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Stichele GV, Dürr A, Yoon G, Schüle R, Blackstone C, Esposito G, Buffel C, Oliveira I, Freitag C, van Rooijen S, Hoffmann S, Thielemans L, Cowling B. OTHER NMDs. Neuromuscul Disord 2021. [DOI: 10.1016/j.nmd.2021.07.379] [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: 11/27/2022]
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2
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Alemán A, Alharthi N, Amburgey K, Vajsar J, Yoon G, Bouchard M, Dowling J, Gonorazky H. MOTOR NEURON DISORDERS AND NEUROPATHIES. Neuromuscul Disord 2021. [DOI: 10.1016/j.nmd.2021.07.264] [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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3
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Qashqari H, Gonorazky H, Amburgey K, Yoon G, Hazrati L, Dowling J. CONGENITAL MYOPATHIES 2. Neuromuscul Disord 2020. [DOI: 10.1016/j.nmd.2020.08.108] [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: 10/23/2022]
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4
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Estiar M, Yu E, Ruskey J, Leveille E, Asayesh F, Spiegelman D, Trempe J, Tarnopolsky M, Suchowersky O, Dupré N, Boycott K, Yoon G, Rouleau G, Gan-Or Z. The genetic landscape of hereditary spastic paraplegia in Canada. Parkinsonism Relat Disord 2020. [DOI: 10.1016/j.parkreldis.2020.06.400] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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5
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Donkervoort S, Sabouny R, Yun P, Gauquelin L, Chao KR, Hu Y, Al Khatib I, Töpf A, Mohassel P, Cummings BB, Kaur R, Saade D, Moore SA, Waddell LB, Farrar MA, Goodrich JK, Uapinyoying P, Chan SS, Javed A, Leach ME, Karachunski P, Dalton J, Medne L, Harper A, Thompson C, Thiffault I, Specht S, Lamont RE, Saunders C, Racher H, Bernier FP, Mowat D, Witting N, Vissing J, Hanson R, Coffman KA, Hainlen M, Parboosingh JS, Carnevale A, Yoon G, Schnur RE, Boycott KM, Mah JK, Straub V, Foley AR, Innes AM, Bönnemann CG, Shutt TE. MSTO1 mutations cause mtDNA depletion, manifesting as muscular dystrophy with cerebellar involvement. Acta Neuropathol 2019; 138:1013-1031. [PMID: 31463572 PMCID: PMC6851037 DOI: 10.1007/s00401-019-02059-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 07/25/2019] [Accepted: 08/08/2019] [Indexed: 01/12/2023]
Abstract
MSTO1 encodes a cytosolic mitochondrial fusion protein, misato homolog 1 or MSTO1. While the full genotype–phenotype spectrum remains to be explored, pathogenic variants in MSTO1 have recently been reported in a small number of patients presenting with a phenotype of cerebellar ataxia, congenital muscle involvement with histologic findings ranging from myopathic to dystrophic and pigmentary retinopathy. The proposed underlying pathogenic mechanism of MSTO1-related disease is suggestive of impaired mitochondrial fusion secondary to a loss of function of MSTO1. Disorders of mitochondrial fusion and fission have been shown to also lead to mitochondrial DNA (mtDNA) depletion, linking them to the mtDNA depletion syndromes, a clinically and genetically diverse class of mitochondrial diseases characterized by a reduction of cellular mtDNA content. However, the consequences of pathogenic variants in MSTO1 on mtDNA maintenance remain poorly understood. We present extensive phenotypic and genetic data from 12 independent families, including 15 new patients harbouring a broad array of bi-allelic MSTO1 pathogenic variants, and we provide functional characterization from seven MSTO1-related disease patient fibroblasts. Bi-allelic loss-of-function variants in MSTO1 manifest clinically with a remarkably consistent phenotype of childhood-onset muscular dystrophy, corticospinal tract dysfunction and early-onset non-progressive cerebellar atrophy. MSTO1 protein was not detectable in the cultured fibroblasts of all seven patients evaluated, suggesting that pathogenic variants result in a loss of protein expression and/or affect protein stability. Consistent with impaired mitochondrial fusion, mitochondrial networks in fibroblasts were found to be fragmented. Furthermore, all fibroblasts were found to have depletion of mtDNA ranging from 30 to 70% along with alterations to mtDNA nucleoids. Our data corroborate the role of MSTO1 as a mitochondrial fusion protein and highlight a previously unrecognized link to mtDNA regulation. As impaired mitochondrial fusion is a recognized cause of mtDNA depletion syndromes, this novel link to mtDNA depletion in patient fibroblasts suggests that MSTO1-deficiency should also be considered a mtDNA depletion syndrome. Thus, we provide mechanistic insight into the disease pathogenesis associated with MSTO1 mutations and further define the clinical spectrum and the natural history of MSTO1-related disease.
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Yoon G, Estañ M, Fernandez-Nuñez E, Zak M, Esteban M, Donkervoort S, Hawkins C, Caparros-Martin J, Saade D, Hu Y, Bolduc V, Chao K, Otaify G, Temtamy S, Aglan M, Issa M, Bönnemann C, Lapunzina P, Ruiz-Perez V. NEW GENES AND DISEASES. Neuromuscul Disord 2019. [DOI: 10.1016/j.nmd.2019.06.297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Lee M, Choi H, Yoon G, Na S. Loading-device effects on the protein-unfolding mechanisms using molecular-dynamic simulations. J Mol Graph Model 2018; 81:162-167. [PMID: 29554493 DOI: 10.1016/j.jmgm.2018.03.001] [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: 12/21/2017] [Revised: 02/12/2018] [Accepted: 03/10/2018] [Indexed: 10/17/2022]
Abstract
Experimental force spectroscopy has been effectively utilized for measuring structural characterization of biomolecules and mechanical properties of biomaterials. Specifically, atomic force microscopy (AFM) has been widely used to portray biomolecular characterization in single-molecule experiment by observing the unfolding behavior of the proteins. Not only the experimental techniques enable us to characterize globular protein, but computational methods like molecular dynamics (MD) also gives insight into understanding biomolecular structures. To better comprehend the behavior of biomolecules, conditions such as pulling velocities and loading rates are put to the test, yet there are still limitations in understanding the unfolding behavior of biomolecules with the effect of different loading devices. In this study, we performed an all-atom MD and steered molecular dynamics (SMD) simulations considering different loading device effects such as "soft" and "stiff" to characterize the anisotropic unfolding behavior of ubiquitin protein. We found out the anisotropic unfolding pathways of the protein through the broken number of hydrogen bonds and geometric secondary structures of the biomolecule. Our study provides the importance for usage of various loading-devices on biomolecules when analyzing the structural compositions and the characteristics of globular biomolecules.
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Affiliation(s)
- Myeongsang Lee
- Institute of Advanced Machinery Design Technology, Korea University, 02841, Seoul, Republic of Korea
| | - Hyunsung Choi
- Department of Mechanical Engineering, Korea University, 02841, Seoul, Republic of Korea
| | - Gwonchan Yoon
- Department of Mechanical Engineering, Korea University, 02841, Seoul, Republic of Korea; Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX, 79409, USA
| | - Sungsoo Na
- Department of Mechanical Engineering, Korea University, 02841, Seoul, Republic of Korea.
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8
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Hartley T, Wagner JD, Warman-Chardon J, Tétreault M, Brady L, Baker S, Tarnopolsky M, Bourque PR, Parboosingh JS, Smith C, McInnes B, Innes AM, Bernier F, Curry CJ, Yoon G, Horvath GA, Bareke E, Gillespie M, Majewski J, Bulman DE, Dyment DA, Boycott KM. Whole-exome sequencing is a valuable diagnostic tool for inherited peripheral neuropathies: Outcomes from a cohort of 50 families. Clin Genet 2017; 93:301-309. [PMID: 28708278 DOI: 10.1111/cge.13101] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Revised: 07/04/2017] [Accepted: 07/09/2017] [Indexed: 01/02/2023]
Abstract
The inherited peripheral neuropathies (IPNs) are characterized by marked clinical and genetic heterogeneity and include relatively frequent presentations such as Charcot-Marie-Tooth disease and hereditary motor neuropathy, as well as more rare conditions where peripheral neuropathy is associated with additional features. There are over 250 genes known to cause IPN-related disorders but it is estimated that in approximately 50% of affected individuals a molecular diagnosis is not achieved. In this study, we examine the diagnostic utility of whole-exome sequencing (WES) in a cohort of 50 families with 1 or more affected individuals with a molecularly undiagnosed IPN with or without additional features. Pathogenic or likely pathogenic variants in genes known to cause IPN were identified in 24% (12/50) of the families. A further 22% (11/50) of families carried sequence variants in IPN genes in which the significance remains unclear. An additional 12% (6/50) of families had variants in novel IPN candidate genes, 3 of which have been published thus far as novel discoveries (KIF1A, TBCK, and MCM3AP). This study highlights the use of WES in the molecular diagnostic approach of highly heterogeneous disorders, such as IPNs, places it in context of other published neuropathy cohorts, while further highlighting associated benefits for discovery.
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Affiliation(s)
- T Hartley
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - J D Wagner
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - J Warman-Chardon
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada.,Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa, Canada
| | - M Tétreault
- Department of Human Genetics, McGill University, Montréal, Canada
| | - L Brady
- Department of Pediatrics, McMaster University Medical Centre, Hamilton, Canada
| | - S Baker
- Department of Medicine, McMaster University Medical Centre, Hamilton, Canada
| | - M Tarnopolsky
- Department of Pediatrics, McMaster University Medical Centre, Hamilton, Canada
| | - P R Bourque
- Department of Medicine, University of Ottawa, Ottawa, Canada
| | - J S Parboosingh
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - C Smith
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - B McInnes
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - A M Innes
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - F Bernier
- Department of Medical Genetics, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Alberta Children's Hospital Research Institute, University of Calgary, Calgary, Canada
| | - C J Curry
- Department of Pediatrics, University of California, San Francisco, California
| | - G Yoon
- Divisions of Neurology and Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - G A Horvath
- Division of Biochemical Diseases, Department of Pediatrics, B.C. Children's Hospital, University of British Columbia, Vancouver, Canada
| | - E Bareke
- Department of Human Genetics, McGill University, Montréal, Canada
| | - M Gillespie
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | | | | | - J Majewski
- Department of Human Genetics, McGill University, Montréal, Canada
| | - D E Bulman
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - D A Dyment
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada.,Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa, Canada
| | - K M Boycott
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada.,Department of Genetics, Children's Hospital of Eastern Ontario, Ottawa, Canada
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Osuna C, Apps R, Lim SY, Kublin J, Thomas R, Chen E, Yoon G, Han Huang S, Chan D, Truong R, Ren Y, Bachtel N, Ackerman M, Ananworanich J, Barouch D, Michael N, Brad Jones R, Nixon D, Whitney J. CD32 does not mark the HIV-1/SIV latent reservoir. J Virus Erad 2017. [DOI: 10.1016/s2055-6640(20)30524-0] [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: 10/23/2022] Open
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10
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Chang HJ, Lee M, Kim JI, Yoon G, Na S. Mechanical and vibrational characterization of amyloid-like HET-s nanosheets based on the skewed plate theory. Phys Chem Chem Phys 2017; 19:11492-11501. [PMID: 28425516 DOI: 10.1039/c7cp01418j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pathological amyloidogenic prion proteins have a toxic effect on functional cells in the human cerebrum because of poor degradability and the tendency to accumulate in an uncontrolled manner under physiological conditions. HET-s, a fungal prion protein, is known to undergo conformational variations from fibrillar to nanosheet structures during a change from low to high pH conditions. It has been said that this conformational change can lead to self-propagation by nucleating on the lateral surface of singlet fibrils. Efforts have been made toward the mechanical characterization of fibrillar amyloids, but a global understanding of amyloid-like HET-s nanosheet structures is lacking. In this study, we analyzed the mechanical and vibrational characteristics of the skewed HET-s nanosheet structures that developed under neutral pH conditions by performing various molecular dynamics simulations. By applying the skewed plate theory to HET-s nanosheets for various length scales with numerous pores inside the structures, we found that the skewed HET-s nanosheet structure has mechanical properties comparable to those of previously reported biological film materials and nanomaterials. Considering the inherent characteristics of structural stability, our observation provides valuable and detailed structural information on skewed amyloid-like HET-s nanosheets.
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Affiliation(s)
- Hyun Joon Chang
- Department of Mechanical Engineering, Korea University, Seoul 02841, Republic of Korea.
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11
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Zaman R, Cho CH, Hartmann-Vaccarezza K, Phan TN, Yoon G, Chong JW. Novel Fingertip Image-Based Heart Rate Detection Methods for a Smartphone. Sensors (Basel) 2017; 17:s17020358. [PMID: 28208678 PMCID: PMC5336072 DOI: 10.3390/s17020358] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 01/23/2017] [Accepted: 01/24/2017] [Indexed: 11/16/2022]
Abstract
We hypothesize that our smartphone-based fingertip image-based heart rate detection methods reliably detect the heart rhythm and rate of subjects. We propose fingertip curve line movement-based and fingertip image intensity-based detection methods, which both use the movement of successive fingertip images obtained from smartphone cameras. To investigate the performance of the proposed methods, heart rhythm and rate of the proposed methods are compared to those of the conventional method, which is based on average image pixel intensity. Using a smartphone, we collected 120 s pulsatile time series from each recruited subject. The results show that the proposed fingertip curve line movement-based method detects heart rate with a maximum deviation of 0.0832 Hz and 0.124 Hz using time- and frequency-domain based estimation, respectively, compared to the conventional method. Moreover, another proposed fingertip image intensity-based method detects heart rate with a maximum deviation of 0.125 Hz and 0.03 Hz using time- and frequency-based estimation, respectively.
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Affiliation(s)
- Rifat Zaman
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Chae Ho Cho
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Konrad Hartmann-Vaccarezza
- Instituto de Ingenieria Biológica y Médica, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile.
| | - Tra Nguyen Phan
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Gwonchan Yoon
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
| | - Jo Woon Chong
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX 79409, USA.
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12
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Suh Y, Yoon CH, Kim RK, Lim EJ, Oh YS, Hwang SG, An S, Yoon G, Gye MC, Yi JM, Kim MJ, Lee SJ. Claudin-1 induces epithelial-mesenchymal transition through activation of the c-Abl-ERK signaling pathway in human liver cells. Oncogene 2016; 36:1167-1168. [PMID: 27841864 DOI: 10.1038/onc.2016.294] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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13
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Gonorazky H, Marshall C, Hazrati L, Männikkö R, Ray P, Yoon G. Congenital myopathy with selective muscle atrophy, necklace-like fibres/central cores and craniosynostosis associated with recessive mutations in SCN4A. Neuromuscul Disord 2016. [DOI: 10.1016/j.nmd.2016.06.388] [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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14
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Al-Maawali A, Yoon G, Feigenbaum AS, Halliday WC, Clarke JTR, Branson HM, Banwell BL, Chitayat D, Blaser SI. Validation of the finding of hypertrophy of the clava in infantile neuroaxonal dystrophy/PLA2G6 by biometric analysis. Neuroradiology 2016; 58:1035-1042. [PMID: 27516098 DOI: 10.1007/s00234-016-1726-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Accepted: 07/07/2016] [Indexed: 11/29/2022]
Abstract
INTRODUCTION Infantile neuroaxonal dystrophy (INAD), an autosomal recessive neurodegenerative disorder due to PLA2G6 mutation, is classified both as a PLA2G6-associated neurodegeneration (PLAN) disorder and as one of the neurodegeneration with brain iron accumulation (NBIA) disorders. Age of onset and clinical presentation in INAD is variable. Typically described imaging features of cerebellar atrophy, cerebellar cortex bright FLAIR signal, and globus pallidus iron deposition are variable or late findings. We characterize clinical and neuroimaging phenotypes in nine children with confirmed PLA2G6 mutations and show a useful imaging feature, clava hypertrophy, which may aid in earlier identification of patients. Measurements of the clava confirm actual enlargement, rather than apparent enlargement due to volume loss of the other brain stem structures. METHODS A retrospective clinical and MRI review was performed. Brain stem measurements were performed and compared with age-matched controls. RESULTS We identified nine patients, all with novel PLA2G6 gene mutations. MRI, available in eight, showed clava hypertrophy, regardless of age or the absence of other more typically described neuroimaging findings. Brain autopsy in our cohort confirmed prominent spheroid bodies in the clava nuclei. CONCLUSION Clava hypertrophy is an important early imaging feature which may aid in indentification of children who would benefit from specific testing for PLA2G6 mutations.
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Affiliation(s)
- A Al-Maawali
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.,Department of Genetics, Sultan Qaboos University Hospital, Sultan Qaboos University, Muscat, Oman
| | - G Yoon
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.,Division of Neurology, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - A S Feigenbaum
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.,Division of Genetics, Department of Pediatrics, University of California, San Diego, La Jolla, CA, USA
| | - W C Halliday
- Division of Pathology, DPLM, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - J T R Clarke
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada
| | - H M Branson
- Division of Paediatric Neuroradiology, The Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, M5G 1X8, Ontario, Canada
| | - B L Banwell
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - D Chitayat
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, Ontario, Canada.,The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and Gynecology, Mount Sinai Hospital, University of Toronto, Toronto, Ontario, Canada
| | - Susan I Blaser
- Division of Paediatric Neuroradiology, The Hospital for Sick Children, University of Toronto, 555 University Avenue, Toronto, M5G 1X8, Ontario, Canada.
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15
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Reejhsinghani R, Brown K, Schiller N, Yoon G, Foster E, Gensler L. FRI0434 Prevalence of Structural Cardiac Disease and Diastolic Dysfunction in Axial Spondyloarthritis: A Prospective Case-Control Study. Ann Rheum Dis 2016. [DOI: 10.1136/annrheumdis-2016-eular.3245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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16
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Pope V, Dupuis L, Kannu P, Mendoza-Londono R, Sajic D, So J, Yoon G, Lara-Corrales I. Buschke-Ollendorff syndrome: a novel case series and systematic review. Br J Dermatol 2016; 174:723-9. [PMID: 26708699 DOI: 10.1111/bjd.14366] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/15/2015] [Indexed: 11/29/2022]
Abstract
Buschke-Ollendorff syndrome (BOS) is a rare, often benign, autosomal skin disorder. BOS commonly presents with nontender connective tissue naevi and sclerotic bony lesions (osteopoikilosis [OPK]). Herein, we summarize the presenting features of BOS and potential associations by conducting a systematic review of the literature and summarizing a cohort seen at the Hospital for Sick Children (HSC), Toronto, Canada. PubMed was searched using the following terms: 'BOS'; 'dermatofibrosis lenticularis'; 'OPK'; 'LEMD3'; 'elastoma'; 'collagenoma'. Only case reports were included, without date or language restrictions. Cases were further narrowed to those where patients or their families had a combination of skin and bony lesions, or a positive genetic test. Data were summarized using frequencies. In total, 594 reports were discovered, of which 546 (92%) were excluded. The remaining 48 accounted for 164 cases. Skin lesions were noted in 24% of cases and bony lesions in 20%, while 54% of patients had both. In 1% of cases the diagnosis was made on genetic testing alone. A family history was noted in 92% of cases. All patients with spinal stenosis (2%) or shortened status (7%) had OPK. Six per cent of patients had neurological problems. However, 50% of the cohort from HSC had cognitive delays, and only cases from 2007 onwards reported cognitive delays (the prevalence was 17% among those cases). This review confirms the classical diagnostic features of BOS. In addition, it highlights a previously unreported association between a shortened stature and OPK, as well as a possible association with cognitive delays.
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Affiliation(s)
- V Pope
- Department of Dermatology, Hospital for Sick Children, Toronto, ON, Canada
| | - L Dupuis
- Department of Genetics and Metabolics, Hospital for Sick Children, Toronto, ON, Canada
| | - P Kannu
- Department of Genetics and Metabolics, Hospital for Sick Children, Toronto, ON, Canada
| | - R Mendoza-Londono
- Department of Genetics and Metabolics, Hospital for Sick Children, Toronto, ON, Canada
| | - D Sajic
- Department of Dermatology, Hospital for Sick Children, Toronto, ON, Canada
| | - J So
- University Health Network and Mount Sinai Hospital, The Fred A. Litwin Family Centre in Genetic Medicine, Toronto, ON, Canada.,Centre for Addiction and Mental Health, Toronto, ON, Canada.,University of Toronto, Department of Laboratory Medicine and Pathobiology, Toronto, ON, Canada
| | - G Yoon
- Department of Genetics and Metabolics, Hospital for Sick Children, Toronto, ON, Canada
| | - I Lara-Corrales
- Pediatrics Section of Dermatology, Hospital for Sick Children, Toronto, ON, Canada.,University of Toronto, Toronto, ON, Canada
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Yoon G, Lee M, Kim K, In Kim J, Joon Chang H, Baek I, Eom K, Na S. Morphology and mechanical properties of multi-stranded amyloid fibrils probed by atomistic and coarse-grained simulations. Phys Biol 2015; 12:066021. [DOI: 10.1088/1478-3975/12/6/066021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Avila M, Dyment DA, Sagen JV, St-Onge J, Moog U, Chung BHY, Mo S, Mansour S, Albanese A, Garcia S, Martin DO, Lopez AA, Claudi T, König R, White SM, Sawyer SL, Bernstein JA, Slattery L, Jobling RK, Yoon G, Curry CJ, Merrer ML, Luyer BL, Héron D, Mathieu-Dramard M, Bitoun P, Odent S, Amiel J, Kuentz P, Thevenon J, Laville M, Reznik Y, Fagour C, Nunes ML, Delesalle D, Manouvrier S, Lascols O, Huet F, Binquet C, Faivre L, Rivière JB, Vigouroux C, Njølstad PR, Innes AM, Thauvin-Robinet C. Clinical reappraisal of SHORT syndrome with PIK3R1 mutations: toward recommendation for molecular testing and management. Clin Genet 2015; 89:501-506. [PMID: 26497935 DOI: 10.1111/cge.12688] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 10/10/2015] [Accepted: 10/16/2015] [Indexed: 12/01/2022]
Abstract
SHORT syndrome has historically been defined by its acronym: short stature (S), hyperextensibility of joints and/or inguinal hernia (H), ocular depression (O), Rieger abnormality (R) and teething delay (T). More recently several research groups have identified PIK3R1 mutations as responsible for SHORT syndrome. Knowledge of the molecular etiology of SHORT syndrome has permitted a reassessment of the clinical phenotype. The detailed phenotypes of 32 individuals with SHORT syndrome and PIK3R1 mutation, including eight newly ascertained individuals, were studied to fully define the syndrome and the indications for PIK3R1 testing. The major features described in the SHORT acronym were not universally seen and only half (52%) had four or more of the classic features. The commonly observed clinical features of SHORT syndrome seen in the cohort included intrauterine growth restriction (IUGR) <10th percentile, postnatal growth restriction, lipoatrophy and the characteristic facial gestalt. Anterior chamber defects and insulin resistance or diabetes were also observed but were not as prevalent. The less specific, or minor features of SHORT syndrome include teething delay, thin wrinkled skin, speech delay, sensorineural deafness, hyperextensibility of joints and inguinal hernia. Given the high risk of diabetes mellitus, regular monitoring of glucose metabolism is warranted. An echocardiogram, ophthalmological and hearing assessments are also recommended.
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Affiliation(s)
- M Avila
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,Service de Pédiatrie 1, Centre Hospitalier Universitaire Dijon, Dijon, France
| | - D A Dyment
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - J V Sagen
- Hormone Laboratory, Haukeland University Hospital, Bergen, Norway.,KJ Jebsen Center for Diabetes Research, Department of Clinical Science, University of Bergen, Bergen, Norway
| | - J St-Onge
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,CHU Dijon, Laboratoire de Génétique Moléculaire, Dijon, France
| | - U Moog
- Institute of Human Genetics, University of Heidelberg, Heidelberg, Germany
| | - B H Y Chung
- Department of Paediatrics and Adolescent Medicine, The University of Hong Kong - Shenzhen Hospital, Shenzhen, China
| | - S Mo
- Department of Paediatrics and Adolescent Medicine, The University of Hong Kong - Shenzhen Hospital, Shenzhen, China
| | - S Mansour
- SW Thames Regional Genetics Service, St. George's Hospital Medical School, London, SW17 0RE, UK
| | - A Albanese
- Paediatric Endocrine Unit, St George's Hospital, London, UK
| | - S Garcia
- Institute of Medical and Molecular Genetics (INGEMM), La Paz University Hospital, Madrid, Spain.,Instituto de Salud Carlos III, Unit 753, Centro de Investigacion Biomedica en Red de Enfermedades Raras (CIBERER), Madrid, Spain
| | - D O Martin
- Department of Ophthalmology, Hospital Central de la Cruz Roja San Jose y Santa Adela, Madrid, Spain
| | - A A Lopez
- Puerta de Hierro, University Hospital, Madrid, Spain
| | - T Claudi
- Department of Medicine, Bodø, Norway
| | - R König
- Department of Human Genetics, University of Frankfurt, Frankfurt, Germany
| | - S M White
- Victorian Clinical genetics Services, Murdoch Childrens Research institute, Parkville, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Australia
| | - S L Sawyer
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - J A Bernstein
- Division of Medical Genetics, Department of Pediatrics, Stanford University, Stanford, CA, USA
| | - L Slattery
- Division of Medical Genetics, Department of Pediatrics, Stanford University, Stanford, CA, USA
| | - R K Jobling
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - G Yoon
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - C J Curry
- Genetic Medicine/, University of California, San Francisco, CA, USA
| | - M L Merrer
- Département de Génétique, Hôpital Necker Enfants Malades, Paris, France
| | - B L Luyer
- Service de Pédiatrie, CH Le Havre, Le Havre, France
| | - D Héron
- Département de Génétique et Centre de Référence "Déficiences intellectuelles de causes rares", Paris, France
| | | | - P Bitoun
- Service de Pédiatrie, Bondy, France
| | - S Odent
- Service de Génétique clinique, Rennes, France.,UMR CNRS 6290 IGDR, Universitė Rennes, Rennes, France
| | - J Amiel
- Département de Génétique, Hôpital Necker Enfants Malades, Paris, France
| | - P Kuentz
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France
| | - J Thevenon
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs de l'interrégion Est, FHU-TRANSLAD, Dijon, France
| | - M Laville
- Département d'Endocrinologie, Diabétologie et Nutrition, Hospices Civils de Lyon, Centre Hospitalier Lyon-Sud, Pierre-Bénite, France.,Institut National de la Santé et de la Recherche Médicale Unité 1060, Centre Européen pour la nutrition et la Santé, Centre de Recherche en Nutrition Humaine Rhône-Alpes, Université Claude Bernard Lyon, Pierre-Bénite, France
| | - Y Reznik
- Service d'Endocrinologie, Centre Hospitalier Universitaire Côte-de-Nacre, Caen, France
| | - C Fagour
- Département d'Endocrinologie, Hôpital Haut-Lévêque, Centre Hospitalier Universitaire de Bordeaux, Pessac, France
| | - M-L Nunes
- Département d'Endocrinologie, Hôpital Haut-Lévêque, Centre Hospitalier Universitaire de Bordeaux, Pessac, France
| | - D Delesalle
- Service de pédiatrie, CH de Valencienne, Valencienne, France
| | - S Manouvrier
- Centre de Référence CLAD NdF - Service de génétique clinique Guy Fontaine, CHRU de Lille - Hôpital Jeanne de Flandre, Lille, France
| | - O Lascols
- INSERM, UMR_S938, Centre de Recherche Saint-Antoine, Paris, France.,UPMC Univ Paris 06, Paris, France.,ICAN, Institute of Cardiometabolism And Nutrition, Groupe Hospitalier Universitaire La Pitié-Salpêtrière, Paris, France.,AP-HP, Hôpital Saint-Antoine, Laboratoire Commun de Biologie et Génétique Moléculaires, Paris, France
| | - F Huet
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,Service de Pédiatrie 1, Centre Hospitalier Universitaire Dijon, Dijon, France
| | - C Binquet
- Centre d'Investigation Clinique-Epidémiologique Clinique/essais cliniques du CHU de Dijon, Dijon, France
| | - L Faivre
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs de l'interrégion Est, FHU-TRANSLAD, Dijon, France
| | - J-B Rivière
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,CHU Dijon, Laboratoire de Génétique Moléculaire, Dijon, France
| | - C Vigouroux
- INSERM, UMR_S938, Centre de Recherche Saint-Antoine, Paris, France.,UPMC Univ Paris 06, Paris, France.,ICAN, Institute of Cardiometabolism And Nutrition, Groupe Hospitalier Universitaire La Pitié-Salpêtrière, Paris, France.,AP-HP, Hôpital Saint-Antoine, Laboratoire Commun de Biologie et Génétique Moléculaires, Paris, France
| | - P R Njølstad
- Department of Pediatrics, Haukeland, University Hospital, Bergen, Norway
| | - A M Innes
- Department of Medical Genetics, University of Calgary, Calgary, Canada.,Alberta Children's Hospital Research Institute for Child and Maternal Health, University of Calgary, Calgary, Canada
| | - C Thauvin-Robinet
- EA4271 "Génétique des Anomalies du Développement" (GAD), Université de Bourgogne, Dijon, France.,Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs de l'interrégion Est, FHU-TRANSLAD, Dijon, France
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19
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Affiliation(s)
- Weiwei Tao
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA
| | - Gwonchan Yoon
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA
- Department of Mechanical Engineering, Korea University, Seoul 136-701, South Korea
| | - Penghui Cao
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA
| | - Kilho Eom
- Biomechanics Laboratory, College of Sport Science, Sungkyunkwan University, Suwon 16419, South Korea
| | - Harold S. Park
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts 02215, USA
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20
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Sawyer SL, Hartley T, Dyment DA, Beaulieu CL, Schwartzentruber J, Smith A, Bedford HM, Bernard G, Bernier FP, Brais B, Bulman DE, Warman Chardon J, Chitayat D, Deladoëy J, Fernandez BA, Frosk P, Geraghty MT, Gerull B, Gibson W, Gow RM, Graham GE, Green JS, Heon E, Horvath G, Innes AM, Jabado N, Kim RH, Koenekoop RK, Khan A, Lehmann OJ, Mendoza-Londono R, Michaud JL, Nikkel SM, Penney LS, Polychronakos C, Richer J, Rouleau GA, Samuels ME, Siu VM, Suchowersky O, Tarnopolsky MA, Yoon G, Zahir FR, Majewski J, Boycott KM. Utility of whole-exome sequencing for those near the end of the diagnostic odyssey: time to address gaps in care. Clin Genet 2015; 89:275-84. [PMID: 26283276 PMCID: PMC5053223 DOI: 10.1111/cge.12654] [Citation(s) in RCA: 270] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 08/14/2015] [Accepted: 08/14/2015] [Indexed: 12/17/2022]
Abstract
An accurate diagnosis is an integral component of patient care for children with rare genetic disease. Recent advances in sequencing, in particular whole‐exome sequencing (WES), are identifying the genetic basis of disease for 25–40% of patients. The diagnostic rate is probably influenced by when in the diagnostic process WES is used. The Finding Of Rare Disease GEnes (FORGE) Canada project was a nation‐wide effort to identify mutations for childhood‐onset disorders using WES. Most children enrolled in the FORGE project were toward the end of the diagnostic odyssey. The two primary outcomes of FORGE were novel gene discovery and the identification of mutations in genes known to cause disease. In the latter instance, WES identified mutations in known disease genes for 105 of 362 families studied (29%), thereby informing the impact of WES in the setting of the diagnostic odyssey. Our analysis of this dataset showed that these known disease genes were not identified prior to WES enrollment for two key reasons: genetic heterogeneity associated with a clinical diagnosis and atypical presentation of known, clinically recognized diseases. What is becoming increasingly clear is that WES will be paradigm altering for patients and families with rare genetic diseases.
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Affiliation(s)
- S L Sawyer
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - T Hartley
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - D A Dyment
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - C L Beaulieu
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | | | - A Smith
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - H M Bedford
- Genetics Program, North York General Hospital, Toronto, Canada
| | - G Bernard
- Departments of Pediatrics, Neurology and Neurosurgery, Division of Pediatric Neurology, Montréal Children's Hospital, Research Institute of the McGill University Health Centre, Montreal, Canada
| | - F P Bernier
- Department of Medical Genetics and Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - B Brais
- Neurogenetics of Motion Laboratory, Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Canada
| | - D E Bulman
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | | | - D Chitayat
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children and University of Toronto, Toronto, Canada.,The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and Gynecology, Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - J Deladoëy
- Department of Medicine, Centre de Recherche du CHU Ste-Justine, University of Montreal, Montreal, Canada
| | - B A Fernandez
- Disciplines of Genetics and Medicine, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Canada
| | - P Frosk
- Departments of Pediatrics and Child Health, University of Manitoba, Winnipeg, Canada
| | - M T Geraghty
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - B Gerull
- Cardiac Sciences and Medical Genetics, University of Calgary, Calgary, Canada
| | - W Gibson
- Department of Medical Genetics, University of British Columbia, Vancouver, Canada
| | - R M Gow
- Department of Pediatrics, Children's Hospital of Eastern Ontario, Ottawa, Canada
| | - G E Graham
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - J S Green
- Disciplines of Genetics and Medicine, Faculty of Medicine, Memorial University of Newfoundland, St. John's, Canada
| | - E Heon
- Department of Ophthalmology and Vision Sciences, Program of Genetics and Genomic Biology, The Hospital for Sick Children, University of Toronto, Toronto, Canada
| | - G Horvath
- Division of Biochemical Diseases, Department of Pediatrics, University of British Columbia and BC Children's Hospital, Vancouver, British Columbia, Canada
| | - A M Innes
- Department of Medical Genetics and Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - N Jabado
- Departments of Pediatrics and Human Genetics, McGill University, Montreal, Canada
| | - R H Kim
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children and University of Toronto, Toronto, Canada.,Department of Medicine, University of Toronto, Toronto, Canada
| | - R K Koenekoop
- McGill Ocular Genetics Laboratory, McGill University Health Centre, Montreal, Canada
| | - A Khan
- Department of Medical Genetics and Alberta Children's Hospital Research Institute, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - O J Lehmann
- Departments of Ophthalmology and Medical Genetics, University of Alberta, Edmonton, Canada
| | - R Mendoza-Londono
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children and University of Toronto, Toronto, Canada
| | - J L Michaud
- Department of Medicine, Centre de Recherche du CHU Ste-Justine, University of Montreal, Montreal, Canada
| | - S M Nikkel
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - L S Penney
- Medical Genetics, IWK Health Centre, Halifax, Canada
| | - C Polychronakos
- Departments of Pediatrics and Human Genetics, McGill University, Montreal, Canada
| | - J Richer
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - G A Rouleau
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Canada
| | - M E Samuels
- Department of Medicine, Centre de Recherche du CHU Ste-Justine, University of Montreal, Montreal, Canada
| | - V M Siu
- Division of Medical Genetics, Department of Pediatrics, University of Western Ontario, London, Canada
| | - O Suchowersky
- Departments of Medicine, Medical Genetics, and Pediatrics, University of Alberta, Edmonton, Canada
| | - M A Tarnopolsky
- Department of Pediatrics, McMaster University, Hamilton, Canada
| | - G Yoon
- Division of Clinical and Metabolic Genetics, The Hospital for Sick Children and University of Toronto, Toronto, Canada
| | - F R Zahir
- Department of Medical Genetics, University of British Columbia, Vancouver, Canada
| | | | | | - J Majewski
- Departments of Pediatrics and Human Genetics, McGill University, Montreal, Canada
| | - K M Boycott
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
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21
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Kim JI, Lee M, Baek I, Yoon G, Na S. The mechanical response of hIAPP nanowires based on different bending direction simulations. Phys Chem Chem Phys 2015; 16:18493-500. [PMID: 25073067 DOI: 10.1039/c4cp02494j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Amyloid proteins, implicated in numerous aging-related diseases, possess remarkable mechanical properties. Polymorphism leads to different arrangements of β sheets in amyloid fibrils, which changes the characteristics of the hydrogen bond network that determines their mechanical properties and structural characteristics. We performed bending simulations using molecular dynamics methods under constant-velocity conditions in different bending directions. Two different fibril structures, parallel/homo and parallel/hetero, of hIAPP amyloids were considered. Though the bending configuration influences the toughness of the material, our results indicate that the basic material behavior is affected by the β-sheet arrangement that is determined by the type of polymorphism in amyloid fibrils.
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Affiliation(s)
- J I Kim
- Department of Mechanical Engineering, Korea University, Seoul 136-701, Republic of Korea.
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22
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Lee Y, Heo E, Yoon A, Yoon G, Choi C, Kim T, Lee J, Kim M, Bae D, Kim B. Impact of time interval from definitive surgery to initiation of adjuvant chemotherapy (ISC) on survival for advanced epithelial ovarian cancer. Gynecol Oncol 2015. [DOI: 10.1016/j.ygyno.2015.01.098] [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: 10/23/2022]
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23
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Cao P, Yoon G, Tao W, Eom K, Park HS. The role of binding site on the mechanical unfolding mechanism of ubiquitin. Sci Rep 2015; 5:8757. [PMID: 25736913 PMCID: PMC4348633 DOI: 10.1038/srep08757] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [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: 10/12/2014] [Accepted: 02/03/2015] [Indexed: 12/16/2022] Open
Abstract
We apply novel atomistic simulations based on potential energy surface exploration to investigate the constant force-induced unfolding of ubiquitin. At the experimentally-studied force clamping level of 100 pN, we find a new unfolding mechanism starting with the detachment between β5 and β3 involving the binding site of ubiquitin, the Ile44 residue. This new unfolding pathway leads to the discovery of new intermediate configurations, which correspond to the end-to-end extensions previously seen experimentally. More importantly, it demonstrates the novel finding that the binding site of ubiquitin can be responsible not only for its biological functions, but also its unfolding dynamics. We also report in contrast to previous single molecule constant force experiments that when the clamping force becomes smaller than about 300 pN, the number of intermediate configurations increases dramatically, where almost all unfolding events at 100 pN involve an intermediate configuration. By directly calculating the life times of the intermediate configurations from the height of the barriers that were crossed on the potential energy surface, we demonstrate that these intermediate states were likely not observed experimentally due to their lifetimes typically being about two orders of magnitude smaller than the experimental temporal resolution.
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Affiliation(s)
- Penghui Cao
- Department of Mechanical Engineering, Boston University, Boston, MA 02215
| | - Gwonchan Yoon
- 1] Department of Mechanical Engineering, Boston University, Boston, MA 02215 [2] Department of Mechanical Engineering, Korea University, Seoul 136-701, South Korea
| | - Weiwei Tao
- Department of Mechanical Engineering, Boston University, Boston, MA 02215
| | - Kilho Eom
- Biomechanics Laboratory, College of Sport Science, Sungkyunkwan University, Suwon 440-746, South Korea
| | - Harold S Park
- Department of Mechanical Engineering, Boston University, Boston, MA 02215
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24
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Choi H, Chang HJ, Shin Y, Kim JI, Park HS, Yoon G, Na S. The molecular mechanism of conformational changes of the triplet prion fibrils for pH. RSC Adv 2015. [DOI: 10.1039/c5ra08015k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The HET-s prion fibril, which is found in the filamentous fungus Podospora anserina, exhibits conformational changes due to variations in pH.
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Affiliation(s)
- Hyunsung Choi
- Department of Mechanical Engineering Korea University
- Seoul 136-701
- Republic of Korea
| | - Hyun Joon Chang
- Department of Mechanical Engineering Korea University
- Seoul 136-701
- Republic of Korea
| | - Yongwoo Shin
- Department of Mechanical Engineering and Division of Materials Science and Engineering
- Boston University
- Boston
- USA
| | - Jae In Kim
- Department of Mechanical Engineering Korea University
- Seoul 136-701
- Republic of Korea
| | - Harold S. Park
- Department of Mechanical Engineering
- Boston University
- Boston
- USA
| | - Gwonchan Yoon
- Department of Mechanical Engineering Korea University
- Seoul 136-701
- Republic of Korea
- Department of Mechanical Engineering
- Boston University
| | - Sungsoo Na
- Department of Mechanical Engineering Korea University
- Seoul 136-701
- Republic of Korea
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25
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Abstract
Amyloid fibrils have recently received attention due to their remarkable mechanical properties, which are highly correlated with their biological functions. We have studied the mechanical deformation mechanisms and properties of amyloid fibrils as a function of their length scales by using atomistic simulations. It is shown that the length of amyloid fibrils plays a role in their deformation and fracture mechanisms in such a way that the competition between shear and bending deformations is highly dependent on the fibril length, and that as the fibril length increases, so does the bending strength of the fibril while its shear strength decreases. The dependence of rupture force for amyloid fibrils on their length is elucidated using the Bell model, which suggests that the rupture force of the fibril is determined from the hydrogen bond rupture mechanism that critically depends on the fibril length. We have measured the toughness of amyloid fibrils, which is shown to depend on the fibril length. In particular, the toughness of the fibril with its length of ∼3 nm is estimated to be ∼30 kcal mol(-1) nm(-3), comparable to that of a spider silk crystal with its length of ∼2 nm. Moreover, we have shown the important effect of the pulling rate on the mechanical deformation mechanisms and properties of amyloid fibril. It is found that as the pulling rate increases, so does the contribution of the shear effect to the elastic deformation of the amyloid fibril with its length of <10 nm. However, we found that the deformation mechanism of the amyloid fibril with its length of >15 nm is almost independent of the pulling rate. Our study sheds light on the role of the length scale of amyloid fibrils and the pulling rate in their mechanical behaviors and properties, which may provide insights into how the excellent mechanical properties of protein fibrils can be determined.
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Affiliation(s)
- Bumjoon Choi
- Department of Biomedical Engineering, Yonsei University, Wonju 220-710, Republic of Korea
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26
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27
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Yoon G, Malam Z, Paton T, Marshall C, Hyatt E, Ivakine Z, Kemaladewi D, Forge C, Lee K, Hawkins C, Cohn R. G.O.6. Neuromuscul Disord 2014. [DOI: 10.1016/j.nmd.2014.06.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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28
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Byun HO, Jung HJ, Kim MJ, Yoon G. PKCδ phosphorylation is an upstream event of GSK3 inactivation-mediated ROS generation in TGF-β1-induced senescence. Free Radic Res 2014; 48:1100-8. [PMID: 24917460 DOI: 10.3109/10715762.2014.929120] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Transforming growth factor β1 (TGF-β1) induces Mv1Lu cell senescence through inactivating glycogen synthase kinase 3 (GSK3), thereby inactivating complex IV and increasing intracellular ROS. In the present study, we identified protein kinase C delta (PKCδ) as an upstream regulator of GSK3 inactivation in this mechanism of TGF-β1-induced senescence. When Mv1Lu cells were exposed to TGF-β1, PKCδ phosphorylation simultaneously increased with GSK3 phosphorylation, and then AKT and ERK were phosphorylated. AKT phosphorylation and Smad signaling were independent of GSK3 phosphorylation, but ERK phosphorylation was downstream of GSK3 inactivation. TGF-β1-triggered GSK3 phosphorylation was blocked by inhibition of PKCδ, using its pharmacological inhibitor, Rottlerin, or overexpression of a dominant negative PKCδ mutant, but GSK3 inhibition with SB415286 did not alter PKCδ phosphorylation. Activation of PKCδ by PMA delayed cell growth and increased intracellular ROS level, but did not induce senescent phenotypes. In addition, overexpression of wild type or a constitutively active PKCδ mutant was enough to delay cell growth and decrease the mitochondrial oxygen consumption rate and complex IV activity, but weakly induce senescence. However, PMA treatment on Mv1Lu cells, which overexpress wild type and constitutively active PKCδ mutants, effectively induced senescence. These results indicate that PKCδ plays a key role in TGF-β1-induced senescence of Mv1Lu cells through the phosphorylation of GSK3, thereby triggering mitochondrial complex IV dysfunction and intracellular ROS generation.
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Affiliation(s)
- H-O Byun
- Department of Biochemistry & Molecular Biology, Ajou University School of Medicine , Suwon , Republic of Korea
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29
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Yoon G, Lee M, Kim JI, Na S, Eom K. Role of sequence and structural polymorphism on the mechanical properties of amyloid fibrils. PLoS One 2014; 9:e88502. [PMID: 24551113 PMCID: PMC3925137 DOI: 10.1371/journal.pone.0088502] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 01/13/2014] [Indexed: 11/25/2022] Open
Abstract
Amyloid fibrils playing a critical role in disease expression, have recently been found to exhibit the excellent mechanical properties such as elastic modulus in the order of 10 GPa, which is comparable to that of other mechanical proteins such as microtubule, actin filament, and spider silk. These remarkable mechanical properties of amyloid fibrils are correlated with their functional role in disease expression. This suggests the importance in understanding how these excellent mechanical properties are originated through self-assembly process that may depend on the amino acid sequence. However, the sequence-structure-property relationship of amyloid fibrils has not been fully understood yet. In this work, we characterize the mechanical properties of human islet amyloid polypeptide (hIAPP) fibrils with respect to their molecular structures as well as their amino acid sequence by using all-atom explicit water molecular dynamics (MD) simulation. The simulation result suggests that the remarkable bending rigidity of amyloid fibrils can be achieved through a specific self-aggregation pattern such as antiparallel stacking of β strands (peptide chain). Moreover, we have shown that a single point mutation of hIAPP chain constituting a hIAPP fibril significantly affects the thermodynamic stability of hIAPP fibril formed by parallel stacking of peptide chain, and that a single point mutation results in a significant change in the bending rigidity of hIAPP fibrils formed by antiparallel stacking of β strands. This clearly elucidates the role of amino acid sequence on not only the equilibrium conformations of amyloid fibrils but also their mechanical properties. Our study sheds light on sequence-structure-property relationships of amyloid fibrils, which suggests that the mechanical properties of amyloid fibrils are encoded in their sequence-dependent molecular architecture.
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Affiliation(s)
- Gwonchan Yoon
- Department of Mechanical Engineering, Korea University, Seoul, Republic of Korea
- Department of Mechanical Engineering, Boston University, Boston, Massachusetts, United States of America
| | - Myeongsang Lee
- Department of Mechanical Engineering, Korea University, Seoul, Republic of Korea
| | - Jae In Kim
- Department of Mechanical Engineering, Korea University, Seoul, Republic of Korea
| | - Sungsoo Na
- Department of Mechanical Engineering, Korea University, Seoul, Republic of Korea
- * E-mail: (KE); (SN)
| | - Kilho Eom
- Biomechanics Laboratory, College of Sport Science, Sungkyunkwan University, Suwon, Republic of Korea
- * E-mail: (KE); (SN)
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30
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Gensler L, Yoon G, Learch T, Ward M. SAT0273 Lower socioeconomic status and smoking are associated with greater radiographic disease severity in axial spondyloarthritis:. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.3220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Zheleznyak L, Yoon G. Investigating the roles of higher order aberrations and pupil size in accommodative lag under natural-viewing conditions. J Vis 2012. [DOI: 10.1167/12.14.57] [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: 11/24/2022] Open
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Kava M, Hawkins C, Millan LM, Banwell B, Yoon G. C.P.5 Three siblings with multi-minicore myopathy not associated with SEPN1 or RYR1 mutations. Neuromuscul Disord 2012. [DOI: 10.1016/j.nmd.2012.06.133] [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: 11/27/2022]
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Adachi Y, Poduri A, Kawaguch A, Yoon G, Salih MA, Yamashita F, Walsh CA, Barkovich AJ. Congenital microcephaly with a simplified gyral pattern: associated findings and their significance. AJNR Am J Neuroradiol 2011; 32:1123-9. [PMID: 21454410 DOI: 10.3174/ajnr.a2440] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Primary microcephaly is an incompletely understood malformation that is often associated with developmental brain anomalies, yet whether the associated anomalies result from the microcephaly itself or from associated developmental/genetic mishaps is not yet understood. This study reviewed and analyzed a large number of MR imaging scans of children with microcephaly to determine the frequency of associated morphologic findings and to assess whether these findings were associated with the severity of the microcephaly. MATERIALS AND METHODS MR images of 119 patients with clinically diagnosed microcephaly were retrospectively reviewed, focusing on the degree of microcephaly, simplification of gyri, white matter volume, abnormalities of the corpus callosum, size and structure of posterior fossa contents, and myelination. Associations among the findings were evaluated by using the Spearman correlation coefficient and the Fisher exact test. RESULTS Among 7 patients with mild, 42 with moderate, and 70 with extreme microcephaly, a significant correlation was identified between a greater degree of microcephaly and both a greater degree of simplified gyration and decreased white matter volume. The severity of the callosal anomaly showed a lower but still significant correlation with the severity of microcephaly. Degree of hypoplasia of posterior fossa structures, delay in myelination, and abnormality of the basal ganglia did not correlate with the degree of microcephaly. CONCLUSIONS A strong correlation was found between the degree of microcephaly, the volume of white matter, and the presence of a simplified gyral pattern. These associations should be considered when attempting to use neuroimaging for segregation and classification of patients with microcephaly.
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Affiliation(s)
- Y Adachi
- Department of Radiology and Biomedical Imaging, University of California, San Francisco, 94143, USA.
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Zheleznyak L, Oh JS, Sabesan R, Yoon G. Modifying monovision to improve presbyopic through-focus visual performance with a binocular adaptive optics system. J Vis 2010. [DOI: 10.1167/10.15.38] [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: 11/24/2022] Open
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38
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Yoon G, Sabesan R, Zheleznyak L, So E. Binocular visual performance after correcting higher order aberrations. J Vis 2010. [DOI: 10.1167/10.15.63] [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: 11/24/2022] Open
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Pantanelli SM, Sabesan R, Cai X, Ching S, Yoon G, Hindman HB. Effect of ocular aberration on visual acuity and contrast sensitivity after penetrating keratoplasty (PK), deep anterior lamellar keratoplasty (DALK), and Descemet's stripping automated endothelial keratoplasty (DSAEK). J Vis 2010. [DOI: 10.1167/10.15.76] [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: 11/24/2022] Open
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Yadav R, Ahmad K, Yoon G. A novel scanning system for imaging the entire anterior segment of the eye using an anterior segment OCT. J Vis 2010. [DOI: 10.1167/10.15.62] [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: 11/24/2022] Open
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Sabesan R, MacRae S, Yoon G. Role of native spherical aberration in the extended depth of focus. J Vis 2010. [DOI: 10.1167/10.15.74] [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: 11/24/2022] Open
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Eom K, Yoon G, Kim JI, Na S. Coarse-Grained Elastic Models of Protein Structures for Understanding Their Mechanics and Dynamics. ACTA ACUST UNITED AC 2010. [DOI: 10.1166/jctn.2010.1475] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sabesan R, Yoon G. Neural compensation to asymmetric optical blur to enhance visual performance in keratoconic eyes. J Vis 2010. [DOI: 10.1167/8.17.78] [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: 11/24/2022] Open
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Jeong TM, Yoon G, Cox IG. Vision improvement when correcting monochromatic higher-order aberrations with phase plates in normal and abnormal human eyes. J Vis 2010. [DOI: 10.1167/3.12.36] [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: 11/24/2022] Open
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Yoon G, Eom K, Na S. Simple micromechanical model of protein crystals for their mechanical characterizations. EPJ Web of Conferences 2010. [DOI: 10.1051/epjconf/20100605001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sohn YS, Park J, Yoon G, Song J, Jee SW, Lee JH, Na S, Kwon T, Eom K. Mechanical Properties of Silicon Nanowires. Nanoscale Res Lett 2009; 5:211-216. [PMID: 20652130 PMCID: PMC2893910 DOI: 10.1007/s11671-009-9467-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Accepted: 10/07/2009] [Indexed: 05/25/2023]
Abstract
Nanowires have been taken much attention as a nanoscale building block, which can perform the excellent mechanical function as an electromechanical device. Here, we have performed atomic force microscope (AFM)-based nanoindentation experiments of silicon nanowires in order to investigate the mechanical properties of silicon nanowires. It is shown that stiffness of nanowires is well described by Hertz theory and that elastic modulus of silicon nanowires with various diameters from ~100 to ~600 nm is close to that of bulk silicon. This implies that the elastic modulus of silicon nanowires is independent of their diameters if the diameter is larger than 100 nm. This supports that finite size effect (due to surface effect) does not play a role on elastic behavior of silicon nanowires with diameter of >100 nm.
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Affiliation(s)
- Young-Soo Sohn
- Department of Biomedical Engineering, Catholic University of Daegu, Gyeongbuk, 712-702, Republic of Korea
| | - Jinsung Park
- Department of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea
| | - Gwonchan Yoon
- Department of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea
| | - Jiseok Song
- Department of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea
| | - Sang-Won Jee
- Department of Chemical Engineering, Hanyang University, Gyeonggi-do, 426-791, Republic of Korea
| | - Jung-Ho Lee
- Department of Chemical Engineering, Hanyang University, Gyeonggi-do, 426-791, Republic of Korea
| | - Sungsoo Na
- Department of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea
| | - Taeyun Kwon
- Department of Biomedical Engineering, Yonsei University, Kangwon-do, 220-740, Republic of Korea
| | - Kilho Eom
- Department of Mechanical Engineering, Korea University, Seoul, 136-701, Republic of Korea
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Telli ML, Yoon G, Kao D, Matsuda K, Witteles RM. Left ventricular dysfunction in patients receiving cardiotoxic cancer therapies: Are clinicians responding appropriately? J Clin Oncol 2009. [DOI: 10.1200/jco.2009.27.15_suppl.9527] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
9527 Background: Cancer survivors treated with anthracyclines and/or trastuzumab are at risk for cardiotoxicity. Left ventricular (LV) systolic dysfunction (symptomatic or asymptomatic) represents a Class I indication for therapy with beta-blockers and angiotensin-converting enzyme inhibitors (ACE-I) or angiotensin receptor blockers (ARB) according to American College of Cardiology/American Heart Association heart failure guidelines. We designed this study to examine treatment practices for patients with cancer therapy-associated LV dysfunction, and the real-world adoption of treatment guidelines. Methods: After IRB approval, we identified all patients who received anthracycline and/or trastuzumab cancer therapy at Stanford University from October 1, 2005 to October 31, 2007 using an institutional pharmacy database. Out of 6,530 total cycles of chemotherapy administered, we identified all unique patients who had at least one echocardiogram performed before and after the start of chemotherapy using an institutional echocardiography database. Details of the chemotherapy regimen, cardiac risk factors, cardiac imaging results, concomitant medications, and referrals/consultations were examined for these patients. Results: A total of 88 patients met inclusion criteria. Ninety-two percent were treated with anthracyclines, 25% with trastuzumab in combination with anthracyclines, and 8% with trastuzumab alone. Mean baseline ejection fraction (EF) was 60%, with 13% of patients having a baseline EF below normal. A total of 41% had LV dysfunction (EF less than 55%) during or after cancer therapy. Of these patients, 56% received beta-blocker therapy, 47% received ACE-I or ARB therapy, and 50% were referred for cardiology consultation. Of the patients with asymptomatic LV dysfunction (75% of the LV dysfunction cohort), 41% received beta-blocker therapy, 33% received ACE-I or ARB therapy, and 37% received cardiology consultation. Conclusions: In real-world clinical practice, many cancer survivors with cardiotoxicity are not adequately evaluated and treated from a cardiovascular standpoint. Multidisciplinary collaboration between oncologists and cardiologists is needed to improve the quality of care for these patients. No significant financial relationships to disclose.
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Affiliation(s)
- M. L. Telli
- Stanford University Hospital, Stanford, CA; Stanford University, Stanford, CA; University of Colorado, Denver, CO
| | - G. Yoon
- Stanford University Hospital, Stanford, CA; Stanford University, Stanford, CA; University of Colorado, Denver, CO
| | - D. Kao
- Stanford University Hospital, Stanford, CA; Stanford University, Stanford, CA; University of Colorado, Denver, CO
| | - K. Matsuda
- Stanford University Hospital, Stanford, CA; Stanford University, Stanford, CA; University of Colorado, Denver, CO
| | - R. M. Witteles
- Stanford University Hospital, Stanford, CA; Stanford University, Stanford, CA; University of Colorado, Denver, CO
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Kim JI, Yoon G, Na S, Eom K. Hierarchical Reduction Method of Protein Structures for Understanding Protein Dynamics. Biophys J 2009. [DOI: 10.1016/j.bpj.2008.12.2058] [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] Open
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