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Jain S, Bakolitsa C, Brenner SE, Radivojac P, Moult J, Repo S, Hoskins RA, Andreoletti G, Barsky D, Chellapan A, Chu H, Dabbiru N, Kollipara NK, Ly M, Neumann AJ, Pal LR, Odell E, Pandey G, Peters-Petrulewicz RC, Srinivasan R, Yee SF, Yeleswarapu SJ, Zuhl M, Adebali O, Patra A, Beer MA, Hosur R, Peng J, Bernard BM, Berry M, Dong S, Boyle AP, Adhikari A, Chen J, Hu Z, Wang R, Wang Y, Miller M, Wang Y, Bromberg Y, Turina P, Capriotti E, Han JJ, Ozturk K, Carter H, Babbi G, Bovo S, Di Lena P, Martelli PL, Savojardo C, Casadio R, Cline MS, De Baets G, Bonache S, Díez O, Gutiérrez-Enríquez S, Fernández A, Montalban G, Ootes L, Özkan S, Padilla N, Riera C, De la Cruz X, Diekhans M, Huwe PJ, Wei Q, Xu Q, Dunbrack RL, Gotea V, Elnitski L, Margolin G, Fariselli P, Kulakovskiy IV, Makeev VJ, Penzar DD, Vorontsov IE, Favorov AV, Forman JR, Hasenahuer M, Fornasari MS, Parisi G, Avsec Z, Çelik MH, Nguyen TYD, Gagneur J, Shi FY, Edwards MD, Guo Y, Tian K, Zeng H, Gifford DK, Göke J, Zaucha J, Gough J, Ritchie GRS, Frankish A, Mudge JM, Harrow J, Young EL, Yu Y, Huff CD, Murakami K, Nagai Y, Imanishi T, Mungall CJ, Jacobsen JOB, Kim D, Jeong CS, Jones DT, Li MJ, Guthrie VB, Bhattacharya R, Chen YC, Douville C, Fan J, Kim D, Masica D, Niknafs N, Sengupta S, Tokheim C, Turner TN, Yeo HTG, Karchin R, Shin S, Welch R, Keles S, Li Y, Kellis M, Corbi-Verge C, Strokach AV, Kim PM, Klein TE, Mohan R, Sinnott-Armstrong NA, Wainberg M, Kundaje A, Gonzaludo N, Mak ACY, Chhibber A, Lam HYK, Dahary D, Fishilevich S, Lancet D, Lee I, Bachman B, Katsonis P, Lua RC, Wilson SJ, Lichtarge O, Bhat RR, Sundaram L, Viswanath V, Bellazzi R, Nicora G, Rizzo E, Limongelli I, Mezlini AM, Chang R, Kim S, Lai C, O’Connor R, Topper S, van den Akker J, Zhou AY, Zimmer AD, Mishne G, Bergquist TR, Breese MR, Guerrero RF, Jiang Y, Kiga N, Li B, Mort M, Pagel KA, Pejaver V, Stamboulian MH, Thusberg J, Mooney SD, Teerakulkittipong N, Cao C, Kundu K, Yin Y, Yu CH, Kleyman M, Lin CF, Stackpole M, Mount SM, Eraslan G, Mueller NS, Naito T, Rao AR, Azaria JR, Brodie A, Ofran Y, Garg A, Pal D, Hawkins-Hooker A, Kenlay H, Reid J, Mucaki EJ, Rogan PK, Schwarz JM, Searls DB, Lee GR, Seok C, Krämer A, Shah S, Huang CV, Kirsch JF, Shatsky M, Cao Y, Chen H, Karimi M, Moronfoye O, Sun Y, Shen Y, Shigeta R, Ford CT, Nodzak C, Uppal A, Shi X, Joseph T, Kotte S, Rana S, Rao A, Saipradeep VG, Sivadasan N, Sunderam U, Stanke M, Su A, Adzhubey I, Jordan DM, Sunyaev S, Rousseau F, Schymkowitz J, Van Durme J, Tavtigian SV, Carraro M, Giollo M, Tosatto SCE, Adato O, Carmel L, Cohen NE, Fenesh T, Holtzer T, Juven-Gershon T, Unger R, Niroula A, Olatubosun A, Väliaho J, Yang Y, Vihinen M, Wahl ME, Chang B, Chong KC, Hu I, Sun R, Wu WKK, Xia X, Zee BC, Wang MH, Wang M, Wu C, Lu Y, Chen K, Yang Y, Yates CM, Kreimer A, Yan Z, Yosef N, Zhao H, Wei Z, Yao Z, Zhou F, Folkman L, Zhou Y, Daneshjou R, Altman RB, Inoue F, Ahituv N, Arkin AP, Lovisa F, Bonvini P, Bowdin S, Gianni S, Mantuano E, Minicozzi V, Novak L, Pasquo A, Pastore A, Petrosino M, Puglisi R, Toto A, Veneziano L, Chiaraluce R, Ball MP, Bobe JR, Church GM, Consalvi V, Cooper DN, Buckley BA, Sheridan MB, Cutting GR, Scaini MC, Cygan KJ, Fredericks AM, Glidden DT, Neil C, Rhine CL, Fairbrother WG, Alontaga AY, Fenton AW, Matreyek KA, Starita LM, Fowler DM, Löscher BS, Franke A, Adamson SI, Graveley BR, Gray JW, Malloy MJ, Kane JP, Kousi M, Katsanis N, Schubach M, Kircher M, Mak ACY, Tang PLF, Kwok PY, Lathrop RH, Clark WT, Yu GK, LeBowitz JH, Benedicenti F, Bettella E, Bigoni S, Cesca F, Mammi I, Marino-Buslje C, Milani D, Peron A, Polli R, Sartori S, Stanzial F, Toldo I, Turolla L, Aspromonte MC, Bellini M, Leonardi E, Liu X, Marshall C, McCombie WR, Elefanti L, Menin C, Meyn MS, Murgia A, Nadeau KCY, Neuhausen SL, Nussbaum RL, Pirooznia M, Potash JB, Dimster-Denk DF, Rine JD, Sanford JR, Snyder M, Cote AG, Sun S, Verby MW, Weile J, Roth FP, Tewhey R, Sabeti PC, Campagna J, Refaat MM, Wojciak J, Grubb S, Schmitt N, Shendure J, Spurdle AB, Stavropoulos DJ, Walton NA, Zandi PP, Ziv E, Burke W, Chen F, Carr LR, Martinez S, Paik J, Harris-Wai J, Yarborough M, Fullerton SM, Koenig BA, McInnes G, Shigaki D, Chandonia JM, Furutsuki M, Kasak L, Yu C, Chen R, Friedberg I, Getz GA, Cong Q, Kinch LN, Zhang J, Grishin NV, Voskanian A, Kann MG, Tran E, Ioannidis NM, Hunter JM, Udani R, Cai B, Morgan AA, Sokolov A, Stuart JM, Minervini G, Monzon AM, Batzoglou S, Butte AJ, Greenblatt MS, Hart RK, Hernandez R, Hubbard TJP, Kahn S, O’Donnell-Luria A, Ng PC, Shon J, Veltman J, Zook JM. CAGI, the Critical Assessment of Genome Interpretation, establishes progress and prospects for computational genetic variant interpretation methods. Genome Biol 2024; 25:53. [PMID: 38389099 PMCID: PMC10882881 DOI: 10.1186/s13059-023-03113-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2023] [Accepted: 11/17/2023] [Indexed: 02/24/2024] Open
Abstract
BACKGROUND The Critical Assessment of Genome Interpretation (CAGI) aims to advance the state-of-the-art for computational prediction of genetic variant impact, particularly where relevant to disease. The five complete editions of the CAGI community experiment comprised 50 challenges, in which participants made blind predictions of phenotypes from genetic data, and these were evaluated by independent assessors. RESULTS Performance was particularly strong for clinical pathogenic variants, including some difficult-to-diagnose cases, and extends to interpretation of cancer-related variants. Missense variant interpretation methods were able to estimate biochemical effects with increasing accuracy. Assessment of methods for regulatory variants and complex trait disease risk was less definitive and indicates performance potentially suitable for auxiliary use in the clinic. CONCLUSIONS Results show that while current methods are imperfect, they have major utility for research and clinical applications. Emerging methods and increasingly large, robust datasets for training and assessment promise further progress ahead.
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Ozturk K, Panwala R, Sheen J, Ford K, Payne N, Zhang DE, Hutter S, Haferlach T, Ideker T, Mali P, Carter H. Interface-guided phenotyping of coding variants in the transcription factor RUNX1 with SEUSS. bioRxiv 2023:2023.08.03.551876. [PMID: 37577681 PMCID: PMC10418284 DOI: 10.1101/2023.08.03.551876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Understanding the consequences of single amino acid substitutions in cancer driver genes remains an unmet need. Perturb-seq provides a tool to investigate the effects of individual mutations on cellular programs. Here we deploy SEUSS, a Perturb-seq like approach, to generate and assay mutations at physical interfaces of the RUNX1 Runt domain. We measured the impact of 115 mutations on RNA profiles in single myelogenous leukemia cells and used the profiles to categorize mutations into three functionally distinct groups: wild-type (WT)-like, loss-of-function (LOF)-like and hypomorphic. Notably, the largest concentration of functional mutations (non-WT-like) clustered at the DNA binding site and contained many of the more frequently observed mutations in human cancers. Hypomorphic variants shared characteristics with loss of function variants but had gene expression profiles indicative of response to neural growth factor and cytokine recruitment of neutrophils. Additionally, DNA accessibility changes upon perturbations were enriched for RUNX1 binding motifs, particularly near differentially expressed genes. Overall, our work demonstrates the potential of targeting protein interaction interfaces to better define the landscape of prospective phenotypes reachable by amino acid substitutions.
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Ozturk K, Carter H. Publisher Correction: Predicting functional consequences of mutations using molecular interaction network features. Hum Genet 2022; 141:1593. [PMID: 36151408 PMCID: PMC9522748 DOI: 10.1007/s00439-022-02492-3] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Kivilcim Ozturk
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, USA
- Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA
| | - Hannah Carter
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, USA.
- Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA.
- Moores Cancer Center, University of California San Diego, La Jolla, CA, USA.
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Ozturk K, Carter H. Predicting functional consequences of mutations using molecular interaction network features. Hum Genet 2021; 141:1195-1210. [PMID: 34432150 PMCID: PMC8873243 DOI: 10.1007/s00439-021-02329-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Accepted: 07/31/2021] [Indexed: 12/13/2022]
Abstract
Variant interpretation remains a central challenge for precision medicine. Missense variants are particularly difficult to understand as they change only a single amino acid in a protein sequence yet can have large and varied effects on protein activity. Numerous tools have been developed to identify missense variants with putative disease consequences from protein sequence and structure. However, biological function arises through higher order interactions among proteins and molecules within cells. We therefore sought to capture information about the potential of missense mutations to perturb protein interaction networks by integrating protein structure and interaction data. We developed 16 network-based annotations for missense mutations that provide orthogonal information to features classically used to prioritize variants. We then evaluated them in the context of a proven machine-learning framework for variant effect prediction across multiple benchmark datasets to demonstrate their potential to improve variant classification. Interestingly, network features resulted in larger performance gains for classifying somatic mutations than for germline variants, possibly due to different constraints on what mutations are tolerated at the cellular versus organismal level. Our results suggest that modeling variant potential to perturb context-specific interactome networks is a fruitful strategy to advance in silico variant effect prediction.
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Affiliation(s)
- Kivilcim Ozturk
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, USA.,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA
| | - Hannah Carter
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, USA. .,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, USA. .,Moores Cancer Center, University of California San Diego, La Jolla, CA, USA.
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Ozturk K, Nascene D. Susceptibility-Weighted Imaging of the Pediatric Brain after Repeat Doses of Gadolinium-Based Contrast Agent. AJNR Am J Neuroradiol 2021; 42:1136-1143. [PMID: 33888459 DOI: 10.3174/ajnr.a7143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 12/17/2020] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Gadolinium complexes have paramagnetic properties; thus, we aimed to determine the susceptibility changes in the globus pallidus and dentate nucleus following administration of linear or macrocyclic gadolinium-based contrast agents in children. MATERIALS AND METHODS Thirty-three patients with linear gadolinium-based contrast agent gadopentetate dimeglumine administration, 33 age- and sex-matched patients with macrocyclic gadolinium-based contrast agent gadobutrol administration, and 33 age- and sex-matched control subjects without gadolinium exposure were enrolled in this retrospective study. The signal intensity on SWI and T1WI was determined in the dentate nucleus, middle cerebellar peduncle, globus pallidus, and pulvinar of the thalamus in an ROI-based analysis to calculate dentate nucleus-to-middle cerebellar peduncle and globus pallidus-to-thalamus ratios. A repeated measures ANOVA was performed to compare SWIminimum, SWImean, and T1WI signal intensity ratios between gadolinium-based contrast agent groups and control subjects. Pearson correlation analysis was performed to determine any correlation between signal intensity ratios and variables. RESULTS Dentate nucleus-to-middle cerebellar peduncle and globus pallidus-to-thalamus ratios for both SWImean and SWIminimum were lower for the linear gadolinium-based contrast agent group compared with macrocyclic gadolinium-based contrast agent and control groups (P < .05). No significant difference of the SWImean and SWIminimum ratios were noted between the macrocyclic gadolinium-based contrast agent group and the control group (P > .05). Both dentate nucleus-to-middle cerebellar peduncle and globus pallidus-to-thalamus ratios on T1WI in the linear gadolinium-based contrast agent group were higher than in the control group and the macrocyclic gadolinium-based contrast agent group (P < .05). A negative correlation was identified between SWImean and SWIminimum ratios and the number of linear gadolinium-based contrast agent administrations (dentate nucleus-to-middle cerebellar peduncle ratio: SWImean, r = -0.43, P = .005; SWIminimum, r = -0.38, P = .011; globus pallidus-to-thalamus ratio: SWImean, r = -0.39, P = .009; SWIminimum, r = -0.33, P = .017). CONCLUSIONS SWI analysis of the pediatric brain demonstrated a statistically significant decrease in SWIminimum and SWImean values for the dentate nucleus and globus pallidus after administration of linear gadolinium-based contrast agents but not macrocyclic gadolinium-based contrast agents.
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Affiliation(s)
- K Ozturk
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
| | - D Nascene
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
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Castro A, Ozturk K, Zanetti M, Carter H. In silico analysis suggests less effective MHC-II presentation of SARS-CoV-2 RBM peptides: Implication for neutralizing antibody responses. PLoS One 2021; 16:e0246731. [PMID: 33571241 PMCID: PMC7877779 DOI: 10.1371/journal.pone.0246731] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 01/25/2021] [Indexed: 12/27/2022] Open
Abstract
SARS-CoV-2 antibodies develop within two weeks of infection, but wane relatively rapidly post-infection, raising concerns about whether antibody responses will provide protection upon re-exposure. Here we revisit T-B cooperation as a prerequisite for effective and durable neutralizing antibody responses centered on a mutationally constrained RBM B cell epitope. T-B cooperation requires co-processing of B and T cell epitopes by the same B cell and is subject to MHC-II restriction. We evaluated MHC-II constraints relevant to the neutralizing antibody response to a mutationally-constrained B cell epitope in the receptor binding motif (RBM) of the spike protein. Examining common MHC-II alleles, we found that peptides surrounding this key B cell epitope are predicted to bind poorly, suggesting a lack MHC-II support in T-B cooperation, impacting generation of high-potency neutralizing antibodies in the general population. Additionally, we found that multiple microbial peptides had potential for RBM cross-reactivity, supporting previous exposures as a possible source of T cell memory.
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Affiliation(s)
- Andrea Castro
- Biomedical Informatics Program, University of California San Diego, La Jolla, CA, United States of America
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - Kivilcim Ozturk
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
| | - Maurizio Zanetti
- The Laboratory of Immunology, Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
- Moores Cancer Center, University of California San Diego, La Jolla, CA, United States of America
| | - Hannah Carter
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, United States of America
- Moores Cancer Center, University of California San Diego, La Jolla, CA, United States of America
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Ozturk K, Spano A, Nascene D. Evaluation of anatomical landmark position differences for head computed tomography: A reliability study among technologists. Radiography (Lond) 2021; 27:773-778. [PMID: 33384208 DOI: 10.1016/j.radi.2020.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 08/09/2020] [Revised: 12/03/2020] [Accepted: 12/12/2020] [Indexed: 10/22/2022]
Abstract
INTRODUCTION In computed tomography (CT) imaging protocols, lack of practice standards and variability in head positioning may all yield substantial inter-study image variance in the clinical setting which may limit the diagnostic and comparative value of subsequent scans. We aimed to evaluate repeatability of multiplanar reformatting of head CT based on the tuberculum sella (TS) to internal occipital protuberance (IOP) reference line and reduce variance. METHODS Reference lines that correspond to the TS-IOP plane on high-resolution CT scans were reviewed by technologists manually to calculate Yaw (z-rotation, rotation along the superoinferior direction), Pitch (x-rotation, rotation along the left-right direction), and Roll (y-rotation, rotation along the anteroposterior direction) angles in this pre-post design intervention study. The Yaw, Pitch, and Roll angles deviating from the reference TS-IOP in the head CT images before and after technologist training were measured with the technologists' actual graphical prescriptions, and their differences were calculated with t-tests. The intra-rater agreement was calculated using the intraclass correlation coefficient (ICC). RESULTS Mean pitch, yaw, and roll before technologist training was 6.7° ± 5.4°, 0.9° ± 1.5°, and 1.1° ± 1.2° and after training were 3.2° ± 2.6°, 0.6° ± 1.1°, and 0.6° ± 1.1°, respectively. Technologist training resulted in a significant decrease in pitch (p < 0.001) and roll (p = 0.001) inter-subject variability with respect to the TS-IOP line, however no significant difference for the yaw correction (p = 0.065) was noted. Intra-rater agreement regarding the reproducibility of TS-IOP reformation was excellent (ICC>0.950). CONCLUSION TS-IOP reference line corrected for direct roll, yaw, and pitch can be readily achieved by trained technologists. IMPLICATIONS FOR PRACTICE Adoption of the TS-IOP reference line should facilitate intra- and intermodality comparisons, leading to more reproducible and readily interpretable CT images.
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Affiliation(s)
- K Ozturk
- Department of Radiology, University of Minnesota, Minneapolis, MN, 55455, USA.
| | - A Spano
- Department of Radiology, University of Minnesota, Minneapolis, MN, 55455, USA
| | - D Nascene
- Department of Radiology, University of Minnesota, Minneapolis, MN, 55455, USA
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Castro A, Ozturk K, Zanetti M, Carter H. MHC-II constrains the natural neutralizing antibody response to the SARS-CoV-2 spike RBM in humans. bioRxiv 2020:2020.12.26.424449. [PMID: 33398284 PMCID: PMC7781323 DOI: 10.1101/2020.12.26.424449] [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] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
SARS-CoV-2 antibodies develop within two weeks of infection, but wane relatively rapidly post-infection, raising concerns about whether antibody responses will provide protection upon re-exposure. Here we revisit T-B cooperation as a prerequisite for effective and durable neutralizing antibody responses centered on a mutationally constrained RBM B cell epitope. T-B cooperation requires co-processing of B and T cell epitopes by the same B cell and is subject to MHC-II restriction. We evaluated MHC-II constraints relevant to the neutralizing antibody response to a mutationally-constrained B cell epitope in the receptor binding motif (RBM) of the spike protein. Examining common MHC-II alleles, we found that peptides surrounding this key B cell epitope are predicted to bind poorly, suggesting a lack MHC-II support in T-B cooperation, impacting generation of high-potency neutralizing antibodies in the general population. Additionally, we found that multiple microbial peptides had potential for RBM cross-reactivity, supporting previous exposures as a possible source of T cell memory.
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Affiliation(s)
- Andrea Castro
- Biomedical Informatics Program, University of California San Diego, La Jolla, CA 92093, USA
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA
| | - Kivilcim Ozturk
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA
| | - Maurizio Zanetti
- The Laboratory of Immunology, Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
- Moores Cancer Center, University of California San Diego, La Jolla, CA 92093, USA
| | - Hannah Carter
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA
- Moores Cancer Center, University of California San Diego, La Jolla, CA 92093, USA
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Chen K, Ozturk K, Contreras RL, Simon J, McCann S, Chen WJ, Carter H, Fraley SI. Phenotypically supervised single-cell sequencing parses within-cell-type heterogeneity. iScience 2020; 24:101991. [PMID: 33490901 PMCID: PMC7808958 DOI: 10.1016/j.isci.2020.101991] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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: 09/29/2020] [Revised: 11/12/2020] [Accepted: 12/21/2020] [Indexed: 02/08/2023] Open
Abstract
To better understand cellular communication driving diverse behaviors, we need to uncover the molecular mechanisms of within-cell-type functional heterogeneity. While single-cell RNA sequencing (scRNAseq) has advanced our understanding of cell heterogeneity, linking individual cell phenotypes to transcriptomic data remains challenging. Here, we used a phenotypic cell sorting technique to ask whether phenotypically supervised scRNAseq analysis (pheno-scRNAseq) can provide more insight into heterogeneous cell behaviors than unsupervised scRNAseq. Using a simple 3D in vitro breast cancer (BRCA) model, we conducted pheno-scRNAseq on invasive and non-invasive cells and compared the results to phenotype-agnostic scRNAseq analysis. Pheno-scRNAseq identified unique and more selective differentially expressed genes than unsupervised scRNAseq analysis. Functional studies validated the utility of pheno-scRNAseq in understanding within-cell-type functional heterogeneity and revealed that migration phenotypes were coordinated with specific metabolic, proliferation, stress, and immune phenotypes. This approach lends new insight into the molecular systems underlying BRCA cell phenotypic heterogeneity.
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Affiliation(s)
- Kevin Chen
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Kivilcim Ozturk
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA.,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA 92093, USA
| | - Ryne L Contreras
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Jessica Simon
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Sean McCann
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Wei Ji Chen
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Hannah Carter
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA.,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA 92093, USA.,Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
| | - Stephanie I Fraley
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, USA.,Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
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Ozturk K, Carter H. Abstract 4403: Predicting therapeutic sensitivities from molecular interaction network rewiring of RUNX1-RUNX1T1 fusion. Cancer Res 2020. [DOI: 10.1158/1538-7445.am2020-4403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Cancer driver events are thought to converge on a subset of molecular systems that regulate the hallmark behaviors of cancer cells. However, the complexity of biological systems makes it difficult to evaluate the impact of individual mutations at the level of such cellular processes and behaviors. In order to overcome this, we propose to study the effects of cancer mutations by modeling them as perturbations to molecular network architectures, allowing network-based prediction of drug sensitivities.
We first built the infrastructure to study protein-protein interaction network rewiring by variants by mapping different classes of variants onto edges of the PPI network using protein structure information. Mutations that cause a larger disruption to the underlying network architecture can create more vulnerabilities that can be used as drug targets. Therefore, in this project we decided to focus on fusion events which can interfere with many interactions of their parent proteins. In order to assess the disruption that can be caused by fusion events, we collected 2,699 cancer fusion proteins and demonstrated the centrality of their parents within a high confidence human PPI network of 12,047 proteins. This indicates that the parent proteins of fusion genes tend to interact with more protein partners and are more likely to display network topological properties suggesting a role in information transduction in molecular interaction networks.
As leukemias are often impacted by chromosomal aberrations that can result in fusion and tend to harbor fewer somatic mutations than solid tumors, they provide a good setting to develop a network-based model to study fusion events in the context of drug responses. Therefore, we chose to study the RUNX1-RUNX1T1 translocation, t(8;21)(q22;q22), in AML which is thought to be a pre-leukemic event that can result in tumors after receiving additional mutations. This translocation replaces the transactivation domain of RUNX1 with most of the RUNX1T1 protein which changes its function as an essential transcriptional activator of hematopoiesis.
In order to study the transcriptional effects of RUNX1-RUNX1T1 fusion on the underlying interactome network architecture, U937T cells induced with RUNX1-RUNX1T1 fusion were grown in triplicate and RNA was harvested prior to induction and at certain times post-induction. Wild type U937T cells with no perturbation serve as negative control. RNA sequencing was performed, followed by alignment of the reads to the reference genome. A differential gene expression analysis showed that 1,582 genes are differentially expressed in fusion induced cells versus wild type at FDR<0.05, among which 47 of them encode proteins in RUNX1-RUNX1T1 subnetwork. Gene set enrichment analysis using these genes revealed that 30 gene sets are significantly enriched at nominal p-value<0.01.
Citation Format: Kivilcim Ozturk, Hannah Carter. Predicting therapeutic sensitivities from molecular interaction network rewiring of RUNX1-RUNX1T1 fusion [abstract]. In: Proceedings of the Annual Meeting of the American Association for Cancer Research 2020; 2020 Apr 27-28 and Jun 22-24. Philadelphia (PA): AACR; Cancer Res 2020;80(16 Suppl):Abstract nr 4403.
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Ozturk K, Rykken J, McKinney AM. Pediatric Acute Toxic Leukoencephalopathy: Prediction of the Clinical Outcome by FLAIR and DWI for Various Etiologies. AJNR Am J Neuroradiol 2020; 41:1517-1524. [PMID: 32616577 DOI: 10.3174/ajnr.a6624] [Citation(s) in RCA: 1] [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] [Received: 03/19/2020] [Accepted: 04/30/2020] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Pediatric acute toxic leukoencephalopathy is a clinicoradiologic entity comprising various etiologies. This study aimed to identify the MR imaging appearance of pediatric acute toxic leukoencephalopathy from various etiologies and determine whether the etiology correlates with clinical outcome. MATERIALS AND METHODS We retrospectively reviewed the electronic records of patients with pediatric acute toxic leukoencephalopathy younger than 19 years of age who had MR imaging within <2 weeks of presentation, including DWI and FLAIR sequences. Two neuroradiologists scored the DWI and FLAIR severity and measured the percentage ADC reduction within the visibly affected regions and normal-appearing WM. The percentage ADC reduction and DWI and FLAIR severity were correlated with clinical outcome using the Spearman correlation. RESULTS Of 22 children, 3 were excluded due to a nontoxic cause or incomplete examination. Regarding the included 19 children (mean age, 13 years), the etiologies of pediatric acute toxic leukoencephalopathy were the following: methotrexate (n = 6), bone marrow transplantation (n = 4), fludarabine (n = 3), cytarabine (n = 1), carboplatin (n = 1), vincristine (n = 1), cyclosporine (n = 1), uremia (n = 1), and bevacizumab (n = 1). Three subgroups were analyzed (chemotherapy, n = 12; immunosuppression, n = 5; others, n = 2). There was a strong correlation of FLAIR (r = 0.773, P < .001) and DWI (r = 0.851, P < .001) severity with clinical outcome, and patients treated with fludarabine had the worst outcomes. High percentage ADC reduction values were associated with adverse outcomes, and lower percentage ADC reduction values were associated with favorable outcomes (r = 0.570, P = .011). CONCLUSIONS The DWI and FLAIR severity scores appear highly prognostic, whereas percentage ADC reduction is moderately prognostic for clinical outcomes in pediatric acute toxic leukoencephalopathy. Immunosuppressive pediatric acute toxic leukoencephalopathy tends toward favorable outcomes, and fludarabine tends toward worse outcomes.
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Affiliation(s)
- K Ozturk
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota.
| | - J Rykken
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
| | - A M McKinney
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
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Ott FW, Pluhm R, Ozturk K, McKinney AM, Rykken JB. Counterpoint: Conventional Fluoroscopy-Guided Selective Cervical Nerve Root Block-A Safe, Effective, and Efficient Modality in the Hands of an Experienced Proceduralist. AJNR Am J Neuroradiol 2020; 41:1112-1119. [PMID: 32522840 DOI: 10.3174/ajnr.a6580] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 04/07/2020] [Indexed: 01/21/2023]
Abstract
BACKGROUND AND PURPOSE The conventional fluoroscopy-guided (CF) selective cervical nerve root block (SCNRB) is being used commonly as a treatment for cervical radicular pain as well as a diagnostic tool. This study aimed to identify any major complications and determine the safety and clinical utility of CF-SCNRB performed in a university hospital and associated outpatient clinics. MATERIALS AND METHODS Two-hundred fifty-four conventional fluoroscopy-guided selective cervical nerve root blocks were retrospectively identified from 2011 to 2018 using a radiology report search tool. Each procedure was performed by an experienced neuroradiologist performing spinal injections on a full-time basis in clinical practice. A 10-point pain scale was used for pre- and postprocedural pain-level assessment. Successful conventional, fluoroscopy-guided, selective cervical nerve root block was defined as a patient-reported pain scale reduction of at least 50% and/or alleviation of numbness or paresthesia at ≥2 weeks postinjection. All clinically important immediate and delayed complications were also recorded. RESULTS Two-hundred fifty-four conventional fluoroscopy-guided selective cervical nerve root blocks were performed via an anterolateral approach with an average fluoroscopy time of 24.3 seconds for all cases. There were no aborted procedures and no major or permanent complications. There were 14 minor complications; 12 of these were periprocedural and resolved by the 2-week follow-up visit. One-hundred eighty-five patients (75.2%) reported pain improvement of >50% from baseline at 15 minutes postinjection. Overall, 172 patients (67.7%) reported >50% pain scale reduction or alleviation from paresthesia at least 2 weeks postinjection. CONCLUSIONS Conventional fluoroscopy-guided selective cervical nerve root block is an efficacious, efficient, and safe outpatient procedure when performed by a skilled and experienced proceduralist.
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Affiliation(s)
- F W Ott
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota.
| | - R Pluhm
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
| | - K Ozturk
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
| | - A M McKinney
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
| | - J B Rykken
- From the Department of Radiology, University of Minnesota, Minneapolis, Minnesota
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13
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Ozturk K, Kastamoni Y, Dursun A, Albay S. Prevalence of the extensor digitorum, extensor digiti minimi and extensor indicis tendons and their variations. Hand Surg Rehabil 2020; 39:320-327. [PMID: 32259596 DOI: 10.1016/j.hansur.2020.02.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 02/19/2020] [Accepted: 02/22/2020] [Indexed: 12/17/2022]
Abstract
We aimed to investigate tendon variations of the extensor digitorum (ED), extensor digiti minimi (EDM), and extensor indicis proprius (EIP) muscles. Our study was performed on 43 fetal cadavers (86 extremities), aged between 17 and 40 weeks of gestation. The number of ED tendons varied from three to six, proximal to the extensor retinaculum (ER), and from three to eight, distal to the ER. The ED most often had four tendons, both proximally and distally from the ER. The ED tendons of the fourth finger were observed to be most frequently duplicated. The most common juncturae tendinum (JT) was type 1 in the second intermetacarpal space (IMCS), type 2 in the third IMCS, and type 3r in the fourth IMCS according to von Schroeder classification. The number of EIP and EDM tendons varied from one to two and from one to five, respectively. The EIP double tendons inserted both into the ulnar and palmar sides of the extensor digitorum of the second finger, which had not been reported in the literature. In our study, 7% of hands had variant muscles. In 4.7% of hands, the extensor indicis et medii communis was observed, while the extensor medii proprius and the extensor digitorum brevis manus were observed in 1.2% and 1.2% of hands, respectively. Knowing the prevalence of the ED, EDM and EIP tendons and their variations in the fetal period should help to treat partial loss of hand function or injury after birth and to correct congenital hand deformities.
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Affiliation(s)
- K Ozturk
- Department of Anatomy, Faculty of Medicine, Suleyman Demirel University, Çünür, Süleyman Demirel Cd, 32260 Merkez/Isparta, Turkey.
| | - Y Kastamoni
- Department of Anatomy, Faculty of Medicine, Suleyman Demirel University, Çünür, Süleyman Demirel Cd, 32260 Merkez/Isparta, Turkey.
| | - A Dursun
- Department of Anatomy, Faculty of Medicine, Suleyman Demirel University, Çünür, Süleyman Demirel Cd, 32260 Merkez/Isparta, Turkey.
| | - S Albay
- Department of Anatomy, Faculty of Medicine, Suleyman Demirel University, Çünür, Süleyman Demirel Cd, 32260 Merkez/Isparta, Turkey.
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Ozturk K, Arslan FB, Tavukcuoglu E, Esendagli G, Calis S. Aggregation of chitosan nanoparticles in cell culture: Reasons and resolutions. Int J Pharm 2020; 578:119119. [DOI: 10.1016/j.ijpharm.2020.119119] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/03/2020] [Accepted: 02/04/2020] [Indexed: 12/12/2022]
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15
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Fong SH, Carlin DE, Ozturk K, Ideker T. Strategies for Network GWAS Evaluated Using Classroom Crowd Science. Cell Syst 2019; 9:414. [PMID: 31647918 DOI: 10.1016/j.cels.2019.09.001] [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: 10/25/2022]
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16
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Monzon AM, Carraro M, Chiricosta L, Reggiani F, Han J, Ozturk K, Wang Y, Miller M, Bromberg Y, Capriotti E, Savojardo C, Babbi G, Martelli PL, Casadio R, Katsonis P, Lichtarge O, Carter H, Kousi M, Katsanis N, Andreoletti G, Moult J, Brenner SE, Ferrari C, Leonardi E, Tosatto SCE. Performance of computational methods for the evaluation of pericentriolar material 1 missense variants in CAGI-5. Hum Mutat 2019; 40:1474-1485. [PMID: 31260570 PMCID: PMC7354699 DOI: 10.1002/humu.23856] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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: 02/22/2019] [Revised: 05/30/2019] [Accepted: 06/23/2019] [Indexed: 12/11/2022]
Abstract
The CAGI-5 pericentriolar material 1 (PCM1) challenge aimed to predict the effect of 38 transgenic human missense mutations in the PCM1 protein implicated in schizophrenia. Participants were provided with 16 benign variants (negative controls), 10 hypomorphic, and 12 loss of function variants. Six groups participated and were asked to predict the probability of effect and standard deviation associated to each mutation. Here, we present the challenge assessment. Prediction performance was evaluated using different measures to conclude in a final ranking which highlights the strengths and weaknesses of each group. The results show a great variety of predictions where some methods performed significantly better than others. Benign variants played an important role as negative controls, highlighting predictors biased to identify disease phenotypes. The best predictor, Bromberg lab, used a neural-network-based method able to discriminate between neutral and non-neutral single nucleotide polymorphisms. The CAGI-5 PCM1 challenge allowed us to evaluate the state of the art techniques for interpreting the effect of novel variants for a difficult target protein.
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Affiliation(s)
| | - Marco Carraro
- Department of Biomedical Sciences, University of Padua, Padua, Italy
| | - Luigi Chiricosta
- Department of Biomedical Sciences, University of Padua, Padua, Italy
| | - Francesco Reggiani
- Department of Biomedical Sciences, University of Padua, Padua, Italy
- Department of Information Engineering, University of Padua, Padua, Italy
| | - James Han
- Department of Medicine, University of California San Diego, La Jolla, California
| | - Kivilcim Ozturk
- Department of Medicine, University of California San Diego, La Jolla, California
| | - Yanran Wang
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, New Jersey
| | - Maximilian Miller
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, New Jersey
| | - Yana Bromberg
- Department of Biochemistry and Microbiology, Rutgers University, New Brunswick, New Jersey
- Institute for Advanced Study, Technical University of Munich (TUM), Munich, Germany
| | - Emidio Capriotti
- Department of Pharmacy and Biotechnology, BioFolD Unit, University of Bologna, Bologna, Italy
| | - Castrense Savojardo
- Department of Pharmacy and Biotechnology, Biocomputing Group, University of Bologna, Bologna, Italy
| | - Giulia Babbi
- Department of Pharmacy and Biotechnology, Biocomputing Group, University of Bologna, Bologna, Italy
| | - Pier L Martelli
- Department of Pharmacy and Biotechnology, Biocomputing Group, University of Bologna, Bologna, Italy
| | - Rita Casadio
- Department of Pharmacy and Biotechnology, Biocomputing Group, University of Bologna, Bologna, Italy
| | - Panagiotis Katsonis
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Olivier Lichtarge
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas
| | - Hannah Carter
- Department of Medicine, University of California San Diego, La Jolla, California
| | - Maria Kousi
- MIT Computer Science and Artificial Intelligence Laboratory (CSAIL), Broad Institute of MIT and Harvard, Cambridge, Massachusetts
| | - Nicholas Katsanis
- Center for Human Disease Modeling, Duke University Medical Center, Durham, North Carolina
| | - Gaia Andreoletti
- Department of Plant and Microbial Biology, University of California, Berkeley, CA, USA
| | - John Moult
- Institute for Bioscience and Biotechnology Research, University of Maryland, Rockville, Maryland
- Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland
| | - Steven E Brenner
- Department of Plant and Microbial Biology, University of California, Berkeley, CA, USA
| | - Carlo Ferrari
- Department of Information Engineering, University of Padua, Padua, Italy
| | | | - Silvio C E Tosatto
- Department of Biomedical Sciences, University of Padua, Padua, Italy
- Environmental Genomics and Systems Biology Division, Lawrence Berkeley National Laboratory, Berkeley, California
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Castro A, Ozturk K, Pyke RM, Xian S, Zanetti M, Carter H. Elevated neoantigen levels in tumors with somatic mutations in the HLA-A, HLA-B, HLA-C and B2M genes. BMC Med Genomics 2019; 12:107. [PMID: 31345234 PMCID: PMC6657029 DOI: 10.1186/s12920-019-0544-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Background The major histocompatibility complex class I (MHC-I) molecule is a protein complex that displays intracellular peptides to T cells, allowing the immune system to recognize and destroy infected or cancerous cells. MHC-I is composed of a highly polymorphic HLA-encoded alpha chain that binds the peptide and a Beta-2-microglobulin (B2M) protein that acts as a stabilizing scaffold. HLA mutations have been implicated as a mechanism of immune evasion during tumorigenesis, and B2M is considered a tumor suppressor gene. However, the implications of somatic HLA and B2M mutations have not been fully explored in the context of antigen presentation via the MHC-I molecule during tumor development. To understand the effect that B2M and HLA MHC-I molecule mutations have on mutagenesis, we analyzed the accumulation of mutations in patients from The Cancer Genome Atlas according to their MHC-I molecule mutation status. Results Somatic B2M and HLA mutations in microsatellite stable tumors were associated with higher overall mutation burden and a larger fraction of HLA-binding neoantigens when compared to B2M and HLA wild type tumors. B2M and HLA mutations were highly enriched in patients with microsatellite instability. B2M mutations tended to occur relatively early during patients’ respective tumor development, whereas HLA mutations were either early or late events. In addition, B2M and HLA mutated patients had higher levels of immune infiltration by natural killer and CD8+ T cells and higher levels of cytotoxicity. Conclusions Our findings add to a growing body of evidence that somatic B2M and HLA mutations are a mechanism of immune evasion by demonstrating that such mutations are associated with a higher load of neoantigens that should be presented via MHC-I. Electronic supplementary material The online version of this article (10.1186/s12920-019-0544-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Andrea Castro
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA, 92093, USA.,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, 92093, USA
| | - Kivilcim Ozturk
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA, 92093, USA.,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, 92093, USA
| | - Rachel Marty Pyke
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA, 92093, USA.,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, 92093, USA
| | - Su Xian
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA, 92093, USA
| | - Maurizio Zanetti
- Moores Cancer Center, University of California San Diego, La Jolla, CA, 92093, USA.,The Laboratory of Immunology and Department of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Hannah Carter
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA, 92093, USA. .,Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA, 92093, USA. .,Moores Cancer Center, University of California San Diego, La Jolla, CA, 92093, USA. .,CIFAR, MaRS Centre, West Tower, 661 University Ave., Suite 505, Toronto, ON, M5G 1M1, Canada.
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18
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Ozturk K, Soylu E, Yazici Z, Ozkaya G, Savci G. Differentiation of hepatocellular carcinoma from non-hepatocellular malignant tumours of liver by chemical-shift MRI at 3 T. Clin Radiol 2019; 74:797-804. [PMID: 31300210 DOI: 10.1016/j.crad.2019.06.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/12/2019] [Indexed: 12/18/2022]
Abstract
AIM To evaluate the diagnostic performance of chemical shift magnetic resonance imaging (MRI) in distinguishing hepatocellular carcinomas (HCCs) from non-hepatocellular malignant tumours (non-HCCs) of the liver. MATERIALS AND METHODS Patients with a diagnosis of malignant liver tumours examined at 3 T MRI were included in this retrospective study. Forty-seven HCCs and 75 non-HCCs that were studied with chemical-shift MRI between January 2012 and October 2016 were retrieved from the radiology database. Two blinded observers measured the signal intensities of the tumours, adjacent normal-looking liver parenchyma, and spleen on chemical-shift MRI. The fat quantification for HCCs, non-HCCs, and adjacent normal-looking liver parenchyma were calculated by using the spleen as a reference standard. The subtraction scores were calculated by subtracting fat percentages in liver parenchyma from those in tumours. The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the fat percentage subtraction scores in distinguishing HCCs from non-HCCs were calculated. RESULTS According to the optimal cut-off value acquired from both readers, a subtraction score >-0.26 was considered to be a HCC. Fat signal percentage subtraction scores were ≥-0.26 in 45 of 47 HCCs and were <-0.26 in 69 of 75 non-HCCs. The sensitivity, specificity, PPV, and NPV of fat signal percentage subtraction score to differentiate HCCs from non-HCCs were found to be 95.7%, 89.3%, 84.9%, and 97.1%, respectively. CONCLUSION Intracytoplasmic lipid in HCCs demonstrated by quantitative chemical-shift MRI may be a potentially powerful imaging biomarker to distinguish HCCs from the other malignant liver tumours.
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Affiliation(s)
- K Ozturk
- Department of Radiology, Uludag University Faculty of Medicine, Gorukle Street, Bursa, Turkey.
| | - E Soylu
- Department of Radiology, Uludag University Faculty of Medicine, Gorukle Street, Bursa, Turkey
| | - Z Yazici
- Department of Radiology, Uludag University Faculty of Medicine, Gorukle Street, Bursa, Turkey
| | - G Ozkaya
- Department of Biostatistics, Uludag University Faculty of Medicine, Gorukle Street, Bursa, Turkey
| | - G Savci
- Department of Radiology, Uludag University Faculty of Medicine, Gorukle Street, Bursa, Turkey
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Fong SH, Carlin DE, Ozturk K, Ideker T. Strategies for Network GWAS Evaluated Using Classroom Crowd Science. Cell Syst 2019; 8:275-280. [PMID: 31022372 DOI: 10.1016/j.cels.2019.03.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 03/29/2019] [Indexed: 12/15/2022]
Abstract
Biological networks can substantially boost power to identify disease genes in genome-wide association studies. To explore different network GWAS methods, we challenged students of a UC San Diego graduate level bioinformatics course, Network Biology and Biomedicine, to explore and improve such algorithms during a four-week-long classroom competition. Here, we report the many creative solutions and share our experiences in conducting classroom crowd science as both a research and pedagogical tool.
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Affiliation(s)
- Samson H Fong
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA
| | - Daniel E Carlin
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA
| | - Kivilcim Ozturk
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; Program in Bioinformatics, University of California San Diego, La Jolla, CA 92093, USA
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- Program in Bioinformatics, University of California San Diego, La Jolla, CA 92093, USA
| | - Trey Ideker
- Department of Medicine, University of California San Diego, La Jolla, CA 92093, USA; Department of Bioengineering, University of California San Diego, La Jolla, CA 92093, USA; Program in Bioinformatics, University of California San Diego, La Jolla, CA 92093, USA.
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Abstract
Human cancers often harbor large numbers of somatic mutations. However, only a small proportion of these mutations are expected to contribute to tumor growth and progression. Therefore, determining causal driver mutations and the genes they target is becoming an important challenge in cancer genomics. Here we describe an approach for mapping somatic mutations onto 3D structures of human proteins in complex to identify "driver interfaces." Our strategy relies on identifying protein-interaction interfaces that are unexpectedly biased toward nonsynonymous mutations, which suggests that these interfaces are subject to positive selection during tumorigenesis, implicating the interacting proteins as candidate drivers.
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Affiliation(s)
- Kivilcim Ozturk
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, USA
- Bioinformatics Program, University of California San Diego, La Jolla, CA, USA
| | - Hannah Carter
- Division of Medical Genetics, Department of Medicine, University of California San Diego, La Jolla, CA, USA.
- Bioinformatics Program, University of California San Diego, La Jolla, CA, USA.
- Moores Cancer Center, University of California San Diego, La Jolla, CA, USA.
- Institute for Genomic Medicine, University of California San Diego, La Jolla, CA, USA.
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21
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Capriotti E, Ozturk K, Carter H. Integrating molecular networks with genetic variant interpretation for precision medicine. Wiley Interdiscip Rev Syst Biol Med 2018; 11:e1443. [PMID: 30548534 PMCID: PMC6450710 DOI: 10.1002/wsbm.1443] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Revised: 10/23/2018] [Accepted: 10/30/2018] [Indexed: 02/01/2023]
Abstract
More reliable and cheaper sequencing technologies have revealed the vast mutational landscapes characteristic of many phenotypes. The analysis of such genetic variants has led to successful identification of altered proteins underlying many Mendelian disorders. Nevertheless the simple one‐variant one‐phenotype model valid for many monogenic diseases does not capture the complexity of polygenic traits and disorders. Although experimental and computational approaches have improved detection of functionally deleterious variants and important interactions between gene products, the development of comprehensive models relating genotype and phenotypes remains a challenge in the field of genomic medicine. In this context, a new view of the pathologic state as significant perturbation of the network of interactions between biomolecules is crucial for the identification of biochemical pathways associated with complex phenotypes. Seminal studies in systems biology combined the analysis of genetic variation with protein–protein interaction networks to demonstrate that even as biological systems evolve to be robust to genetic variation, their topologies create disease vulnerabilities. More recent analyses model the impact of genetic variants as changes to the “wiring” of the interactome to better capture heterogeneity in genotype–phenotype relationships. These studies lay the foundation for using networks to predict variant effects at scale using machine‐learning or algorithmic approaches. A wealth of databases and resources for the annotation of genotype–phenotype relationships have been developed to support developments in this area. This overview describes how study of the molecular interactome has generated insights linking the organization of biological systems to disease mechanism, and how this information can enable precision medicine. This article is categorized under:
Translational, Genomic, and Systems Medicine > Translational Medicine Biological Mechanisms > Cell Signaling Models of Systems Properties and Processes > Mechanistic Models Analytical and Computational Methods > Computational Methods
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Affiliation(s)
- Emidio Capriotti
- Department of Pharmacy and Biotechnology (FaBiT), University of Bologna, Bologna, Italy
| | - Kivilcim Ozturk
- Bioinformatics and Systems Biology Program, University of California, San Diego, La Jolla, California
| | - Hannah Carter
- Department of Medicine and Institute for Genomic Medicine, University of California, San Diego, La Jolla, California
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Ozturk K, Dow M, Carlin DE, Bejar R, Carter H. The Emerging Potential for Network Analysis to Inform Precision Cancer Medicine. J Mol Biol 2018; 430:2875-2899. [PMID: 29908887 PMCID: PMC6097914 DOI: 10.1016/j.jmb.2018.06.016] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [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: 03/12/2018] [Revised: 05/30/2018] [Accepted: 06/06/2018] [Indexed: 12/19/2022]
Abstract
Precision cancer medicine promises to tailor clinical decisions to patients using genomic information. Indeed, successes of drugs targeting genetic alterations in tumors, such as imatinib that targets BCR-ABL in chronic myelogenous leukemia, have demonstrated the power of this approach. However, biological systems are complex, and patients may differ not only by the specific genetic alterations in their tumor, but also by more subtle interactions among such alterations. Systems biology and more specifically, network analysis, provides a framework for advancing precision medicine beyond clinical actionability of individual mutations. Here we discuss applications of network analysis to study tumor biology, early methods for N-of-1 tumor genome analysis, and the path for such tools to the clinic.
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Affiliation(s)
- Kivilcim Ozturk
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA; Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA 92093, USA
| | - Michelle Dow
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA; Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA 92093, USA
| | - Daniel E Carlin
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA
| | - Rafael Bejar
- Moores Cancer Center, Division of Hematology and Oncology, University of California San Diego, La Jolla, CA 92093, USA
| | - Hannah Carter
- Department of Medicine, Division of Medical Genetics, University of California San Diego, La Jolla, CA 92093, USA; Bioinformatics and Systems Biology Program, University of California San Diego, La Jolla, CA 92093, USA; Moores Cancer Center and Institute for Genomic Medicine, University of California San Diego, La Jolla, CA 92093, USA; CIFAR, MaRS Centre, West Tower, 661 University Ave., Suite 505, Toronto, ON M5G 1M1, Canada.
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Abstract
Treatment and outcome of systemic lupus erythematosus (SLE) in C1q deficient patients are rarely reported. The aim of this report is to share our experience about the course of management of three cases diagnosed as SLE with C1q deficiency, in light of present literature. Initial and dominant complaints of three cases from two different families were cutaneous manifestations. One patient was also diagnosed with arthritis and thrombocytopenia. Antinuclear antibody was positive in all cases, whereas anti-dsDNA was negative with normal levels of complement C3, C4 and decreased CH50 activity. C1QA gene of two patients had homozygous nonsense mutation (c.622 > T/p.Gln208Ter). Previously, all of them had been treated with steroids, hydroxychloroquine and methotrexate or azathioprine. It was learned that they had responded only to high dosage prednisolone and their symptoms flared up during dosage reduction even under methotrexate or azathioprine. All symptoms of all three cases improved by daily fresh frozen plasma (FFP) infusions, and once cutaneous lesions subsided, the infusions were reduced to a frequency that would prevent the flare up of the symptoms. Literature search revealed seven reports on fresh frozen plasma treatment in SLE with C1q deficient patients. In this report, it is concluded that severe cutaneous lesions, as seen in these C1q deficient SLE patients, cannot be controlled with conventional immunosuppressive treatment. Instead, regular fresh frozen plasma infusions are proposed as a more reasonable method of treatment.
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Affiliation(s)
- Z Ekinci
- 1 Kadıköy Florence Nightingale Medical Center, Istanbul, Turkey
| | - K Ozturk
- 2 Cengiz Gökçek Kadın Doğum ve Çocuk Hastalıkları Hastanesi, Gaziantep, Turkey
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Ozturk K, Turhal G, Kaya I, Aysel A, Benzer M, Korkmaz Ekren P, Akyildiz S. A comparison of two endoscopic posterior cordotomy techniques: Laser cordotomy vs diathermy-assisted cordotomy. Clin Otolaryngol 2017; 43:256-260. [PMID: 28800194 DOI: 10.1111/coa.12953] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/07/2017] [Indexed: 11/27/2022]
Abstract
OBJECTIVES To compare respiratory function, swallowing and voice quality of bilateral abductor vocal fold paralysis (BAVFP) patients undergoing laser and diathermy-assisted posterior cordotomy. DESIGN Prospective study. SETTING Tertiary academic hospital. PARTICIPANTS Thirty patients were included in the study (groups 1 and 2, 15 patients each). Mean age was 53 ± 14.27 years with a range of 31-78 years (12 [40%] males, 18 [60%] females). MAIN OUTCOME MEASURES Sufficient airway, complications, FEV1, FEV1/FVC, peak expiratory flow rate (PEF), voice quality VAS, fundamental frequency, jitter, shimmer, NHR, amplitude perturbation quotient (APQ) and pitch perturbation quotient (PPQ) scores. RESULTS A sufficient laryngeal airway was achieved in all patients. Six patients (20%) developed postoperative granulation tissue (2 in group 1 and 4 in group 2). There was a statistically significant improvement in FEV1, FEV1/FVC and PEF measurements at the postoperative sixth month compared to preoperative measurements in both of the groups (P < .05). Preoperative median voice quality VAS scores in groups 1 and 2 were 8 (IQR = 1) and 8 (IQR = 3), respectively. Postoperative sixth-month voice quality VAS scores in groups 1 and 2 were 6 (IQR = 1) and 6 (IQR = 0), respectively. Postoperative VAS scores were significantly lower in both groups (P < .05). The postoperative changes in fundamental frequency, NHR, jitter, shimmer, APQ and PPQ were not statistically significant in both of the groups (P > .05). CONCLUSIONS Laser and diathermy-assisted posterior cordotomy are both minimally invasive, effective techniques with a long-term sufficient laryngeal airway. Despite lower quality of voice VAS scores, objective acoustic outcomes were not significantly lower in both of the groups.
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Affiliation(s)
- K Ozturk
- Department of Otolaryngology, Ege University School of Medicine, Izmir, Turkey
| | - G Turhal
- Department of Otolaryngology, Ege University School of Medicine, Izmir, Turkey
| | - I Kaya
- Department of Otolaryngology, Ege University School of Medicine, Izmir, Turkey
| | - A Aysel
- Department of Otolaryngology, Ege University School of Medicine, Izmir, Turkey
| | - M Benzer
- Department of Otolaryngology, Ege University School of Medicine, Izmir, Turkey
| | - P Korkmaz Ekren
- Department of Pulmonology, Ege University School of Medicine, Izmir, Turkey
| | - S Akyildiz
- Department of Otolaryngology, Ege University School of Medicine, Izmir, Turkey
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Dogan N, Nas OF, Canver B, Ozturk K, Gokalp G. Selective bilateral renal artery embolization with tris-acryl microspheres in focal segmental glomerulosclerosis. Diagn Interv Imaging 2016; 98:277-278. [PMID: 27663140 DOI: 10.1016/j.diii.2016.06.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 06/18/2016] [Accepted: 06/20/2016] [Indexed: 12/14/2022]
Affiliation(s)
- N Dogan
- Radiology Clinic, Private Bahar Hospital, Bursa, Turkey.
| | - O F Nas
- Department of Radiology, Uludag University, Faculty of Medicine, Gorukle Campusu, 16059 Bursa, Turkey.
| | - B Canver
- Nephrology Clinic, Bursa State Hospital, Bursa, Turkey.
| | - K Ozturk
- Department of Radiology, Uludag University, Faculty of Medicine, Gorukle Campusu, 16059 Bursa, Turkey.
| | - G Gokalp
- Department of Radiology, Uludag University, Faculty of Medicine, Gorukle Campusu, 16059 Bursa, Turkey.
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Ozturk K, Demirci H, Kurt O, Kantarcioglu M. Associated factors with atherosclerosis in hepatitis C infection. Intern Med J 2016; 46:862-3. [DOI: 10.1111/imj.13033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2015] [Accepted: 12/22/2015] [Indexed: 11/29/2022]
Affiliation(s)
- K. Ozturk
- Department of Gastroenterology; Gulhane School of Medicine; Ankara Turkey
| | - H. Demirci
- Department of Gastroenterology; Gulhane School of Medicine; Ankara Turkey
| | - O. Kurt
- Department of Gastroenterology; Gulhane School of Medicine; Ankara Turkey
| | - M. Kantarcioglu
- Department of Gastroenterology; Gulhane School of Medicine; Ankara Turkey
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Cinar M, Cakar M, Ozturk K, Yilmaz S, Dinc A. FRI0501 Investigation of Joint Hypermobility in Individuals with Indirect Hyperbilirubinemia and Acrocyanosis. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.5418] [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: 11/04/2022]
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Midilli R, Gode S, Ozturk K. The "two-point" technique for endoscopic sphenopalatine artery cauterization: is it effective and safe? Hippokratia 2015; 19:284. [PMID: 27418797 PMCID: PMC4938485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- R Midilli
- Ege University Medical School, Otolaryngology Department, Izmir, Turkey
| | - S Gode
- Ege University Medical School, Otolaryngology Department, Izmir, Turkey
| | - K Ozturk
- Ege University Medical School, Otolaryngology Department, Izmir, Turkey
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Ekinci Z, Ozturk K, Anik Y. AB1031 A Rare Cause of Myopathy: Inflammatory Myopathy with Abundant Macrophages in a Child. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.3124] [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: 11/04/2022]
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Ozturk K, Ekinci Z. FRI0521 Serum Amyloid a in Familial Mediterranean Fever: How Much Important?: Table 1. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-eular.4044] [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: 11/04/2022]
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Ozturk K, Demirci H, Sakin YS, Uygun A, Bagci S. Efficiency of rifampicin in emergency treatment of severe hyperbilirubinemia : report of two cases and review of literature. Acta Gastroenterol Belg 2015; 78:256-258. [PMID: 26151703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We showed in this study that rifampicin therapy is more effective than plasmapheresis and steroid treatment in diseases associated with severe hyperbilirubinemia. In our opinion, rifampicin treatment may suitable especially for patients with persistent hyperbilirubinemia, and it would be appropriate to use rifampicin as a challenge therapy to patients with severe hyperbilirubinemia, but liver function tests in these patients must be monitored closely.
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Ozturk K, Tasci I, Yasar M, Akay C, Alcigir M, Vural S, Mas MR, Turker T, Saglam K. Effects of rapamycin treatment on pancreatic fibrosis, cellular apoptosis and oxidative stress in experimental chronic pancreatitis model. Acta Gastroenterol Belg 2015; 78:3-7. [PMID: 26118571 DOI: pmid/26118571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
PURPOSE Rapamycin reduces hepatic fibrosis by inhibiting hepatic stellate cell activation. The present study investigated whether rapamycin treatment could modify the degree of fibrosis, cellular apoptosis and oxidative stress (OS) in an experimental model of CP. METHODS Fifty-five male, Sprague-Dawley rats weighing 200-400g were randomized into four groups. CP was induced by intraductal trinitrobenzene sulfonic acid (TNBS) infusion in group A (n = 15) and group B (n = 15). Group C (n = 15) received intraductal TNBS and was killed for histologic confirmation at four weeks. Group D (n = 10) received intraductal saline instead of TNBS. Group A and group D received oral rapamycin (2 mg/kg/d) for two weeks after CP was induced while group B received oral tap water instead of rapamycin. Blood and pancreatic tissue specimens were collected and oxidative stress parameters, fibrosis and cellular apoptosis were determined. RESULTS Tissue and blood malondialdehyde (MDA) levels were significantly lower in rapamycin treated group compared to controls (p < 0.001). Superoxide dismutase (SOD) and glutathion peroxidase (GSH-Px) activities were also significantly higher in the active treatment group (p < 0.001 for both). Tissue and blood MDA, SOD, GSH-Px measurements was similar in rapamycin group and pancreatic cannulation group (p > 0.05). Histopathologic fibrosis scores were similar in rapamycin and control groups. Apoptotic cell counts tended to be lower in rapamycin treated animals. CONCLUSIONS Administration of rapamycin alleviated OS and, in part, prevented apoptotic cell death in experimental CP, but did not reduce fibrosis.
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Gezer M, Tasci I, Demir O, Acikel C, Cakar M, Saglam K, Kutsi Kabul H, Fatih Bulucu M, Acar R, Ozturk K, Inanc Dogan M, Koc B. Low frequency of a decreased ankle brachial index and associated conditions in the practice of internal medicine in a Turkish population sample. INT ANGIOL 2012; 31:454-461. [PMID: 22990508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
AIM Peripheral arterial disease (PAD) is a less known condition in the practice of internal medicine, mostly due to lack of specific symptoms and low rates of physician awareness. However, cardiovascular disease (CVD) incidence is not significantly different among patients with symptomatic or asymptomatic disease. Ankle brachial index (ABI) measurement is an easy and cost-effective tool for the diagnosis of PAD. In the present study, frequency of low ABI and associated factors were investigated in the setting of internal medicine practice. METHODS Patients over 70 years of age and patients between 50 and 69 years with CVD or at least one atherothrombosis risk factor were included in the study. ABI was determined with handheld Doppler. Measurements were determined for both lower extremities. Lower of the right or left ABIs was taken as the final value. Low ABI was defined as ≤0.9. RESULTS A total of 303 subjects between 50 and 83 years of age were enrolled (female/male: 186/117). Mean ABI was 1.14±0.15. A low ABI was detected in 15 cases (4.95%). Prevalence was 7% in females and 1.7% in males (P=0.039). Low ABI value was not associated with any of the demographic parameters, presence of major risk factors or basic laboratory values. A high ABI was found by 5.6%. CONCLUSION In the present study, frequency of PAD as determined by ABI was found lower than those reported previously in most European countries. Nonetheless, our results showed that PAD affects at least 1 in 20 outpatients in the practice of internal medicine.
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Affiliation(s)
- M Gezer
- Department of Internal Medicine, Gulhane School of Medicine, Ankara, Turkey
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Mirzanli C, Ozturk K, Esenyel CZ, Ayanoglu S, Imren Y, Aliustaoglu S. Accuracy of intrasheath injection techniques for de Quervain's disease: a cadaveric study. J Hand Surg Eur Vol 2012; 37:155-60. [PMID: 21593074 DOI: 10.1177/1753193411409126] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The purpose of this study was to assess the accuracy of injections of dye into the first extensor compartment of the wrist using three different techniques in 150 wrists in 75 fresh cadavers. To compare injections, 50 wrists from 25 cadavers were used for each technique. After the injections, the first extensor compartment was dissected and the dispersion of dye around the abductor pollicis longus and extensor pollicis brevis tendons was investigated. In 72 % of all the wrists, acrylic dye was dispersed into one compartment containing both the abductor pollicis longus and extensor pollicis brevis tendons, but in 28% of the wrists there was a separate compartment for extensor pollicis brevis and dye entered only one of the compartments (14% for each compartment). For accurate injections, we think the injections should be made separately over the two tendons, to allow for the possibility of a septum within the compartment.
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Affiliation(s)
- C Mirzanli
- Vakif Gureba Training and Research Hospital, Orthopaedics and Traumatology Department, Adnan Menderes Bulvarı, Istanbul, Turkey.
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Jankowski V, Patzak A, Herget-Rosenthal S, Zidek W, Jankowski J, Jankowski V, Toelle M, van der Giet M, Zidek W, Jankowski J, Bae EH, Ma SK, Lee J, Kim SW, Jin K, Kim HJ, Vaziri ND, Osaki K, Suzuki Y, Sugaya T, Nishiyama A, Horikoshi S, Tomino Y, Matthesen SK, Gjoerup PH, Larsen T, Lauridsen TG, Nykjaer KM, Vase H, Pedersen EB, Jin K, Kim YW, Fujimori A, Yuyama H, Takakura K, Tahara A, Koakutsu A, Sanagi M, Sudoh K, Terada Y, Takakura K, Mizukami K, Miura M, Yokoyama K, Amano Y, Furukawa T, Tomura Y, Uchida W, Walkowska A, Kompanowska-Jezierska E, Sadowki J, Ozdemir ZN, Sener G, Ozgur S, Koc M, Suleymanoglu S, Yegen B, Efrati S, Berman S, Abu-Hamad R, Siman-Tov Y, Weissgarten J, Hermida RC, Ayala DE, Mojon A, Chayan L, Dominguez MJ, Fontao MJ, Alonso I, Fernandez JR, Hermida RC, Ayala DE, Mojon A, Fernandez JR, Hermida RC, Ayala DE, Fontao MJ, Mojon A, Chayan L, Dominguez MJ, Fernandez JR, Zanoli L, Alivon M, Estrugo N, Ketthab H, Pruny JF, Yanes S, Bean K, Empana JP, Jouven X, Laude RD, Laurent S, Boutouyrie P, Botticelli I, Quartagno R, Venturini M, Salvioni M, Lanzani C, Simonini M, Delli Carpini S, Zagato L, Manunta P, Blazquez-Medela AM, Garcia-Ortiz L, Gomez-Marcos MA, Recio-Rodriguez JI, Martin-Hinojal M, Rodriguez-Martin C, Castano-Sanchez C, de Cabo-Laso A, Sanchez-Salgado B, Lopez-Novoa JM, Martinez-Salgado C, Villevalde S, Tyukhmenev E, Klimenko A, Kobalava Z, Shin SJ, Oh SW, Rhee MY, Schneider M, Janka R, Raff U, Ritt M, Ott C, Uder M, Schmieder R, Ayala DE, Hermida RC, Golan E, Bernheim J, Podjarny E, Ozturk K, Bulucu F, Gezer M, Kilic S, Steele A, Rene de Cotret P, Hubert M, Leclerc JM, Tran L, Rigal R, Larsen T, Christensen FH, Bech JN, Pedersen EB, Raju B, Nirmala VR, Vijayalakshmi J, Kalaiselvi M, Rekha K, Paiva CE, Leone Aguiar AF, Coelho EB, Irzyniec T, Jez W, Paterno JC, Jara ZP, Barrinha FF, Freire AO, Casarini DE, Teixeira VDPC, Kose E, Can E, Alparslan C, Dogan A, Bal A, Demir BK, Anil M, Anil AB, Yavascan O, Aksu N, Villevalde S, Tyukhmenev E, Klimenko A, Kobalava Z, Irzyniec T, Prusek J, Szypula M, Grun O, Jeken J, Cremers B, Steimle C, Kersting S, Fliser D, Heine G, Hermida RC, Ayala DE, Fontao MJ, Mojon A, Fernandez JR, Pillar R, Lopes MGG, Cuppari L, Carvalho AB, Canziani MEF, Lipkowska K, Blumczynski A, Soltysiak J, Silska M, Poprawska A, Musielak A, Zaniew M, Zachwieja J, Labrador PJ, Gonzalez Castillo PM. Hypertension & hormones. Clin Kidney J 2011. [DOI: 10.1093/ndtplus/4.s2.45] [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: 11/14/2022] Open
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Cirpanli Y, Yerlikaya F, Ozturk K, Erdogar N, Launay M, Gegu C, Leturgez T, Bilensoy E, Calis S, Capan Y. Comparative evaluation of in vitro parameters of tamoxifen citrate loaded poly(lactide-co-glycolide), poly(epsilon-caprolactone) and chitosan nanoparticles. Pharmazie 2010; 65:867-870. [PMID: 21284254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Tamoxifen (TAM), the clinical choice for the antiestrogen treatment of advanced or metastatic breast cancer, was formulated in nanoparticulate carrier systems in the form of poly(lactide-co-glycolide) (PLGA), poly-epsilon-caprolactone (PCL) and chitosan (CS) nanoparticles. The PLGA and PCL nanoparticles were prepared by a nanoprecipitation technique whereas the CS nanoparticles were prepared by the ionic gelation method. Mean particle sizes were under 260 nm for PLGA and PCL nanoparticles and around 400 nm for CS nanoparticles. Polydispersity indices were less than 0.4 for all formulations. Zeta potential values were positive for TAM loaded nanoparticles because of the positive charge of the drug. Drug loading values were significantly higher for PCL nanoparticles when compared to PLGA and CS nanoparticles. All nanoparticle formulations exhibited controlled release properties. These results indicate that TAM loaded PLGA, PCL and CS nanoparticles may provide promising carrier systems for tumor targeting.
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Affiliation(s)
- Y Cirpanli
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
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Ozturk K, Caban S, Kozlu S, Kadayifci E, Yerlikaya F, Capan Y. The influence of technological parameters on the physicochemical properties of blank PLGA nanoparticles. Pharmazie 2010; 65:665-669. [PMID: 21038843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
In this work, PLGA nanoparticles were prepared by an emulsification-diffusion technique. The main objective was to optimize the preparation of formulations by evaluating the influence of the technological parameters on the physicochemical properties of PLGA nanoparticles. The effects of variations in polymer and emulsifier concentrations, and homogenization duration, rate and type on the particle size distribution, surface charge and morphology of nanoparticles were assessed. The smallest nanoparticles (177.53 +/- 2.78 nm) were obtained with a 2% PLGA (w/v) concentration in the organic phase and 3% PVA (w/v) in the aqueous phase and were prepared by an emulsification-diffusion method via ultrasonic homogenization at a power of 80 W applied for 30 s. It was observed that nanoparticles prepared by Ultra Turrax were more spherical but larger. In addition, increasing the PVA concentration in the aqueous phase, increasing the PLGA concentration in the organic phase and increasing the homogenization rate decreased the zeta potential values of PLGA nanoparticles.
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Affiliation(s)
- K Ozturk
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
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Bozkurt MK, Keles B, Azimov A, Ozturk K, Arbag H. The use of adjunctive topical mitomycin in endoscopic congenital choanal atresia repair. Int J Pediatr Otorhinolaryngol 2010; 74:733-6. [PMID: 20394996 DOI: 10.1016/j.ijporl.2010.03.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2009] [Revised: 03/11/2010] [Accepted: 03/12/2010] [Indexed: 10/19/2022]
Abstract
OBJECTIVE To evaluate the efficacy of topical mitomycin in providing the patency of the neochoanae in children undergoing transnasal endoscopic congenital choanal atresia (CA) repair. METHODS A retrospective analysis of surgical results in CA patients who were treated in Selcuk University, Meram Medical Faculty, Department of Otolaryngology between November 2002 and November 2009 was performed. All patients underwent transnasal endoscopic approach using nasal telescopes and traditional sinus instrumentation together with a microdebrider. Mitomycin was used according to the senior surgeon's preference, and certainly not in a randomized fashion. After completion of surgery, mitomycin 0.4 mg/ml was applied to the neochoanae for 3 min. Postoperative stenting was performed in all patients. RESULTS CA was unilateral in 8 subjects (mean age 71.8+/-41.7 months; range 18 months-144 months) and bilateral in 12 subjects (mean age 4.6+/-1.3 days; range 3-7 days). Among the subjects, 75% was female in both groups. Fourteen subjects under endoscopic repair without mitomycin, whereas mitomycin was used in 6 patients (4 bilateral, 2 unilateral). Stents were left at least 3 weeks postoperatively (mean 31+/-10 days; range 21-45 days). The patients were followed-up at least 6 months (range 6-72 months). No symptomatic restenosis requiring further dilatations was seen in patients treated with preoperative mitomycin, whereas restenosis was detected in 6 subjects (42.9%) treated without mitomycin postoperatively within 6 months period (Fisher's Exact Test 2-sided, p=0.12). These subjects underwent revision endoscopic repair with mitomycin and had no need for further dilatations with acceptable control of symptoms during a follow-up period ranging between 14 and 78 months. CONCLUSION Mitomycin improves the surgical treatment outcome of CA and reduces the rate of restenosis significantly without any complications. However, further prospective randomized studies are needed to fully investigate the benefits of mitomycin therapy in CA surgery.
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Affiliation(s)
- M K Bozkurt
- Department of Otolaryngology Head and Neck Surgery, Selçuk University, Meram Medical Faculty, Konya, Turkey.
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Abstract
AbstractObjective:The aim of the present study was to investigate the dose-related effectiveness of corticosteroids in the management of otitis media with effusion, by using the objective assessment techniques of tympanometry and cytokine measurement.Materials and methods:The eustachian tubes of 42 male rats were obstructed. Thirty-six subjects with effusion were randomly divided into three equal groups: controls; 0.5 mg/kg/day corticosteroid; and 1 mg/kg/day corticosteroid. Concentrations of interleukin-1β and tumour necrosis factor α in the middle-ear effusions were analysed using enzyme-linked immunosorbent assay.Results:An effusion occurred on the 14th post-operative day and was present on the 30th post-operative day in the control group. Otomicroscopic examination and tympanometric measurement showed an improvement in the intervention groups. There was a significant difference between both intervention groups and the control group for both interleukin-1β and tumour necrosis factor α concentrations (p < 0.01). However, there was no significant difference between the 0.5 mg/kg and the 1 mg/kg corticosteroid groups (p > 0.05).Conclusion:The study confirmed a short term beneficial effect of systemic steroids on resolution of otitis media with effusion in a rat model. Our results support the theory that corticosteroids significantly decrease concentrations of both interleukin-1β and tumour necrosis factor α. In our model, the 0.5 mg/kg corticosteroid dose was as effective as the 1 mg/kg corticosteroid dose. Further studies should be carried out to determine the optimal dose and duration of corticosteroids in the treatment of otitis media with effusion.
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Affiliation(s)
- H Yaman
- Department of Otolaryngology, Meram Medical Faculty, Selcuk University, Konya, Turkey.
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