Yazan: admin Tarih: Tem 23rd, 2010 | Kategori::
Prostate cancer(Prostat Kanseri)
Cancer Invest. 2006 Feb;24(1):41-5.
Silig Y, Pinarbasi H, Günes S, Ayan S, Bagci H, Cetinkaya O.
Cumhuriyet University, Science and Art Faculty, Department of Biochemistry, Sivas, Turkey. ysilig@cumhuriyet.edu.tr
Abstract
Prostate cancer is the most common cancer among men in many countries. Although the etiology of prostate cancer largely is unknown, both genetic and environmental factors may be involved. Advanced age, androgen metabolism, and heredity-race have been reported to be possible risk factors. On the other hand, several studies indicate that genetic polymorphisms in biotransformation enzymes play a role in prostate cancer development. In this study, association of the prostate cancer risk with genotype frequencies of the Phase I (CYP1A1) and Phase II (GSTM1 and GSTT1) biotransformation enzymes was investigated in 321 Turkish individuals (152 prostate cancer patients and 169 age-matched male controls). The presence or absences of the GSTM1 and GSTT1 genes were determined by a PCR-based method. Genotypes of CYP1A1 were determined by MspI-RFLP. The prevalence of GSTM1 null genotype in the cases was 64 percent, compared to 31 percent in the control group, indicating a strong association (OR = 4.08, 95%CI = 2.50-6.69). No association was observed between either GSTT1 null genotype or CYP1A1 polymorphism and prostate cancer incidence. No statistically significant association was observed between smoking status of the patients and any of the polymorphisms studied. In conclusion, results of this study indicate that only the GSTM1 null genotype may play an important role as a risk factor for prostate cancer development in Turkish population.
Yazan: admin Tarih: Tem 23rd, 2010 | Kategori::
Melanocortin-4 Receptor
Clin Appl Thromb Hemost. 2010 Jun 7.
Demiralp DO, Berberoglu M, Akar N.
Abstract
The most common Melanocortin-4 receptor (MC4R) missense variant Val103Ileu (rs2229616) is related to obesity. In this study, we examined the distribution of MC4R polymorphisms both in the clinical pediatric obese group and in the high/low-socioeconomic school group. 24 probable exogene obese children without family history (group I), 66 probable familial obese children (group II), and 111 complicated obese children (group III) were included. Groups I and II obese participants were gathered in a school-based epidemiologic study and compared with 49 apparently healthy non-obese controls. Significant difference in genotype distribution was observed between the groups I and II. Val 103 Ile polymorphism was more common among group III (4.5%). Furthermore, we detected Glu 42 Lys (18.18%) polymorphism in our population, which was not previously reported. Frequency of Val 103 Ile (A) allele polymorphism was 0.75 and 2.25; Glu 42 Lys A allele polymorphism was 9.0 and 1.5, in groups II and III, respectively. None of the MC4R mutations were found in high-socioeconomic school and in control groups. Our data indicated that MC4R polymorphisms were more frequent both in clinical pediatric obese group and in low-socioeconomic school group. In addition, our data revealed that carrying the polymorphism may increase the hereditary form of obesity.
Yazan: admin Tarih: Åžub 25th, 2010 | Kategori::
Paraoxonase
Turk Kardiyol Dern Ars. 2009 Oct;37(7):473-8.
Taşkiran P, Cam SF, Sekuri C, Tüzün N, Alioğlu E, Altintaş N, Berdeli A.
Department of Medical Biology and Genetics, Medicine Faculty of Celal Bayar University, Manisa, Turkey.
OBJECTIVES: Paraoxonase (PON1) is a high-density lipoprotein (HDL)-associated esterase that hydrolyses lipoperoxides. PON1 serves as a protective factor against oxidative modification of LDL, suggesting that it may play an important role in the prevention of atherosclerotic process. Research has focused on two polymorphisms: leucine (L allele) to methionine (M allele) substitution at codon 55, and glutamine (A allele) to arginine (B allele) substitution at codon 192. STUDY DESIGN: We examined amino acid changes at codon 55 and 192 in the PON1 gene by polymerase chain reaction and using restriction enzymes in 120 patients (92 men, 28 women; mean age 48.2+/-4.3 years) with premature coronary artery disease (CAD) and in 102 healthy subjects (80 men, 22 women; mean age 46.8+/-5.2 years) with no history of CAD and a normal electrocardiogram. RESULTS: Distribution of genotypes in the patient and control groups at codon 55 were 6.7% and 4.9% for MM, 46.7% and 29.4% for LM, 46.7% and 65.7% for LL, respectively. The frequency of genotypes at codon 192 were as follows: 4.2% and 2% for RR, 40% and 35.3% for QR, and 55.8% and 62.8% for QQ, respectively. While the frequency of PON1 55M allele was higher in the CAD group (0.3 vs. 0.2), PON1 192R allele frequency did not differ (p>0.05). There was a significant relationship between the PON1 M/L55 polymorphism and CAD (p=0.017), whereas the R/Q192 polymorphism was not associated with CAD (p=0.445). CONCLUSION: These data suggest that the PON1 M/L55 polymorphism shows a significant relationship with CAD and the Q/R192 polymorphism is not a major risk factor causing susceptibility to CAD in our population.
