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Surme S, Ergun C, Gul S, Akyel YK, Gul ZM, Ozcan O, Ipek OS, Akarlar BA, Ozlu N, Taskin AC, Turkay M, Gören AC, Baris I, Ozturk N, Guzel M, Aydin C, Okyar A, Kavakli IH. TW68, cryptochromes stabilizer, regulates fasting blood glucose levels in diabetic ob/ob and high fat-diet-induced obese mice. Biochem Pharmacol 2023; 218:115896. [PMID: 37898388 DOI: 10.1016/j.bcp.2023.115896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 10/24/2023] [Accepted: 10/25/2023] [Indexed: 10/30/2023]
Abstract
Cryptochromes (CRYs), transcriptional repressors of the circadian clock in mammals, inhibit cAMP production when glucagon activates G-protein coupled receptors. Therefore, molecules that modulate CRYs have the potential to regulate gluconeogenesis. In this study, we discovered a new molecule called TW68 that interacts with the primary pockets of mammalian CRY1/2, leading to reduced ubiquitination levels and increased stability. In cell-based circadian rhythm assays using U2OS Bmal1-dLuc cells, TW68 extended the period length of the circadian rhythm. Additionally, TW68 decreased the transcriptional levels of two genes, Phosphoenolpyruvate carboxykinase 1 (PCK1) and Glucose-6-phosphatase (G6PC), which play crucial roles in glucose biosynthesis during glucagon-induced gluconeogenesis in HepG2 cells. Oral administration of TW68 in mice showed good tolerance, a good pharmacokinetic profile, and remarkable bioavailability. Finally, when administered to fasting diabetic animals from ob/ob and HFD-fed obese mice, TW68 reduced blood glucose levels by enhancing CRY stabilization and subsequently decreasing the transcriptional levels of Pck1 and G6pc. These findings collectively demonstrate the antidiabetic efficacy of TW68 in vivo, suggesting its therapeutic potential for controlling fasting glucose levels in the treatment of type 2 diabetes mellitus.
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Affiliation(s)
- Saliha Surme
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Cagla Ergun
- Department of Chemical and Biological Engineering, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Seref Gul
- Istanbul University, Department of Biology, Biotechnology Division, TR-34116 Beyazit-İstanbul, Türkiye; Current address: Bezmialem Vakif University, Institute of Life Sciences and Biotechnology, Beykoz, Istanbul, Türkiye
| | - Yasemin Kubra Akyel
- Istanbul Medipol University, School of Medicine, Department of Medical Pharmacology, İstanbul, Türkiye; Istanbul University, Faculty of Pharmacy Department of Pharmacology, TR-34116 Beyazit-İstanbul, Türkiye
| | - Zeynep Melis Gul
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Onur Ozcan
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Ozgecan Savlug Ipek
- Istanbul Medipol University, Regenerative and Restorative Medicine Research Center (REMER), Kavacik Campus, Kavacik-Beykoz/İstanbul 34810, Türkiye
| | - Busra Aytul Akarlar
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Nurhan Ozlu
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Ali Cihan Taskin
- Department of Laboratory Animal Science, Aziz Sancar Institute of Experimental Medicine, Istanbul University, Istanbul, Türkiye
| | - Metin Turkay
- Department of Industrial Engineering, Koc University, Rumelifeneri Yolu, İstanbul, Türkiye
| | - Ahmet Ceyhan Gören
- Gebze Technical University, Department of Chemistry, Gebze, Kocaeli, Türkiye
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye
| | - Nuri Ozturk
- Gebze Technical University, Department of Molecular Biology and Genetics, Gebze, Kocaeli, Türkiye
| | - Mustafa Guzel
- Istanbul Medipol University, Regenerative and Restorative Medicine Research Center (REMER), Kavacik Campus, Kavacik-Beykoz/İstanbul 34810, Türkiye
| | - Cihan Aydin
- Department of Molecular Biology and Genetics, Istanbul Medeniyet University, Istanbul, Türkiye
| | - Alper Okyar
- Istanbul University, Faculty of Pharmacy Department of Pharmacology, TR-34116 Beyazit-İstanbul, Türkiye
| | - Ibrahim Halil Kavakli
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye; Department of Chemical and Biological Engineering, Koc University, Rumelifeneri Yolu, Istanbul, Türkiye.
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Parlak GC, Baris I, Gul S, Kavakli IH. Functional characterization of the CRY2 circadian clock component variant p.Ser420Phe revealed a new degradation pathway for CRY2. J Biol Chem 2023; 299:105451. [PMID: 37951306 PMCID: PMC10731238 DOI: 10.1016/j.jbc.2023.105451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/25/2023] [Accepted: 10/27/2023] [Indexed: 11/13/2023] Open
Abstract
Cryptochromes (CRYs) are essential components of the circadian clock, playing a pivotal role as transcriptional repressors. Despite their significance, the precise mechanisms underlying CRYs' involvement in the circadian clock remain incompletely understood. In this study, we identified a rare CRY2 variant, p.Ser420Phe, from the 1000 Genomes Project and Ensembl database that is located in the functionally important coiled-coil-like helix (CC-helix) region. Functional characterization of this variant at the cellular level revealed that p.Ser420Phe CRY2 had reduced repression activity on CLOCK:BMAL1-driven transcription due to its reduced affinity to the core clock protein PER2 and defective translocation into the nucleus. Intriguingly, the CRY2 variant exhibited an unexpected resistance to degradation via the canonical proteasomal pathway, primarily due to the loss of interactions with E3 ligases (FBXL3 and FBXL21), which suggests Ser-420 of CRY2 is required for the interaction with E3 ligases. Further studies revealed that wild-type and CRY2 variants are degraded by the lysosomal-mediated degradation pathway, a mechanism not previously associated with CRY2. Surprisingly, our complementation study with Cry1-/-Cry2-/- double knockout mouse embryonic fibroblast cells indicated that the CRY2 variant caused a 7 h shorter circadian period length in contrast to the observed prolonged period length in CRY2-/- cell lines. In summary, this study reveals a hitherto unknown degradation pathway for CRY2, shedding new light on the regulation of circadian rhythm period length.
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Affiliation(s)
- Gizem Cagla Parlak
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkiye
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkiye
| | - Seref Gul
- Institute of Life Sciences and Biotechnology, Bezmialem Vakif University, Beykoz, Turkiye
| | - Ibrahim Halil Kavakli
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkiye; Department of Chemical and Biological Engineering, Koc University, Istanbul, Turkiye.
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3
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Baris I, Ozcan O, Kavakli IH. Single nucleotide polymorphisms (SNPs) in circadian genes: Impact on gene function and phenotype. Adv Protein Chem Struct Biol 2023; 137:17-37. [PMID: 37709375 DOI: 10.1016/bs.apcsb.2023.03.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
Abstract
Circadian rhythm is an endogenous timing system that allows an organism to anticipate and adapt to daily changes and regulate various physiological variables such as the sleep-wake cycle. This rhythm is governed by a molecular circadian clock mechanism, generated by a transcriptional and translational feedback loop (TTFL) mechanism. In mammals, TTFL is determined by the interaction of four main clock proteins: BMAL1, CLOCK, Cryptochromes (CRY), and Periods (PER). BMAL1 and CLOCK form dimers and initiate the transcription of clock-controlled genes (CCG) by binding an E-box element with the promotor genes. Among CCGs, PERs and CRYs accumulate in the cytosol and translocate into the nucleus, where they interact with the BMAL1/CLOCK dimer and inhibit its activity. Several epidemiological and genetic studies have revealed that circadian rhythm disruption causes various types of disease. In this chapter, we summarize the effect of core clock gene SNPs on circadian rhythm and diseases in humans.
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Affiliation(s)
- Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Türkiye
| | - Onur Ozcan
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Türkiye
| | - Ibrahim Halil Kavakli
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Türkiye; Department of Chemical and Biological Engineering, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Türkiye.
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4
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Parlak GC, Camur BB, Gul S, Ozcan O, Baris I, Kavakli IH. The secondary pocket of Cryptochrome 2 is important for the regulation of its stability and localization. J Biol Chem 2022; 298:102334. [PMID: 35933018 PMCID: PMC9442382 DOI: 10.1016/j.jbc.2022.102334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 07/13/2022] [Accepted: 07/15/2022] [Indexed: 11/28/2022] Open
Abstract
Human clock-gene variations contribute to the phenotypic differences observed in various behavioral and physiological processes such as diurnal preference, sleep, metabolism, mood regulation, addiction, and fertility. However, little is known about the possible effects of identified variations at the molecular level. In this study, we performed a functional characterization at the cellular level of rare CRYPTOCHROME 2 (CRY2) missense variations that were identified from the Ensembl database. Our structural studies revealed that three variations (p.Pro123Leu, p.Asp406His, p.Ser410Ile) are located at the rim of the secondary pocket of CRY2. We show these variants were unable to repress CLOCK/BMAL1-driven transcription in a cell-based reporter assay and had reduced affinity to CLOCK/BMAL1. Furthermore, our biochemical studies indicated that the variants were less stable than the wild-type CRY2, which could be rescued in the presence of Period 2 (PER2), another core clock protein. Finally, we found these variants were unable to properly localize to the nucleus, and thereby were unable to rescue the circadian rhythm in a Cry1-/-Cry2-/- double-knockout mouse embryonic fibroblast cell line. Collectively, our data suggest that the rim of the secondary pocket of CRY2 plays a significant role in its nuclear localization independently of PER2 and in the intact circadian rhythm at the cellular level.
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Affiliation(s)
- Gizem Cagla Parlak
- Koc university Department Molecular Biology and Genetics, Rumeli Feneri Yolu, Sariyer, Istanbul, Turkey
| | - Bilge Bahar Camur
- Koc university Department Molecular Biology and Genetics, Rumeli Feneri Yolu, Sariyer, Istanbul, Turkey
| | - Seref Gul
- Istanbul University, Department of Biology, Biotechnology Division, 34134 Suleymaniye, Istanbul, Turkey
| | - Onur Ozcan
- Koc university Department Molecular Biology and Genetics, Rumeli Feneri Yolu, Sariyer, Istanbul, Turkey
| | - Ibrahim Baris
- Koc university Department Molecular Biology and Genetics, Rumeli Feneri Yolu, Sariyer, Istanbul, Turkey
| | - Ibrahim Halil Kavakli
- Koc university Department Molecular Biology and Genetics, Rumeli Feneri Yolu, Sariyer, Istanbul, Turkey; Koc university Department Chemical and Biological Engineering, Rumeli Feneri Yolu, Sariyer, Istanbul, Turkey.
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Gul S, Aydin C, Ozcan O, Gurkan B, Surme S, Baris I, Kavakli IH. The Arg-293 of Cryptochrome1 is responsible for the allosteric regulation of CLOCK-CRY1 binding in circadian rhythm. J Biol Chem 2020; 295:17187-17199. [PMID: 33028638 PMCID: PMC7863883 DOI: 10.1074/jbc.ra120.014333] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 10/01/2020] [Indexed: 11/06/2022] Open
Abstract
Mammalian circadian clocks are driven by transcription/translation feedback loops composed of positive transcriptional activators (BMAL1 and CLOCK) and negative repressors (CRYPTOCHROMEs (CRYs) and PERIODs (PERs)). CRYs, in complex with PERs, bind to the BMAL1/CLOCK complex and repress E-box-driven transcription of clock-associated genes. There are two individual CRYs, with CRY1 exhibiting higher affinity to the BMAL1/CLOCK complex than CRY2. It is known that this differential binding is regulated by a dynamic serine-rich loop adjacent to the secondary pocket of both CRYs, but the underlying features controlling loop dynamics are not known. Here we report that allosteric regulation of the serine-rich loop is mediated by Arg-293 of CRY1, identified as a rare CRY1 SNP in the Ensembl and 1000 Genomes databases. The p.Arg293His CRY1 variant caused a shortened circadian period in a Cry1-/-Cry2-/- double knockout mouse embryonic fibroblast cell line. Moreover, the variant displayed reduced repressor activity on BMAL1/CLOCK driven transcription, which is explained by reduced affinity to BMAL1/CLOCK in the absence of PER2 compared with CRY1. Molecular dynamics simulations revealed that the p.Arg293His CRY1 variant altered a communication pathway between Arg-293 and the serine loop by reducing its dynamicity. Collectively, this study provides direct evidence that allosterism in CRY1 is critical for the regulation of circadian rhythm.
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Affiliation(s)
- Seref Gul
- Department of Chemical and Biological Engineering, Koc University, Istanbul, Turkey
| | - Cihan Aydin
- Department of Molecular Biology and Genetics, Istanbul Medeniyet University, Istanbul, Turkey
| | - Onur Ozcan
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey
| | - Berke Gurkan
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey
| | - Saliha Surme
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey
| | - Ibrahim Halil Kavakli
- Department of Chemical and Biological Engineering, Koc University, Istanbul, Turkey; Department of Molecular Biology and Genetics, Koc University, Istanbul, Turkey.
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Doruk YU, Yarparvar D, Akyel YK, Gul S, Taskin AC, Yilmaz F, Baris I, Ozturk N, Türkay M, Ozturk N, Okyar A, Kavakli IH. A CLOCK-binding small molecule disrupts the interaction between CLOCK and BMAL1 and enhances circadian rhythm amplitude. J Biol Chem 2020; 295:3518-3531. [PMID: 32019867 DOI: 10.1074/jbc.ra119.011332] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 01/28/2020] [Indexed: 12/31/2022] Open
Abstract
Proper function of many physiological processes requires a robust circadian clock. Disruptions of the circadian clock can result in metabolic diseases, mood disorders, and accelerated aging. Therefore, identifying small molecules that specifically modulate regulatory core clock proteins may potentially enable better management of these disorders. In this study, we applied a structure-based molecular-docking approach to find small molecules that specifically bind to the core circadian regulator, the transcription factor circadian locomotor output cycles kaput (CLOCK). We identified 100 candidate molecules by virtual screening of ∼2 million small molecules for those predicted to bind closely to the interface in CLOCK that interacts with its transcriptional co-regulator, Brain and muscle Arnt-like protein-1 (BMAL1). Using a mammalian two-hybrid system, real-time monitoring of circadian rhythm in U2OS cells, and various biochemical assays, we tested these compounds experimentally and found one, named CLK8, that specifically bound to and interfered with CLOCK activity. We show that CLK8 disrupts the interaction between CLOCK and BMAL1 and interferes with nuclear translocation of CLOCK both in vivo and in vitro Results from further experiments indicated that CLK8 enhances the amplitude of the cellular circadian rhythm by stabilizing the negative arm of the transcription/translation feedback loop without affecting period length. Our results reveal CLK8 as a tool for further studies of CLOCK's role in circadian rhythm amplitude regulation and as a potential candidate for therapeutic development to manage disorders associated with dampened circadian rhythms.
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Affiliation(s)
- Yagmur Umay Doruk
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Darya Yarparvar
- Department of Chemical and Biological Engineering, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Yasemin Kubra Akyel
- Department of Pharmacology, Istanbul University Faculty of Pharmacy, TR-34116 Beyazit, Istanbul, Turkey
| | - Seref Gul
- Department of Chemical and Biological Engineering, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Ali Cihan Taskin
- Embryo Manipulation Laboratory, Animal Research Facility, Research Center For Translational Medicine, Koc University, Rumelifeneri yolu, Sariyer, Istanbul, Turkey
| | - Fatma Yilmaz
- Department of Molecular Biology and Genetics, Gebze Technical University, Gebze, Kocaeli, Turkey
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Nuri Ozturk
- Department of Molecular Biology and Genetics, Gebze Technical University, Gebze, Kocaeli, Turkey
| | - Metin Türkay
- Department of Industrial Engineering, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Narin Ozturk
- Department of Pharmacology, Istanbul University Faculty of Pharmacy, TR-34116 Beyazit, Istanbul, Turkey
| | - Alper Okyar
- Department of Pharmacology, Istanbul University Faculty of Pharmacy, TR-34116 Beyazit, Istanbul, Turkey
| | - Ibrahim Halil Kavakli
- Department of Molecular Biology and Genetics, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey; Department of Chemical and Biological Engineering, Koc University, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey.
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Dikbas UM, Tardu M, Canturk A, Gul S, Ozcelik G, Baris I, Ozturk N, Kavakli IH. Identification and Characterization of a New Class of (6-4) Photolyase from Vibrio cholerae. Biochemistry 2019; 58:4352-4360. [PMID: 31578858 DOI: 10.1021/acs.biochem.9b00766] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Light is crucial for many biological activities of most organisms, including vision, resetting of circadian rhythm, photosynthesis, and DNA repair. The cryptochrome/photolyase family (CPF) represents an ancient group of UV-A/blue light sensitive proteins that perform different functions such as DNA repair, circadian photoreception, and transcriptional regulation. The CPF is widely distributed throughout all organisms, including marine prokaryotes. The bacterium Vibrio cholerae was previously shown to have a CPD photolyase that repairs UV-induced thymine dimers and two CRY-DASHs that repair UV-induced single-stranded DNA damage. Here, we characterize a hypothetical gene Vca0809 encoding a new member of CPF in this organism. The spectroscopic analysis of the purified protein indicated that this enzyme possessed a catalytic cofactor, FAD, and photoantenna chromophore 6,7-dimethyl 8-ribityl-lumazin. With a slot blot-based DNA repair assay, we showed that it possessed (6-4) photolyase activity. Further phylogenetic and computational analyses enabled us to classify this gene as a member of the family of iron-sulfur bacterial cryptochromes and photolyases (FeS-BCP). Therefore, we named this gene Vc(6-4) FeS-BCP.
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Affiliation(s)
- Ugur Meric Dikbas
- Department of Molecular Biology and Genetics , Koc University , Rumelifeneri Yolu, Sariyer , Istanbul 34450 , Turkey
| | - Mehmet Tardu
- Department of Chemical and Biological Engineering , Koc University , Rumelifeneri Yolu, Sariyer , Istanbul 34450 , Turkey
| | - Asena Canturk
- Department of Molecular Biology and Genetics , Gebze Technical University , Gebze 41400 , Kocaeli , Turkey
| | - Seref Gul
- Department of Chemical and Biological Engineering , Koc University , Rumelifeneri Yolu, Sariyer , Istanbul 34450 , Turkey
| | - Gozde Ozcelik
- Department of Molecular Biology and Genetics , Gebze Technical University , Gebze 41400 , Kocaeli , Turkey
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics , Koc University , Rumelifeneri Yolu, Sariyer , Istanbul 34450 , Turkey
| | - Nuri Ozturk
- Department of Molecular Biology and Genetics , Gebze Technical University , Gebze 41400 , Kocaeli , Turkey
| | - Ibrahim Halil Kavakli
- Department of Molecular Biology and Genetics , Koc University , Rumelifeneri Yolu, Sariyer , Istanbul 34450 , Turkey.,Department of Chemical and Biological Engineering , Koc University , Rumelifeneri Yolu, Sariyer , Istanbul 34450 , Turkey
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Kurtulus-Ulkuer M, Ulkuer U, Baris I. Evaluation of SNPs in the Mitochondrial DNA Using NanoChip Microarrays in the Turkish Population. INT J HUM GENET 2017. [DOI: 10.1080/09723757.2015.11886259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Melahat Kurtulus-Ulkuer
- Department of Pharmaceutical Microbiology, Faculty of Pharmacy, University of Gazi, Ankara, Turkey
| | - Uner Ulkuer
- General Directorate of Security, Ankara, Turkey
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics, University of Koc, Istanbul, Turkey
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9
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Kavakli IH, Baris I, Tardu M, Gül Ş, Öner H, Çal S, Bulut S, Yarparvar D, Berkel Ç, Ustaoğlu P, Aydın C. The Photolyase/Cryptochrome Family of Proteins as DNA Repair Enzymes and Transcriptional Repressors. Photochem Photobiol 2017; 93:93-103. [DOI: 10.1111/php.12669] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 11/02/2016] [Indexed: 12/14/2022]
Affiliation(s)
- Ibrahim Halil Kavakli
- Department of Chemical and Biological Engineering; Koc University; Sariyer Istanbul Turkey
- Department of Molecular Biology and Genetics; Koc University; Sariyer Istanbul Turkey
- Department of Computational Science and Engineering; Koc University; Sariyer Istanbul Turkey
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics; Koc University; Sariyer Istanbul Turkey
| | - Mehmet Tardu
- Department of Computational Science and Engineering; Koc University; Sariyer Istanbul Turkey
| | - Şeref Gül
- Department of Chemical and Biological Engineering; Koc University; Sariyer Istanbul Turkey
| | - Haşimcan Öner
- Department of Chemical and Biological Engineering; Koc University; Sariyer Istanbul Turkey
| | - Sibel Çal
- Department of Molecular Biology and Genetics; Koc University; Sariyer Istanbul Turkey
| | - Selma Bulut
- Department of Chemical and Biological Engineering; Koc University; Sariyer Istanbul Turkey
| | - Darya Yarparvar
- Department of Chemical and Biological Engineering; Koc University; Sariyer Istanbul Turkey
| | - Çağlar Berkel
- Department of Molecular Biology and Genetics; Koc University; Sariyer Istanbul Turkey
| | - Pınar Ustaoğlu
- Department of Molecular Biology and Genetics; Koc University; Sariyer Istanbul Turkey
| | - Cihan Aydın
- Department of Molecular Biology and Genetics; Istanbul Medeniyet University; Uskudar Istanbul
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10
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Seferoglu AB, Gul S, Dikbas UM, Baris I, Koper K, Caliskan M, Cevahir G, Kavakli IH. Glu-370 in the large subunit influences the substrate binding, allosteric, and heat stability properties of potato ADP-glucose pyrophosphorylase. Plant Sci 2016; 252:125-132. [PMID: 27717448 DOI: 10.1016/j.plantsci.2016.07.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 07/12/2016] [Accepted: 07/13/2016] [Indexed: 06/06/2023]
Abstract
ADP-glucose pyrophosphorylase (AGPase) is a key allosteric enzyme in plant starch biosynthesis. Plant AGPase is a heterotetrameric enzyme that consists of large (LS) and small subunits (SS), which are encoded by two different genes. In this study, we showed that the conversion of Glu to Gly at position 370 in the LS of AGPase alters the heterotetrameric stability along with the binding properties of substrate and effectors of the enzyme. Kinetic analyses revealed that the affinity of the LSE370GSSWT AGPase for glucose-1-phosphate is 3-fold less than for wild type (WT) AGPase. Additionally, the LSE370GSSWT AGPase requires 3-fold more 3-phosphogyceric acid to be activated. Finally, the LSE370GSSWTAGPase is less heat stable compared with the WT AGPase. Computational analysis of the mutant Gly-370 in the 3D modeled LS AGPase showed that this residue changes charge distribution of the surface and thus affect stability of the LS AGPase and overall heat stability of the heterotetrameric AGPase. In summary, our results show that LSE370 intricately modulate the heat stability and enzymatic activity of potato the AGPase.
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Affiliation(s)
- Ayse Bengisu Seferoglu
- Koc University, Department of Chemical and Biological Engineering, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Seref Gul
- Koc University, Department of Chemical and Biological Engineering, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Ugur Meric Dikbas
- Koc University, Department of Molecular Biology and Genetics, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Ibrahim Baris
- Koc University, Department of Molecular Biology and Genetics, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Kaan Koper
- Koc University, Department of Chemical and Biological Engineering, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey
| | - Mahmut Caliskan
- Istanbul University, Department of Biology, 34134 Suleymaniye, Istanbul, Turkey
| | - Gul Cevahir
- Istanbul University, Department of Biology, 34134 Suleymaniye, Istanbul, Turkey
| | - Ibrahim Halil Kavakli
- Koc University, Department of Chemical and Biological Engineering, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey; Koc University, Department of Molecular Biology and Genetics, Rumelifeneri Yolu, Sariyer, Istanbul, Turkey.
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Tardu M, Dikbas UM, Baris I, Kavakli IH. RNA-seq analysis of the transcriptional response to blue and red light in the extremophilic red alga, Cyanidioschyzon merolae. Funct Integr Genomics 2016; 16:657-669. [DOI: 10.1007/s10142-016-0521-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 08/22/2016] [Accepted: 08/30/2016] [Indexed: 10/21/2022]
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Cakirlar FK, Samasti M, Baris I, Kavakli H, Karakullukcu A, Sirekbasan S, Bagdatli Y. The epidemiological and molecular characterization of vancomycin-resistant enterococci isolated from rectal swab samples of hospitalized patients in Turkey. Clin Lab 2015; 60:1807-12. [PMID: 25648020 DOI: 10.7754/clin.lab.2014.131204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Vancomycin-resistant enterococci (VRE) are a serious problem all over the world. The present study was conducted to investigate antimicrobial resistance patterns, genotypes, clonal relationship, and virulence fac- tors of VRE species isolated from rectal swab samples of hospitalized patients, patient's relatives, and medical staff at Istanbul University Cerrahpasa Medical School hospital. METHODS The VRE isolates were typed with an automated VITEK system and their antibiotic sensibilities were analysed by disc diffusion and Etest® method. The molecular characterization and clonal relationships were per- formed using a PCR method and virulence genes by sequence typing. RESULTS A total of 100 (10.3%) of the 971 patients were colonized with VRE. None of the investigated 25 patient's relatives and 45 medical staff carried VRE. All VRE strains were identified as E. faecium. They were vanA genotype and originated from a single clone. VRE strains exhibited multi-drug resistance. High-level gentamicin-resistance was 93%. However, lower resistance rates were found for linezolid (40%) and quinopristin-dalfopristin (11%). The enterococcal surface protein gene esp was found positive in 87 of 100 isolates, and four strains were positive for the cylB (cytolysin) gene. CONCLUSIONS The identification of VRE strains to the species level and detection of virulence genes will assist in infection control practices.
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Cakmak O, Ermek E, Kilinc N, Bulut S, Baris I, Kavakli IH, Yaralioglu GG, Urey H. A cartridge based sensor array platform for multiple coagulation measurements from plasma. Lab Chip 2015; 15:113-120. [PMID: 25353144 DOI: 10.1039/c4lc00809j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper proposes a MEMS-based sensor array enabling multiple clot-time tests for plasma in one disposable microfluidic cartridge. The versatile LoC (Lab-on-Chip) platform technology is demonstrated here for real-time coagulation tests (activated Partial Thromboplastin Time (aPTT) and Prothrombin Time (PT)). The system has a reader unit and a disposable cartridge. The reader has no electrical connections to the cartridge. This enables simple and low-cost cartridge designs and avoids reliability problems associated with electrical connections. The cartridge consists of microfluidic channels and MEMS microcantilevers placed in each channel. The microcantilevers are made of electroplated nickel. They are actuated remotely using an external electro-coil and the read-out is also conducted remotely using a laser. The phase difference between the cantilever oscillation and the coil drive is monitored in real time. During coagulation, the viscosity of the blood plasma increases resulting in a change in the phase read-out. The proposed assay was tested on human and control plasma samples for PT and aPTT measurements. PT and aPTT measurements from control plasma samples are comparable with the manufacturer's datasheet and the commercial reference device. The measurement system has an overall 7.28% and 6.33% CV for PT and aPTT, respectively. For further implementation, the microfluidic channels of the cartridge were functionalized for PT and aPTT tests by drying specific reagents in each channel. Since simultaneous PT and aPTT measurements are needed in order to properly evaluate the coagulation system, one of the most prominent features of the proposed assay is enabling parallel measurement of different coagulation parameters. Additionally, the design of the cartridge and the read-out system as well as the obtained reproducible results with 10 μl of the plasma samples suggest an opportunity for a possible point-of-care application.
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Affiliation(s)
- O Cakmak
- Koç University, Mechanical Engineering, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey.
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Mete F, Ozkaya E, Aras S, Koksal V, Etlik O, Baris I. Association between gene polymorphisms in TIM1, TSLP, IL18R1 and childhood asthma in Turkish population. Int J Clin Exp Med 2014; 7:1071-1077. [PMID: 24955184 PMCID: PMC4057863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 03/13/2014] [Indexed: 06/03/2023]
Abstract
UNLABELLED Many immunologic and inflammatory mechanisms play a role in asthma etiology. The aim of this study was to investigate the susceptibility of asthma patients in the Turkish population with demonstrating genes for polymorphisms in TIM1, TSLP and IL18R1. All of the genomic DNA samples were isolated from blood samples according to a standard salting-out protocol. DNA samples were stored at -20°C until the genotype analysis was performed. rs3806933 (TSLP -847 C > T) and TIM1 -416G > C were analyzed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The rs3806933 (TSLP -847 C > T) was genotyped by PCR using our new primers and HphI restriction enzyme digestion. rs2287033 (IL18R1 c. 1270+150 A > G), rs3213733 (IL18R1 c. 626-196 G > T), and rs3771166 (IL18R1- c. 302+1694 C > T) were genotyped using SYBR green dye based real time PCR assay. RESULTS The allele frequencies of 5 SNPs in TSLP, TIM-1, and IL18R1 genes were determined in 139 asthmatic patients and 126 healthy controls of in Turkish population. The investigated SNPs are as follows; rs3806933 (TSLP -847 C > T), TIM1 -416G > C, rs2287033 (IL18R1 c. 1270+150 A > G), rs3213733 (IL18R1 c. 626-196 G > T), and rs3771166 (IL18R1- c. 302+1694 C > T). Results suggest that IL18R1 c. 626-196 G > T (rs3213733) and TIM1 -416G > C are significantly associated with asthma in patients in Turkish population. Patients with AA genotypes of rs2287033 (IL18R1 c. 1270+150 A > G), have significantly less total serum IgE levels when compared with patients having GG or GA genotypes (p < 0.012; 381.77±239.46 vs 557.52±549.96, respectively). CONCLUSION This study showed that IL18R1 c. 626 -196 G > T (rs3213733) and TIM1 -416G > C are significantly associated with asthma patients in Turkish population.
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Affiliation(s)
- Fatih Mete
- Department of Pediatrics, Kanuni Sultan Suleyman Training and Research HospitalTurkey
| | - Emin Ozkaya
- Department of Pediatrics, Bezm-i Alem University Medical FacultyTurkey
| | - Sukru Aras
- Department of Biochemistry, Sifa University Medical FacultyTurkey
| | - Vedat Koksal
- Department of Histology, Sifa University Medical FacultyTurkey
| | - Ozdal Etlik
- Department of Genetics, Sifa University Medical FacultyTurkey
| | - Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc UniversityTurkey
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Cakmak O, Elbuken C, Ermek E, Mostafazadeh A, Baris I, Erdem Alaca B, Kavakli IH, Urey H. Microcantilever based disposable viscosity sensor for serum and blood plasma measurements. Methods 2013; 63:225-32. [PMID: 23880427 DOI: 10.1016/j.ymeth.2013.07.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 05/24/2013] [Accepted: 07/02/2013] [Indexed: 11/26/2022] Open
Abstract
This paper proposes a novel method for measuring blood plasma and serum viscosity with a microcantilever-based MEMS sensor. MEMS cantilevers are made of electroplated nickel and actuated remotely with magnetic field using an electro-coil. Real-time monitoring of cantilever resonant frequency is performed remotely using diffraction gratings fabricated at the tip of the dynamic cantilevers. Only few nanometer cantilever deflection is sufficient due to interferometric sensitivity of the readout. The resonant frequency of the cantilever is tracked with a phase lock loop (PLL) control circuit. The viscosities of liquid samples are obtained through the measurement of the cantilever's frequency change with respect to a reference measurement taken within a liquid of known viscosity. We performed measurements with glycerol solutions at different temperatures and validated the repeatability of the system by comparing with a reference commercial viscometer. Experimental results are compared with the theoretical predictions based on Sader's theory and agreed reasonably well. Afterwards viscosities of different Fetal Bovine Serum and Bovine Serum Albumin mixtures are measured both at 23°C and 37°C, body temperature. Finally the viscosities of human blood plasma samples taken from healthy donors are measured. The proposed method is capable of measuring viscosities from 0.86 cP to 3.02 cP, which covers human blood plasma viscosity range, with a resolution better than 0.04 cP. The sample volume requirement is less than 150 μl and can be reduced significantly with optimized cartridge design. Both the actuation and sensing are carried out remotely, which allows for disposable sensor cartridges.
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Affiliation(s)
- Onur Cakmak
- Koc University, Mechanical Engineering, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey.
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Baris I, Etlik O, Koksal V, Ocak Z, Baris ST. SYBR green dye-based probe-free SNP genotyping: introduction of T-Plex real-time PCR assay. Anal Biochem 2013; 441:225-31. [PMID: 23872005 DOI: 10.1016/j.ab.2013.07.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 06/29/2013] [Accepted: 07/01/2013] [Indexed: 11/30/2022]
Abstract
Single-nucleotide polymorphism (SNP) genotyping is widely used in genetic association studies to characterize genetic factors underlying inherited traits. Despite many recent advances in high-throughput SNP genotyping, inexpensive and flexible methods with reasonable throughput levels are still needed. Real-time PCR methods for discovering and genotyping SNPs are becoming increasingly important in various fields of biology. In this study, we introduce a new, single-tube strategy that combines the tetra-primer ARMS PCR assay, SYBR Green I-based real-time PCR, and melting-point analysis with primer design strategies to detect the SNP of interest. This assay, T-Plex real-time PCR, is based on the T(m) discrimination of the amplified allele-specific amplicons in a single tube. The specificity, sensitivity, and robustness of the assay were evaluated for common mutations in the FV, PII, MTHFR, and FGFR3 genes. We believe that T-Plex real-time PCR would be a useful alternative for either individual genotyping requests or large epidemiological studies.
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Affiliation(s)
- Ibrahim Baris
- Department of Molecular Biology and Genetics, Koc University, 34450 Istanbul, Turkey.
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17
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Seferoglu AB, Baris I, Morgil H, Tulum I, Ozdas S, Cevahir G, Kavakli IH. Transcriptional regulation of the ADP-glucose pyrophosphorylase isoforms in the leaf and the stem under long and short photoperiod in lentil. Plant Sci 2013; 205-206:29-37. [PMID: 23498860 DOI: 10.1016/j.plantsci.2013.01.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 01/19/2013] [Accepted: 01/22/2013] [Indexed: 05/23/2023]
Abstract
ADP-glucose pyrophosphorylase (AGPase) is a key enzyme in plant starch biosynthesis. It contains large (LS) and small (SS) subunits encoded by two different genes. In this study, we explored the transcriptional regulation of both the LS and SS subunits of AGPase in stem and leaf under different photoperiods length in lentil. To this end, we first isolated and characterized different isoforms of the LS and SS of lentil AGPase and then we performed quantitative real time PCR (qPCR) to see the effect of photoperiod length on the transcription of the AGPase isforms under the different photoperiod regimes in lentil. Analysis of the qPCR results revealed that the transcription of different isoforms of the LSs and the SSs of lentil AGPase are differentially regulated when photoperiod shifted from long-day to short-day in stem and leaves. While transcript levels of LS1 and SS2 in leaf significantly decreased, overall transcript levels of SS1 increased in short-day regime. Our results indicated that day length affects the transcription of lentil AGPase isoforms differentially in stems and leaves most likely to supply carbon from the stem to other tissues to regulate carbon metabolism under short-day conditions.
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Affiliation(s)
- Ayse Bengisu Seferoglu
- Koc University, Department of Chemical and Biological Engineering, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
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Bilir B, Yapici Z, Yalcinkaya C, Baris I, Carvalho CMB, Bartnik M, Ozes B, Eraksoy M, Lupski JR, Battaloglu E. High frequency of GJA12/GJC2 mutations in Turkish patients with Pelizaeus-Merzbacher disease. Clin Genet 2012; 83:66-72. [PMID: 22283455 DOI: 10.1111/j.1399-0004.2012.01846.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pelizaeus-Merzbacher disease is an early onset dysmyelinating leukodystrophy. About 80% of PMD cases have been associated with duplications and mutations of the proteolipid protein 1 (PLP1) gene. Pelizaeus-Merzbacher-like disease is a genetically heterogeneous autosomal recessive disease and rarely caused by mutations in gap junction protein α12 (GJA12/GJC2) gene. The molecular basis of the disease was investigated in a cohort of 19 Turkish families. This study identified novel chromosomal rearrangements proximal and distal to, and exclusive of the PLP1 gene, showed equal frequencies of PLP1 and GJA12/GJC2 mutations at least in our cohort, and suggested further genetic heterogeneity.
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Affiliation(s)
- B Bilir
- Department of Molecular Biology and Genetics, Bogazici University, Istanbul, Turkey
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19
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Etlik O, Koksal V, Arican-Baris ST, Baris I. Development and validation of a cost-effective in-house method, tetra-primer ARMS PCR assay, in genotyping of seven clinically important point mutations. Mol Cell Probes 2011; 25:177-81. [PMID: 21530640 DOI: 10.1016/j.mcp.2011.04.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2010] [Revised: 04/16/2011] [Accepted: 04/18/2011] [Indexed: 11/25/2022]
Abstract
The single nucleotide polymorphism (SNP) genotyping is currently considered as a particularly valuable tool for the diagnosis of different pathologies. For this reason, over the past several years a great deal of effort has been devoted to developing accurate, rapid, and cost-effective technologies for SNP analysis. Although a large number of distinct approaches has been reported each laboratory use one of the published methods based on their technical and economical capacity. This article presents an application of an in-house assay, tetra-primer ARMS PCR assay, and its application in SNP genotyping. We have shown that this assay could be more advantageous when compared with PCR-RFLP, real time PCR, and DNA sequencing. We have shown that the assay is successful in genotyping using archived paraffin-embedded tissues, heparinated samples and amniotic fluids with meconium. These low-costed (3$/reaction) assays could be completed within 3-4 h after specimen receipt allowing for a reasonable turn-around time in the laboratory. Since tetra-primer ARMS PCR assay does not require any special equipment, the assay could be set up in most clinical diagnostic laboratories.
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Affiliation(s)
- Ozdal Etlik
- BURC Molecular Diagnostic Laboratories, Merter İş Merkezi, Istanbul, Turkey
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20
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Ozber N, Baris I, Tatlici G, Gur I, Kilinc S, Unal EB, Kavakli IH. Identification of two amino acids in the C-terminal domain of mouse CRY2 essential for PER2 interaction. BMC Mol Biol 2010; 11:69. [PMID: 20840750 PMCID: PMC2944120 DOI: 10.1186/1471-2199-11-69] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2010] [Accepted: 09/14/2010] [Indexed: 05/17/2023] Open
Abstract
BACKGROUND Cryptochromes (CRYs) are a class of flavoprotein blue-light signaling receptors found in plants and animals, and they control plant development and the entrainment of circadian rhythms. They also act as integral parts of the central circadian oscillator in humans and other animals. In mammals, the CLOCK-BMAL1 heterodimer activates transcription of the Per and Cry genes as well as clock-regulated genes. The PER2 proteins interact with CRY and CKIε, and the resulting ternary complexes translocate into the nucleus, where they negatively regulate the transcription of Per and Cry core clock genes and other clock-regulated output genes. Recent studies have indicated that the extended C-termini of the mammalian CRYs, as compared to photolyase proteins, interact with PER proteins. RESULTS We identified a region on mCRY2 (between residues 493 and 512) responsible for direct physical interaction with mPER2 by mammalian two-hybrid and co-immunoprecipitation assays. Moreover, using oligonucleotide-based degenerate PCR, we discovered that mutation of Arg-501 and Lys-503 of mCRY2 within this C-terminal region totally abolishes interaction with PER2. CONCLUSIONS Our results identify mCRY2 amino acid residues that interact with the mPER2 binding region and suggest the potential for rational drug design to inhibit CRYs for specific therapeutic approaches.
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Affiliation(s)
- Natali Ozber
- Material Science and Engineering, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
| | - Ibrahim Baris
- Department of Chemical and Biological Engineering, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
| | - Gulnaz Tatlici
- Department of Chemical and Biological Engineering, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
| | - Ibrahim Gur
- Department of Chemical and Biological Engineering, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
| | - Seda Kilinc
- Centre for Computational Biology and Bioinformatics, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
| | - Evrim B Unal
- Centre for Computational Biology and Bioinformatics, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
| | - Ibrahim H Kavakli
- Material Science and Engineering, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
- Department of Chemical and Biological Engineering, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
- Centre for Computational Biology and Bioinformatics, College of Engineering, Koc University, Rumeli Feneri Yolu, 34450 Sariyer, Istanbul, Turkey
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Baris I, Etlik O, Koksal V, Arican-Baris ST. Rapid diagnosis of spinal muscular atrophy using tetra-primer ARMS PCR assay: simultaneous detection of SMN1 and SMN2 deletion. Mol Cell Probes 2009; 24:138-41. [PMID: 20025960 DOI: 10.1016/j.mcp.2009.12.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 11/15/2009] [Accepted: 12/02/2009] [Indexed: 01/02/2023]
Abstract
Spinal muscular atrophy (SMA), the leading genetic cause of death in childhood, is an autosomal recessive neuromuscular disorder characterized by progressive muscle weakness, associated with deletions of the survival motor neuron 1 (SMN1) gene. Approximately 94% of SMA patients carry homologous deletions of SMN1 exon(s) 7 (and 8). Because of the high incidence and severity of the disease, precise detection and quantification of SMN1 and SMN2 gene copy numbers is essential for diagnosis and genetic counseling. We have developed a reliable single-tube tetra-primer PCR assay to simultaneously detect both the SMN1 and SMN2 exon 7 deletion using the advantage of C/T difference at nucleotide position of 840 in exon 7. The assay has been optimized and tested in 48 healthy controls, 20 known patients with SMA, 12 carriers (one SMN1 copy), and 8 amniotic fluids suspected of having SMA for whom we had determined the SMN1/SMN2 deletion by an additional PCR-RFLP method. We have observed complete concordance between methods. Our tetra-primer PCR assay is sensitive, low-cost, and easy to use method for simultaneous detection of both SMN1 and SMN2 deletion, which could be used even in "low-tech" laboratories.
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Affiliation(s)
- Ibrahim Baris
- Department of Chemical and Biological Engineering, KOC University, Istanbul, Turkey.
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Abstract
Charcot-Marie-Tooth (CMT) disease is a hereditary demyelinating peripheral neuropathy, and CMT Type 1A is the most common form. In most cases, CMT1A is usually caused by duplication at chromosome 17p11.2-12. Type 2 diabetes mellitus (Type 2 DM) is a common metabolic disorder, characterized by chronic hyperglycemia that can be associated with micro- and/or macrovascular complications. Only a few studies reported CMT1A duplication in association with Type 2 DM. This article explores the characteristics of a large family of 69 members with respect to CMT1A and Type 2 DM. CMT1A was detected in 28 of them. Molecular genetic study was performed in 22, and duplication was detected in all of them. Six of the 22 members with CMT1A also had Type 2 DM based on the American Diabetes Association diagnostic criteria. Association of these two conditions may be coincidental; however, the occurrence of these two diseases in this large family may also suggest a genetic basis. More extensive reports and further investigations of such families having this combination will certainly provide a better understanding of this link.
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Affiliation(s)
- Filiz Koç
- Department of Neurology, Cukurova University Medical School, Adana, Turkey.
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Abstract
Rett syndrome (RTT), an X-linked dominant neurodevelopmental disorder, is caused mainly by de novo mutations in the methyl-CpG-binding protein 2 gene (MECP2). Although more than 200 different MECP2 mutations have been identified throughout the gene, 7 of those (p.R133C, p.T158M, p.R168X, p.R255X, p.R270X, p.R294X, and p.R306C) account for up to two-thirds of pathogenic mutations in RTT patients. A rapid and efficient screening strategy for these mutations can be used as a preliminary step for genetic diagnosis of RTT. The current protocols used for this purpose are of high cost and require special equipment. We have designed a simpler multiplex amplification refractory mutation system (ARMS)-PCR strategy that allows identification of these common MECP2 mutant alleles in four PCR reactions. The assay was tested in 14 RTT patients who were previously genotyped using PCR-restriction fragment length polymorphism and DNA sequencing. A complete concordance was observed between the results of the two methods. The multiplex ARMS-PCR does not require any special equipment, and it provides rapid, reproducible, and cost-effective detection of common MECP2 mutations. The assay can be carried out efficiently in a standard molecular genetics laboratory and suitable as a preliminary screen for all patients with RTT diagnosis.
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Affiliation(s)
- Ibrahim Baris
- Department of Molecular Biology and Genetics, Bogazici University, Istanbul, Turkey.
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Bayrak AO, Battaloglu E, Turker H, Baris I, Oztas G. Hereditary neuropathy with liability to pressure palsy (HNPP) in childhood: a case study emphasizing the relevance of detailed electrophysiological examination for suspected HNPP in the first decade. Brain Dev 2009; 31:445-8. [PMID: 18760885 DOI: 10.1016/j.braindev.2008.07.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2007] [Revised: 06/24/2008] [Accepted: 07/02/2008] [Indexed: 11/19/2022]
Abstract
Hereditary neuropathy with liability to pressure palsy (HNPP) is an autosomal dominant disorder characterized by recurrent mono-neuropathies secondary to minor trauma or compression. Whilst typical episodes of palsy generally become apparent during the second and the third decades, HNPP is rarely diagnosed in the first decade. We present the case of a 6-year-old patient to draw attention to the possibility of HNPP attacks in the first decade and the importance of detailed electrophysiological examination.
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Affiliation(s)
- Ayşe Oytun Bayrak
- Department of Neurology, School of Medicine, Ondokuz Mayis University, Samsun, Turkey.
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Koksal V, Etlik O, Arican-Baris ST, Baris I. A tetra-primer polymerase chain reaction approach for the detection of JAK2 V617F mutation. ACTA ACUST UNITED AC 2008; 11:463-6. [PMID: 18294066 DOI: 10.1089/gte.2007.0051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Recently, an acquired somatic point mutation (p.V617F) in a highly conserved residue of the pseudokinase domain of the JAK2 tyrosine kinase was shown to be associated with myeloproliferative disorders. Because of the clinical importance of this mutation in diagnosing myeloproliferative disorders and its relevance for disease progression, we have developed a tetra-primer polymerase chain reaction (PCR) assay to detect JAK2 p.V617F. Titration studies showed that the assay could reliably detect one copy of the mutant allele in a mix of 50 wild-type alleles suggesting that the lower detection limit of this assay is estimated to be 2%. This study demonstrates that genotyping and quantifying of the JAK2 V617F mutation can be performed by tetra-primer PCR using both freshly isolated and formalin-fixed tissues. Our tetra-primer PCR assay is sensitive, low-cost, and easy to use method for the detection of JAK2 p.V617F, which could be used even in low-tech laboratories.
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Affiliation(s)
- Vedat Koksal
- Burc Molecular Diagnostic Laboratory, Vali Konagi Cad, Istanbul, Turkey
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Etlik O, Koksal V, Tugba Arican-Baris S, Baris I. An improved tetra-primer PCR approach for the detection of the FGFR3 G380R mutation responsible for achondroplasia. Mol Cell Probes 2008; 22:71-5. [PMID: 17683901 DOI: 10.1016/j.mcp.2007.06.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2007] [Revised: 05/11/2007] [Accepted: 06/12/2007] [Indexed: 11/13/2022]
Abstract
Achondroplasia is the most common form of dwarfism and has an incidence of approximately 1/7500. In more than 98% of cases, the disease is associated with a G to A or G to C substitution at nucleotide position 1138 (p.G380R) of the fibroblast growth factor receptor 3 (FGFR3) gene. We have developed a sensitive single tube tetra-primer PCR assay to detect both the c.1138G>A and c.1138G>C mutations and can successfully distinguish DNA samples that are homozygous and heterozygous for the c.1138G>A mutation. Titration studies showed that the assay could reliably detect one copy of the mutant allele in a mix of 100 wild-type alleles. The assay has been tested in 50 healthy controls, 3 known patients with achondroplasia, and 5 amniotic fluids suspected of having achondroplasia and for whom we had previously determined the genotypes for the c.1138G>A mutation by PCR-RFLP. We have observed complete concordance between methods. Our tetra-primer PCR assay is sensitive, low-cost, and easy to use method for FGFR3 p.G380R genotyping, which could be used even in "low-tech" laboratories.
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Affiliation(s)
- Ozdal Etlik
- BURC Molecular Diagnostic Laboratory, Vali Konagi Cad, 34365 Sisli, Istanbul, Turkey
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Koksal V, Baris I, Etlik O. Primer-engineered multiplex PCR-RFLP for detection of MTHFR C677T, prothrombin G20210A and factor V Leiden mutations. Exp Mol Pathol 2006; 83:1-3. [PMID: 17275807 DOI: 10.1016/j.yexmp.2006.12.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2006] [Revised: 12/19/2006] [Accepted: 12/19/2006] [Indexed: 11/25/2022]
Abstract
Single-nucleotide polymorphisms in the genes that code for coagulation factors V (factor V Leiden) and II (prothrombin, G20210A), as well as the methylenetetrahydrofolate reductase (MTHFR, C677T) gene, have been implicated in the majority of cases of hereditary thrombophilia. We have developed a multiplex PCR-RFLP assay based on MnlI endonuclease digestion for the simultaneous detection of mutations in the FV, FII, and MTHFR genes. Digested amplification products were analyzed by gel electrophoresis in a single gel lane and visualized by ethidium bromide. This approach is a rapid and convenient method, hence economic, that alternate to others described for the detection of FVL, G20210A and C677T mutations.
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Affiliation(s)
- Vedat Koksal
- Burc Molecular Diagnostic Laboratory, Istanbul, Turkey
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Baris I, Arisoy AE, Smith A, Agostini M, Mitchell CS, Park SM, Halefoglu AM, Zengin E, Chatterjee VK, Battaloglu E. A novel missense mutation in human TTF-2 (FKHL15) gene associated with congenital hypothyroidism but not athyreosis. J Clin Endocrinol Metab 2006; 91:4183-7. [PMID: 16882747 DOI: 10.1210/jc.2006-0405] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
BACKGROUND Thyroid dysgenesis is the most frequent cause of congenital hypothyroidism (CH), and its genetic basis is largely unknown. Hitherto, two mutations in the human thyroid transcription factor 2 (TTF-2) gene have been described in unrelated cases of CH with cleft palate, spiky hair, variable choanal atresia, and complete thyroid agenesis. Here, we describe a novel TTF-2 mutation in a female child resulting in syndromic CH in the absence of thyroid agenesis. RESULTS The index case is homozygous for an arginine to cysteine mutation (R102C) of a highly conserved residue within the forkhead, DNA binding domain of TTF-2. Her consanguineous, heterozygous parents are unaffected, and the mutation was not detected in 100 control chromosomes. Consonant with its location, the R102C mutant TTF-2 protein showed loss of DNA binding and was transcriptionally inactive. CH in the proposita was associated with cleft palate, spiky hair, and bilateral choanal atresia. However, radiological studies showed the presence of thyroid tissue in a eutopic location. CONCLUSION Our findings indicate that human thyroid development can occur despite loss of TTF-2 function and suggest that TTF-2 gene defects should also be considered in cases of syndromic CH without total athyreosis.
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Affiliation(s)
- I Baris
- Boğaziçi University, Department of Molecular Biology and Genetics, Bebek, 34342 Istanbul, Turkey
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Yildiz TS, Solak M, Baris I, Toker K. Unexpected prolonged paralysis after mivacurium in a patient with Bamforth syndrome. Paediatr Anaesth 2006; 16:892-4. [PMID: 16884476 DOI: 10.1111/j.1460-9592.2006.01919.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
Mutations in the Connexin-26 (specified GJB2) gene have been shown to be a major cause of nonsyndromic recessive deafness (NSRD), and a single mutation 35delG in the GJB2 gene accounts for the majority of cases of NSRD. For diagnostic analyses and for scientific studies of large numbers of patients, fast and economic assays that can be performed with standard polymerase chain reaction (PCR) instruments are highly desirable. We have developed an allele-specific amplification (ASA)-based restriction fragment length polymorphism (RFLP) assay. We evaluated the multiplex method for its ability to 35delG mutation. Our method is a stable, reproducible and concordend with previously reported PCR-RFLP assays.
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Affiliation(s)
- Ibrahim Baris
- Department of Molecular Biology and Genetics, Bogazici University, 34342, Istanbul, Turkey.
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Abstract
Factor V Leiden and prothrombin G20210A are clinically relevant genetic risk factors for venous thrombosis. Molecular diagnostic testing for factor V Leiden and prothrombin G20210A is widespread, and laboratories use a variety of technical approaches. Here we introduce a multiplex polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) based on single (Mn/l) restriction endonuclease digestion. The assay was shown to simultaneously and accurately detect factor V Leiden and prothrombin G20210A mutations.
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Affiliation(s)
- Ibrahim Baris
- Department of Molecular Biology and Genetics, Bogazici University, 34342, Istanbul, Turkey.
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Parman Y, Battaloglu E, Baris I, Bilir B, Poyraz M, Bissar-Tadmouri N, Williams A, Ammar N, Nelis E, Timmerman V, De Jonghe P, Najafov A, Necefov A, Deymeer F, Serdaroglu P, Brophy PJ, Said G. Clinicopathological and genetic study of early-onset demyelinating neuropathy. ACTA ACUST UNITED AC 2004; 127:2540-50. [PMID: 15469949 DOI: 10.1093/brain/awh275] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Autosomal recessive demyelinating Charcot-Marie-Tooth disease (CMT4), Dejerine-Sottas disease and congenital hypomyelinating neuropathy are variants of hereditary demyelinating neuropathy of infancy, a genetically heterogeneous group of disorders. To explore the spectrum of early-onset demyelinating neuropathies further, we studied the clinicopathological and genetic aspects of 20 patients born to unaffected parents. In 19 families out of 20, consanguinity between the parents or presence of an affected sib suggested autosomal recessive transmission. Screening of various genes known to be involved in CMT4 revealed six mutations of which five are novel. Four of these novel mutations occurred in the homozygous state and include: one in GDAP1, one in MTMR2, one in PRX and one in KIAA1985. One patient was heterozygous for a novel MTMR2 mutation and still another was homozygous for the founder mutation, R148X, in NDRG1. All patients tested negative for mutations in EGR2. Histopathological examination of nerve biopsy specimens showed a severe, chronic demyelinating neuropathy, with onion bulb formation, extensive demyelination of isolated fibres and axon loss. We did not discern a specific pattern of histopathology that could be correlated to mutations in a particular gene.
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Affiliation(s)
- Yesim Parman
- Department of Neurology, Istanbul Medical Faculty, Istanbul University, Millet Cad., Capa, 34390 Istanbul, Turkey.
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Abstract
Hearing impairment that results from inherited genetic defects occurs in approximately 1/2,000 live births. Mutations in the Connexin-26 gene have been shown to be a major contributor to prelingual, nonsyndromic, autosomal recessive deafness in many populations. The most common mutations in this gene are 35delG, 167delT, 235delC, M34T, and W77X. We describe a nonisotopic, single-tube, polymerase chain reaction (PCR) multiplex system for the detection of these common mutations. The method presented is reliable, simple, and low in cost.
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Affiliation(s)
- I Baris
- Department of Molecular Biology and Genetics, Bogazici University, Bebek 80815, Istanbul, Turkey.
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Dumortier P, Coplü L, Broucke I, Emri S, Selcuk T, de Maertelaer V, De Vuyst P, Baris I. Erionite bodies and fibres in bronchoalveolar lavage fluid (BALF) of residents from Tuzköy, Cappadocia, Turkey. Occup Environ Med 2001; 58:261-6. [PMID: 11245743 PMCID: PMC1740123 DOI: 10.1136/oem.58.4.261] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
OBJECTIVES The high incidence of malignant mesothelioma in some villages of Cappadocia (Turkey) is due to environmental exposure to erionite fibres. The aim was to evaluate the fibre burden in bronchoalveolar lavage fluid (BALF) from inhabitants of an erionite village and compare it with Turkish subjects with or without environmental exposure to tremolite asbestos. METHODS Ferruginous bodies (FBs) and fibres were measured and analyzed by light and transmission electron microscopy (TEM) in the BALF of 16 subjects originating from Tuzköy. RESULTS FBs were detected in the BALF of 12 subjects, with concentrations above 1 FB/ml in seven of them. Erionite was the central fibre of 95.7% of FBs. Erionite fibres were found in the BALF of all subjects, by TEM, and these fibres were low in Mg, K, and Ca compared with erionite from Tuzköy soil. The mean concentration of erionite fibres in BALF was similar to that of tremolite fibres in Turks with environmental exposure to tremolite. The proportion of fibres longer than 8 microm in BALF represented 35.6% for erionite compared with 14.0% for tremolite. The asbestos fibre concentrations in erionite villagers was not different from that in Turks without environmental exposure to tremolite. CONCLUSION Analysis of BALF gives information about fibre retention in populations environmentally exposed to erionite for whom data on fibre burden from lung tissue samples are scarce. This may apply to exposed Turks having emigrated to other countries.
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Affiliation(s)
- P Dumortier
- Chest Department, Hôpital Erasme, Université Libre de Bruxelles, Route de Lennik 808, B1070 Brussels, Belgium.
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Dumortier P, Coplü L, de Maertelaer V, Emri S, Baris I, De Vuyst P. Assessment of environmental asbestos exposure in Turkey by bronchoalveolar lavage. Am J Respir Crit Care Med 1998; 158:1815-24. [PMID: 9847273 DOI: 10.1164/ajrccm.158.6.9712119] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Environmental or domestic exposure to asbestos fibers originating from local soil is responsible for a high incidence of diseases in large rural areas of Turkey. Bronchoalveolar lavage fluids (BALF) were obtained for 65 Turkish subjects originating from these areas and for 42 Turkish controls. Asbestos bodies (ABs) and uncovered fibers (UFs) were quantified by phase contrast light microscopy. Total fiber burden was determined by transmission electron microscopy. The main asbestos types disclosed were tremolite and to a lesser extent chrysotile. AB and fiber concentrations were higher in environmentally exposed subjects (geometric mean [geometric standard deviation]: 5.20 [6.22] AB/ml, 444 [11.6] tremolite fibers/ml) than in control subjects (0.22 [1.45] AB/ml, 12.0 [15.4] tremolite fibers/ml) (p < 0.001). In subjects environmentally exposed in Turkey, AB burdens on tremolite were in the same range as those on commercial amphiboles in subjects occupationally exposed in Belgium. In Turkish subjects, values above either 1 AB/ml, 3 uncovered fiber/ml in light microscopy, or 300 fibers/ml in electron microscopy indicated usually an abnormal alveolar retention reflecting a significant cumulative exposure from environmental or domestic origin. These observations are probably valid for other areas in the world where diseases associated with environmental exposure to soil- derived asbestos fibers occur and for immigrants originating from these areas.
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Affiliation(s)
- P Dumortier
- Chest Department, Hôpital Erasme, and Biostatistics, IRIBHN, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium
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Emril S, Özdemir O, Karakoca Y, Çöplü L, Dündar S, Baris I. Plasma and pleural fluid analysis of fibrinolytic system in malignant pleural mesothelioma. Lung Cancer 1996. [DOI: 10.1016/0169-5002(96)81613-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Akhan O, Kalyoncu F, Ozmen MN, Demirkazik FB, Cekirge HS, Sahin A, Baris I. Peritoneal mesothelioma: sonographic findings in nine cases. Abdom Imaging 1993; 18:280-2. [PMID: 8508093 DOI: 10.1007/bf00198123] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Ultrasonographic findings in nine cases of peritoneal mesothelioma are presented. The most common findings were sheet-like or nodular peritoneal thickening, soft tissue masses, fixation of the intestinal loops, mesenteric thickening, and minimal ascites which was disproportional to the degree of tumor dissemination. The authors found that abdominal sonography, using 3.75-7.5 MHz transducers, is a useful imaging method for diagnosis of peritoneal mesothelioma in high-risk groups.
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Affiliation(s)
- O Akhan
- Department of Radiology, University of Hacettepe Faculty of Medicine, Ankara, Turkey
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Akhan O, Dincer A, Gököz A, Sayek I, Havlioglu S, Abbasoglu O, Eryilmaz M, Besim A, Baris I. Percutaneous treatment of abdominal hydatid cysts with hypertonic saline and alcohol. An experimental study in sheep. Invest Radiol 1993; 28:121-7. [PMID: 8444568 DOI: 10.1097/00004424-199302000-00008] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
RATIONALE AND OBJECTIVES Seven naturally infected sheep with proper hepatic and peritoneal hydatid cysts were studied to assess a new percutaneous approach for cystic hydatid disease. METHODS A needle was inserted into the cyst cavity of sheep under sonographic guidance. Immediately after instillation of hypertonic saline to inactivate protoscolices, ultrasound demonstrated that germinal and laminated membranes of the hydatid cysts were separated completely from the pericyst in all sheep. Later, a catheter was inserted into the cyst cavity using Seldinger technique. Alcohol was used as a sclerosing agent. RESULTS Ultrasound showed reduction in cyst size and progressive solidification. No anaphylactic reaction was observed. After sonographic follow-up that lasted from 1 to 26 weeks, the sheep were killed to evaluate macroscopic and histologic changes. At autopsy, no secondary cyst formation was seen. The appearance of treated cysts was different from the others, and there were signs of involution. The histologic sections did not show any viable protoscolices or daughter cysts. The authors observed pericyst hyalinization, inflammatory cells in the cyst wall, cyst wall necrosis, calcification of cyst wall, degeneration of laminated membrane, severe degeneration or absence of germinal membrane, and inflammatory cells and necrotic material in the cyst cavity. CONCLUSIONS Percutaneous treatment of hydatid disease was effective in the animal model. Ultrasound was useful in evaluating the intervention.
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Affiliation(s)
- O Akhan
- Department of Radiology, Hacettepe University School of Medicine, Ankara, Turkey
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Al-Quorain A, Ibrahim EM, Al-Ghassab G, Al-Mohana F, Baris I. Use of flexible fiberoptic bronchoscopy in pulmonary diseases--analysis of outcome and prediction of clinically useful studies. Indian J Chest Dis Allied Sci 1988; 30:167-75. [PMID: 3243598] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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40
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Al-Freihi HM, Al-Mohaya SA, Ibrahim EM, Al-Idrissi HY, Baris I. Extrapulmonary tuberculosis: diverse manifestations and diagnosis challenge. East Afr Med J 1987; 64:295-301. [PMID: 3436265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Baris I, Simonato L, Artvinli M, Pooley F, Saracci R, Skidmore J, Wagner C. Epidemiological and environmental evidence of the health effects of exposure to erionite fibres: a four-year study in the Cappadocian region of Turkey. Int J Cancer 1987; 39:10-7. [PMID: 3025107 DOI: 10.1002/ijc.2910390104] [Citation(s) in RCA: 178] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
An environmental and epidemiological study has been carried out in Central Cappadocia, Turkey, aiming at investigating the relationship between exposure to naturally occurring erionite fibres and the reported high incidence of malignant mesotheliomas. Airborne fibre levels are generally low but show a higher proportion of erionite fibres in the villages affected by malignant disease than in a control village. The same pattern is confirmed by analysis of the fibre content in lung tissues of sheep from several villages, both affected and unaffected by malignant disease. The 3 villages with the highest proportion of erionite fibres have high rates of malignant pleural mesothelioma, malignant peritoneal mesothelioma and lung cancer. No case of malignancy for the same sites has been reported during the study period from the control village. The relationships between these findings and their consistency with the results from experimental studies indicate erionite fibres as a carcinogenic agent, although some aspects of the exposure are not fully clarified.
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Baris I, Artvinli M, Sahin A, Savas T, Erkan ML. [Occurrence of pleural mesothelioma. Chronic fibrosing pleurisy and calcified pleural plaques in Turkey in relation with environmental pollution by mineral fibers (author's transl)]. Rev Fr Mal Respir 1979; 7:687-94. [PMID: 233434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The incidence of pleural mesothelioma (PM), chronic fibrosing pleurisy (CFP) and calcified pleural plaques (CPP) has been studied in Anatolia (Turkey) in relation with environmental pollution by mineral fibers: 1) In central Anatolia, where asbestos deposits have been described, the frequency of CFP and CPP was in the range 2-25%; several cases of PM have been encountered. 2) One area (Cappadoce) is free of asbestos, but contains another kind of mineral fiber: zeolite. In this area, an outbreak of PM has been described in some villages. Among the 600 inhabitants of Karain, 28 cases of PM occurred for the period January 1975-June 1979.
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Tezok F, Balci K, Baris I, Kurt C. [A case of diffuse pulmonary alveolar microlithiasis]. Rev Med Moyen Orient 1965; 22:447-50. [PMID: 5216717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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