypic CYP1A1m1 with squamous cell carcinoma of the larynx. Positive genotypic frequencies were observed for the genes GSTM1 and GSTT1 of 41.3% (26/63) and 54.0% (34/63) to the patients with laryngeal cancer, and 49,0% (24/49) and 51,0% (25/49) for the control group, respectively. For the assessment of genotype GSTM1 (null) and GSTT1 (null), the patients if the case group had 58,7% (37/63) and 46,0% (29/63) of genotypes for GSTM1 null and GSTT1, while the patients in the control group showed 51,0% (25/49) and 40,8% (20/49). There was no statistically significance in associations of genotypic variants GSTM1 (null) and GSTT1 (null) with the larynx squamous cell carcinoma. In this context, an experimental study was accomplished in the intention of evaluating the function of the genes Cyp and Gst in the metabolism of the Cyclophosphamide. This study addressed the Cyclophosphamide toxicological evaluation and analysis of the polymorphism of Cyp2a29 and Gstp1 BALB/c genes in mice, correlating them with the toxicity of drugs through the assessment of organs commonly affected. It was determinated the DL50 of the 474mg/kg. Subsequently, another 40 mice were used on the assessment of the genetic polymorphism of genes Cyp2a29 and Gstp1. As for toxicity, cyclophosphamide caused reduction in body weight at different doses and kidneys, spleen, liver, heart and lungs. The animals that received a dose of 500mg/Kg died in 24 hours, three animals with a dose of 250mg/Kg died the end of one week. The evaluation of toxicity showed changes of varying degrees of congestion observed in the spleen, liver and heart. There were not found statistically significant differences between the frequencies of allelic and genotypic to Cyp2a29 and Gstp1 in groups of animals studied. This observation should be probably the characteristic line BALB/c are isogenic. Studies that make the use se of tests of genetic suscetibility, epidemic evaluation, combined to the evaluation anatomopathological they allow the study of the interaction genetic atmosphere and a possible standardization of various chemotherapy protocols for treatment.