Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Review of the Relationship Between Growth Hormone and SARS-CoV-2 Infection(Taylor & Francis Ltd, 2025) Rasmi, Yousef; Kirboga, Kevser Kubra; Roshanravan, Neda; Tekin, Burcu; Jalali, Ladan; Ghazizadeh, FaridRecent evidence suggests that SARS-CoV-2 is associated with the endocrine system, particularly growth hormone (GH). GH modifies immune responses and its deficiency could be responsible for the uncontrolled immunity that occurs in severe cases of COVID-19. Recent research shows that patients suffering from lung complications have significantly lower levels of GH and insulin-like growth factor-1 (IGF-1), which are proportionate to the severity of the disease. This relationship supports the hypothesis that GH regulates the immunity and inflammatory processes of the SARS-CoV-2 virus. However, variables such as age, gender, and comorbidities, such as diabetes and obesity, which are associated with lower GH levels, are strong predictors of COVID-19 outcomes. Older individuals and men, who tend to have lower GH levels, are disproportionately represented among severely ill patients. The available evidence suggests that GH supplementation therapy should be evaluated as a supportive measure to reduce the severity of the disease in high-risk individuals. The main goal of the research is to understand how COVID-19 is related to GH so that researchers can identify new mechanisms of pathology and develop better solutions for patients.Article Citation - WoS: 11Citation - Scopus: 10Molecular Evolution and Population Genetics of Glutamate Decarboxylase Acid Resistance Pathway in Lactic Acid Bacteria(Frontiers Media S.A., 2023) Sezgin, Efe; Tekin, BurcuGlutamate decarboxylase (GAD) pathway (GDP) is a major acid resistance mechanism enabling microorganisms’ survival in low pH environments. We aimed to study the molecular evolution and population genetics of GDP in Lactic Acid Bacteria (LAB) to understand evolutionary processes shaping adaptation to acidic environments comparing species where the GDP genes are organized in an operon structure (Levilactobacillus brevis) versus lack of an operon structure (Lactiplantibacillus plantarum). Within species molecular population genetic analyses of GDP genes in L. brevis and L. plantarum sampled from diverse fermented food and other environments showed abundant synonymous and non-synonymous nucleotide diversity, mostly driven by low frequency changes, distributed throughout the coding regions for all genes in both species. GAD genes showed higher level of replacement polymorphism compared to transporter genes (gadC and YjeM) for both species, and GAD genes that are outside of an operon structure showed even higher level of replacement polymorphism. Population genetic tests suggest negative selection against replacement changes in all genes. Molecular structure and amino acid characteristics analyses showed that in none of the GDP genes replacement changes alter 3D structure or charge distribution supporting negative selection against non-conservative amino acid changes. Phylogenetic and between species divergence analyses suggested adaptive protein evolution on GDP genes comparing phylogenetically distant species, but conservative evolution comparing closely related species. GDP genes within an operon structure showed slower molecular evolution and higher conservation. All GAD and transporter genes showed high codon usage bias in examined LAB species suggesting high expression and utilization of acid resistance genes. Substantial discordances between species, GAD, and transporter gene tree topologies were observed suggesting molecular evolution of GDP genes do not follow speciation events. Distribution of operon structure on the species tree suggested multiple independent gain or loss of operon structure in LABs. In conclusion, GDP genes in LABs exhibit a dynamic molecular evolutionary history shaped by gene loss, gene transfer, negative and positive selection to maintain its active role in acid resistance mechanism, and enable organisms to thrive in acidic environments.Article Citation - WoS: 11Citation - Scopus: 11The Importance of Neopterin in Covid-19: The Prognostic Value and Relation With the Disease Severity(Elsevier, 2022) Rasmi, Yousef; Heidari, Nadia; Kübra Kırboğa, Kevser; Hatamkhani, Shima; Tekin, Burcu; Alipour, Shahryar; Naderi, Roya; Farnamian, Yeghaneh; Akça, İlknurCoronavirus Disease 2019 [COVID-19], caused by severe acute respiratory syndrome coronavirus 2 [SARS-CoV-2], has rapidly evolved into a global health emergency. Neopterin [NPT], produced by macrophages when stimulated with interferon [IFN-]gamma, is an essential cytokine in the antiviral immune response. NPT has been used as a marker for the early assessment of disease severity in different diseases. The leading cause of NPT production is the pro-inflammatory cytokine IFN-. Macrophage activation has also been revealed to be linked with disease severity in SARS-CoV-2 patients. We demonstrate the importance of NPT in the pathogenesis of SARS-CoV-2 and suggest that targeting NPT in SARS-CoV-2 infection may be critical in the early prediction of disease progression and provision of timely management of infected individuals.