Browsing by Author "Kaya, Ozge Ozer"

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Epigallocatechin 3-gallate applications on HT-29 and MCF-7 cell lines and evaluation of tumor suppressor gene methylation
(2015) Terzi, Yunus Kasim; Kaya, Ozge Ozer; Iseri, Ozlem Darcansoy; Celik, Zerrin; Sahin, Feride Iffet
Epigallocatechin 3-gallate (EGCG) is an antitumor molecule and shows this activity by binding to the active center of a methyltransferase enzyme (DNMT1). The methylation of DNA sequences of tumor suppressor and DNA repair genes is observed in different stages of carcinogenesis. In this study, we analyzed the effect of EGCG on the methylation status of 25 tumor suppressor genes in cancer cell lines HT-29 and MCF-7. HT-29 and MCF-7 cells were incubated with 10 mu M, 20 mu M, and 50 mu M and 1 mu M, 5 mu M, and 10 mu M EGCG for 48 h, respectively. We found promoter hypermethylation of (1) CDH13, GATA5, and RAR beta genes in MCF-7 cell line and (2) RAR beta, ESR1, PAX6, WT1, CADM1, CHFR, CDH13, and GATA5 genes in HT-29 cell line. However, (3) after EGCG application, no changes in methylation status were detected in our samples. Our results suggest that methylation status of tumor suppressor genes did not change with different EGCG doses.
Fetal HLA-G alleles and their effect on miscarriage
(2018) Kubat, Gozde; Koc, Altug; Kirbiyik, Ozgur; Kutbay, Yasar B.; Ozyilmaz, Berk; Ozdemir, Taha R.; Kaya, Ozge Ozer; Koc, Zeynep Peker; 29809322
Background. Immunosuppression at the feto-maternal interface is crucial for a successful pregnancy outcome. Human leukocyte antigen-G (HLA-G) seems to be a major contributor to fetal tolerance. The HLA-G expression is seen in cytotrophoblasts and in maternal blood. Fetal HLA-G acts on decidual antigen-presenting cells (APCs), natural killers (NKs) and T cells. Recent findings revealed that defects in placentation and their consequences are associated with maternal HLA-G variants and their expression levels. Objectives. The objective of this article is to investigate the relationship between fetal HLA-G alleles and miscarriage, which has not been investigated to date. Material and methods. The present study includes 204 recurrent miscarriage (RM) cases who were admitted to our clinic between 2012 and 2016. Twenty-eight miscarriage products without maternal cell contamination and any known pathology were analyzed by HLA-G typing. In addition, 3' untranslated region (UTR) 14-base pair (bp) insertion/deletion polymorphism was also investigated by Sanger sequencing. Results. For our population, the most frequent HLA-G type was G*01:01, both in the study group (30.3%) and in the control group (47%). The study revealed that the G*01:04 allele was significantly associated with miscarriage (p = 0.007). The 3' UTR 14bp deletion was more frequent in the miscarriage group, but there was no significant correlation. Conclusions. HLA-G alleles seem to be related with miscarriage and should be considered in RM cases.
The Role of Heredity and the Prevalence of Strabismus in Families with Accommodative, Partial Accommodative, and Infantile Esotropia
(2020) Eroglu, Fatma Corak; Oto, Sibel; Sahin, Feride Iffet; Terzi, Yunus; Kaya, Ozge Ozer; Tekindal, Mustafa Agah; 0000-0003-0171-4200; 0000-0001-7308-9673; 0000-0001-5612-9696; 32631000; AAJ-4668-2021; AAC-7232-2020; B-4372-2018
Objectives: To investigate the prevalence of strabismus in families of a proband with accommodative, partial accommodative, or infantile esotropia, and to evaluate the mode of inheritance and the role of consanguineous marriages in this prevalence. Materials and Methods: Families of probands with comitant strabismus were invited to participate in the study. The family members of 139 subjects with accommodative, 55 with partial accommodative, and 21 with infantile esotropia agreed to participate. Detailed family trees were constructed. The first- and second-degree relatives were invited for a complete ophthalmological examination, and 518 individuals from 168 families were evaluated. The role of consanguinity, the presence of tropia, phoria (>= 8 PD), microtropia, and hypermetropia (>= 3.00 D) among first- and second-degree relatives were analyzed. Results: A non-Mendelian pattern was found in 49 families (23%), an autosomal dominant pattern in 39 families (18%), and an autosomal recessive pattern in 6 families (3%). The prevalence of consanguineous marriages among parents of probands was 18.1%, 22.6%, and 14.3% in the accommodative, partial accommodative, and infantile esotropia groups, respectively (p=0.652). The prevalence of strabismus in first-degree relatives was 58.9%, 45.5%, and 38.1%, respectively (p=0.07). The prevalence of microtropia in probands' siblings was significantly higher in the accommodative esotropia group (p=0.034). Conclusion: Sporadic cases and non-Mendelian inheritance were more frequent than autosomal recessive inheritance. Autosomal recessive inheritance was found not to be frequent in consanguineous marriages. The prevalence of strabismus and microtropia was significantly higher in families of esotropia cases than in the general population.