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Öğe The -31 G/C promoter gene polymorphism of survivin in Turkish patients with colorectal cancer(Sri Lanka Medical Assoc, 2018) Budak, M.; Bozkurt, C.; Cetin, S. E.; Tuncel, H.Introduction Survivin (also known as birc5) is the first protein discovered among the apoptosis-regulating gene family referred to as inhibitor of apoptosis proteins (IAPs). It is expressed and controlled during cellular differentiation and development in human beings. Survivin expression has been shown in a number of cancers and has been associated with cancer development. Objective In our study, we compared normal and tumoural tissue samples, which were obtained from 100 patients diagnosed with colorectal cancer, at Department of Pathology, Istanbul University. Methods The present study employed PCR-RFLP to identify the -31 G/C polymorphism in the promoter region of the survivin gene. Distribution of the survivin polymorphism was compared between control and tumoural tissue samples using the chi-square test. Results Comparison of all samples revealed that there was significant difference in distribution of survivin promoter -31G/C between tumour and normal tissue of the patient group (p<0.05). When genotypes were compared according to gender, there was no statistically significant difference in the distribution of survivin promoter -31G/C in females p=0.420 or males p=0.309. Conclusion A significant difference was seen in distribution of C allele in tumour tissue compared to normal tissue.Öğe ASSOCIATION OF ANGIOTENSINOGEN T174M AND M235T GENE VARIANTS WITH DEVELOPMENT OF HYPERTENSION IN TURKISH SUBJECTS OF TRAKYA REGION(Taylor & Francis Ltd, 2008) Basak, A. Ay; Sipahi, T.; Ustundag, S.; Ozgen, Z.; Budak, M.; Sen, S.; Sener, S.Genetic determinations of human essential (primary) hypertension are discussed reviewing the candidate genes. Angiotensinogen (AGT) gene, coding the precursor of potent vasoactive hormone angiotensin II, in renin- angiotensin-system (RAS) has been reported to be associated with the onset of hypertension. The aim of this study was to investigate the role of variation in the 174 and 235 sites in exon 2 in AGT gene in the developing of primary hypertension in Turkish subjects from Trakya region. Our study involved 136 subjects, 84 hypertensive and 52 gender and age matched controls. T174M and M235T polymorphisms of the AGT gene were investigated using allele specific polymerase chain reaction (PCR) assay and restriction fragment length polymorphism (RFLP). The frequency of genotypes of the variant T174M in the patients with primary hypertension was TT=%73.8, TM=%26.2, and MM=%0.0, that were not different from the controls TT=%73.1, TM=%26.2, and MM=%1.9. And for M235T; the genotype frequencies in patients with primary hypertension were MM=%19.0 MT=%54.8, and TT=%26.2, which were again not significantly different from that of the controls MM=%26.9 MT=%46.2 and TT=%26.9. In conclusion this study, shows that T174M and M235T variants of the AGT gene were not associated with primary hypertension in Turkish subjects from Trakya region.Öğe Association of eNOS Glu298Asp gene polymorphism with ischemic stroke in Turkish patients(Wiley-Blackwell, 2008) Guldiken, B.; Sipahi, T.; Guldiken, S.; Ustundag, S.; Turgut, N.; Budak, M.; Ozkan, H.[Abstract Not Available]Öğe Endothelial nitric oxide synthase intron 4a/b polymorphism in coronary artery disease in Thrace region of Turkey(Taylor & Francis Ltd, 2014) Sivri, N.; Unlu, A.; Palabiyik, O.; Budak, M.; Kacmaz, Y.; Yalta, K.; Sipahi, T.Coronary artery disease (CAD) is one of the frequent cardiovascular mortality causes in the world. Common risk factors explain only about half the risk of CAD. The healthy familial predisposition to CAD, combined with advances in genetic analysis, has led to a number of studies in recent years making an effort to identify the genetic factors that influence the risk. The approach taken by most studies was to examine the association of naturally occurring genetic polymorphisms in candidate genes with risk of or severity of CAD. Endothelial nitric oxide synthase (eNOS) is important for vascular and tissue protection and is found in endothelial cells that encompass the entire vasculature, including the vessels in the heart. Nitric oxide (NO) is produced in a catabolic reaction in the endothelial cells, neurons, glia and macrophages by nitric oxide synthase (NOS) isoenzymes. eNOS is a subgroup of this family of enzymes that catalyses the production of nitric oxide (NO) from L-arginine and oxygen, which leads to vascular relaxation by activating the guanylate cyclase. This finally induces smooth muscle relaxation. The aim of this study was to investigate the allelic frequency and the genotypic distribution of the variable number of tandem repeat 27 (27 VNTR) gene polymorphism in intron 4 of the eNOS (eNOS 4a/b) gene in Thrace region, to compare CAD patients with appropriate healthy controls and to correlate the genetic findings with CAD subtypes. The study group included 281 (153 subjects with CAD and 128 controls) patients. The eNOS polymorphism was identified with a polymerase chain reaction. Genotypes were defined as aa, ab and bb according to the presence of a and b alleles. In this case-control study, we found that there was sensible correlation between eNOS gene intron 4a/b VNTR polymorphism and the risk of CAD in Thrace region of Turkey. However, there was no major difference for the genotype distribution and the allelic frequency among the CAD subtypes. Further studies on the interaction of such genes are needed to clarify the association between eNOS 4a/b polymorphism and CAD patients.Öğe Identifying the Interaction Site of Poly ADP-ribose Polymerase-4 with NAD by Using Molecular Dynami(Springer, 2017) Unlu, A.; Dinc, B.; Budak, M.; Sipahi, T.; Bektas, M.; Nurten, R.[Abstract Not Available]Öğe Mutation detection in the promoter region of survivin gene on N-methyl-N-nitrosourea induced colon tumor model in experiment(Comenius Univ, 2014) Budak, M.; Korpinar, M. A.; Kalkan, T.; Tuncel, H.Survivin (also known as BIRC5) is one of the first reported inhibitors of apoptosis proteins (IAPs), which is an important family of proteins that regulate apoptosis. It is developmentally regulated and expressed during cell differentiation in humans, mice and rat. Survivin is expressed in a series of human cancers and it has been widely accepted that survivin is strongly related to the onset and development of cancer. In the present study, we tried to determine differences in the promoter region of survivin gene in colon tissue samples from N-methyl-N-nitrosourea (MNU) induced rat colon tumor model and control group. Polymerase chain reaction (PCR) single strand conformation polymorphism (SSCP) analysis was used for this aim. No significant differences were found in the promoter region of survivin gene between the normal and tumor tissues (Tab. 2, Fig. 1, Ref. 16). Text in PDF www.elis.sk.Öğe Polymorphisms of the angiotensin-converting enzyme and angiotensin II receptor type 1 genes and association with stroke in Turkish subjects of the Trakya region(Wiley-Blackwell, 2008) Sipahi, T.; Guldiken, B.; Budak, M.; Guldiken, S.; Ustundag, S.; Turgut, N.; Ozkan, H.[Abstract Not Available]Öğe Un-methylation of the survivin gene has no effect on immunohistochemical expression of survivin protein in lung cancer patients with squamous cell carcinoma(Comenius Univ, 2017) Yalcin, O.; Budak, M.Survivin is a member of the inhibitor of apoptosis (IAP) family. The function of the survivin protein is to inhibit caspase activation, thereby leading to negative regulation of apoptosis or programmed cell death. This has been shown by the disruption of survivin induction pathways leading to an increased apoptosis and decreased tumour growth. These data suggest that survivin may provide a new target for cancer treatment, which would distinguish transformed cells from normal cells. In the present study, we aimed to investigate exon 1 of the survivin gene by means of methylation-specific PCR and evaluate its impact on survivin protein expression following DNA isolation and bisulphite modification in paraffin-embedded normal and tumour tissues of lung cancer patients with squamous cell carcinoma. We used 41 squamous cancer tissues with methylation in exon 1 of the survivin gene and non-methylation in corresponding tumours. However, the immunohistochemistry staining of these samples demonstrated an increased survivin protein compared to normal tissue. While there is almost no other study to date on this subject matter, we believe that the absence of methylation in exon 1 of the survivin gene may not affect disease prognosis as it has no effect on expression, and possible promoter methylation or transcription factors (Tab. 1, Fig. 4, Ref. 15). Text in PDF www.elis.sk.
