35 results on '"Akman, H."'
Search Results
2. Macrocytic Anemia and Mitochondriopathy Resulting from a Defect in Sideroflexin 4
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Hildick-Smith, Gordon J, Cooney, Jeffrey D, Garone, Caterina, Kremer, Laura S, Haack, Tobias B, Thon, Jonathan N, Miyata, Non, Lieber, Daniel S, Calvo, Sarah E, Akman, H Orhan, Yien, Yvette Y, Huston, Nicholas C, Branco, Diana S, Shah, Dhvanit I, Freedman, Matthew L, Koehler, Carla M, Italiano, Joseph E, Merkenschlager, Andreas, Beblo, Skadi, Strom, Tim M, Meitinger, Thomas, Freisinger, Peter, Donati, M Alice, Prokisch, Holger, Mootha, Vamsi K, DiMauro, Salvatore, and Paw, Barry H
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Hematology ,Pediatric ,Adolescent ,Anemia ,Macrocytic ,Animals ,Child ,Erythropoiesis ,Exome ,Female ,Gene Knockdown Techniques ,Humans ,Membrane Proteins ,Mitochondrial Diseases ,Mitochondrial Proteins ,Mutation ,Zebrafish ,Biological Sciences ,Medical and Health Sciences ,Genetics & Heredity - Abstract
We used exome sequencing to identify mutations in sideroflexin 4 (SFXN4) in two children with mitochondrial disease (the more severe case also presented with macrocytic anemia). SFXN4 is an uncharacterized mitochondrial protein that localizes to the mitochondrial inner membrane. sfxn4 knockdown in zebrafish recapitulated the mitochondrial respiratory defect observed in both individuals and the macrocytic anemia with megaloblastic features of the more severe case. In vitro and in vivo complementation studies with fibroblasts from the affected individuals and zebrafish demonstrated the requirement of SFXN4 for mitochondrial respiratory homeostasis and erythropoiesis. Our findings establish mutations in SFXN4 as a cause of mitochondriopathy and macrocytic anemia.
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- 2013
3. O18: A path forward for patients with glycogen branching enzyme deficiency: Consensus on diagnosing and managing glycogen storage disease type IV*
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Koch, Rebecca, primary, Soler-Alfonso, Claudia, additional, Kiely, Bridget, additional, Asai, Akihiro, additional, Smith, Ariana, additional, Bali, Deeksha, additional, Kang, Peter, additional, Landstrom, Andrew, additional, Akman, H. Orhan, additional, Burrow, T. Andrew, additional, Orthmann-Murphy, Jennifer, additional, Goldman, Deberah, additional, Pendyal, Surekha, additional, El-Gharbawy, Areeg, additional, Austin, Stephanie, additional, Case, Laura, additional, Schiffmann, Raphael, additional, Hirano, Michio, additional, and Kishnani, Priya, additional
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- 2023
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4. Revisiting degron motifs in human AURKA required for its targeting by APC/CFZR1
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Abdelbaki, Ahmed, primary, Ascanelli, Camilla, additional, Okoye, Cynthia N, additional, Akman, H Begum, additional, Janson, Giacomo, additional, Min, Mingwei, additional, Marcozzi, Chiara, additional, Hagting, Anja, additional, Grant, Rhys, additional, De Luca, Maria, additional, Asteriti, Italia Anna, additional, Guarguaglini, Giulia, additional, Paiardini, Alessandro, additional, and Lindon, Catherine, additional
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- 2022
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5. A novel mouse model that recapitulates adult-onset glycogenosis type 4
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Orhan Akman, H., Emmanuele, Valentina, Kurt, Yasemin Gülcan, Kurt, Bülent, Sheiko, Tatiana, DiMauro, Salvatore, and Craigen, William J.
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- 2015
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6. Revisiting degron motifs in human AURKA required for its targeting by APC/CFZR1.
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Abdelbaki, Ahmed, Ascanelli, Camilla, Okoye, Cynthia N., Akman, H. Begum, Janson, Giacomo, Min, Mingwei, Marcozzi, Chiara, Hagting, Anja, Grant, Rhys, De Luca, Maria, Asteriti, Italia Anna, Guarguaglini, Giulia, Paiardini, Alessandro, and Lindon, Catherine
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- 2023
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7. GYS1 or PPP1R3C deficiency rescues murine adult polyglucosan body disease
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Chown, Erin E., primary, Wang, Peixiang, additional, Zhao, Xiaochu, additional, Crowder, Justin J., additional, Strober, Jordan W., additional, Sullivan, Mitchell A., additional, Xue, Yunlin, additional, Bennett, Cody S., additional, Perri, Ami M., additional, Evers, Bret M., additional, Roach, Peter J., additional, Depaoli‐Roach, Anna A., additional, Akman, H. Orhan, additional, Pederson, Bartholomew A., additional, and Minassian, Berge A., additional
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- 2020
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8. Bayes estimation in a mixture inverse Gaussian model
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Gupta, Ramesh C. and Akman, H. Olcay
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- 1995
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9. A comparative study of continuous positive airway pressure (CPAP) and intermittent positive pressure ventilation (IPPV) in patients with flail chest
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Gunduz, M., Unlugenc, H., Ozalevli, M., Inanoglu, K., and Akman, H.
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Respiratory insufficiency -- Care and treatment ,Respiratory insufficiency -- Research ,Lung diseases -- Care and treatment ,Lung diseases -- Research ,Health - Published
- 2005
10. AURKA destruction is decoupled from its activity at mitotic exit but essential to suppress interphase activity
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Abdelbaki, Ahmed, primary, Akman, H. Begum, additional, Poteau, Marion, additional, Grant, Rhys, additional, Gavet, Olivier, additional, Guarguaglini, Giulia, additional, and Lindon, Catherine, additional
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- 2020
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11. MFN2 mutations in Charcot–Marie–Tooth disease alter mitochondria-associated ER membrane function but do not impair bioenergetics
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Department of Defense (US), National Institutes of Health (US), J. Willard Marriott Foundation, American Parkinson Disease Association, Fondazione Cariparo, European Research Council, Wellcome Trust, Newton Fund, European Commission, Larrea, Delfina, Pera, Marta, Gonnelli, Adriano, Quintana-Cabrera, Ruben, Akman, H. Orhan, Guardia-Laguarta, Cristina, Velasco, Kevin R., Area-Gomez, Estela, Dal Bello, Federica, De Stefani, Diego, Horvath, Rita, Shy, Michael E., Schon, Eric A., Giacomello, Marta, Department of Defense (US), National Institutes of Health (US), J. Willard Marriott Foundation, American Parkinson Disease Association, Fondazione Cariparo, European Research Council, Wellcome Trust, Newton Fund, European Commission, Larrea, Delfina, Pera, Marta, Gonnelli, Adriano, Quintana-Cabrera, Ruben, Akman, H. Orhan, Guardia-Laguarta, Cristina, Velasco, Kevin R., Area-Gomez, Estela, Dal Bello, Federica, De Stefani, Diego, Horvath, Rita, Shy, Michael E., Schon, Eric A., and Giacomello, Marta
- Abstract
Charcot–Marie–Tooth disease (CMT) type 2A is a form of peripheral neuropathy, due almost exclusively to dominant mutations in the nuclear gene encoding the mitochondrial protein mitofusin-2 (MFN2). However, there is no understanding of the relationship of clinical phenotype to genotype. MFN2 has two functions: it promotes inter-mitochondrial fusion and mediates endoplasmic reticulum (ER)–mitochondrial tethering at mitochondria-associated ER membranes (MAM). MAM regulates a number of key cellular functions, including lipid and calcium homeostasis, and mitochondrial behavior. To date, no studies have been performed to address whether mutations in MFN2 in CMT2A patient cells affect MAM function, which might provide insight into pathogenesis. Using fibroblasts from three CMT2AMFN2 patients with different mutations in MFN2, we found that some, but not all, examined aspects of ER–mitochondrial connectivity and of MAM function were indeed altered, and correlated with disease severity. Notably, however, respiratory chain function in those cells was unimpaired. Our results suggest that CMT2AMFN2 is a MAM-related disorder but is not a respiratory chain-deficiency disease. The alterations in MAM function described here could also provide insight into the pathogenesis of other forms of CMT.
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- 2019
12. MFN2 mutations in Charcot–Marie–Tooth disease alter mitochondria-associated ER membrane function but do not impair bioenergetics
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Larrea, Delfina, primary, Pera, Marta, additional, Gonnelli, Adriano, additional, Quintana–Cabrera, Rubén, additional, Akman, H Orhan, additional, Guardia-Laguarta, Cristina, additional, Velasco, Kevin R, additional, Area-Gomez, Estela, additional, Dal Bello, Federica, additional, De Stefani, Diego, additional, Horvath, Rita, additional, Shy, Michael E, additional, Schon, Eric A, additional, and Giacomello, Marta, additional
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- 2019
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13. Guaiacol as a drug candidate for treating adult polyglucosan body disease
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Kakhlon, Or, primary, Ferreira, Igor, additional, Solmesky, Leonardo J., additional, Khazanov, Netaly, additional, Lossos, Alexander, additional, Alvarez, Rafael, additional, Yetil, Deniz, additional, Pampou, Sergey, additional, Weil, Miguel, additional, Senderowitz, Hanoch, additional, Escriba, Pablo, additional, Yue, Wyatt W., additional, and Akman, H. Orhan, additional
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- 2018
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14. Büyükbaş Hayvan Atıkları ile Sera Hasat Atıklarından Biyogaz Üretimi ve Birlikte Anaerobik Parçalanma Prosesinin Modellenmesi
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YILMAZ, Fatih, primary, KÖKDEMİR ÜNŞAR, Elçin, additional, AKMAN, H. Emre, additional, PERENDECİ, Nuriye Altınay, additional, and YALDIZ, Osman, additional
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- 2018
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15. Level of residual enzyme activity modulates the phenotype in phosphoglycerate kinase deficiency
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Vissing, John, Akman, H Orhan, Aasly, Jan, Kahler, Stephen G, Bacino, Carlos A, DiMauro, Salvatore, Haller, Ronald G, Vissing, John, Akman, H Orhan, Aasly, Jan, Kahler, Stephen G, Bacino, Carlos A, DiMauro, Salvatore, and Haller, Ronald G
- Abstract
OBJECTIVE: To study the variable clinical picture and exercise tolerance of patients with phosphoglycerate kinase (PGK) 1 deficiency and how it relates to residual PGK enzyme activity.METHODS: In this case series study, we evaluated 7 boys and men from 5 families with PGK1 deficiency. Five had pure muscle symptoms, while 2 also had mild intellectual disability with or without anemia. Muscle glycolytic and oxidative capacities were evaluated by an ischemic forearm exercise test and by cycle ergometry.RESULTS: Enzyme levels of PGK were 4% to 9% of normal in red cells and 5% to10% in muscle in pure myopathy patients and 2.6% in both muscle and red cells in the 2 patients with multisystem involvement. Patients with pure myopathy had greater increases in lactate with ischemic exercise (2-3 mmol/L) vs the 2 multisystem-affected patients (<1 mmol/L). Myopathy patients had higher oxidative capacity in cycle exercise vs multisystem affected patients (≈30 vs ≈15 mL/kg per minute). One multisystem-affected patient developed frank myoglobinuria after the short exercise test.CONCLUSIONS: This case series study of PGK1 deficiency suggests that the level of impaired glycolysis in PGK deficiency is a major determinant of phenotype. Lower glycolytic capacity in PGK1 deficiency seems to result in multisystem involvement and increased susceptibility to exertional rhabdomyolysis.
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- 2018
16. Alcam Is Indirectly Modulated By Mir-125B In Mcf7 Cells
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Akman, H. Begum, Selcuklu, S. Duygu, Donoghue, Mark T. A., Akhavantabasi, Shiva, Sapmaz, Aysegul, Spillane, Charles, Yakicier, M. Cengiz, and Erson-Bensan, A. Elif
- Abstract
MicroRNA (miRNA) deregulation is associated with various cancers. Among an expanding list of cancer-related miRNAs, deregulation of miR-125b has been well documented in many cancers including breast. Based on current knowledge, miR-125b is considered to be a tumor suppressor in breast cancers. While important messenger RNA (mRNA) targets have been defined for miR-125b, here, we aimed to further investigate direct/indirect consequences of miR-125b expression in breast cancer cells by using a transcriptome approach. Upon miR-125b expression, a total of 138 cancer-related genes were found to be differentially expressed in breast cancer cells. While only a few of these were predicted to be direct mRNA targets, majority of the gene expression changes were potentially downstream and indirect effects of miR-125b expression. Among these, activated leukocyte antigen molecule (ALCAM) mRNA and protein levels were found to be highly significantly increased upon miR-125b expression. Given the tumor suppressor role of miR-125b in our model system, upon silencing of ALCAM expression, cell proliferation rate re-increased in miR-125b-expressing cells. While ALCAM's possible context-dependent roles are not clear in breast cancer, a diverse expression pattern of ALCAM mRNA was detected in a panel of breast cancer patient samples. Differentially expressed/regulated cancer-related genes upon miR-125b expression along with the significant increase of ALCAM are of future interest to understand how deregulated expression of miR-125b may have a tumor suppressor role in breast and other cancers.
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- 2015
17. A new muscle glycogen storage disease associated with glycogenin-1 deficiency
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Malfatti, Edoardo, Nilsson, Johanna, Hedberg-Oldfors, Carola, Hernandez-Lain, Aurelio, Michel, Fabrice, Dominguez-Gonzalez, Cristina, Viennet, Gabriel, Akman, H Orhan, Kornblum, Cornelia, Van den Bergh, Peter, Romero, Norma B, Engel, Andrew G, DiMauro, Salvatore, Oldfors, Anders, Centre de recherche en myologie, Université Pierre et Marie Curie - Paris 6 (UPMC)-Association française contre les myopathies (AFM-Téléthon)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Columbia University Medical Center (CUMC), Columbia University [New York], UCL - SSS/IONS/NEUR - Clinical Neuroscience, and UCL - (SLuc) Service de neurologie
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Adult ,Male ,Middle Aged ,Glycogen Storage Disease ,Article ,Glycogen Synthase ,Glucosyltransferases ,Humans ,Female ,[SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC] ,Muscle, Skeletal ,Aged ,Glycoproteins - Abstract
International audience; We describe a slowly progressive myopathy in 7 unrelated adult patients with storage of polyglucosan in muscle fibers. Genetic investigation revealed homozygous or compound heterozygous deleterious variants in the glycogenin-1 gene (GYG1). Most patients showed depletion of glycogenin-1 in skeletal muscle, whereas 1 showed presence of glycogenin-1 lacking the C-terminal that normally binds glycogen synthase. Our results indicate that either depletion of glycogenin-1 or impaired interaction with glycogen synthase underlies this new form of glycogen storage disease that differs from a previously reported patient with GYG1 mutations who showed profound glycogen depletion in skeletal muscle and accumulation of glycogenin-1. Ann Neurol 2014;76:891–898
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- 2014
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18. Perakende Satılan Kıymaların Escherichia coli O157 Yönünden İncelenmesi
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ALİŞARLI, M. and AKMAN, H. N.
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- 2014
19. Optimum Solid Loading Rate for Biogas Production from Agricultural Wastes
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AKMAN, H. Emre, AKMAN, Ecehan, CIGGIN, Asli S., PERENDECİ, N. Altınay, and YALDIZ, Osman
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Agricultural wastes,biochemical methane production,solid loading rate - Abstract
Turkey was the fourth and third largest producer of tomato and pepper fromgreenhouses, respectively, according to FAO in 2012. The huge amount of agricultural wastesgenerated from the production of tomato and green pepper are served as renewable sources forenergy production via anaerobic digestion (AD) For efficiently biogas production, it is essential todetermine the operation conditions of AD such as solid loading rate (SLR) for target wastes.The aim of this study is to optimize SLR for optimum biogas production from tomato and greenpepper wastes. For this purpose, biochemical methane potential tests were carried out at 37 °Cwith 7% and 15% of SLRs. For supplying the nutritional requirements of AD process, cow manurewas also added as a 10% of the selected SLR. As the biogas production from tomato wastes wasnearly 75% increased with the increase in SLR from 15% to 7%., the optimum SLR wasdetermined as 7% for anaerobic digestion of tomato wastes. On the other hand, decreasing SLR ofpepper waste from 15% to 7% is resulted with only 11% decrease in biogas production. When theenergy revenue between the 7% and 15% SLRs is compared with disposal cost of nearly two-foldpepper wastes, suitable SLR for pepper wastes can be suggested as 15%. Consequently, theoptimum SLR for anaerobic digestion of tomato and pepper was determined as 7% and 15%,respectively.
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- 2014
20. Estrogen-induced upregulation and 3'-UTR shortening of CDC6
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Akman, H. Begüm, Erson Bensan, Ayşe Elif, and Biyoloji Anabilim Dalı
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Biology ,Biyoloji - Abstract
Alternatif poliadenilasyon (APA) farklı fizyolojik ve/veya hastalık durumlarında mRNA 3'-UTR'lerinin (translasyon olmayan bölge) kısalmasına neden olabilir. Memeli genlerinin yaklaşık yarısı alternatif kesilme ve poliadenilasyon ile 3'-UTR boyları değişen çeşitli mRNA izoformları oluşturabilirler. Sonuç olarak, mRNA'ların 3'-UTR'lerinin kısalmasının gen ifadesi açısından önemli sonuçları vardır. APA'nın hızlı büyüyen hücrelerde ve kanser hücrelerinde kullanılan bir mekanizma olduğu yakın zamanda anlaşılmıştır. APA ve 3'-UTR kısalması olaylarının kanser hücrelerinde ortaya çıkan birtakım proto-onkogen aktivasyonlarını açıklayabileceği düşünülmektedir. Çalışmamızda, bazı hücrelerin translasyon hızlarını arttırmak amacıyla proksimal poly(A) sitelerini tercih ettiklerine dayanarak, östrojen reseptör pozitif (ER+) meme kanseri hücre hatlarına östrojene (E2) bağlı olarak hızlı büyümeye olanak sağlayacak proksimal poly(A) sitelerinin tercih edilebileceğini düşündük. Bağımsız ifade mikroçiplerinde yapılan öncül prob-tabanlı analizler DNA replikasyonunda önemli bir regülatör olan CDC6'nın (Cell Division Cycle 6) E2 muamelesi sonrası ifadesinde artış ve 3'-UTR'sinde kısalma olduğuna işaret etmiştir. Takip eden deneylerde, CDC6'nın E2 ve ER'ye bağlı ifade artışı ve 3'-UTR kısalması, buna bağlı olarak CDC6 protein seviyesindeki ve BrdU eklenmesindeki artış doğrulanmıştır. Daha sonra yapılan miRNA bağlanma tahminleri ve dual-lusiferaz sonuçları CDC6'nın 3'-UTR'sinin kısalmasının 3'-UTR'a bağlı negatif regülasyonlardan kaçınmak amacıyla olduğuna işaret etmiştir. Sonuç olarak, E2'nin ER+ hücrelerde bölünmeyi tetikleyen etkisinin CDC6 APA'sını da etkilediğini göstermiş, ve de APA'nın komplike regülasyonuna yeni bir bakış açısı sağlanmıştır. E2 ile tetiklenen APA, E2'ye duyarlı gen ifade mekanizmaları açısından daha önceden gözden kaçan ancak çok önemli bir mekanızma olması muhtemeldir. Alternative polyadenylation (APA) may cause mRNA 3?-UTR (untranslated region) shortening in different physiological conditions and/or disease states. About half of mammalian genes use alternative cleavage and polyadenylation to generate multiple mRNA isoforms differing in their 3?-UTRs. Consequently, 3?-UTR shortening of mRNAs via APA has important consequences for gene expression. Studies showed that, by preferential use of proximal APA sites and switching to shorter 3?-UTRs, proliferating cells can avoid 3?-UTR dependent negative post-transcriptional regulations. Hence, such APA and 3?-UTR shortening events may explain the basis of some of the proto-oncogene activation cases observed in cancer cells. Based on the fact that certain cell types switch to more proximal poly(A) sites to rapidly increase translation rates by escaping from miRNAs, we hypothesized that upon estradiol (E2) treatment in estrogen receptor positive (ER+) breast cancer cells, such proximal poly(A) sites may be preferred to provide a rapid growth pattern. Initial probe based screen of independent expression arrays suggested upregulation and 3?-UTR shortening of an essential regulator of DNA replication, CDC6 (Cell Division Cycle 6), upon E2 treatment. Further investigations confirmed the E2 and ER dependent upregulation and 3?-UTR shortening of CDC6, which lead to increased CDC6 protein levels and higher BrdU incorporation. Consequently, miRNA binding predictions and dual luciferase assays suggested that 3?-UTR shortening of CDC6 was a likely mechanism to avoid 3?-UTR dependent negative regulations. In summary, we demonstrated CDC6 APA induction by the proliferative effect of E2 in ER+ cells and provided new insights into the complex regulation of APA. E2 induced APA is likely to be an important but previously overlooked mechanism of E2 responsive gene expression. 102
- Published
- 2013
21. A De Novo Mutation in MTND6 Causes Generalized Dystonia in 2 Unrelated Children
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Kurt, Yasemin Gulcan, primary, Çoku, Jorida, additional, Akman, H. Orhan, additional, Naini, Ali, additional, Lu, Jesheng, additional, Engelstad, Kristin, additional, Hirano, Michio, additional, De Vivo, Darryl C., additional, and DiMauro, Salvatore, additional
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- 2016
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22. Yurt dışı işgücü döviz transferlerinin Türkiye'nin büyümesine ve çeşitli ekonomik değişkenlerine etkilerinin analizi
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Akman, H. Vedat, Toktaş, Şule, and Finans ve Bankacılık Ana Bilim Dalı
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Foreign exchange ,Transfer ,Bankacılık ,Abroad ,Foreign exchange reserve ,Monetary transmission ,Growth ,Banking ,Economic growth ,Workers ,Financial effects - Abstract
Türkiye'den gerçekleşen yurt dışı işgücü göçünün Türkiye ekonomik büyümesine ve çeşitli ekonomik değişkenlerine döviz transferleri yoluyla etkisinin araştırılması bu çalışmanın ana konusudur. Yurt dışı göçten kaynaklanan döviz transferlerinin göç veren ülkelerin ekonomilerine etkileri üzerine literatür taraması mercek altına alınmıştır.Bu doğrultuda yurt dışı işgücü göçünün Türkiye'nin ekonomik büyümesini etkilediği kabul edilen bazı ekonomik değişkenlere etkisi, regresyon yöntemi ile analiz edilmiştir. Ampirik bulgulara dayalı ekonometrik analiz sonucu göçmen işgücü döviz girdisinin Türkiye'nin ekonomik büyümesi etkisinin istatistiksel olarak anlamsız ve önemsiz olduğu bulgusuna ulaşılmıştır. Buna göre bu tez yaygın olan algılamanın aksine Türkiye'den gerçekleşen göçün Türkiye'nin ekonomisi üzerinde önemli etkileri olmadığını ortaya koyarak halihazırdaki literatürü genişletmektedir.Yurt dışı işgücü göçünü döviz transferlerinin etkilediği çok sayıda ekonomik faktörler arasından (i) GSYİH, (ii) Cari İşlemler Açığı, (iii) Enflasyon, (iv) İşsizlik ve (v) Gini Katsayısı tanımlayıcı ve ekonometrik olarak incelenmiştir. Regresyon analizlerimizin güvenirliğini test etmek için değişkenler Augmented Dickey-Fuller birim kök testi ile sınanmıştır. Bu bağlamda bulduğumuz değerler çerçevesinde regresyon testlerimizin güvenilir olduğunu söyleyebiliriz. Tez çalışması bu hedef doğrultusunda özetle aşağıdaki dört bölümden oluşmaktadır.Tezin birinci bölümünde; öncelikle ekonomik büyümede yurt dışı işgücü göçü ile döviz transferleri faktörüne ve literatürüne genel bir bakıştan sonra, yurt dışı işgücü göçünün tanımı ve sınıflandırılması yapılmıştır. Ayrıca, yurt dışı işgücü göçü yaklaşımları, yurt dışı göç süreci ve tercih modelleri araştırılmıştır. Daha sonra, modelde kullanacağımız değişkenlerden eğitim ve gelir etkisi değişkeni incelenmiş; yurt dışı işgücü göçünün makro ve mikro belirleyicilerine yer verilmiştir.xiiiÇalışmanın ikinci bölümünde; yurt dışı işgücü göçü, işçi döviz transferleri ve ekonomik etkilerine, yurt dışı işgücü göçünün ekonomik büyümedeki rolüne, Türkiye'de yüksek öğretim öğrenci sayısı ve yurt dışı işgücü göçü arasında benzerlik gösteren ilişki ve işgücü göçünün döviz geri dönüşü fonksiyonu ile olduğu öngörülen negatif korelasyon incelenmiştir.Tezin üçüncü bölümünde; yurt dışı işgücü göçünün ekonomik ve ekonometrik analizi yapılmıştır. Bu çerçevede öncelikle işgücü arz ve talep dengesizliği, yurt dışı göç ve ticaret hacmi ilişkisi ve literatürdeki çalışmalar, yurt dışı işgücü döviz transferlerine yönelik yaklaşımların üzerinde durulmuştur. Daha sonra döviz havalelerini etkileyen faktörler olan; sosyo-ekonomik ve mali faktörler ve ayrıca bu ekonomik faktörlerin döviz transferleri ile olan ilişkisi ekonometrik olarak incelenmiştir. Bölümde son olarak; yurt dışı işgücü göçünü açıklayan kuramlara yer verilmiştir.Çalışmanın dördüncü bölümünde; yurt dışı işçi döviz transferlerinin Türkiye'nin çeşitli ekonomik değerlerine etkileri kurulan model ile regresyon yönteminden faydalanılarak analiz edilmiş, hipotezler test edilmiş, çıktılar değerlendirilmiş ve yorumlanmıştır.Çalışmanın ek kısmında, yüz yüze görüşme yöntemi ile üniversite öğrencileriyle yapılan yurt dışı işgücü göçü anketi değerlendirilmiş, çeşitli hipotezler sınanmış ve sonuçlar yorumlanmıştır. Bu çalışma Türkiye'den yurt dışına göçün, ülke ekonomisinin büyümesine doğrudan değil dolaylı olarak etkide bulunduğunu regresyon analizi yapan modelleri aracılığıyla ortaya koyarak literatüre güncel ve uygulamalı katkıda bulunmaktadır.Anahtar Kelimeler: Göç, İşçi Dövizleri, İtici-Çekici Güçler, Eğitim, İşsizlik, Enflasyon, Cari Açık, Gini Katsayısı, Regresyon Analizi The main subject of this study is to investigate the international labor migration and its impact on economic growth and selected economic variables of Turkey. The paper uses the time series regression analyses to determine the impact of remittances over the economic growth in Turkey while the sample survey tries to determine potential future out-migration.After an extensive literature screening, this study provides further insight into arguments relating to number of economic factors affecting international labor migration and remittances. The findings of the econometric analysis, which is based on empirical evidence, unveils that migrant labors remittances do not have any statistically significant effect on the economic growth of Turkey. Hence, in contrary to common consensus, this thesis expands the existing literature via revealing that there is not much impact of migration originating from Turkey on the Turkish economy.For Turkey this paper uses cross-section data for GDP, current account deficit, inflation, unemployment and the Gini coefficient which uses descriptive and econometric analyses to test between 1960-2009 data. In order to determine the reliability of our regression analyses this paper uses, unit root variables with time series and the Augmented Dickey-Fuller test. In this context, we find our test results very reliable. This thesis consists of four sections outlined below.The first part of the thesis is an overview of the literature, looking at the definition and classification of international migration. In this context, the paper investigates international labor migration, international migration process and the preferred economic model.xvThe second part of the study investigates the role of the international labor migration over the economic growth in Turkey, in relation to the number of students in higher education and the remittances with their economic impact on receiving countries.In the third section of the thesis; the time series regression findings with the help of the econometric model determines the impact of remittances over the economic growth of the Turkish economy.In the fourth section of the study; tapping into the Saat series regression method used in the model tells us the effects of overseas remittances over Turkish economic growth not to be significant. The time series regression findings show that remittance flow to Turkey have statistically meaningful but have no significant impact on growth.In the annex sample survey results are also assessed in connection with the regression analyses. Again, the time series regression findings show that remittance flow to Turkey have statistically meaningful but no significant impact on economic growth or potential future out-migration.Keywords: Workers Remittances, Immigration, Time Series Regression, Push and Pull Factors, Education, Unemployment, Inflation, Current Account Deficit, Gini Coefficient 192
- Published
- 2010
23. Structural analysis of a 50 KB region on 17q23
- Author
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Akman, H. Begüm, Erson Bensan, Ayşe Elif, and Biyoloji Anabilim Dalı
- Subjects
Genetics ,Genetik ,Biology ,Biyoloji ,Human - Abstract
17q23 amplikon bölgesi meme kanserinde amplifiye olan birçok bölgeden bir tanesidir.Bu tür amplikonlar gen amplifikasyonlarından dolayı aşırı ekspres edilen proto-onkogenleribarındırırlar. Meme kanseri hücre hatlarında ve meme tümörlerinde yapılmış olan kopya sayısıanalizleri amplikon içerisinde birçok birbirinden bağımsız bölgenin amplifiye olduğunubelirlemiştir, bu da bazı genlerin çoğalmak üzere seçilerek tümör oluşumu ve gelişiminekatkıda bulunduğunu göstermektedir.17q23 üzerindeki amplikonları karakterize etmek ve olası onkogenleri belirlemek içinçeşitli çalışmalar yapılmıştır. 17q23 amplikonunun çoğalmasının meme kanserinde rolünüanlamak amacıyla, bu amplikon üzerindeki belirlenmemiş genleri veya EST'leri (ExpressedSequence Tags-İfade edilen Dizi Etiketleri) karakterize etmek çok önemlidir. Bu çalışmada,insan (H.sapiens), şempanze (P.troglodytes) ve fare (M.musculus) genomlarının in silikoanalizleri diziler arsındaki homolijiyi araştırmak ve yeni genleri ortaya çıkarmak amacıylayapılmıştır.Bu çalışmanın amacı, TBX2 ve TBX4 genleri arasındaki 50 kb'lik bölgenin analiziedilmesi ve bu bölgede yeralan T02811 EST'sinin karakterizasyonudur. Bu üç memeliningenomlarının analizleri ve karşılaştırılması, 50 kb'lik genomik DNA dizisi ve bu bölgedeyeralan EST'ler kullanılarak çeşitli biyoinformatik araçlar (BLAST, Pipmaker, Vista,GENSCAN vs.) ile yapılmıştır. Elde edilen sonuçlar göstermektedir ki, 3 tür arasındahazırlanan homoloji haritasına ve EST'lerin pozisyonlarına göre bu bölgede henüztanımlanmamış çeşitli büyüklüklerde yeni genlerin olması mümkündür. Bu 50 kb'lik bölgede,henüz tanımlanmamış bir genin varlığına dair in siliko ve deneysel ipuçları belirledik. T02811transkriptini 313 bp'den 1423 bp'ye uzatmayı başardık.Bu yeni gen potensiyel bir onkogen adayı olup olmadığını bulmak için daha fazlakarakterizasyon çalışmaları yapılmalıdır. Amplikonlarda bulunan onkogen adaylarınınkarakterize edilmeleri, genomik amplikon bölgelerinin ve bu bölgelerin tümör oluşumundakirollerinin anlaşılması açısından önemlidir.Anahtar Kelimeler: Meme kanseri, 17q23, EST, T02811, İnsan, Şempanze, Fare 17q23 amplicon is one of the many chromosomal regions that undergo amplification inbreast tumors. Such amplicons harbor proto-oncogenes that may be overexpressed due to geneamplifications. Copy number analysis in breast cancer cell lines and breast tumors identifiedseveral independently amplified regions within the 17q23 amplicon, suggesting that a numberof genes are selected for amplification as they may independently contribute to tumorformation and progression.To characterize distinct amplicons on 17q23 and localize putative oncogenes, variousstudies are done on this region. In order to better understand the role of 17q23 amplification inbreast cancer, characterizing unidentified genes or ESTs (Expressed Sequence Tags) on the17q23 amplicon is crucial. In this study, in silico analysis of human (H.sapiens), chimpanzee(P.troglodytes), and mouse (M.musculus) genomes were performed to examine sequencehomology between these 3 species for the purpose of identifying novel genes.The objective of this study was to analyze a 50 kb region between TBX2 and TBX4genes and characterize the EST T02811 located on that region. Analysis and comparisons ofthese three genomes were established based on genomic sequences and availability of ESTswith gene prediction programs (BLAST, Pipmaker, Vista, GENSCAN etc.). Based on ourresults, we prepared a homology map between these 3 species, including positions of ESTsthat may indicate novel genes. In this 50 kb region, we found in silico and experimantalevidence for the presence of an unidentified gene. We managed to extend the 313 bp ESTT02811 size to 1423 bp which we think is as of yet incomplete.Further studies are needed to characterize this novel gene as a potential oncogenecandidate. Characterizing the roles of such candidate oncogenes in amplicons will provide abetter understanding of genomic amplicon regions and their roles in tumorigenesis.Keywords: Breast cancer, 17q23, EST, T02811, Human, Chimpanzee, Mouse 126
- Published
- 2007
24. Prenatal diagnosis of glycogen storage disease type IV
- Author
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Akman, H. Orhan Karadimas, Charalampos Gyftodimou, Yolanda and Grigoriadou, Maria Kokotas, Haris Konstantinidou, Anastasia and Anninos, Hector Patsouris, Efstratios Thaker, Harshwardhan M. and Kaplan, Jeffrey B. Besharat, Isaam Hatzikonstantinou, Konstantina Fotopoulos, Spyridon DiMauro, Salvatore and Petersen, Michael B.
- Subjects
congenital, hereditary, and neonatal diseases and abnormalities - Abstract
Background Glycogen storage disease type IV (GSD-IV) is a rare autosomal recessive disorder due to mutations in the GBE1 gene causing deficiency of the glycogen branching enzyme (GBE). Prenatal diagnosis has occasionally been performed by the measurement of the GBE activity in cultured chorionic villi (CV) cells. Methods Two unrelated probands with severe hypotonia at birth and death during the neonatal period were diagnosed with GSD-IV on the basis of postmortem histological findings. DNA analysis revealed truncating GBE1 mutations in both families. Results Prenatal diagnosis was performed in subsequent pregnancies by determination of branching enzyme activity and DNA analysis of CV or cultured amniocytes. Detailed autopsies of the affected fetuses at 14 and 24 weeks of gestation demonstrated intracellular inclusions of abnormal glycogen characteristic of GSD-IV. Conclusion Prenatal diagnosis of GSD-IV by DNA analysis is highly accurate in genetically confirmed cases. Copyright (C) 2006 John Wiley & Sons, Ltd.
- Published
- 2006
25. Neonatal neuromuscular variant of glycogen storage disease type IV: histopathological findings leading to the diagnosis
- Author
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Konstantinidou, AE Anninos, H Gyftodimou, Y Petersen, MB and Karadimas, C Fotopoulos, S Paraskevakou, H O Akman, H and DiMauro, S Patsouris, E
- Published
- 2006
26. A Case of Lupus Miliaris Disseminatus Faciei Treated with Isotretinoin
- Author
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Evliyaoglu, D, Erdogan, BS, Ergin, S, Akman, H, and Akbulut, M
- Subjects
Acne agminata ,lupus miliaris disseminatus faciei ,isotretinoin - Abstract
Lupus miliaris disseminatus faciei (acne agminata) a chronic papular eruption of the face is considered among the granulomatous diseases. This condition occurs in adults and adolescents of both sexes. It is rarely seen in elderly individuals. The cause and the pathogenesis are unknown., A 26 year old man with a history of facial papular eruption for 6 months duration is diagnosed as LMDF and treated with isotretinoin with a good clinical outcome.
- Published
- 2006
27. A new muscle glycogen storage disease associated with glycogenin-1 deficiency.
- Author
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UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie, Malfatti, Edoardo, Nilsson, Johanna, Hedberg-Oldfors, Carola, Hernandez-Lain, Aurelio, Michel, Fabrice, Dominguez-Gonzalez, Cristina, Viennet, Gabriel, Akman, H Orhan, Kornblum, Cornelia, Van den Bergh, Peter, Romero, Norma B, Engel, Andrew G, DiMauro, Salvatore, Oldfors, Anders, UCL - SSS/IONS/NEUR - Clinical Neuroscience, UCL - (SLuc) Service de neurologie, Malfatti, Edoardo, Nilsson, Johanna, Hedberg-Oldfors, Carola, Hernandez-Lain, Aurelio, Michel, Fabrice, Dominguez-Gonzalez, Cristina, Viennet, Gabriel, Akman, H Orhan, Kornblum, Cornelia, Van den Bergh, Peter, Romero, Norma B, Engel, Andrew G, DiMauro, Salvatore, and Oldfors, Anders
- Abstract
We describe a slowly progressive myopathy in 7 unrelated adult patients with storage of polyglucosan in muscle fibers. Genetic investigation revealed homozygous or compound heterozygous deleterious variants in the glycogenin-1 gene (GYG1). Most patients showed depletion of glycogenin-1 in skeletal muscle, whereas 1 showed presence of glycogenin-1 lacking the C-terminal that normally binds glycogen synthase. Our results indicate that either depletion of glycogenin-1 or impaired interaction with glycogen synthase underlies this new form of glycogen storage disease that differs from a previously reported patient with GYG1 mutations who showed profound glycogen depletion in skeletal muscle and accumulation of glycogenin-1.
- Published
- 2014
28. Muscle phosphorylase kinase deficiency:a neutral metabolic variant or a disease?
- Author
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Preisler, N, Orngreen, M C, Echaniz-Laguna, A, Laforet, P, Lonsdorfer-Wolf, E, Doutreleau, S, Geny, B, Akman, H O, Dimauro, S, Vissing, J, Preisler, N, Orngreen, M C, Echaniz-Laguna, A, Laforet, P, Lonsdorfer-Wolf, E, Doutreleau, S, Geny, B, Akman, H O, Dimauro, S, and Vissing, J
- Abstract
To examine metabolism during exercise in 2 patients with muscle phosphorylase kinase (PHK) deficiency and to further define the phenotype of this rare glycogen storage disease (GSD).
- Published
- 2012
29. A novel mouse model that recapitulates adult-onset glycogenosis type 4.
- Author
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Akman, H. Orhan, Emmanuele, Valentina, Kurt, Yasemin Gülcan, Kurt, Bülent, Sheiko, Tatiana, DiMauro, Salvatore, and Craigen, William J.
- Published
- 2015
- Full Text
- View/download PDF
30. Effects of mixture ratio of cow manure and greenhouse wastes on anaerobic co-digestion process.
- Author
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Akman, H. Emre, Akman, Ecehan, Ciggin, Asli S., Perendeci, N. Altınay, and Yaldız, Osman
- Subjects
- *
CATTLE manure , *ANAEROBIC digestion , *BIOGAS industry , *AGRICULTURAL wastes , *AGRICULTURAL economics - Abstract
The biogas production from the agricultural wastes is accepted as an eco-friendly solution for keeping up with increasing energy demand in the world. The cow manure which is produced in every farm is readily available source for biogas production via anaerobic digestion. The main limitation for biogas production from manure is the inhibition of anaerobic microorganisms resulted from the high ammonia/ammonium content of manure. The co-digestion of manure with agricultural wastes is frequently applied to cope with this limitation. This study aims to investigate the biogas production from the co-digestion of cow manure and greenhouse residues in different mixing ratios as input materials. Tomato and pepper wastes from greenhouses were selected as co-substrates and optimum mixing ratios for maximum biogas yield from co-digestion of cow manure with tomato and pepper wastes were determined as 55:45 and 25:75, respectively. Along with the biogas production, co-digestion kinetics was also evaluated for biogas production from cow manure and tomato with the help of well-known mathematical models. The results indicated that the co-digestion of cow manure with greenhouse wastes is a viable option for the biogas production. [ABSTRACT FROM AUTHOR]
- Published
- 2015
31. AURKA destruction is decoupled from its activity at mitotic exit but is essential to suppress interphase activity.
- Author
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Abdelbaki, Ahmed, Akman, H. Begum, Poteau, Marion, Grant, Rhys, Gavet, Olivier, Guarguaglini, Giulia, and Lindon, Catherine
- Subjects
- *
CELLS , *MITOSIS , *PHOSPHORYLATION , *UBIQUITINATION , *MITOCHONDRIA - Abstract
Activity of AURKA is controlled through multiple mechanisms including phosphorylation, ubiquitin-mediated degradation and allosteric interaction with TPX2. Activity peaks at mitosis, before AURKA is degraded during and after mitotic exit in a process strictly dependent on the APC/C coactivator FZR1. We used FZR1 knockout cells (FZR1KO) and a novel FRET-based AURKA biosensor to investigate how AURKA activity is regulated in the absence of destruction. We found that AURKA activity in FZR1KO cells dropped at mitotic exit as rapidly as in parental cells, despite absence of AURKA destruction. Unexpectedly, TPX2 was degraded normally in FZR1KO cells. Overexpression of an N-terminal TPX2 fragment sufficient for AURKA binding, but that is not degraded at mitotic exit, caused delay in AURKA inactivation. We conclude that inactivation of AURKA at mitotic exit is determined not by AURKA degradation but by degradation of TPX2 and therefore is dependent on CDC20 rather than FZR1. The biosensor revealed that FZR1 instead suppresses AURKA activity in interphase and is critically required for assembly of the interphase mitochondrial network after mitosis. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
32. Neuromuscular forms of glycogen branching enzyme deficiency
- Author
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Bruno, C., denise cassandrini, Assereto, S., Orhan Akman, H., Minetti, C., and Di Mauro, S.
- Subjects
Disease Models, Animal ,Glycogen Storage Disease Type IV ,Amino Acid Substitution ,Genotype ,1,4-alpha-Glucan Branching Enzyme ,Mutation ,Animals ,Humans ,Chromosomes, Human, Pair 3 ,Neuromuscular Diseases ,Muscle Glycogenoses ,Polymorphism, Single Nucleotide - Abstract
Deficiency of glycogen branching enzyme is causative of Glycogen Storage Disease type IV (GSD-IV), a rare autosomal recessive disorder of the glycogen synthesis, characterized by the accumulation of amylopectin-like polysaccharide, also known as polyglucosan, in almost all tissues. Its clinical presentation is variable and involves the liver or the neuromuscular system and different mutations in the GBE1 gene, located on chromosome 3, have been identified in both phenotypes. This review will addresses the neuromuscular clinical variants, focusing on the molecular genetics aspects of this disorder.
33. Van Yüzüncü Yıl Üniversitesi'nde lisans öğrenimi gören öğrencilerin ruhsal durumları ve ruhsal durumlarıyla gelecek beklentisi arasındaki ilişki
- Author
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Konan, Murat, Akman, H. Nevzat, and Halk Sağlığı Ana Bilim Dalı
- Subjects
Halk Sağlığı ,Psychiatry ,Mental health ,Public Health ,Psikiyatri ,University students - Abstract
Öz Yüzüncü Yıl Üniversitesinde lisans öğrenimi gören öğrencilerin ruhsal durumları ve ruhsal durumlarıyla gelecek beklentileri arasındaki ilişkiyi tespit etmek amacıyla gerçekleştirilen tanımlayıcı ve analitik yönleri olan epidemiyolojik araştırmaya toplam 739 öğrenci alınmıştır. Öğrencilere 32 sorudan oluşan sosyo kültürel özelliklerini belirlemeye yönelik bir anket ile 90 sorudan oluşan öğrencilerin ruhsal durumlarını tesbit etmeye yönelik S-C-L 90- R ölçeği uygulanmıştır. Araştırmada S-C-L 90-R ölçeğine göre öğrencilerin GSI puan ortalaması 1.05 (+0.027) olarak bulunmuş ve 739 öğrenciden 324 (%43.8) öğrencide psiko patoloji olabileceği tespit edilmiştir. Araştırmada öğrencilerin GSI>lhızı ve alt ölçek puanlarının cinsiyet, alkol ve sigara kullanma alışkanlıklarına göre anlamlı farklılık gösterdiği ve gelecekle ilgili beklenti ve kaygının ruh sağlıklarını önemli ölçüde etkilediği bulunmuştur. Anahtar Kelimeler: Üniversite öğrencileri, ruhsal durum, gelecek kaygısı II ABSTRACT A total of 739 students were included to an epidemiologic study that has descriptive and analytic aspects, performed in order to determine psychic status of the students attending to licance education at Yüzüncü Yıl University and to determine the relation between their psychic status and their hopes in future An inquiry that was formed from 32 questions was applied to the students in order to determine their socio-cultural properties and S-C-L 90-R scale was applied for determination of their psychic status. GSI point average in the studied students according to the S-C-L-90-R scale was found 1.05 and it was established that in 324 students (43.8%) of 739 students there may be a psychopathologic state. It was found that GSI>1 seed and subscale prints of the students in the stdy have shown significant difference in view of sex, alchol and smoking habits and that worries and hapes about the future have effected their psychic healts significantly. Key Words: University students, psychic satus, future worry. 99
- Published
- 1997
34. Sensor using a photo-acoustic absorption cell with two perpendicular acoustic resonators to analyze multiple molecules.
- Author
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Bayrakli I, Akman H, and Sari F
- Abstract
An ultra-high sensitivity multi-molecule sensor based on a photo-acoustic cell with two perpendicular acoustic resonators and a common microphone has been reported. In this work, a 4.5 µm distributed-feedback quantum cascade laser and a 1.5 µm external cavity diode laser (EC-DL) were used as optical excitation sources. Considering the spectral ranges of the lasers used, it is possible to analyze eight molecules ( Q C L : N
2 O and C O2 , EC-DL: H2 O , H2 S , N H3 , CO, C H4 , and C2 H2 ). The N2 O molecule was used to evaluate the performance of the photo-acoustic spectroscopy (PAS)-based sensor. A sensitivity of 0.073 V/ppm and a linearity of 0.99 were found by analyzing the PAS signal as a function of N2 O concentration at 2237.656 c m-1 . The long-term performance of the sensor was determined by performing an Allan deviation analysis. A minimum detection limit of 9.8 ppb for 90 s integration time was achieved. The simultaneous multi-trace gas detection capability was verified by measurement of N2 O , C O2 , and H2 O . Depending on the coarse/fine-tuning ranges of the lasers used, the number of molecules analyzed can be further increased. Such a sensor could provide simultaneous diagnosis of many diseases through an analysis of breath air and simultaneous monitoring of the most important greenhouse gases.- Published
- 2023
- Full Text
- View/download PDF
35. High-sensitivity biomedical sensor based on photoacoustic and cavity enhanced absorption spectroscopy with a new software platform for breath analysis.
- Author
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Bayrakli I, Akman H, and Sari F
- Subjects
- Biomarkers analysis, Environmental Monitoring instrumentation, Sensitivity and Specificity, Software, Biosensing Techniques, Breath Tests methods, Photoacoustic Techniques methods, Spectrum Analysis methods
- Abstract
An easy-to-use highly sensitive sensor is reported for trace gas analysis. A near-infrared fiber-coupled external cavity diode laser in combination with a photoacoustic spectroscopy cell and a cavity enhanced absorption spectroscopy cell is used for analysis of trace gases. A software platform for direct absorption and wavelength modulation spectroscopy is developed in order to identify and quantify the molecules and to achieve a higher signal-to-noise ratio. Considering all of these features, the main advantage of our system is to analyze two different samples simultaneously and quickly. Trace gas measurement is assessed, and a detection limit of 1.5 ppb at 6528.76 c m
-1 for ammonia is demonstrated. Furthermore, the sensor with our software platform can be easily used outside of the laboratory, for example, in hospitals.- Published
- 2021
- Full Text
- View/download PDF
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