Person: ÇEÇENER, GÜLŞAH
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ÇEÇENER
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GÜLŞAH
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Publication Investigation of VHL gene associated with miR-223 in clear cell renal cell carcinoma(Springer, 2021-11-26) Ünal, Ufuk; Çeçener, Gülşah; Ünlü, Havva Tezcan; Vuruşkan, Berna Aytaç; Erdem, Ecem Efendi; Egeli, Ünal; Nazlıoğlu, Hülya Öztürk; Kaygısız, Onur; Tunca, Berrin; Vuruşkan, Hakan; Ünal, Ufuk; ÇEÇENER, GÜLŞAH; Ünlü, Havva Tezcan; AYTAÇ VURUŞKAN, BERNA; Erdem, Ecem Efendi; EGELİ, ÜNAL; ÖZTÜRK NAZLIOĞLU, HÜLYA; KAYGISIZ, ONUR; TUNCA, BERRİN; VURUŞKAN, HAKAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Patoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0003-4913-3616; 0000-0002-3820-424X; 0000-0002-0910-4258; 0000-0001-7904-883X; 0000-0002-9790-7295; 0000-0002-1619-6680; AAH-1420-2021; L-9439-2019; GYU-0252-2022; ABC-1357-2020; AAP-9988-2020; GYU-0252-2022; EEJ-1452-2022; ESY-2704-2022; FLN-9596-2022; ABI-6078-2020; EFH-9523-2022Background Clear cell type renal cell carcinoma (ccRCC) is the most common renal cell carcinoma (RCC). In this study, we examined the expressions of VHL and miR-223 in ccRCC patients' tissues to investigate the possible role in the development of ccRCC.Methods and results This study collected five expression profiles (GSE36139, GSE3, GSE73731, GSE40435, and GSE26032) from Gene Omnibus Data. Expressions of VHL and miR-223 in paraffinized tumor and normal tissues of 100 Turkish patients' ccRCC tissues were determined by bioinformatic data mining and real-time quantitative polymerase chain reaction (qRT-PCR). The VHL gene was subjected to mutational analysis by DNA sequencing, and pVHL was analyzed using western blotting. Our study's t-test and Pearson correlation analysis showed that VHL gene expression in tumoral tissues with a - 0.39-fold decrease was not significantly lower than normal tissues (p = 0.441), and a 0.97-fold increase miR-223 (p = 0.045) was determined by real-time PCR. Also, as a result of DNA sequence analysis performed in the VHL gene, it was found that 26% of the patients have mutations. The mutations for (VHL):c.60C>A (p.Val20=) and (VHL):c.467delA (p.Tyr156Leu) was detected for the first time in Turkish patients.Conclusions The present study demonstrated that the differences in the expression levels of miR-223 have the potential to be biomarkers to determine the poor prognosis in ccRCC.Publication RNA-based markers in biopsy cores with atypical small acinar proliferation: Predictive effect of T2E fusion positivity and MMP-2 upregulation for a subsequent prostate cancer diagnosis(Wiley, 2019-02-01) Eryılmaz, I. Ezgi; Vuruşkan, Berna Aytaç; Kaygısız, Onur; Egeli, Ünal; Tunca, Berrin; Kordan, Yakup; Çeçener, Gülşah; ERYILMAZ, IŞIL EZGİ; AYTAÇ VURUŞKAN, BERNA; KAYGISIZ, ONUR; TUNCA, BERRİN; ÇEÇENER, GÜLŞAH; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Patoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Üroloji Anabilim Dalı.; 0000-0002-9790-7295; 0000-0001-7904-883X; 0000-0002-1619-6680; 0000-0002-9947-848X; 0000-0002-3820-424X; ABI-6078-2020; AAP-9988-2020; AAH-1420-2021; L-9439-2019; AAM-9726-2020; AAH-9746-2021; GWV-3548-2022Background Atypical small acinar proliferation (ASAP) is a precursor lesion of prostate cancer (PC), and PC develops from this suspicious focus or an unsampled malignant gland nearby. However, PC-related molecular alterations that could guide the timing of repeat biopsies and help monitor PC risk in ASAP-diagnosed patients have not been investigated. The purpose of this study was to first investigate the expression of seven different PC-related RNAs that included serine 2 (TMPRSS2): erythroblastosis virus E26 oncogene homolog (ERG) gene (TMPRSS2-ERG, T2E) fusion, alpha-methylacyl-CoA racemase (AMACR), kallikrein related peptidase 3 (KLK3), androgen receptor (AR), prostate cancer specific antigen 3 (PCA3), and matrix metalloproteinases (MMP)-2 and 9. Methods PC-related RNAs were evaluated using a real-time quantitative reverse transcription polymerase chain reaction (RT-qPCR) system in pathologically ASAP-diagnosed prostate biopsy cores from 55 patients presenting with a normal digital rectal examination and a PSA level of 4-10 ng/mL. Results We detected that positive T2E fusion status (P = 0.013) and the expression of AMACR (P = 0.016), AR (P = 0.016) and MMP-2 (P = 0.013) were independently and significantly associated with PC risk in ASAP patients. There were also several statistically significant correlations between expression levels. Additionally, we demonstrated that T2E fusion positive ASAP patients with higher MMP-2 expression were more likely to be diagnosed with PC at a subsequent biopsy during the follow-up period (P = 0.003). Conclusions Although, more clinical validations are needed for the stratification of PC risk in ASAP-diagnosed biopsy cores, our current results indicate that the coexistence of T2E fusion positivity with MMP-2 upregulation may help clinicians adjust their biopsy timetable and/or assessment of PC risk in ASAP-diagnosed patients with a PSA level of 4-10 ng/mL.Publication DPYD c.1905+1G>A promotes fluoropyrimidine-induced anemia, a prognostic factor in disease-free survival, in colorectal cancer(Mary Ann Liebert, Inc, 2021-04-01) Deligönül, Adem; Aksoy, Seçil; Tezcan, Gülçin; Tunca, Berrin; Kanat, Özkan; Çubukcu, Erdem; Yılmazlar, Tuncay; Öztürk, Ersin; Egeli, Ünal; Çeçener, Gülşah; Alemdar, Adem; Evrensel, Türkkan; DELİGÖNÜL, ADEM; AKSOY, SEÇİL; TEZCAN, GÜLÇİN; TUNCA, BERRİN; Kanat, Özka; ÇUBUKÇU, ERDEM; YILMAZLAR, AHMET TUNCAY; EGELİ, ÜNAL; ÇEÇENER, GÜLŞAH; ALEMDAR, ADEM; EVRENSEL, TÜRKKAN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Onkoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Diş Hekimliği Fakültesi/Temel Bilimler Bölümü.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Onkoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Genel Cerrahi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Sağlık Bilimleri Enstitüsü.; 0000-0002-6400-4911; 0000-0002-5956-8755; 0000-0002-1619-6680; 0000-0001-8593-5101; 0000-0001-7904-883X; 0000-0002-3820-424X; HIZ-7332-2022; AAH-1420-2021; AAH-3843-2020; ESM-4544-2022; JDG-0330-2023; ABI-6078-2020; CYM-0930-2022; ETP-1691-2022; CKK-3621-2022; AAP-9988-2020; EXZ-0745-2022Background and Aim: In 10-30% of colorectal cancer (CRC) patients, toxic reactions occur after fluoropyrimidine-based chemotherapy. A dihydropyridine dehydrogenase (DPYD) gene variant, c.1905 + 1G>A, leads to intolerance to fluoropyrimidines. Due to the low frequency of this variant in many populations, the prevalence of fluoropyrimidine-induced hematologic side effects in CRC patients with the c.1905 + 1G>A variant is unclear. In this study, we investigated the prevalence of the DPYD c.1905 + 1 variants in a Turkish CRC cohort and the potential effects of these variants on fluoropyrimidine-induced hematologic side effects.Materials and Methods: The DPYD c.1905 + 1 variant was genotyped using polymerase chain reaction-restriction fragment length polymorphism analysis and confirmed by Sanger sequencing in peripheral blood samples of 100 CRC patients who received fluoropyrimidine-based chemotherapy and 60 healthy volunteers. The association of c.1905 + 1 variants with susceptibility to hematologic side effects was evaluated.Results: The DPYD c.1905 + 1G>A variant was more common in the CRC group than in the healthy control group (p = 0.001). The presence of the c.1905 + 1G>A variant was associated with thrombocytopenia (p = 0.039) and anemia (p = 0.035). CRC patients with fluoropyrimidine-induced anemia had shorter disease-free survival than CRC patients without fluoropyrimidine-induced anemia (p = 0.0009).Conclusions: Before administering fluoropyrimidine-based chemotherapy, genetic screening for the DPYD c.1905 + 1G>A variant should be performed with the aim of preventing anemia and anemia-induced complications in CRC patients.Publication Olea europaea leaf extract suppress stemness-characteristics of gastric cancer via long non-coding rnas(Elsevier Science Inc, 2022-01-04) Tekin, Çağla; Erçelik, Melis; Tezcan, Gülçin; Aksoy, Seçil Ak; Egeli, Ünal; Çeçener, Gülşah; Tunca, Berrin; Tekin, Çağla; Erçelik, Melis; TEZCAN, GÜLÇİN; Aksoy, Seçil Ak; EGELİ, ÜNAL; ÇEÇENER, GÜLŞAH; TUNCA, BERRİN; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Diş Hekimliği Fakültesi/Temel Bilimler Bölümü.; Bursa Uludağ Üniversitesi/İnegöl Meslek Yüksekokulu.; 0000-0002-5956-8755; 0000-0001-7904-883X; 0000-0002-3820-424X; 0000-0002-1619-6680; AAH-3843-2020; AAH-1420-2021; ADM-8457-2022; AAP-9988-2020; ABI-6078-2020; GDC-6329-2022; EUG-3329-2022Introduction: 5-Fluorouracil (5-FU) and Cisplatin (Cis) are insufficient to fight against stem-like cancer cell (CSC)-phenotype Gastric cancer (GC). Therefore, new therapeutic approaches are required to treat CSC-GC patients. Although the anticancer effect of Olea europaea leaf extract (OLE) has been described for multiple types of cancer, including GC, the potential of OLE to be used as a complementary to 5-FU and Cis to treat CSC-GC remains largely unknown. This study uniquely investigated the potential of OLE to be used as complementary to 5-FU-Cis therapy to alleviate the CSC-mediated aggressiveness of GC.Methods: The AGS cells, A GC cell line was treated with OLE-only and its combinations with 5-FU-Cis. Tumor aggressiveness, colony formation, and vascularization were analyzed using tumorsphere and clonogenic assays and ex-vivo analyses. In addition, their effect on the expression of CSC markers, including CD133, OCT4, NANOG, and SOX2 and LncRNA, PVT1, MALAT1, H19, and SNHG16, was investigated using RT-qPCR.Results: OLE-only and involvement of OLE to 5-FU+Cis treatment reduced the size of tumor-spheres (p < 0.0001), number of colonies (p < 0.0001), and vascularization. In addition, the OLE-5-FU-Cis combination decreased mRNA expression levels CSC markers and LncRNA, PVT1, H19, and SNHG16 expression levels compared to 5-FU+Cis (p < 0.05).Conclusion: OLE reduced the survival capacity of CSC phenotype cells by decreasing LncRNA PVT1, MALAT1, and H19 and facilitates the aggressive features of GC cells. Further analysis and validations are required; current findings suggest that OLE could be complementarily used to improve the effect of 5-FU+Cis therapy for GC.Publication NEAT1 Is a novel oncogenic LncRNA and correlated with miR-143 in pediatric oligodendrogliomas(Karger, 2021-03-19) Ak Aksoy, Seçil; Mutlu, Melis; Balçin, Rabia Nur; Taşkapılıoğlu, Mevlut Özgür; Tekin, Çağla; Kaya, Seçkin; Civan, Muhammet Nafi; Kocaeli, Hasan; Bekar, Ahmet; Eser Ocak, Pınar; Çeçener, Gülşah; Egeli, Ünal; Tolunay, Şahsine; Tunca, Berrin; Ak Aksoy, Seçil; Mutlu, Melis; BALÇIN, RABİA NUR; TAŞKAPILIOĞLU, MEVLÜT ÖZGÜR; Tekin, Çağla; KAYA, İSMAİL SEÇKİN; Civan, Muhammet Nafi; KOCAELİ, HASAN; BEKAR, AHMET; Eser Ocak, Pınar; ÇEÇENER, GÜLŞAH; EGELİ, ÜNAL; TOLUNAY, ŞAHSİNE; TUNCA, BERRİN; Bursa Uludağ Üniversitesi/İnegöl Meslek Yüksekokulu.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Beyin Cerrahisi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; 0000-0001-5472-9065; 0000-0002-4256-2250; 0000-0003-0132-9927; 0000-0002-3820-424X; 0000-0001-7904-883X; 0000-0002-1619-6680; ADM-8457-2022; FPB-0403-2022; GXV-3107-2022; AAW-5254-2020; GDC-6329-2022; JGS-1849-2023; HKP-0793-2023; FDK-3229-2022; CGB-7869-2022; AAI-2073-2021; AAP-9988-2020; AAH-1420-2021; AAI-1612-2021; ABI-6078-2020Introduction: The noncoding RNAs (ncRNAs) play a role in biological processes of various cancers including gliomas. The majority of these transcripts are uniquely expressed in differentiated tissues or specific glioma types. Pediatric oligodendroglioma (POG) is a rare subtype of diffuse glioma and accounts for <1% of pediatric brain tumors. Because histologically POG resembles adult OG, the same treatment is applied as adults. However, the significance in predicting outcomes in POG patients is unclear. In this study, we aimed to investigate the prognostic significance of expression -profiles of microRNA (miRNA) and long noncoding RNA -(LncRNA) in POGs. Methods: We investigated the levels of 13 known miRNAs and 6 LncRNAs in tumor samples from 9 patients with primary POG by using RT-PCR and analyzed their association with outcomes. Results: The expression levels of miR-21, miR-106a, miR-10b, and LncRNA NEAT1 were higher, and the expression level of miR-143 was lower in POG tissues compared with normal brain tissues (p = 0.006, p = 0.032, p = 0.034, p = 0.002, and p = 0.001, respectively). High levels of NEAT1 and low expression of miR-143 were associated with decreased probability of short disease-free survival (p = 0.018 and p = 0.022, respectively). Discussion: NEAT1 and miR-143 levels could serve as reciprocal prognostic predictors of disease progression in patients with POG. New treatment models to regulate the expression levels of NEAT1 and miR-143 will bring a new approach to the therapy of POG.Publication The anticancer effect of inula viscosa methanol extract by miRNSs' re-regulation: An in vitro study on human malignant melanoma cells(Taylor, 2021-02-04) Çolak, Dilara Kamer; Egeli, Ünal; Eryılmaz, Işıl Ezgi; Aybastıer, Önder; Malyer, Hulusi; Çeçener, Gülşah; Tunca, Berrin; Çolak, Dilara Kamer; EGELİ, ÜNAL; ERYILMAZ, IŞIL EZGİ; AYBASTIER, ÖNDER; MALYER, HULUSİ; ÇEÇENER, GÜLŞAH; TUNCA, BERRİN; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Tıbbi Biyoloji Bölümü; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Analitik Kimya Bölümü; 0000-0001-7904-883X; 0000-0002-0380-1992; 0000-0002-3820-424X; 0000-0002-1619-6680; 0000-0002-3316-316X; GWV-3548-2022; AAH-1420-2021; HXB-1173-2023; X-4621-2018; DDS-8738-2022; AAP-9988-2020; ABI-6078-2020Alternative and natural therapies are needed for malignant melanoma (MM), the most deadly skin cancer type due to chemotherapy's limited effect. In the present study, we evaluated the anticancer potentials of Inula viscosa methanol and water extracts (IVM and IVW) on MM cells, A2058 and MeWo, and normal fibroblasts. After the chromatographic and antioxidant activity analysis, their antiproliferative effects were determined with the increasing doses for 24-72 h. IVM induced more cell death in a dose and time-dependent manner in MM cells compared to IVW. This effect was probably due to the higher amount of phenolics in it. IVM significantly induced more apoptotic death in MM cells than fibroblasts (p < 0.01), which was also supported morphologically. IVM also caused cell cycle arrest at G0/G1 and G2/M phases in A2058 and MeWo, respectively, and suppressed the migration ability of MM cells (p < 0.01). Additionally, IVM was found to have significant potential in regulating MM-related miRNAs, upregulating miR-579 and miR-524, and downregulating miR-191 and miR-193, in MM cells (p < 0.05, p < 0.01). As a result, the anticancer effect of IVM via regulating miRNAs' expression has been demonstrated for the first time. Thus, IVM, with these potentials, may be a promising candidate for MM treatment.Publication Investigation of biodegradability and cellular activity of PCL/PLA and PCL/PLLA electrospun webs for tissue engineering applications(Wiley, 2023-07-25) Öztemur, Janset; Özdemir, Suzan; Tezcan-Ünlü, Havva; Çeçener, Gülşah; Sezgin, Hande; Yalçın-Enis, İpek; Tezcan-Ünlu, Havva; ÇEÇENER, GÜLŞAH; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; AAP-9988-2020; GYU-0252-2022Biodegradability and cellular activity are key performance indicators that should be prioritized for tissue engineering applications. Biopolymer selection, determination of necessary structural properties, and their synergistic interactions play an active role in obtaining the expected biodegradability and biological activity from scaffolds. In this study, it is aimed to produce electrospun webs with improved biocompatibility by blending polycaprolactone (PCL) with polylactic acid (PLA) and poly-l-lactide (PLLA), and examine the effect of biopolymer selection and blend ratio on the biodegradability and cellular activity of surfaces. In this context, fibrous webs are produced from PCL/PLA and PCL/PLLA blends with a weight ratio of 80/20 and 50/50 and pure polymers of PCL, PLA, and PLLA by electrospinning method and subjected to morphological and biological analyses. The biodegradation tests are carried out hydrolytically while the cell viability and cell proliferation analyses are performed with adult human primary dermal fibroblasts and human umbilical endothelial cells (HUVECs). The results show that the fiber diameters of the fabricated webs ranged from 0.747 to 1.685 mu m. At the end of the 5th month, it is observed that the biodegradation rates of the webs blended 50% with PLA and PLLA, in comparison to PCL ones, increase from 3.7% to 13.33% and 7.69%, respectively. On the other hand, cell culture results highlight that the addition of 20% PLA and PLLA improves the cellular activity of both cell types, but increased PLA or PLLA ratio in PCL webs has a negative effect as it makes the structure stiff and brittle.Publication The expression and prognostic value of miR-146a and miR-155 in Turkish patients with multiple sclerosis(Taylor & Francis, 2022-03-04) Sarıdaş, Furkan; Ünlü, Havva Tezcan; Çeçener, Gülşah; Egeli, Ünal; Takanlou, Maryam Sabour; Takanlou, Leila Sabour; Tunca, Berrin; Zarifoğlu, Mehmet; Turan, Ömer Faruk; Taşkapılıoğlu, Özlem; SARIDAŞ, FURKAN; ÇEÇENER, GÜLŞAH; EGELİ, ÜNAL; TUNCA, BERRİN; ZARİFOĞLU, MEHMET; TURAN, ÖMER FARUK; Takanlou, Maryam Sabour; Takanlou, Leila Sabour; Taşkapılıoğlu, Özlem; 0000-0001-5945-2317; 0000-0002-0910-4258; 0000-0002-3820-424X; 0000-0001-7904-883X; 0000-0002-1590-4833; 0000-0002-6361-7150; 0000-0002-1619-6680; HSB-2700-2023; GYU-0252-2022; AAP-9988-2020; AAH-1420-2021; KGL-6846-2024; GRE-6268-2022; ABI-6078-2020; EHN-5825-2022; JDI-6091-2023; EBA-4926-2022Multiple sclerosis (MS) is an inflammatory, autoimmune demyelinating, and neurodegenerative disorder of the central nervous system. Interactions between environmental factors, predisposition genes, and determining genes appear to be involved in its etiology. Epigenetic mechanisms such as microRNA-mediated gene regulation can determine the susceptibility and severity of autoimmune diseases. Therefore, to determine the role of miR-146a and miR-155 in MS and its developmental stages, the expression levels in the serum of MS and clinically isolated syndrome (CIS) patients were compared with those of healthy controls. In the present study, the expression levels of miR-146a and miR-155 were assessed using quantitative Real-Time PCR in blood samples of 15 CIS patients and 61 relapsing-remitting multiple sclerosis (RRMS) patients alongside 32 healthy patients as controls. Furthermore, any associations with the clinicopathologic variables of the patients were also evaluated. Dysregulations were found only in the miR-146a and miR-155 expressions in the RRMS-Control group. When the RRMS patients were evaluated in terms of the characteristics of sex, annual attack rate, age of diagnosis, duration of follow-up, and immunomodulatory treatments used, no significant differences were observed. However, significant dysregulations were identified in miRNA expression in the vitamin D level, EDSS values, and the number of attacks. ROC curve analysis showed that miR-146a and miR-155 were significant in the RRMS-Control group for the area under the curve (AUC). It is possible that miR-146a may be associated with vitamin D deficiency and disease disability, while miR-155 may be associated with the number of attacks.Publication Investigation of apc mutations of a patient with fap and her family members by heterodublex analyses(Nature Publishing Group, 2002-05-01) Menigatti, M; Benatti, P; Pedroni, M; Scarselli, A; Borghi, F; Sala, E; Yerci, O; de Leon, MP; TUNCA, BERRİN; Çeçener, Gülşah; YILMAZLAR, AHMET TUNCAY; ÇEÇENER, GÜLŞAH; Yılmazlar, Tuncay; Zorluoglu, A; EGELİ, ÜNAL; Yerci, Ömer; YERCİ, ÖMER; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Patoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Genel Cerrahi Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Medikal Biyoloji ve Genetik Anabilim Dalı.; 0000-0002-1619-6680; 0000-0002-3820-424X; 0000-0001-7904-883X; AAH-1420-2021; ABI-6078-2020Publication The role of the dopamine β-hydroxylase functional polymorphism in patients with early-onset parkinson's disease in the Turkish population(Turkish Neurological Soc, 2021-03-01) Erer, Sevda; Eryılmaz, Işıl Ezgi; Çolak, Dilara Kamer; Egeli, Ünal; Çeçener, Gülşah; Tunca, Berrin; Karakuş, Ece; Çolakoğlu, Beril; Tokçaer, Ayşe Bora; Saka, Esen; Demirkıran, Meltem; Akbostancı, Cenk; Zarifoğlu, Mehmet; Doğu, Okan; Kaleagasi, Hakan; Kenangil, Gülay; Çakmur, Raif; Elibol, Bülent; ERER ÖZBEK, ÇİĞDEM SEVDA; ERYILMAZ, IŞIL EZGİ; Çolak, Dilara Kamer; EGELİ, ÜNAL; ÇEÇENER, GÜLŞAH; TUNCA, BERRİN; Karakuş, Ece; ZARİFOĞLU, MEHMET; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Nöroloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Biyoloji Anabilim Dalı.; Bursa Uludağ Üniversitesi/Tıp Fakültesi.; 0000-0001-7904-883X; 0000-0002-3316-316X; 0000-0002-2274-3230; 0000-0003-4968-2826; 0000-0002-3820-424X; 0000-0002-1619-6680; 0000-0003-2982-0961; GWV-3548-2022; AAH-1420-2021; DVY-9744-2022; JIP-4494-2023; AAP-9988-2020; ABI-6078-2020; FDA-2023-2022; EHN-5825-2022Objective: A functional single nucleotide polymorphism, rs1611115, in the dopamine beta-hydroxylase (DBH) gene, is reported to regulate plasma enzyme activity levels. Mere, we report the first evaluation of this association in patients with early-onset Parkinson's disease (EOPD) and healthy controls in the Turkish population.Materials and Methods: We evaluated the DBH rs1611115 polymorphism in 114 (64 male and 50 female) Turkish patients with EOPD and 58 sex- and age-matched healthy controls from the Turkish population. A total of 27.2% (n=31) of our patients who had any variation including pathogenic or non-pathogenic missense, non-sense and/or intronic variation with unknown significance in EOPD genes were grouped as "variation-positive EOPD". A total of 50.8% (n=58) of our patients were grouped as "variation and family history-negative EOPD" and the possible contribution of the DBH rs1611115 polymorphism to EOPD pathogenesis was evaluated in this group.Results: There was no significant difference in the genotypic and allelic frequencies of DBH rs1611115 between patients with EOPD and controls. To our knowledge, this is the first evaluation of the DBH rs1611115 polymorphism in patients with EOPD and ethnically matched controls in the Turkish population.Conclusion: Some previous studies have reported conflicting association results between DBH rs1611115 polymorphism and PD pathogenesis in different ethnic groups. Therefore, further studies are needed to evaluate dopamine metabolism-related generic variants and to determine their possible roles in EOPD susceptibility in the Turkish population.