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Lakshmigandhan I, Premalatha S, Prabhu E, Ravindranath NA, Gunasekaran G, Jayaraman V. Thermal conductivity-based hydrogen in argon detector (HAD): Design, development of instrumentation, and performance evaluation. Rev Sci Instrum 2023; 94:125006. [PMID: 38117195 DOI: 10.1063/5.0169764] [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] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 11/28/2023] [Indexed: 12/21/2023]
Abstract
The Hydrogen in Argon Detectors (HADs) working on the principle of thermal conductivity difference between argon (reference) and argon + H2 (sample) in the cover gas of a sodium-cooled fast breeder reactor using the Wheatstone bridge circuit. The output of HAD is very sensitive to the gas flow rate and to the variation in ambient temperature. The RMSnoise of current was brought within ±1 µA by a constant current source across the bridge. The temperature correction factor fed in the processor brought down the RMSnoise in the HAD signal within ±2.4 mV than the uncorrected one having RMSnoise of ±230 mV. The filtered noise of HAD facilitates enhancing the detection limit of HAD down to 30 ppm (3σ) of hydrogen in argon.
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Affiliation(s)
- I Lakshmigandhan
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
| | - S Premalatha
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
| | - E Prabhu
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
| | - Nair Afijith Ravindranath
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
| | - G Gunasekaran
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
| | - V Jayaraman
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, India
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Meyer AP, Ma J, Brock G, Hashimoto S, Cottrell CE, Mathew M, Hunter JM, Leung ML, Corsmeier D, Jayaraman V, Waldrop MA, Flanigan KM. Exome sequencing in the pediatric neuromuscular clinic leads to more frequent diagnosis of both neuromuscular and neurodevelopmental conditions. Muscle Nerve 2023; 68:833-840. [PMID: 37789688 DOI: 10.1002/mus.27976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 09/06/2023] [Accepted: 09/10/2023] [Indexed: 10/05/2023]
Abstract
INTRODUCTION/AIMS Exome sequencing (ES) has proven to be a valuable diagnostic tool for neuromuscular disorders, which often pose a diagnostic challenge. The aims of this study were to investigate the clinical outcomes associated with utilization of ES in the pediatric neuromuscular clinic and to determine if specific phenotypic features or abnormal neurodiagnostic tests were predictive of a diagnostic result. METHODS This was a retrospective medical record review of 76 pediatric neuromuscular clinic patients who underwent ES. Based upon clinical assessment prior to ES, patients were divided into two groups: affected by neuromuscular (n = 53) or non-neuromuscular (n = 23) syndromes. RESULTS A diagnosis was made in 28/76 (36.8%), with 29 unique disorders identified. In the neuromuscular group, a neuromuscular condition was confirmed in 78% of those receiving a genetic diagnosis. Early age of symptom onset was associated with a significantly higher diagnostic yield. The most common reason neuromuscular diagnoses were not detected on prior testing was due to causative genes not being present on disease-specific panels. Changes to medical care were made in 57% of individuals receiving a diagnosis on ES. DISCUSSION These data further support ES as a powerful diagnostic tool in the pediatric neuromuscular clinic and highlight the advantages of ES over gene panels, including the ability to identify diagnoses regardless of etiology, identify genes newly associated with disease, and identify multiple confounding diagnoses. Rapid and accurate diagnosis by ES can not only end the patient's diagnostic odyssey, but often impacts patients' medical management and genetic counseling of families.
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Affiliation(s)
- Alayne P Meyer
- Division of Genetic and Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
| | - Jianing Ma
- Department of Biomedical Informatics, The Ohio State University, Columbus, Ohio, USA
| | - Guy Brock
- Department of Biomedical Informatics, The Ohio State University, Columbus, Ohio, USA
| | - Sayaka Hashimoto
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Catherine E Cottrell
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pathology, The Ohio State University, Columbus, Ohio, USA
| | - Mariam Mathew
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pathology, The Ohio State University, Columbus, Ohio, USA
| | - Jesse M Hunter
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pathology, The Ohio State University, Columbus, Ohio, USA
| | - Marco L Leung
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
- Department of Pathology, The Ohio State University, Columbus, Ohio, USA
| | - Don Corsmeier
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Vijayakumar Jayaraman
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Megan A Waldrop
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- Department of Neurology, Nationwide Children's Hospital & The Ohio State University, Columbus, Ohio, USA
- Center for Gene Therapy, Nationwide Children's Hospital, Columbus, Ohio, USA
| | - Kevin M Flanigan
- Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio, USA
- Department of Neurology, Nationwide Children's Hospital & The Ohio State University, Columbus, Ohio, USA
- Center for Gene Therapy, Nationwide Children's Hospital, Columbus, Ohio, USA
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Schieffer KM, Moccia A, Bucknor BA, Stonerock E, Jayaraman V, Jenkins H, McKinney A, Koo SC, Mathew MT, Mardis ER, Lee K, Reshmi SC, Cottrell CE. Expanding the Clinical Utility of Targeted RNA Sequencing Panels beyond Gene Fusions to Complex, Intragenic Structural Rearrangements. Cancers (Basel) 2023; 15:4394. [PMID: 37686670 PMCID: PMC10486946 DOI: 10.3390/cancers15174394] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 08/29/2023] [Accepted: 08/31/2023] [Indexed: 09/10/2023] Open
Abstract
Gene fusions are a form of structural rearrangement well established as driver events in pediatric and adult cancers. The identification of such events holds clinical significance in the refinement, prognostication, and provision of treatment in cancer. Structural rearrangements also extend beyond fusions to include intragenic rearrangements, such as internal tandem duplications (ITDs) or exon-level deletions. These intragenic events have been increasingly implicated as cancer-promoting events. However, the detection of intragenic rearrangements may be challenging to resolve bioinformatically with short-read sequencing technologies and therefore may not be routinely assessed in panel-based testing. Within an academic clinical laboratory, over three years, a total of 608 disease-involved samples (522 hematologic malignancy, 86 solid tumors) underwent clinical testing using Anchored Multiplex PCR (AMP)-based RNA sequencing. Hematologic malignancies were evaluated using a custom Pan-Heme 154 gene panel, while solid tumors were assessed using a custom Pan-Solid 115 gene panel. Gene fusions, ITDs, and intragenic deletions were assessed for diagnostic, prognostic, or therapeutic significance. When considering gene fusions alone, we report an overall diagnostic yield of 36% (37% hematologic malignancy, 41% solid tumors). When including intragenic structural rearrangements, the overall diagnostic yield increased to 48% (48% hematologic malignancy, 45% solid tumor). We demonstrate the clinical utility of reporting structural rearrangements, including gene fusions and intragenic structural rearrangements, using an AMP-based RNA sequencing panel.
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Affiliation(s)
- Kathleen M. Schieffer
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pathology, The Ohio State University, Columbus, OH 43210, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Amanda Moccia
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
| | - Brianna A. Bucknor
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
| | - Eileen Stonerock
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
| | - Vijayakumar Jayaraman
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
| | - Heather Jenkins
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
| | - Aimee McKinney
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
| | - Selene C. Koo
- Department of Pathology, The Ohio State University, Columbus, OH 43210, USA
- Department of Pathology and Laboratory Medicine, Nationwide Children’s Hospital, Columbus, OH 43205, USA
| | - Mariam T. Mathew
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pathology, The Ohio State University, Columbus, OH 43210, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Elaine R. Mardis
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Kristy Lee
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pathology, The Ohio State University, Columbus, OH 43210, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Shalini C. Reshmi
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pathology, The Ohio State University, Columbus, OH 43210, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Catherine E. Cottrell
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH 43215, USA
- Department of Pathology, The Ohio State University, Columbus, OH 43210, USA
- Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
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Faizal VA, Murugesan N, Sukumaran V, Jena H, Remash C, Ganesan R, Jayaraman V. Contact angle measurement system with liquid sodium in inert atmosphere. Rev Sci Instrum 2023; 94:065105. [PMID: 37862516 DOI: 10.1063/5.0151599] [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] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 06/01/2023] [Indexed: 10/22/2023]
Abstract
Liquid sodium is the heat transport medium in fast breeder reactors due to its favorable chemical, physical, and nuclear properties. Wetting of liquid sodium with the material of reactor components is essential for the effective functioning of the reactor. Liquid sodium wetting plays a crucial role, such as in (i) heat transfer and (ii) image reconstruction under sodium ultrasonic scanners. Contact angle is the inverse measure of the wetting of liquids over solid surfaces. A contact angle measurement system was set up in an inert atmosphere glow box to study the wetting behavior of liquid sodium on reactor materials. The contact angle of liquid sodium on nickel surface was measured as a function of temperature, and the results obtained were found to be in good agreement with the literature values. The contact angle of liquid sodium on SS316LN as a function of temperature was measured for the first time using this facility.
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Affiliation(s)
- V A Faizal
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - N Murugesan
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - V Sukumaran
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - Hrudananda Jena
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - C Remash
- Formerly with Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - Rajesh Ganesan
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - V Jayaraman
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
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Murugesan N, Faizal V, Prabhu E, Shyam Kumar S, Ghosh S, Sree Rama Murthy A, Sudha R, Jena H, Ganesan R, Jayaraman V. Studies on In-situ regeneration of cold trap of a Bench-Top sodium loop. Nuclear Engineering and Design 2023. [DOI: 10.1016/j.nucengdes.2023.112156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Schieffer K, Mathew M, Lee K, Choi S, Varga E, Garval E, Grischow O, Jalkanen A, Jayaraman V, Corsmeier D, Kelly B, Chang P, Fitch J, Miller K, Koboldt D, White P, Magrini V, Wilson R, Mardis E, Cottrell C. 117. Clinical lessons learned from Translational Molecular Profiling of Cancer and Somatic Disease. Cancer Genet 2022. [DOI: 10.1016/j.cancergen.2022.10.120] [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: 11/28/2022]
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Lindsay SA, Sriram S, Chand M, Annapoorani S, Lakshmi KU, Jena H, Vijayalakshmi S, Kumar R, Jayaraman V. Correction to: Evaluation of leaching behaviour of Nd from Ca10−xNdx(PO4)F2, (x = 0–1.2) matrix and its borosilicate glass-bonded analogues by neutron activation and ICP-OES analysis. Chem Pap 2022. [DOI: 10.1007/s11696-022-02546-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Arredondo K, Myers C, Hansen-Kiss E, Mathew MT, Jayaraman V, Siemon A, Bartholomew D, Herman GE, Mori M. Phenotypic Spectrum in a Family Sharing a Heterozygous KCNQ3 Variant. J Child Neurol 2022; 37:517-523. [PMID: 35384780 DOI: 10.1177/08830738221089741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND PURPOSE Mutations in KCNQ3 have classically been associated with benign familial neonatal and infantile seizures and more recently identified in patients with neurodevelopmental disorders and abnormal electroencephalogram (EEG) findings. We present 4 affected patients from a family with a pathogenic mutation in KCNQ3 with a unique constellation of clinical findings. METHODS A family of 3 affected siblings and mother sharing a KCNQ3 pathogenic variant are described, including clinical history, genetic results, and EEG and magnetic resonance imaging (MRI) findings. RESULTS This family shows a variety of clinical manifestations, including neonatal seizures, developmental delays, autism spectrum disorder, and anxiety. One child developed absence epilepsy, 2 children have infrequent convulsive seizures that have persisted into childhood, and their parent developed adult-onset epilepsy. An underlying c.1091G>A (R364H) variant in KCNQ3 was found in all affected individuals. CONCLUSIONS The phenotypic variability of KCNQ3 channelopathies continues to expand as more individuals and families are described, and the variant identified in this family adds to the understanding of the manifestations of KCNQ3-related disorders.
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Affiliation(s)
- Kristen Arredondo
- Department of Pediatrics, 12306The Ohio State University, Columbus, OH, USA
- Division of Pediatric Neurology, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Cortlandt Myers
- Division of Genetic & Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Emily Hansen-Kiss
- Department of Diagnostic & Biomedical Sciences, 12340University of Texas Health Science Center at Houston, School of Dentistry, Houston, TX, USA
| | - Mariam T Mathew
- Department of Pediatrics, 12306The Ohio State University, Columbus, OH, USA
- Institute for Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Vijayakumar Jayaraman
- Institute for Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Amy Siemon
- Division of Genetic & Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Dennis Bartholomew
- Department of Pediatrics, 12306The Ohio State University, Columbus, OH, USA
- Division of Genetic & Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Gail E Herman
- Department of Pediatrics, 12306The Ohio State University, Columbus, OH, USA
- Division of Genetic & Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
| | - Mari Mori
- Department of Pediatrics, 12306The Ohio State University, Columbus, OH, USA
- Division of Genetic & Genomic Medicine, 2650Nationwide Children's Hospital, Columbus, OH, USA
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Lecerf K, Koboldt DC, Kuehn HS, Jayaraman V, Lee K, Mihalic Mosher T, Yonkof JR, Mori M, Hickey SE, Franklin S, Drew J, Akoghlanian S, Sivaraman V, Rosenzweig SD, Wilson RK, Abraham RS. Case report and review of the literature: immune dysregulation in a large familial cohort due to a novel pathogenic RELA variant. Rheumatology (Oxford) 2022; 62:347-359. [PMID: 35412596 PMCID: PMC9960492 DOI: 10.1093/rheumatology/keac227] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 03/23/2022] [Accepted: 03/23/2022] [Indexed: 12/27/2022] Open
Abstract
OBJECTIVE To explore and define the molecular cause(s) of a multi-generational kindred affected by Bechet's-like mucocutaneous ulcerations and immune dysregulation. METHODS Whole genome sequencing and confirmatory Sanger sequencing were performed. Components of the NFκB pathway were quantified by immunoblotting, and function was assessed by cytokine production (IL-6, TNF-α, IL-1β) after lipopolysaccharide (LPS) stimulation. Detailed immunophenotyping of T-cell and B-cell subsets was performed in four patients from this cohort. RESULTS A novel variant in the RELA gene, p. Tyr349LeufsTer13, was identified. This variant results in premature truncation of the protein before the serine (S) 536 residue, a key phosphorylation site, resulting in enhanced degradation of the p65 protein. Immunoblotting revealed significantly decreased phosphorylated [p]p65 and pIκBα. The decrease in [p]p65 may suggest reduced heterodimer formation between p50/p65 (NFκB1/RelA). Immunophenotyping revealed decreased naïve T cells, increased memory T cells, and expanded senescent T-cell populations in one patient (P1). P1 also had substantially higher IL-6 and TNF-α levels post-stimulation compared with the other three patients. CONCLUSION Family members with this novel RELA variant have a clinical phenotype similar to other reported RELA cases with predominant chronic mucocutaneous ulceration; however, the clinical phenotype broadens to include Behçet's syndrome and IBD. Here we describe the clinical, immunological and genetic evaluation of a large kindred to further expand identification of patients with autosomal dominant RELA deficiency, facilitating earlier diagnosis and intervention. The functional impairment of the canonical NFκB pathway suggests that this variant is causal for the clinical phenotype in these patients.
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Affiliation(s)
- Kelsey Lecerf
- Division of Allergy and Immunology, Department of Pediatrics, Nationwide Children’s Hospital,Division of Allergy and Immunology, Department of Otolaryngology, The Ohio State University Wexner Medical Center
| | - Daniel C Koboldt
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH
| | - Hye Sun Kuehn
- Immunology Service, Department of Laboratory Medicine, NIH Clinical Center, Bethesda, MD
| | - Vijayakumar Jayaraman
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH
| | - Kristy Lee
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH,Department of Pathology, The Ohio State University Wexner College of Medicine, Columbus, OH
| | - Theresa Mihalic Mosher
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH,Ambry Genetics, Aliso Viejo, CA
| | | | - Mari Mori
- Division of Genetic and Genomic Medicine
| | | | - Samuel Franklin
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH
| | - Joanne Drew
- Division of Pediatric Rheumatology, Department of Pediatrics
| | | | - Vidya Sivaraman
- Division of Pediatric Rheumatology, Department of Pediatrics
| | - Sergio D Rosenzweig
- Immunology Service, Department of Laboratory Medicine, NIH Clinical Center, Bethesda, MD
| | - Richard K Wilson
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children’s Hospital, Columbus, OH
| | - Roshini S Abraham
- Correspondence to: Roshini S. Abraham, Nationwide Children’s Hospital, 700 Children’s Drive, Columbus, OH-43205, USA. E-mail:
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Kumar SS, Prasad GR, Rao JP, Kumar VS, Ganesan R, Jayaraman V. Design, development, and instrumentation of isopiestic experimental setup. Rev Sci Instrum 2022; 93:044105. [PMID: 35489907 DOI: 10.1063/5.0077715] [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] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 03/05/2022] [Indexed: 06/14/2023]
Abstract
An isopiestic experimental facility for the measurement of vapor pressures has been designed, fabricated, and commissioned. Using the vapor pressure data as a function of temperature, useful thermodynamic properties of alloys and compounds of interest can be derived. The isopiestic facility comprises a pair of furnaces, temperature controllers, thermocouple movement mechanism, user interface, and data collection. Four such experimental setups have been commissioned. This experimental facility is useful to determine the vapor pressures of a volatile component over the condensed phases as a function of temperature and composition. Using the vapor pressure data, the thermodynamic properties of various systems can be determined. The experimental setup was validated by a Pr-Cd isopiestic run, and the results are compared with the data reported in the literature.
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Affiliation(s)
- S Shyam Kumar
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - G Rajendra Prasad
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - J Prabhakar Rao
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - V Suresh Kumar
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - Rajesh Ganesan
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
| | - V Jayaraman
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India
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Premalatha S, Prabhu E, Gunasekaran G, Krithika P, Parthasarathy R, Jayaraman V. Design and development of heater control circuit without temperature sensor for monitoring hydrogen in argon. Rev Sci Instrum 2022; 93:015005. [PMID: 35104995 DOI: 10.1063/5.0057523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Accepted: 12/10/2021] [Indexed: 06/14/2023]
Abstract
A thin film based tin oxide sensor is developed to monitor low levels of hydrogen (concentration ranging from 5 to 75 ppm) in the cover gas plenum of the fast breeder test reactor. The heater and the sensor patterns are integrated on a miniature alumina substrate, and necessary electrical leads are incorporated into it. For proper functioning of the sensor, the heater has to be maintained at a constant temperature of 350 °C. This paper gives an outline of the electronics developed to measure the sensor signal and to control the heater temperature. The major challenge in this work is that there was no provision for embedding a temperature sensor on the heater surface due to physical constraints. This constrained the maintenance of a constant heater temperature for the proper functioning of the sensor. This led us to develop and demonstrate a heater control circuit without a temperature sensor to maintain a fixed temperature for monitoring hydrogen in argon, and electronics for the above-mentioned circuitry is discussed.
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Affiliation(s)
- S Premalatha
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - E Prabhu
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - G Gunasekaran
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - P Krithika
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - R Parthasarathy
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
| | - V Jayaraman
- Materials Chemistry and Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, India
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Melas M, Mathew MT, Mori M, Jayaraman V, Wilson SA, Martin C, Jacobson-Kelly AE, Kelly BJ, Magrini V, Mardis ER, Cottrell CE, Lee K. Somatic Variation as an Incidental Finding in the Pediatric Next Generation Sequencing Era. Cold Spring Harb Mol Case Stud 2021; 7:mcs.a006135. [PMID: 34716204 PMCID: PMC8751410 DOI: 10.1101/mcs.a006135] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Accepted: 10/27/2021] [Indexed: 11/28/2022] Open
Abstract
The methodologic approach used in next-generation sequencing (NGS) affords a high depth of coverage in genomic analysis. Inherent in the nature of genomic testing, there exists potential for identifying genomic findings that are incidental or secondary to the indication for clinical testing, with the frequency dependent on the breadth of analysis and the tissue sample under study. The interpretation and management of clinically meaningful incidental genomic findings is a pressing issue particularly in the pediatric population. Our study describes a 16-mo-old male who presented with profound global delays, brain abnormality, progressive microcephaly, and growth deficiency, as well as metopic craniosynostosis. Clinical exome sequencing (ES) trio analysis revealed the presence of two variants in the proband. The first was a de novo variant in the PPP2R1A gene (c.773G > A, p.Arg258His), which is associated with autosomal dominant (AD) intellectual disability, accounting for the proband's clinical phenotype. The second was a recurrent hotspot variant in the CBL gene (c.1111T > C, p.Tyr371His), which was present at a variant allele fraction of 11%, consistent with somatic variation in the peripheral blood sample. Germline pathogenic variants in CBL are associated with AD Noonan syndrome–like disorder with or without juvenile myelomonocytic leukemia. Molecular analyses using a different tissue source, buccal epithelial cells, suggest that the CBL alteration may represent a clonal population of cells restricted to leukocytes. This report highlights the laboratory methodologic and interpretative processes and clinical considerations in the setting of acquired variation detected during clinical ES in a pediatric patient.
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Affiliation(s)
- Marilena Melas
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital
| | - Mariam T Mathew
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital; Dept of Pathology, The Ohio State Univ; Dept of Pediatrics, The Ohio State University
| | - Mari Mori
- Dept of Pediatrics, The Ohio State University; Genetic and Genomic Medicine, Nationwide Children's Hospital
| | - Vijayakumar Jayaraman
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital
| | - Sarah A Wilson
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital
| | | | - Amanda E Jacobson-Kelly
- Dept of Pediatrics, The Ohio State University; Division of Hematology/Oncology/BMT, Nationwide Children's Hospital
| | - Ben J Kelly
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital
| | - Vincent Magrini
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital; Dept of Pediatrics, The Ohio State University
| | - Elaine R Mardis
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital; Dept of Pediatrics, The Ohio State University
| | - Catherine E Cottrell
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital; Dept of Pathology, The Ohio State University; Dept of Pediatrics, The Ohio State University
| | - Kristy Lee
- The Steve and Cindy Rasmussen Inst for Genomic Medicine, Nationwide Children's Hospital; Dept of Pathology, The Ohio State University; Dept of Pediatrics, The Ohio State University
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13
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Shyamkumar S, Prabhu E, Ghosh S, Premalatha S, Lakshmigandhan I, Muthu Ambika T, Sree Rama Murthy A, Reshmi P, Venkatesh M, Clinsha P, Ravindranath NA, Suresh Kumar V, Mahendran K, Gnanasekar K, Ganesan R, Jayaraman V. Hydrogen sensors for comprehensive detection of steam leak in sodium-cooled fast reactors. Nuclear Engineering and Design 2021. [DOI: 10.1016/j.nucengdes.2021.111388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Ravindranath NA, Lakshmigandhan I, Lakshmi K U, Gnanasekar K, Jayaraman V. Development of a YF3:ThF4 membrane for the possibility of determining fluoride. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109831] [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: 10/21/2022]
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15
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Ramakrishnan KM, Jayaraman V, Ramachandran K, Mathivanan T, Ravi R. Burn injury from cooking gas flame in a child of 6 years. Indian J Burns 2021. [DOI: 10.4103/ijb.ijb_28_21] [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] Open
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16
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Meyer A, Cottrell C, Reshmi S, Pfau R, Lee K, Mathew M, Corsmeier D, Jayaraman V, Dave-Wala A, Hashimoto S, Matthews T, Mouhlas D, Stein M, Waldrop M, Flanigan K. NEW GENES AND DISEASES / NGS & RELATED TECHNIQUES. Neuromuscul Disord 2020. [DOI: 10.1016/j.nmd.2020.08.325] [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: 11/30/2022]
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17
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Miller CR, Lee K, Pfau RB, Reshmi SC, Corsmeier DJ, Hashimoto S, Dave-Wala A, Jayaraman V, Koboldt D, Matthews T, Mouhlas D, Stein M, McKinney A, Grossman T, Kelly BJ, White P, Magrini V, Wilson RK, Mardis ER, Cottrell CE. Disease-associated mosaic variation in clinical exome sequencing: a two-year pediatric tertiary care experience. Cold Spring Harb Mol Case Stud 2020; 6:mcs.a005231. [PMID: 32371413 PMCID: PMC7304353 DOI: 10.1101/mcs.a005231] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 02/15/2020] [Accepted: 04/29/2020] [Indexed: 11/25/2022] Open
Abstract
Exome sequencing (ES) has become an important tool in pediatric genomic medicine, improving identification of disease-associated variation due to assay breadth. Depth is also afforded by ES, enabling detection of lower-frequency mosaic variation compared to Sanger sequencing in the studied tissue, thus enhancing diagnostic yield. Within a pediatric tertiary-care hospital, we report two years of clinical ES data from probands evaluated for genetic disease to assess diagnostic yield, characteristics of causal variants, and prevalence of mosaicism among disease-causing variants. Exome-derived, phenotype-driven variant data from 357 probands was analyzed concurrent with parental ES data, when available. Blood was the source of nucleic acid. Sequence read alignments were manually reviewed for all assessed variants. Sanger sequencing was used for suspected de novo or mosaic variation. Clinical provider notes were reviewed to determine concordance between laboratory-reported data and the ordering provider's interpretation of variant-associated disease causality. Laboratory-derived diagnostic yield and provider-substantiated diagnoses had 91.4% concordance. The cohort returned 117 provider-substantiated diagnoses among 115 probands for a diagnostic yield of 32.2%. De novo variants represented 64.9% of disease-associated variation within trio analyses. Among the 115 probands, five harbored disease-associated somatic mosaic variation. Two additional probands were observed to inherit a disease-associated variant from an unaffected mosaic parent. Among inheritance patterns, de novo variation was the most frequent disease etiology. Somatic mosaicism is increasingly recognized as a significant contributor to genetic disease, particularly with increased sequence depth attainable from ES. This report highlights the potential and importance of detecting mosaicism in ES.
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Affiliation(s)
- Cecelia R Miller
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pathology
| | - Kristy Lee
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pathology
| | - Ruthann B Pfau
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pathology.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Shalini C Reshmi
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pathology.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Donald J Corsmeier
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Sayaka Hashimoto
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Ashita Dave-Wala
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Vijayakumar Jayaraman
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Daniel Koboldt
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Theodora Matthews
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Danielle Mouhlas
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Maggie Stein
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Aimee McKinney
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Tom Grossman
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Benjamin J Kelly
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA
| | - Peter White
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Vincent Magrini
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Richard K Wilson
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Elaine R Mardis
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
| | - Catherine E Cottrell
- The Steve and Cindy Rasmussen Institute for Genomic Medicine, Nationwide Children's Hospital, Columbus, Ohio 43205, USA.,Department of Pathology.,Department of Pediatrics, The Ohio State University, Columbus, Ohio 43210, USA
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18
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Melas M, Mathew M, Jayaraman V, Martin C, Mori M, Jacobson-Kelly AE, Cottrell C, Lee K. 35. Mosaicism as incidental finding in the pediatric next generation sequencing era. Cancer Genet 2020. [DOI: 10.1016/j.cancergen.2020.04.039] [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: 11/26/2022]
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19
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Keshari AK, Prabhakar Rao J, Sree Rama Murthy A, Jayaraman V. Design and development of instrumentation for the measurement of sensor array responses. Rev Sci Instrum 2020; 91:024101. [PMID: 32113421 DOI: 10.1063/1.5128967] [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] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Accepted: 01/30/2020] [Indexed: 06/10/2023]
Abstract
Indigenous instrumentation has been designed and developed for the measurement of the concentration of analytes from eight conductometric metal oxide sensors. The hardware scheme of instrumentation is based on the astable multivibrator configuration. The hardware measures the resistance output from the sensors, conditions, processes, and displays the data on the liquid crystal display. An 8051 based processor averages the data, converts them into engineering units, and sends them to remote PC through ethernet communication for post-data analysis. A graphical user interface (GUI) is developed to acquire, monitor, and display the eight channels' sensor output. GUI plots the online data and offline data as a popup window. The hardware and software of the instrument were tested with standard resistors for calibration and found that in-house developed instrumentation is able to measure with an accuracy of ±0.5% with a resolution of 500 Ω. The instrument has been tested with a semiconductor metal oxide sensor, viz., chromium niobate (CrNbO4).
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Affiliation(s)
- Ajay Kumar Keshari
- Homi Bhabha National Institute, Mumbai, India and IGCAR Campus, Kalpakkam, Tamil Nadu 603102, India
| | - J Prabhakar Rao
- Materials & Fuel Chemistry Group, Materials Chemistry & Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - A Sree Rama Murthy
- Materials & Fuel Chemistry Group, Materials Chemistry & Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
| | - V Jayaraman
- Materials & Fuel Chemistry Group, Materials Chemistry & Metal Fuel Cycle Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu 603102, India
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20
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Joshi S, Ajikumar P, Sivasubramanian K, Jayaraman V. Synthesis, characterization and low energy photon attenuation studies of bone tissue substitutes. Journal of Polymer Engineering 2020. [DOI: 10.1515/polyeng-2019-0179] [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] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractEpoxy composites with different weight percentages of calcium carbonate and calcium phosphate were synthesized as bone tissue substitutes (BTS) for internal dosimetry. The Fourier-transform infrared spectroscopy analysis confirmed that no chemical reaction occurred between the polymer and the fillers. Thermogravimetric analysis also showed improvement in the thermal properties of the composites due to the fillers. The uniform distribution of fillers in the epoxy matrix was established by X-ray radiography. The attenuation behavior of BTS was probed for low energy γ source 241Am (59.5 keV) using planar HPGe detector. The measured mass attenuation coefficients of BTS were found to match with the values calculated using XCOM software. The radiological properties derived for these composites were found to be on par with those of ICRU-44 cortical bone and B-100 bone equivalent plastic.
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Affiliation(s)
- Shailesh Joshi
- Radiological and Environmental Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, Tamilnadu, India
- Homi Bhabha National Institute, Indira Gandhi Centre for Atomic Research, R No. 207, HASL Building, Kalpakkam 603102, Tamilnadu, India
| | - P.K. Ajikumar
- Surface and Nanoscience Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - K. Sivasubramanian
- Radiological and Environmental Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - V. Jayaraman
- Materials Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
- Homi Bhabha National Institute, IGCAR, Kalpakkam, Tamilnadu, India
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21
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Affiliation(s)
- J Meenakshi
- Biomaterials Division, Central Leather Research Institute, TICEL Bio Park, Taramani, Chennai-600113, India
| | - V Jayaraman
- Division of Plastic Surgery, Kilpauk Medical College and Hospital, Chennai-600010. India
| | - K M Ramakrishnan
- Surgery and Burn Intensive Care Unit, K. K. CHILDS Trust Hospital, Chennai-600034, India
| | - M Babu
- Biomaterials Division, Central Leather Research Institute, TICEL Bio Park, Taramani, Chennai-600113, India
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22
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Ramakrishnan KM, Ramachandran B, Ravikumar KG, Ravikumar K, Putli S, Jayaraman V, Mathivanan T, Ravi R, Gnanamani S, Babu M. Electrical injury in pediatric patients – A case series. Indian J Burns 2020. [DOI: 10.4103/ijb.ijb_27_19] [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] Open
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23
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Ramakrishnan KM, Ramachandran B, Ravikumar KG, Ravikumar K, Putli S, Jayaraman V, Mathivanan, Ravi, Ganamani A, Babu M. Management of Acinetobacter baumannii infection of burn wound with the evidence of sepsis. Indian J Burns 2019. [DOI: 10.4103/ijb.ijb_12_19] [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] Open
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24
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Sheppard S, Biswas S, Li MH, Jayaraman V, Slack I, Romasko EJ, Sasson A, Brunton J, Rajagopalan R, Sarmady M, Abrudan JL, Jairam S, DeChene ET, Ying X, Choi J, Wilkens A, Raible SE, Scarano MI, Santani A, Pennington JW, Luo M, Conlin LK, Devkota B, Dulik MC, Spinner NB, Krantz ID. Utility and limitations of exome sequencing as a genetic diagnostic tool for children with hearing loss. Genet Med 2018; 20:1663-1676. [PMID: 29907799 PMCID: PMC6295269 DOI: 10.1038/s41436-018-0004-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [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: 09/08/2017] [Accepted: 03/20/2018] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Hearing loss (HL) is the most common sensory disorder in children. Prompt molecular diagnosis may guide screening and management, especially in syndromic cases when HL is the single presenting feature. Exome sequencing (ES) is an appealing diagnostic tool for HL as the genetic causes are highly heterogeneous. METHODS ES was performed on a prospective cohort of 43 probands with HL. Sequence data were analyzed for primary and secondary findings. Capture and coverage analysis was performed for genes and variants associated with HL. RESULTS The diagnostic rate using ES was 37.2%, compared with 15.8% for the clinical HL panel. Secondary findings were discovered in three patients. For 247 genes associated with HL, 94.7% of the exons were targeted for capture and 81.7% of these exons were covered at 20× or greater. Further analysis of 454 randomly selected HL-associated variants showed that 89% were targeted for capture and 75% were covered at a read depth of at least 20×. CONCLUSION ES has an improved yield compared with clinical testing and may capture diagnoses not initially considered due to subtle clinical phenotypes. Technical challenges were identified, including inadequate capture and coverage of HL genes. Additional considerations of ES include secondary findings, cost, and turnaround time.
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Affiliation(s)
- Sarah Sheppard
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Sawona Biswas
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Mindy H Li
- Division of Genetics, Department of Pediatrics, Rush University Medical Center, Chicago, IL, USA
| | - Vijayakumar Jayaraman
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Ian Slack
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Edward J Romasko
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Ariella Sasson
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Joshua Brunton
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Ramakrishnan Rajagopalan
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Mahdi Sarmady
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Jenica L Abrudan
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Sowmya Jairam
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - Elizabeth T DeChene
- Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Xiahoan Ying
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Jiwon Choi
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Alisha Wilkens
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Sarah E Raible
- Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Maria I Scarano
- Division of Genetics, Cooper University Health Care, Camden, NY, USA
| | - Avni Santani
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Jeffrey W Pennington
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Minjie Luo
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Laura K Conlin
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Batsal Devkota
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Matthew C Dulik
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Nancy B Spinner
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Ian D Krantz
- Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
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25
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Romasko EJ, Devkota B, Biswas S, Jayaraman V, Rajagopalan R, Dulik MC, Thom CS, Choi J, Jairam S, Scarano MI, Krantz ID, Spinner NB, Conlin LK, Lambert MP. Utility and limitations of exome sequencing in the molecular diagnosis of pediatric inherited platelet disorders. Am J Hematol 2018; 93:8-16. [PMID: 28960434 DOI: 10.1002/ajh.24917] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 09/21/2017] [Accepted: 09/23/2017] [Indexed: 12/21/2022]
Abstract
Inherited platelet disorders (IPD) are a heterogeneous group of rare disorders that affect platelet number and function and often predispose to other significant medical complications. In spite of the identification of over 50 IPD disease-associated genes, a molecular diagnosis is only identified in a minority (10%) of affected patients without a clinically suspected etiology. We studied a cohort of 21 pediatric patients with suspected IPDs by exome sequencing (ES) to: (1) examine the performance of the exome test for IPD genes, (2) determine if this exome-wide diagnostic test provided a higher diagnostic yield than has been previously reported, (3) to evaluate the frequency of variants of uncertain significance identified, and (4) to identify candidate variants for functional evaluation in patients with an uncertain or negative diagnosis. We established a high priority gene list of 53 genes, evaluated exome capture kit performance, and determined the coverage for these genes and disease-related variants. We identified likely disease causing variants in 5 of the 21 probands (23.8%) and variants of uncertain significance in 52% of patients studied. In conclusion, ES has the potential to molecularly diagnose causes of IPD, and to identify candidate genes for functional evaluation. Robust exome sequencing also requires that coverage of genes known to be associated with clinical findings of interest need to be carefully examined and supplemented if necessary. Clinicians who undertake ES should understand the limitations of the test and the full significance of results that may be returned.
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Affiliation(s)
- Edward J. Romasko
- Division of Human Genetics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Batsal Devkota
- Department of Biomedical and Health Informatics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Sawona Biswas
- Division of Human Genetics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Vijayakumar Jayaraman
- Division of Human Genetics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Ramakrishnan Rajagopalan
- Department of Biomedical and Health Informatics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Matthew C. Dulik
- Division of Genomic Diagnostics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Christopher S. Thom
- Department of Pediatrics; University of Pennsylvania School of Medicine, Philadelphia; Philadelphia Pennsylvania
| | - Jiwon Choi
- Division of Human Genetics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
| | - Sowmya Jairam
- Department of Pathology; Memorial Sloan Kettering Cancer Center; New York New York
| | | | - Ian D. Krantz
- Division of Human Genetics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
- Department of Pediatrics; University of Pennsylvania School of Medicine, Philadelphia; Philadelphia Pennsylvania
| | - Nancy B. Spinner
- Division of Genomic Diagnostics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
- Department of Pathology and Laboratory Medicine; University of Pennsylvania School of Medicine; Philadelphia Pennsylvania
| | - Laura K. Conlin
- Division of Genomic Diagnostics; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
- Department of Pathology and Laboratory Medicine; University of Pennsylvania School of Medicine; Philadelphia Pennsylvania
| | - Michele P. Lambert
- Department of Pediatrics; University of Pennsylvania School of Medicine, Philadelphia; Philadelphia Pennsylvania
- Division of Hematology; Children's Hospital of Philadelphia; Philadelphia Pennsylvania
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26
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Ramakrishnan KM, Ramachandran B, Ravi R, Mathivanan T, Ravikumar KG, Jayaraman V. Decompression escharotomies of burns in children between the ages 0 and 18 years. Indian J Burns 2018. [DOI: 10.4103/ijb.ijb_7_18] [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] Open
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Ramakrishnan KM, Ramachandran B, Ravikumar KG, Ravikumar K, Ramkumar R, Jayaraman V, Mathivanan T. Exfoliative diseases of the integument and mucous membrane that mimic deep 2 nd-degree burns with or without sepsis. Indian J Burns 2018. [DOI: 10.4103/ijb.ijb_28_18] [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] Open
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de Kovel CGF, Syrbe S, Brilstra EH, Verbeek N, Kerr B, Dubbs H, Bayat A, Desai S, Naidu S, Srivastava S, Cagaylan H, Yis U, Saunders C, Rook M, Plugge S, Muhle H, Afawi Z, Klein KM, Jayaraman V, Rajagopalan R, Goldberg E, Marsh E, Kessler S, Bergqvist C, Conlin LK, Krok BL, Thiffault I, Pendziwiat M, Helbig I, Polster T, Borggraefe I, Lemke JR, van den Boogaardt MJ, Møller RS, Koeleman BPC. Neurodevelopmental Disorders Caused by De Novo Variants in KCNB1 Genotypes and Phenotypes. JAMA Neurol 2017; 74:1228-1236. [PMID: 28806457 DOI: 10.1001/jamaneurol.2017.1714] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Importance Knowing the range of symptoms seen in patients with a missense or loss-of-function variant in KCNB1 and how these symptoms correlate with the type of variant will help clinicians with diagnosis and prognosis when treating new patients. Objectives To investigate the clinical spectrum associated with KCNB1 variants and the genotype-phenotype correlations. Design, Setting, and Participants This study summarized the clinical and genetic information of patients with a presumed pathogenic variant in KCNB1. Patients were identified in research projects or during clinical testing. Information on patients from previously published articles was collected and authors contacted if feasible. All patients were seen at a clinic at one of the participating institutes because of presumed genetic disorder. They were tested in a clinical setting or included in a research project. Main Outcomes and Measures The genetic variant and its inheritance and information on the patient's symptoms and characteristics in a predefined format. All variants were identified with massive parallel sequencing and confirmed with Sanger sequencing in the patient. Absence of the variant in the parents could be confirmed with Sanger sequencing in all families except one. Results Of 26 patients (10 female, 15 male, 1 unknown; mean age at inclusion, 9.8 years; age range, 2-32 years) with developmental delay, 20 (77%) carried a missense variant in the ion channel domain of KCNB1, with a concentration of variants in region S5 to S6. Three variants that led to premature stops were located in the C-terminal and 3 in the ion channel domain. Twenty-one of 25 patients (84%) had seizures, with 9 patients (36%) starting with epileptic spasms between 3 and 18 months of age. All patients had developmental delay, with 17 (65%) experiencing severe developmental delay; 14 (82%) with severe delay had behavioral problems. The developmental delay was milder in 4 of 6 patients with stop variants and in a patient with a variant in the S2 transmembrane element rather than the S4 to S6 region. Conclusions and Relevance De novo KCNB1 missense variants in the ion channel domain and loss-of-function variants in this domain and the C-terminal likely cause neurodevelopmental disorders with or without seizures. Patients with presumed pathogenic variants in KCNB1 have a variable phenotype. However, the type and position of the variants in the protein are (imperfectly) correlated with the severity of the disorder.
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Affiliation(s)
- Carolien G F de Kovel
- Department of Genetics, University Medical Center Utrecht, Utrecht, the Netherlands.,Department of Language and Genetics, Max Planck Institute for Psycholinguistics, Nijmegen, the Netherlands
| | - Steffen Syrbe
- Division of Child Neurology and Inherited Metabolic Diseases, Department of General Pediatrics, Center for Pediatrics and Adolescent Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Eva H Brilstra
- Department of Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Nienke Verbeek
- Department of Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Bronwyn Kerr
- Institute of Evolution, Systems and Genomics, Faculty of Medical and Human Sciences, University of Manchester, Manchester, England.,Manchester Centre For Genomic Medicine, Central Manchester University Hospitals National Health Service Foundation Trust, Manchester, England.,Manchester Academic Health Science Centre, Manchester, England
| | - Holly Dubbs
- Division of Neurology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Allan Bayat
- Department of Pediatrics, University Hospital of Hvidovre, Copenhagen, Denmark
| | - Sonal Desai
- Department of Neurogenetics, Kennedy Krieger Institute, Baltimore, Maryland
| | - Sakkubai Naidu
- Department of Neurology and Pediatrics, Johns Hopkins School of Medicine, Baltimore, Maryland.,Hugo Moser Research Institute, Kennedy Krieger Institute, Baltimore, Maryland
| | | | - Hande Cagaylan
- Department of Molecular Biology and Genetics, Bogaziçi University, Istanbul, Turkey
| | - Uluc Yis
- Division of Child Neurology, Department of Pediatrics, School of Medicine, Dokuz Eylül University, İzmir, Turkey
| | - Carol Saunders
- Center for Pediatric Genomic Medicine, Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, Missouri.,Department of Pediatrics, Children's Mercy Hospital, Kansas City, Missouri.,Pediatric Pathology and Laboratory Medicine, University of Missouri-Kansas City School of Medicine, Kansas City
| | - Martin Rook
- Department of Medical Physiology, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Susanna Plugge
- Department of Biomedical Sciences, University Medical Center Utrecht, Utrecht, the Netherlands
| | - Hiltrud Muhle
- Department of Neuropediatrics, University Medical Center Schleswig-Holstein, Christian Albrechts University, Kiel, Germany
| | - Zaid Afawi
- Department of Physiology and Pharmacology, Tel Aviv University Medical School, Ramat Aviv, Israel
| | - Karl-Martin Klein
- Department of Neurology, Epilepsy Center Frankfurt Rhine-Main, Center of Neurology and Neurosurgery, University Hospital, Goethe-University Frankfurt, Frankfurt, Germany
| | - Vijayakumar Jayaraman
- Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Ramakrishnan Rajagopalan
- Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Ethan Goldberg
- Division of Neurology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Eric Marsh
- Division of Neurology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Sudha Kessler
- Division of Neurology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Christina Bergqvist
- Division of Neurology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Laura K Conlin
- Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Bryan L Krok
- Division of Genomic Diagnostics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Isabelle Thiffault
- Center for Pediatric Genomic Medicine, Department of Pathology and Laboratory Medicine, Children's Mercy Hospital, Kansas City, Missouri.,Department of Pediatrics, Children's Mercy Hospital, Kansas City, Missouri
| | - Manuela Pendziwiat
- Department of Neuropediatrics, University Medical Center Schleswig-Holstein, Christian Albrechts University, Kiel, Germany
| | - Ingo Helbig
- Division of Neurology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.,University Medical Center Schleswig-Holstein, Christian Albrechts University, Kiel, Germany
| | - Tilman Polster
- Epilepsiezentrum Bethel, Krankenhaus Mara, Kinderepileptologie, Bielefeld, Germany
| | - Ingo Borggraefe
- Department of Pediatric Neurology, Developmental Medicine and Social Pediatrics Dr. von Hauner's Children's Hospital, University of Munich, Munich, Germany
| | - Johannes R Lemke
- Institute of Human Genetics, University of Leipzig Hospitals and Clinics, Leipzig, Germany
| | | | - Rikke S Møller
- Danish Epilepsy Centre, Dianalund, Denmark.,Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Bobby P C Koeleman
- Department of Genetics, University Medical Center Utrecht, Utrecht, the Netherlands
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Rajagopalan R, McEldrew D, Vaidiswaran P, Zaykaner M, Jayaraman V, McCaffrey J, Sibert J, Xiao M, Conlin L. Investigating Structural Variation Using Optical Genome Mapping Technology. Cancer Genet 2017. [DOI: 10.1016/j.cancergen.2017.04.023] [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: 11/29/2022]
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Rajagopalan R, Devkota B, Jayaraman V, Biswas S, Spinner NB, Krantz ID, Conlin LK. Copy Number Detection in Exome Sequencing Compared to Chromosomal Microarray in a Clinical Setting. Cancer Genet 2016. [DOI: 10.1016/j.cancergen.2016.04.052] [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: 11/29/2022]
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Sree Rama Murthy A, Pathak D, Sharma G, Gnanasekar KI, Jayaraman V, Umarji AM, Gnanasekaran T. Application of principal component analysis to gas sensing characteristics of Cr0.8Fe0.2NbO4 thick film array. Anal Chim Acta 2015; 892:175-82. [PMID: 26388489 DOI: 10.1016/j.aca.2015.08.034] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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: 06/26/2015] [Revised: 08/09/2015] [Accepted: 08/14/2015] [Indexed: 11/19/2022]
Abstract
The transient changes in resistances of Cr0.8Fe0.2NbO4 thick film sensors towards specified concentrations of H2, NH3, acetonitrile, acetone, alcohol, cyclohexane and petroleum gas at different operating temperatures were recorded. The analyte-specific characteristics such as slopes of the response and retrace curves, area under the curve and sensitivity deduced from the transient curve of the respective analyte gas have been used to construct a data matrix. Principal component analysis (PCA) was applied to this data and the score plot was obtained. Distinguishing one reducing gas from the other is demonstrated based on this approach, which otherwise is not possible by measuring relative changes in conductivity. This methodology is extended for three Cr0.8Fe0.2NbO4 thick film sensor array operated at different temperatures.
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Affiliation(s)
- A Sree Rama Murthy
- Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India.
| | - Dhruv Pathak
- Physics Department, Harish-Chandra Research Institute, Allahabad 211019, India
| | - Gautam Sharma
- Physics Department, Harish-Chandra Research Institute, Allahabad 211019, India
| | - K I Gnanasekar
- Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - V Jayaraman
- Materials Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
| | - A M Umarji
- Materials Research Centre, Indian Institute of Science, Bangalore 560012, India
| | - T Gnanasekaran
- RajaRamanna Fellow, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India
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Goldufsky J, Wood SJ, Jayaraman V, Majdobeh O, Chen L, Qin S, Zhang C, DiPietro LA, Shafikhani SH. Pseudomonas aeruginosa uses T3SS to inhibit diabetic wound healing. Wound Repair Regen 2015; 23:557-64. [PMID: 25912785 DOI: 10.1111/wrr.12310] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 04/22/2015] [Indexed: 12/16/2022]
Abstract
Diabetic foot ulcers are responsible for more hospitalizations than any other complication of diabetes. Bacterial infection is recognized as an important factor associated with impaired healing in diabetic ulcers. Pseudomonas aeruginosa is the most frequently detected Gram-negative pathogen in diabetic ulcers. P. aeruginosa infection has been shown to impair healing in diabetic wounds in a manner that correlates with its ability to form biofilm. While the majority of infections in diabetic ulcers are biofilm associated, 33% of infections are nonbiofilm in nature. P. aeruginosa is the most prevalent Gram-negative pathogen in all diabetic wound types, which suggests that the deleterious impact of P. aeruginosa on healing in diabetic wounds goes beyond its ability to form biofilm and likely involves other factors. The Type III Secretion System (T3SS) virulence structure is required for the pathogenesis of all P. aeruginosa clinical isolates, suggesting that it may also play a role in the inhibition of wound repair in diabetic skin ulcers. We evaluated the role of T3SS in mediating P. aeruginosa-induced tissue damage in the wounds of diabetic mice. Our data demonstrate that P. aeruginosa establishes a robust and persistent infection in diabetic wounds independent of its ability to form biofilm and causes severe wound damage in a manner that primarily depends on its T3SS.
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Affiliation(s)
- Josef Goldufsky
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Stephen J Wood
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Vijayakumar Jayaraman
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Omar Majdobeh
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois
| | - Lin Chen
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Shanshan Qin
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois
| | - Chunxiang Zhang
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois
| | - Luisa A DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois
| | - Sasha H Shafikhani
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois.,Department of Internal Medicine, Rush University Medical Center, Chicago, Illinois.,Cancer Center, Rush University Medical Center Chicago, Illinois
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Li MH, Abrudan JL, Dulik MC, Sasson A, Brunton J, Jayaraman V, Dugan N, Haley D, Rajagopalan R, Biswas S, Sarmady M, DeChene ET, Deardorff MA, Wilkens A, Noon SE, Scarano MI, Santani AB, White PS, Pennington J, Conlin LK, Spinner NB, Krantz ID, Vetter VL. Utility and limitations of exome sequencing as a genetic diagnostic tool for conditions associated with pediatric sudden cardiac arrest/sudden cardiac death. Hum Genomics 2015; 9:15. [PMID: 26187847 PMCID: PMC4506570 DOI: 10.1186/s40246-015-0038-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 05/12/2015] [Accepted: 07/09/2015] [Indexed: 11/23/2022] Open
Abstract
Background Conditions associated with sudden cardiac arrest/death (SCA/D) in youth often have a genetic etiology. While SCA/D is uncommon, a pro-active family screening approach may identify these inherited structural and electrical abnormalities prior to symptomatic events and allow appropriate surveillance and treatment. This study investigated the diagnostic utility of exome sequencing (ES) by evaluating the capture and coverage of genes related to SCA/D. Methods Samples from 102 individuals (13 with known molecular etiologies for SCA/D, 30 individuals without known molecular etiologies for SCA/D and 59 with other conditions) were analyzed following exome capture and sequencing at an average read depth of 100X. Reads were mapped to human genome GRCh37 using Novoalign, and post-processing and analysis was done using Picard and GATK. A total of 103 genes (2,190 exons) related to SCA/D were used as a primary filter. An additional 100 random variants within the targeted genes associated with SCA/D were also selected and evaluated for depth of sequencing and coverage. Although the primary objective was to evaluate the adequacy of depth of sequencing and coverage of targeted SCA/D genes and not for primary diagnosis, all patients who had SCA/D (known or unknown molecular etiologies) were evaluated with the project’s variant analysis pipeline to determine if the molecular etiologies could be successfully identified. Results The majority of exons (97.6 %) were captured and fully covered on average at minimum of 20x sequencing depth. The proportion of unique genomic positions reported within poorly covered exons remained small (4 %). Exonic regions with less coverage reflect the need to enrich these areas to improve coverage. Despite limitations in coverage, we identified 100 % of cases with a prior known molecular etiology for SCA/D, and analysis of an additional 30 individuals with SCA/D but no known molecular etiology revealed a diagnostic answer in 5/30 (17 %). We also demonstrated 95 % of 100 randomly selected reported variants within our targeted genes would have been picked up on ES based on our coverage analysis. Conclusions ES is a helpful clinical diagnostic tool for SCA/D given its potential to successfully identify a molecular diagnosis, but clinicians should be aware of limitations of available platforms from technical and diagnostic perspectives. Electronic supplementary material The online version of this article (doi:10.1186/s40246-015-0038-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Mindy H Li
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Jenica L Abrudan
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Matthew C Dulik
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Ariella Sasson
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Joshua Brunton
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Vijayakumar Jayaraman
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Noreen Dugan
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Cardiology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Danielle Haley
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Cardiology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Ramakrishnan Rajagopalan
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Sawona Biswas
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA.
| | - Mahdi Sarmady
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Elizabeth T DeChene
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Matthew A Deardorff
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Alisha Wilkens
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Sarah E Noon
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Maria I Scarano
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Avni B Santani
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Peter S White
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA. .,Division of Oncology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA. .,Present address: Department of Pediatrics, Cincinnati Children's Hospital and Medical Center, and Department of Biomedical Informatics, College of Medicine, University of Cincinnati, Cincinnati, OH, USA.
| | - Jeffrey Pennington
- Department of Biomedical and Health Informatics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Laura K Conlin
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Nancy B Spinner
- Department of Pathology & Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
| | - Ian D Krantz
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Human Genetics, The Children's Hospital of Philadelphia, Abramson Research Center, Room 1012G, 3615 Civic Center Blvd, Philadelphia, PA, 19104, USA.
| | - Victoria L Vetter
- Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA. .,Division of Cardiology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
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Tilton RK, Noon SE, Wilkens A, Jayaraman V, Brunton J, Krantz ID, Germiller JA. Utilization of Exome Sequencing for Diagnosis and Discovery of Genetic Causes of Sensorineural Hearing Loss. Otolaryngol Head Neck Surg 2014. [DOI: 10.1177/0194599814541629a347] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objectives: Exome sequencing (ES) is a single platform test that screens the exons of nearly all genes and is increasingly being used in the clinical diagnosis of hearing loss due to the large number of genes etiologically implicated. Our goals were to explore (1) the utility and limitations of ES for diagnosis in children with sensorineural hearing loss (SNHL) and (2) its ability to discover novel genes causing SNHL. Methods: Thirty-six children with bilateral SNHL underwent ES: 26 without an etiology for their SNHL after standard clinical testing, and a control group of 10 with known mutations. Exome variants were initially filtered using a list of 264 genes associated with hearing loss. Results: In the 10 children with known mutations, all were correctly identified by ES except 3 large deletions. Analysis of the 26 unknown samples found likely pathogenic mutations in 8 (31%). A definitive diagnosis was obtained in 1 additional child, who had an unusual MITF mutation that led to the diagnosis of Waardenburg syndrome. In one other family, a novel candidate gene was identified which previously has never been implicated in human disease. Affected children in that family had profound SNHL accompanied by malformation of the vestibular labyrinth. Mutations in this gene segregated as expected among the 8 family members. Conclusions: ES is a powerful tool for both diagnosis and discovery for genetically heterogeneous conditions like SNHL. Despite limitations inherent to using gene lists and only sequencing exons, this technology has great promise for helping ascertain the etiology of SNHL in children.
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Sree Rama Murthy A, Kumar AA, Prabhu E, Clinsha P, Lakshmigandhan I, Chandramouli S, Mahendran K, Gnanasekar K, Jayaraman V, Nashine B, Rajan K, Gnanasekaran T. Performance of semiconducting oxide based hydrogen sensor for argon cover gas in engineering scale sodium facility. Nuclear Engineering and Design 2014. [DOI: 10.1016/j.nucengdes.2014.01.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wood S, Jayaraman V, Huelsmann EJ, Bonish B, Burgad D, Sivaramakrishnan G, Qin S, DiPietro LA, Zloza A, Zhang C, Shafikhani SH. Pro-inflammatory chemokine CCL2 (MCP-1) promotes healing in diabetic wounds by restoring the macrophage response. PLoS One 2014; 9:e91574. [PMID: 24618995 PMCID: PMC3950222 DOI: 10.1371/journal.pone.0091574] [Citation(s) in RCA: 173] [Impact Index Per Article: 17.3] [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: 08/26/2013] [Accepted: 02/13/2014] [Indexed: 01/13/2023] Open
Abstract
Prior studies suggest that the impaired healing seen in diabetic wounds derives from a state of persistent hyper-inflammation characterized by harmful increases in inflammatory leukocytes including macrophages. However, such studies have focused on wounds at later time points (day 10 or older), and very little attention has been given to the dynamics of macrophage responses in diabetic wounds early after injury. Given the importance of macrophages for the process of healing, we studied the dynamics of macrophage response during early and late phases of healing in diabetic wounds. Here, we report that early after injury, the diabetic wound exhibits a significant delay in macrophage infiltration. The delay in the macrophage response in diabetic wounds results from reduced Chemokine (C-C motif) ligand 2 (CCL2) expression. Importantly, one-time treatment with chemoattractant CCL2 significantly stimulated healing in diabetic wounds by restoring the macrophage response. Our data demonstrate that, rather than a hyper-inflammatory state; the early diabetic wound exhibits a paradoxical and damaging decrease in essential macrophage response. Our studies suggest that the restoration of the proper kinetics of macrophage response may be able to jumpstart subsequent healing stages. CCL2 chemokine-based therapy may be an attractive strategy to promote healing in diabetic wounds.
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Affiliation(s)
- Stephen Wood
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Vijayakumar Jayaraman
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Erica J. Huelsmann
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Rush University Cancer Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Developmental Center for AIDS Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Brian Bonish
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Department of Dermatology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Derick Burgad
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Gayathri Sivaramakrishnan
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Shanshan Qin
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Luisa A. DiPietro
- Center for Wound Healing and Tissue Regeneration, College of Dentistry, University of Illinois at Chicago, Chicago, Illinois, United States of America
| | - Andrew Zloza
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Rush University Cancer Center, Rush University Medical Center, Chicago, Illinois, United States of America
- Developmental Center for AIDS Research, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Chunxiang Zhang
- Department of Pharmacology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Sasha H. Shafikhani
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
- Rush University Cancer Center, Rush University Medical Center, Chicago, Illinois, United States of America
- * E-mail:
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Ramakrishnan M, Babu M, Jayaraman V, Mathivanan T. Scar biology: Fibroblast the key modulator. Indian J Burns 2014. [DOI: 10.4103/0971-653x.146990] [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] Open
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Mathangi Ramakrishnan K, Babu M, Mathivanan, Jayaraman V, Shankar J. Advantages of collagen based biological dressings in the management of superficial and superficial partial thickness burns in children. Ann Burns Fire Disasters 2013; 26:98-104. [PMID: 24133405 PMCID: PMC3793887] [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] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Indexed: 11/11/2023]
Abstract
Collagen based dressings for acute burn wound management have been extensively used in India, particularly in the city of Chennai. Due to the high levels of humidity in our city, closed dressings become infected and treatment with topical antimicrobials, like Silver Sulfadiazine cream, quickly become desiccated. Collagen membrane dressings were manufactured by the biomaterial laboratory of the Central Leather Research Institute (CLRI), Government of India in Chennai, and then the process was patented. Collagen was extracted from bovine skin and Achilles tendons, and then reconstituted. This was used on burn wounds as dressings after clearance from the Institutional Review Board and Ethics Committees of the Hospital and CLRI. Continued research in this field to enable resulted in the design of silver sulphadiazine loaded alginate microspheres which were embedded in the reconstituted collagen. Controlled delivery of silver sulphadiazine. This collagen membrane was used in chronic infected burns. Low molecular weight heparin was given subcutaneously to improve wound healing in burn injuries and collagen membrane dressings were also applied. After several trials the process technology was patented. The advantages and disadvantages of the collagen membrane cover is elaborated in a group of 487 pediatric burn patients. The trial was conducted at the burn unit of Kanchi Kamakoti Childs Trust Hospital (KKCTH) in Chennai, India.
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Affiliation(s)
- K Mathangi Ramakrishnan
- Childs Trust Medical Research Foundation and Kanchi Kamakoti Childs Trust Hospital, Chennai, India
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Mahmood F, Hakimiyan A, Jayaraman V, Wood S, Sivaramakrishnan G, Rehman T, Reuhs BL, Chubinskaya S, Shafikhani SH. A novel human antimicrobial factor targets Pseudomonas aeruginosa through its type III secretion system. J Med Microbiol 2013; 62:531-539. [PMID: 23288430 DOI: 10.1099/jmm.0.051227-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Pseudomonas aeruginosa is an important opportunistic bacterial pathogen. Despite its metabolic and virulence versatility, it has not been shown to infect articular joints, which are areas that are rarely infected with bacteria in general. We hypothesized that articular joints possess antimicrobial activity that limits bacterial survival in these environments. We report that cartilages secrete a novel antimicrobial factor, henceforth referred to as the cartilage-associated antimicrobial factor (CA-AMF), with potent antimicrobial activity. Importantly, CA-AMF exhibited significantly more antimicrobial activity against P. aeruginosa strains with a functional type III secretion system (T3SS). We propose that CA-AMF represents a new class of human antimicrobial factors in innate immunity, one which has evolved to selectively target pathogenic bacteria among the beneficial and commensal microflora. The T3SS is the first example, to the best of our knowledge, of a pathogen-specific molecular target in this antimicrobial defence system.
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Affiliation(s)
- Fareeha Mahmood
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, IL 60612, USA
| | - Arnavaz Hakimiyan
- Department of Food Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Vijayakumar Jayaraman
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, IL 60612, USA
| | - Stephen Wood
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, IL 60612, USA
| | | | - Tooba Rehman
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, IL 60612, USA
| | - Bradley L Reuhs
- Department of Food Sciences, Purdue University, West Lafayette, IN 47907, USA
| | - Susanna Chubinskaya
- Department of Biochemistry, Rush University Medical Center, Chicago, IL 60612, USA
| | - Sasha H Shafikhani
- Department of Immunology/Microbiology, Rush University Medical Center, Chicago, IL 60612, USA
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Jayaraman V, Cole G, Robertson M, Burgner C, John D, Uddin A, Cable A. Rapidly swept, ultra-widely-tunable 1060 nm MEMS-VCSELs. Electron Lett 2012; 48:1331-1333. [PMID: 23520409 PMCID: PMC3601947 DOI: 10.1049/el.2012.3180] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Demonstrated are 1060 nm microelectromechanical-systems-based tunable vertical-cavity surface-emitting lasers (MEMS-VCSELs) with a 100 nm continuous tuning range under repetitively scanned operation at rates beyond 500 kHz and a 90 nm continuous tuning range under static operation. These devices employ a thin strained InGaAs multiple quantum well active region integrated with a fully oxidised GaAs/AlxOy bottom mirror and a suspended dielectric top mirror. The devices are optically pumped via 850 nm light. These ultra-widely tunable lasers represent the first MEMS-VCSELs reported in this wavelength range, and are ideally suited for application in ophthalmic swept-source optical coherence tomography.
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Affiliation(s)
- V. Jayaraman
- Praevium Research Inc., 5266 Hollister Avenue, Suite 224, Santa Barbara, CA 93111, USA
| | - G.D. Cole
- Advanced Optical Microsystems, 1243 West El Camino Real, Mountain View, CA 94040, USA
| | - M. Robertson
- Praevium Research Inc., 5266 Hollister Avenue, Suite 224, Santa Barbara, CA 93111, USA
| | - C. Burgner
- Praevium Research Inc., 5266 Hollister Avenue, Suite 224, Santa Barbara, CA 93111, USA
| | - D. John
- Praevium Research Inc., 5266 Hollister Avenue, Suite 224, Santa Barbara, CA 93111, USA
| | - A. Uddin
- Praevium Research Inc., 5266 Hollister Avenue, Suite 224, Santa Barbara, CA 93111, USA
| | - A. Cable
- Thorlabs, 56 Sparta Ave, Newton, NJ 07860, USA
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Abstract
Plastic surgery continues to maintain a prominent presence in the evolution of male genital reconstruction. In this case report, we are presenting a case of post-electric burn with a total loss of penis. Sustaining other major injuries following an electric burn with loss of right upper limb and extensive tissue damage to left upper limb, abdomen and both thighs, this young male patient was initially managed from life-threatening problems. With many options closed following a major electric burn and its acute management, penile and urethral reconstruction was a unique and a great challenge in this patient. Heeding to the patient's wish of male pattern micturition, we had performed a successful reconstruction of urethra and entire phallus with groin flap.
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Affiliation(s)
- R Sridhar
- Department of Plastic Surgery and Burns, Kilpauk Medical College, Chennai, Tamil Nadu, India
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Jayaraman V, Cole GD, Robertson M, Uddin A, Cable A. High-sweep-rate 1310 nm MEMS-VCSEL with 150 nm continuous tuning range. Electron Lett 2012; 48:867-869. [PMID: 23976788 PMCID: PMC3749789 DOI: 10.1049/el.2012.1552] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Microelectromechanical-systems-based vertical-cavity surface-emitting lasers (MEMS-VCSELs) capable of a 150 nm continuous tuning range near 1310 nm are demonstrated. These devices employ a thin optically pumped active region structure with large free-spectral range, which promotes wide and continuous tuning. To achieve VCSEL emission at 1310 nm, a wide-gain-bandwidth indium phosphide-based multiple quantum well active region is combined with a wide-bandwidth fully oxidised GaAs-based mirror through wafer bonding, with tuning enabled by a suspended dielectric top mirror. These devices are capable of being scanned over the entire tuning range at frequencies up to 500 kHz, making them ideal for applications such as swept source optical coherence tomography and high-speed transient spectroscopy.
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Affiliation(s)
- V Jayaraman
- Praevium Research, Inc., 5266 Hollister Avenue, Suite 224, Santa Barbara, CA 93111, USA
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Ramakrishnan K, Mathivanan T, Jayaraman V, Babu M, Shankar J. Current scenario in chemical burns in a developing country: Chennai, India. Ann Burns Fire Disasters 2012; 25:8-12. [PMID: 23012609 PMCID: PMC3431731] [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] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Indexed: 06/01/2023]
Abstract
Chemical burns are not uncommon in India. Both accidental and non-accidental chemical burns are encountered in our setting. In the paediatric age group, chemical burns are mainly accidental. Analysis of chemical burn admissions to the Burn Units of a medical college hospital, and to an exclusively tertiary care children's hospital in Chennai, India, from 2001 to 2010 is described. A total number of 75 adults and 38 children are included in the study. Detailed analysis of age, sex, percentage of burn total body surface area (TBSA %), causative agents, aetiology (accidental or non-accidental), treatment instituted, mortality, and outcome are reported.
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Affiliation(s)
- K.M. Ramakrishnan
- Corresponding author: Prof. Dr K. Mathangi Ramkrishnan,
Department of Plastic Surgery & Burns, Kanchi Kamakoti CHILDS Trust Hospital12A, Nageswara RoadNungambakkam, Chennai 600034India.044 42001800 Ext 604044 28259633
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Ramakrishnan KM, Jayaraman V, Mathivanan T, Babu M, Ramachandran B, Sankar J. Profile of burn sepsis challenges and outcome in an exclusive children's hospital in Chennai, India. Ann Burns Fire Disasters 2012; 25:13-16. [PMID: 23012610 PMCID: PMC3431721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Indexed: 06/01/2023]
Abstract
A group of 273 paediatric patients admitted to Kanchi Kamakoti Childs Trust Hospital Burn Unit, Chennai, India between the years 2004 to 2010 were analysed retrospectively. Of these, 89 were suffering from sepsis and septic shock and 15 died. Strict adherence to antibiotic administration and to the Paediatric Intensive Care Unit (PICU) and management protocol improved the outcome, especially in 2009 and 2010.
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Wilkinson MN, Jayaraman V, Watkins K, Bao P, Buscaglia JM. Newly developed flexible endoscopic scissors for removal of a nasogastric tube trapped within a gastrojejunal anastomotic staple line. Endoscopy 2011; 43 Suppl 2 UCTN:E234-5. [PMID: 21773962 DOI: 10.1055/s-0030-1256426] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- M N Wilkinson
- Department of Medicine, Stony Brook University Medical Center, State University of New York at Stony Brook, Stony Brook, New York 11794, USA.
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Jayaraman V, Wilkinson MN, Nagula S, Siebel M, Bucobo JC, Zee S, Buscaglia JM. Primary jejunal angiosarcoma: an extremely rare tumor diagnosed by means of anterograde spiral enteroscopy. Endoscopy 2011; 43 Suppl 2 UCTN:E219-20. [PMID: 21590614 DOI: 10.1055/s-0030-1256397] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- V Jayaraman
- Divisions of Gastroenterology, Stony Brook University Medical Center, State University of New York at Stony Brook, Stony Brook, New York 11794, USA.
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Feeney JM, Jayaraman V, Spilka J, Shapiro DS, Ellner S, Marshall WT, Jacobs LM. Prehospital HMG Co-A reductase inhibitor use and reduced mortality in hemorrhagic shock due to trauma. Eur J Trauma Emerg Surg 2011; 38:171-6. [DOI: 10.1007/s00068-011-0144-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 07/11/2011] [Indexed: 12/12/2022]
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