Introduction & Objective: Infertility affects 10-15% of couples worldwide, and male factors account for nearly half of all infertility cases. Evidence suggests that genetic variation in anti-oxidant enzymes could influence male infertility. Glutathione peroxidase 1 (GPx1) is an anti-oxidant selenoenzyme that detoxify peroxide radicals. GPx1 Pro198Leu polymorphism causes an aminoacid change from Pro to Leu at codon 198, with the Leu variants being less active than its Pro counterpart. The aim of this study was to determine the association between GPx1 Pro198Leu polymorphism and idiopathic male infertility.Materials & Methods: The case – control study comprised of two groups: 100 infertile patients and 120 fertile healthy control men. Genotyping was carried out by polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) using ApaI endonuclease. Chi-square test was applied for statistical comparison of genotype data.Results: The prevalence of genotype frequencies of the GPx1 gene Pro/Pro, Pro/Leu, Leu/Leu were 13%, 76%, 11% in infertile male, respectively, while in the control were 24.17%, 67.5%, 8.33%, respectively. Allele frequencies of the GPx1 gene Pro, Leu were 0.51, 0.49 in infertile male, while in the control were 0.58 and 0.42, respectively. No significant differences between cases and controls were found in the allelic and genotype distribution of the GPx1 Pro198Leu polymorphism (P>0.05).Conclusion: In conclusion, the overall results of the study indicate that GPx1 Pro198Leu poly-morphism is not associated with idiopathic male infertility. However, further research is re-quired to clarify the role of GPx1 gene in idiopathic male infertility.

Introduction: Preeclampsia is a common and serious hypertensive disorder affecting approximately 5-8 % of pregnancies. The biology of the disease is complex and not understood. This disease associated with increased blood pressure more than 140/90 mmHg in the second half of pregnancy and proteinuria more than 300 mg/24 h and is considered as one of the three leading causes of maternal and fetal mortality and related complications. This complication is a systemic disorder and can lead to difficulties in the mother, such as kidney and liver dysfunction. As well as, the risk of injury in the fetus, such as fetal growth restriction, which is considered as one of the most important causes of neonatal mortality, is common. Various factors are involved in the onset of this disease including vascular activating proteins, oxidative stress, endothelial damage and other cases (1-5). Oxidative stress is an imbalance between the production of ROS and antioxidant defences, resulting in increased levels of ROS with resultant damage of cellular components including DNA, proteins and lipids. Normal pregnancy is characterised by a low grade oxidative stress; there are increased circulating levels of oxidised low-density lipoproteins and a reduction in total antioxidant capacity in pregnant women when compared with non-pregnant women. Excessive oxidative stress is generally thought to be involved in the pathology of many pregnancy-related disorders such as fetal growth restriction (FGR), preeclampsia and miscarriage. Dysfunctional placentation is proposed to provoke a hypoxic reperfusion injury causing elevated oxidative stress in preeclampsia. By 10– 12 weeks’ gestation in normal pregnancy maternal blood flow in the placenta causes a local increase in oxygen and elevation in the activity of the antioxidant enzymes. One of the most relevant enzymatic antioxidants is glutathione peroxidase (GPx). Currently there is no treatment for preeclampsia except delivery of the placenta and the baby, with the attendant risk of iatrogenic prematurity and significant neonatal morbidity and mortality. As a result, intensive research endeavours have focused on defining the molecular mechanisms of preeclampsia and the identification of new pre symptomatic biomarkers of the condition (6-11). It seems that the polymorphisms in the Glutathione peroxidase1 gene is one of the leading causes of the disease (13, 14). This study aimed of this study was to evaluate the relationship between Glutathione peroxidase1 gene (GPX1pro198Leu) polymorphism with preeclampsia. Materials and method: In the present case-control study conducted at Islamic Azad University of Kazerun in 2017, 150 preeclampsia patients with systolic blood pressure ≥ 140 mm Hg or diastolic blood pressure ≥ 90 mm Hg with two repetitions and at least 6 hours apart and also Proteinuria /0 0. 3 g in 24-hour urine with ≥ +1 were in urine strip test were selected from patients referred to Vali-e-Asr Hospital in Kazerun for further molecular studies. In order to select women in the case group, first all diagnosed with preeclampsia were selected as candidates for the study, and after reviewing the clinical history, women with a history of any internal diseases were excluded from the study. The women in the control group (150 women) were selected from healthy pregnant women who had referred to the hospital for routine examinations and were matched to the patient group in terms of gestational age and place of residence. 5 ml of peripheral blood was collected from the subjects. Then DNA was extracted by salting out method. Polymorphism was determined using PCR-RFLP method. Data were analyzed using SPSS software and Chi-square statistical tests. Results: Results showed that the products of each genotype appeared on the gel as bands of 261 and 75 bp for CC homozygotes, 336, 261 and 75 bp for CT heterozygotes and 336 bp for TT homozygotes. The results of chi-square test showed a significant relationship between the control group and the patient in the frequency of CC, CT and TT genotypes in the GPx1Pro 198Leu polymorphism position (PGPX1 = 0. 047). There was no significant relationship between the control group and the patient in the frequency of both C and T alleles in the Gpx1Pro198Leu polymorphic position (PGPX1 = 0. 671). The results of the study of the relationship between Gpx1Pro 198Leu polymorphism and paraclinical factors, including; Severity of preeclampsia, urinary protein excretion, patient swelling, age at onset of disease, primi para, multiple pregnancy, previous history of preeclampsia, history of miscarriage, diabetes mellitus and hypothyroidism showed that except for the multipara parameter (PGPX1 = 0. 018) Significant relationship between other parameters studied such as Severity of preeclampsia (PGPX1 = 0. 209), urinary protein excretion (PGPX1 = 0. 710), patient swelling (PGPX1 = 0. 419), age at onset of disease (PGPX1 = 0/069), primipara (PGPX1 = 0/160), previous history of Preeclampsia (PGPX1 = 0/539), history of miscarriage (PGPX1 = 0/708), diabetes mellitus (PGPX1 = 0 / 110) and hypothyroidism (PGPX1 = 0. 221) with the mentioned polymorphism was not seen in the patient and control groups. Conclusion: Due to serious risks of preeclampsia to mothers and infants, identifying markers that can predict the risk of this outcome is importance. Researchers have linked the gene polymorphisms to individual disease susceptibility and response to drug, and suggest that their presence may be a predictor of disease risk. In the present study, the relationship between Glutathione peroxidase1 gene (GPX1pro198Leu) polymorphism with preeclampsia was investigated. This polymorphism, by replacing cytosine with thymine at nucleotide 599 (C. 599C> T) of exon 2 of the GPX1 gene, converts the amino acid proline to leucine and affects enzyme activity. The results showed that the frequency of CC, CT and TT genotypes, despite the frequency of C and T alleles in the Gpx1Pro198Leu polymorphism site, the gene encoding glutathione peroxidase 1 among pregnant women with preeclampsia and Healthy pregnant women have a significant difference. In 2012, a polymorphism (rs713041) related to the gene encoding the enzyme glutathione peroxidase 4 with preeclampsia was also demonstrated. Similarly, in this study, the existence of a significant difference in the percentage of homozygous individuals for the C allele in the polymorphic position indicates the association of polymorphism with the incidence of the disease (19). There are also other studies linking the T allele of the Gpx1Pro198Leu polymorphic site to the occurrence of some diseases such as They have proven lung malignancy (20), cerebral hemorrhage (21) and coronary artery disease (22). Also, in a recent study conducted in 2018, the presence of CAT-21A / T polymorphism in the catalase-encoding gene has been introduced as a predisposing factor for preeclampsia (23). In this study, the association of Gpx1Pro198Leu polymorphism with factors such as; Severity of preeclampsia, urinary protein excretion, patient swelling, age at onset of disease, primi para, multiple pregnancy, previous history of preeclampsia, history of miscarriage, diabetes mellitus and hypothyroidism Checked out. In other cases except for the multiplicity parameter, no significant relationship was observed with Gpx1Pro198Leu polymorphism. However, since the occurrence of preeclampsia is most likely the result of the interaction of several polymorphic genes (24), the absence of a significant association between a gene polymorphism and disease risk factors will not be unexpected, so it is better to achieve a more reliable assessment of polymorphism status in different genes should be examined. Considering the significant relationship between Gpx1Pro198Leu polymorphism and the occurrence of preeclampsia, which emphasizes the role of genetic predisposition in the occurrence of this disease, the presence of this polymorphism can be predicted as a factor Considered the cause of preeclampsia.

To protect cells and organs against reactive oxygen species, the body has evolved an antioxidant protection system. CAT and GPX1 gene products act as an important defense barrier against free radicals. Thus, any defects or polymorphisms in these genes may be associated with the risk of many cancers, such as stomach cancer. The aim of this study was to investigate the relationship between genetic polymorphism of GPX1 Pro198Lue and CAT A-21T with the risk of gastric cancer. 159 patients with gastric cancer and 242 healthy controls participated in present study. Genotyping of GPX1 Pro198Lue and CAT A-21T were done by polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) method. Differences in the frequency of the control group and patients were assessed using the X2 test and risk was calculated with an unconditional logistic regression was used to estimate odds ratios (OR) and 95 confidence intervals. As a result, there was significant association between CT genotype (OR=1.53, CI=1.01-2.32, P=0.042) and CT+TT genotype (OR=1.50, CI=1.00-2.26, P=0.046) of GPX1 Pro198Lue polymorphism and gastric cancer but there was no significant association between TT genotype compared with AA genotype of CAT A-21T polymorphism and gastric cancer (OR=1.45, CI=0.76-2.76, P=0.248).

Kidney transplantation is a therapeutic approach for patients with end-stage renal disease. Despite the increase and improvement of this therapeutic process, yet because of recipient immune response against the donor tissue, rejection is common and the main cause of failure of the procedure. Transplanted kidney is prone to exposure to acute rejection for different reasons. Oxidative stress with negative impact on the survival and function of transplanted tissue can cause graft rejection. GPX1 and SOD1 are antioxidant enzymes. The aim of this study was to investigate the relationship between polymorphisms of GPX1pro198leu (rs1050450) and SOD1A251G (rs2070424) with acute rejection of kidney transplantation. In this study 262 kidney transplant recipients, 46 of whom had acute rejection, were enrolled. Genotyping performed by PCR-RFLP method and data were analyzed by SPSS statistical software. Analysis the genotype and allele frequencies in GPX1pro198leu polymorphism between patients with and without renal acute rejection, showed no significant difference. The A251G polymorphism in the SOD1 gene also showed no significant differences between patients with and without acute rejection. In conclusion, the GPX1 and SOD1 mentioned gene polymorphisms genotype and allele frequencies have no role in the incidence of renal acute rejection.

Background: Oxidative stress is a condition in which the balance is disrupted between reactive oxygen species (ROS) and antioxidant. Glutathione peroxidase 1 (GPX-1), as one of the antioxidant enzyme remove the ROS in a continuous process. One of the functional polymorphism of GPX1 gene is Pro198Leu polymorphism. The aim of this study was to study the association between GPX-1 Pro198Leu polymorphism with the risk of colorectal cancer.Materials & Methods: in this case-control study, 130 patients with colorectal cancer were compared with 170 healthy subjects. Genomic DNA was extracted from peripheral blood leukocytes. Determination of DNA genotyping in GPX-1 Pro198Leu polymorphism were performed by the polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP). The c2-test was used for statistical analyses.Results: The GPX1 genotype frequencies were 64% for CC, 24% for CT and 12% for TT in control group, and 60% for CC, 30% for CT and 12% for TT among the patients. The C allele frequency in cases and controls including 0.75 and 0.76 and T allele frequency was including 0.25 and 0.24. Based on these data, there was no significant differences in the GPX1 Pro198Leu genotypes and allele frequencies between cases and controls (P=0.2).Conclusion: The result of this study suggested that GPX-1 Pro198Leu polymorphism could not be a risk factor for colorectal cancer. However, studies in larger populations are needed in order to confirm the results.

Increasing of reactive oxygen species (ROS) under iron toxicity is considered as one of the major constraints to rice production. In this study the alterations of SOD, GPX1 and MDHR expression level in two genotypes of rice, Pokkali (as tolerant) and IR64 (as sensitive) were monitored under different concentrations of iron levels [(0) (nonstress)], 100, 250, 400 and 500 mg/lit-1Fe-EDTA). The treatments were done when the plants were at 4-leaf stage and lasted for two weeks. Results showed that the expression levels of genes in Pokkali were higher than IR64. The expression level of SOD in IR64, increased at iron concentration increased, while it decreased at higher Fe-level. The expression level of GPX1 was increased in IR64, but decreased in Pokkali. The expression level of MDHR in IR64 was decreased at early stage of Fe-treatment, but then increased. Inversely, in Pokkali MDHR expression reduced constantly under Fe stress. Overall, the relative over expression of genes in Pokkali and presence of different expression levels of them between different concentrations of Fe in tolerant and sensitive genotypes indicate that the gene could remarkably effect on the tolerant level of pokkali by reducing ROS production under Fe-toxicity.

Inroduction & Objective: Increasing in temperature and drying of pastures cause water and nutritional stress to animals. In this study, resistance control genes in crossbred and native sheep were examined. Material and Methods: In this study, ten cross of Romanov native male lambs and ten purebred male native lambs in 4 treatments and 5 replications in each group were used. They are divided into two groups with normal and water restriction condition. At the end of the experiment, liver tissue samples were collected from slaughtered animals and it was kept in liquid nitrogen, to investigation of gene expression whole RNA was extracted and purified and the cDNA was synthesis. In the end Real Time PCR reaction were performed using specific primers. For statistical analysis we used randomized design as factorial analysis method using SAS 9. 2. Results: By extracting the genes, it was found that the expression of GPX1, TFAM, SIRT3, PRKAA1, NRT2 genes increased under stress in native sheep compared to crossbred sheep. Conclusion: The expression of GPX1, TFAM, NRF2, SIRT, PKAA1 genes in the liver of two groups of native and crossbred in normal and stress conditions indicate that Under stress, these four groups of genes act as oxidative process and store energy and prevent energy loss and protect the cell. Due to the genetic compatibility of native sheep with the drought conditions of the region, it makes the animal more resistant to heat and disease.

Introduction. Nephrolithiasis is a common multifactorial kidney disease with worldwide distribution. Compelling evidence, regarding the function of kidney in maintaining the body homeostasis, suggests the role of oxidative stress in the pathogenesis of nephrolithiasis. Glutathione peroxidase 1 is a major antioxidant enzyme, preventing oxidative damage to renal cells by detoxifying hydrogen and lipid peroxides, which may involve in its pathogenesis. The purpose of the present study was to determine the possible association of glutathione peroxidase 1 gene (GPX1) proline-to-leucine substitution at amino acid 198 (Pro198Leu polymorphism) with the risk of developing nephrolithiasis in south Iranian patients. Materials and Methods. Association of Pro198Leu polymorphism in exon 2 of GPX1 gene was investigated in 150 patients with nephrolithiasis and 184 healthy age-, sex-, and ethnically-matched control group using polymerase chain reaction-restriction fragment length polymorphism. Results. Regression analysis demonstrated that the frequency of the genotypes carrying at least 1 Leu allele, in both dominant and codominant model for this allele, was significantly higher in patients compared with the controls. However, significant association was found neither with wild-type allele, nor with polymorphic allele with the risk of nephrolithiasis. Conclusions. Findings of our study provide potential support in favor of the role of oxidative stress in the pathogenesis of nephrolithiasis in patients from south of Iran. The results indicate that GPX1 may be a key player in nephrolithiasis development.