Reyhan Caliskan

Prof. Dr. Reyhan Caliskan

orcid

Research Focus & Metrics

Academic Career Length

11Years (2016-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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16 December 2022 in Bezmialem Science
Verified
Journal Article
Closed access
RÇReyhan Çalışkan
Reyhan Çalışkan
SSSilva Polat Sarı
Silva Polat Sarı
BABetül Büyükkiliç Altinbaşak
Betül Büyükkiliç Altinbaşak
HDHarika Öykü Dinç
Harika Öykü Dinç
ABAleyna Balekoğlu
Aleyna Balekoğlu
PMPelin Yüksel Mayda
Pelin Yüksel Mayda

1 October 2022 in Bezmialem Science
Verified
Journal Article
Closed access
SSSilva Polat Sarı
Silva Polat Sarı
HDHarika Öykü Di̇nç
Harika Öykü Di̇nç
BABetül Büyükkiliç Altinbaşak
Betül Büyükkiliç Altinbaşak
PMPelin Yüksel Mayda
Pelin Yüksel Mayda
ÖAÖzer Akgül
Özer Akgül
RÇReyhan Çalışkan
Reyhan Çalışkan

1 May 2016 in Travel Medicine and Infectious Disease
Verified
Journal Article
Closed access
BKBekir Kocazeybek
Bekir Kocazeybek
PYPelin Yuksel
Pelin Yuksel
DKDilek Keskin
Dilek Keskin
SSSuhail Sheikh
Suhail Sheikh
ZHZafer Habip
Zafer Habip
HThrisi bahar tokman
hrisi bahar tokman

7 September 2025 in Journal of Fungi
Verified
Journal Article
Open access
PDF file
ZYZeynep Yazgan
Zeynep Yazgan
RÇReyhan Çalışkan
Reyhan Çalışkan
GAGökhan Aygün
Gökhan Aygün
Azole-resistant mycotic infections pose an escalating global health threat, with an estimated 6.5 million invasive fungal infections (IFIs) annually leading to 3.8 million deaths, 68% directly caused by IFIs. While azole antifungals are the cornerstone of treatment, emerging resistance, mainly due to gene mutations and efflux pump overexpression, is a major concern. This study, spanning 2015–2023, investigated azole resistance in clinical Aspergillus isolates in Turkey, a region lacking comprehensive surveillance. Of 200 causative isolates, A. fumigatus accounted for 45% and respiratory samples 57%. Overall azole resistance was 7%, rising to 11% for A. fumigatus. Findings highlight the persistent challenge of azole resistance, emphasizing the critical need for continued local and global surveillance to inform treatment guidelines and public health interventions. Despite limitations, including a single-center focus, this research provides crucial epidemiological insights into the evolving landscape of antifungal resistance in Turkey.

27 November 2022 in Medicina
Verified
Journal Article
Open access
PDF file
RÇReyhan Çalışkan
Reyhan Çalışkan
SSSilva Polat Sarı
Silva Polat Sarı
BEBahadir ERCAN
Bahadir ERCAN
KPKivanc Derya Peker
Kivanc Derya Peker
MSMehtap Omac Sönmez
Mehtap Omac Sönmez
PMPelin Yuksel Mayda
Pelin Yuksel Mayda
Background and Objectives: Helicobacter pylori infection is associated with chronic gastritis, ulcers, and gastric cancer. The H. pylori Type 4 secretion system (T4SS) translocates the CagA protein into host cells and plays an essential role in initiating gastric carcinogenesis. The CagL protein is a component of the T4SS. CagL amino acid polymorphisms are correlated with clinical outcomes. We aimed to study the association between CagL amino acid polymorphisms and peptic ulcer disease (PUD) and non-ulcer dyspepsia (NUD). Materials and Methods: A total of 99 patients (PUD, 46; NUD, 53) were enrolled and screened for H. pylori by qPCR from antrum biopsy samples. The amino acid polymorphisms of CagL were analyzed using DNA sequencing, followed by the MAFFT sequence alignment program to match the amino acid sequences. Results: Antrum biopsy samples from 70 out of 99 (70.7%) patients were found to be H. pylori DNA-positive. A positive band for cagL was detected in 42 out of 70 samples (PUD, 23; NUD, 19), and following this, these 42 samples were sequenced. In total, 27 different polymorphisms were determined. We determined three CagL amino acid polymorphism combinations, which were determined to be associated with PUD and NUD. Pattern 1 (K35/N122/V134/T175/R194/E210) was only detected in PUD patient samples and was related to a 1.35-fold risk (p = 0.02). Patterns 2 (V41/I134) and 3 (V41/K122/A171/I174) were found only in NUD patient samples and were linked to a 1.26-fold increased risk (p = 0.03). Conclusions: We observed three new patterns associated with PUD and NUD. Pattern 1 is related to PUD, and the other two patterns (Patterns 2 and 3) are related to NUD. The patterns that we identified include the remote polymorphisms of the CagL protein, which is a new approach. These patterns may help to understand the course of H. pylori infection.

24 September 2025 in Journal of Clinical Medicine
Verified
Journal Article
Open access
PDF file
ÖAÖzer Akgül
Özer Akgül
ÖDÖmer Faruk Demirel
Ömer Faruk Demirel
ITIlker Tosun
Ilker Tosun
YKYasin Kavla
Yasin Kavla
MKMehmet Murat Kirpinar
Mehmet Murat Kirpinar
YÖYaşar Ali Öner
Yaşar Ali Öner
Background/Objectives: Schizophrenia (SCH), bipolar disorder (BPD), and major depressive disorder (MDD) are increasingly viewed as neuroimmune disorders shaped by viral exposure and inflammation. Disorder-specific immunovirological profiles, however, remain poorly defined. Methods: In this cross-sectional study, we assessed Epstein–Barr Virus (EBV) and Herpes Simplex Virus type 1 (HSV-1) seropositivity and measured serum CRP, IL-6, and IL-1β in 708 participants: 110 with SCH, 121 with BPD, 135 with MDD, and 342 healthy controls (HC). Statistical analyses included Shapiro–Wilk tests for normality; Kruskal–Wallis with Bonferroni-adjusted Dunn post hoc comparisons; and logistic regression adjusted for age, sex, and marital status. Results: EBV seropositivity was higher in SCH (90.9%) than in HC (78.9%) (OR = 3.46, 95% CI: 1.68–7.12; p = 0.001) but not in BPD or MDD. HSV-1 seropositivity was elevated in BPD (83.5%) versus HC (67.0%) (OR = 2.29, 95% CI: 1.34–3.92; p = 0.003), with no differences in SCH or MDD. Inflammatory biomarkers were significantly increased in SCH and MDD compared to HC (p < 0.001), while BPD showed no differences. Conclusions: The findings delineate distinct immunovirological patterns across major psychiatric disorders. Schizophrenia was characterized by EBV seropositivity accompanied by systemic inflammatory activation, bipolar disorder by HSV-1 seropositivity in the absence of inflammatory changes, and major depressive disorder by inflammatory dysregulation independent of viral exposure. These disorder-specific profiles highlight heterogeneity in neuroimmune pathways and underscore the potential relevance of biomarker-based stratification for generating hypotheses regarding targeted antiviral or anti-inflammatory interventions in psychiatric populations.