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Schellenberg D, Gabos Z, Duimering A, Debenham BJ, Fairchild A, Huang F, Rowe L, Severin DM, Giuliani M, Bezjak A, Lok BH, Raman S, Chung P, Zhao Y, Ho C, Lock MI, Louie A, Lefresne S, Carolan H, Liu MC, Yau V, Ye AY, Olson RA, Mou B, Mohamed IG, Petrik DW, Dosani M, Pai HH, Valev B, Gaede S, Warner A, Palma DA. Stereotactic Ablative Radiotherapy for Oligo-Progressive Cancers: Results of the Randomized Phase II STOP Trial. Int J Radiat Oncol Biol Phys 2023; 117:S58. [PMID: 37784530 DOI: 10.1016/j.ijrobp.2023.06.353] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) In the metastatic setting, there is uncertain benefit to localized eradication of one or more lesions that are progressing despite systemic therapy. This randomized phase II trial examined if patients with ≤5 sites of oligoprogression benefited from the addition of stereotactic ablative radiotherapy (SABR) to standard of care (SOC) systemic therapy. MATERIALS/METHODS Eligibility criteria included age ≥18 years, ECOG performance status 0-2, and oligoprogressive disease, defined as 1-5 lesions actively progressing while on systemic therapy. Patients were required to have at least 3 months of disease stability/response on systemic therapy prior to oligoprogression. After stratifying by type of systemic therapy (cytotoxic vs. non-cytotoxic), patients were randomized 2:1 to SABR to all progressing lesions plus SOC (SABR arm) vs. SOC alone (SOC arm). The trial began exclusive to non-small cell lung cancer but did not meet accrual goals and was expanded in 2019 to include all non-hematologic malignancies. The primary endpoint was progression-free survival (PFS). Secondary endpoints included overall survival (OS), lesional control, quality of life (QOL), toxicity, and duration of current systemic agent post-SABR. RESULTS Between February 2017 and June 2021, 90 patients with 125 oligoprogressive metastases were enrolled across 8 Canadian institutions, with 59 patients randomized to SABR and 31 to SOC. Median age was 67 years (IQR: 61-73 years) and 39 (43%) were female. The most common primary sites were lung (44% of patients), genitourinary (23%) and breast (13%), with the most common oligo-progressive locations being lung (43%), bone (19%), lymph nodes (14%), and liver (13%). In the SABR arm, the most common fractionations were 35 Gy/5 (38% of lesions) and 50 Gy/5 (18%). Protocol adherence in the SOC arm was suboptimal: 3 patients (10%) withdrew immediately after randomization, and 7 additional patients (23%) received high-dose or ablative therapies. Median follow-up was 31 months. There was no difference in PFS between arms (median PFS 8.4 months in the SABR arm vs. 4.3 months in the SOC arm; however, the curves cross and 2-year PFS was 9% vs. 24% respectively, p = 0.91). Median OS was 31.2 months vs. 27.4 months, respectively (p = 0.22). Lesional control with SABR was 71% vs. 39% with SOC (p = 0.002). Median duration of post-randomization first-line systemic therapy was 10.3 months vs. 7.6 months, respectively (p = 0.71). Treatment was well-tolerated with 2 (3.4%) grade 3 treatment-related toxicities in the SABR arm and no grade 4/5 related events in either arm. QOL did not differ between arms. CONCLUSION Despite being a well-tolerated treatment providing superior lesional control, SABR for oligoprogression did not improve PFS or OS. Results may have been impacted by withdrawals and desire for ablative treatments on the SOC arm, and this lack of equipoise may make accrual to phase III trials difficult, although larger studies in select sub-populations are desired. (NCT02756793).
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Affiliation(s)
| | - Z Gabos
- University of Alberta, Edmonton, AB, Canada
| | | | | | | | - F Huang
- University of Alberta, Edmonton, AB, Canada
| | - L Rowe
- Division of Radiation Oncology, University of Alberta, Edmonton, AB, Canada
| | - D M Severin
- Division of Radiation Oncology, Cross Cancer Institute, Edmonton, AB, Canada
| | - M Giuliani
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - A Bezjak
- Princess Margaret Cancer Centre, Toronto, ON, Canada
| | - B H Lok
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - S Raman
- Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - P Chung
- Department of Radiation Oncology, Princess Margaret Cancer Centre, University of Toronto, Toronto, ON, Canada
| | - Y Zhao
- Dalhousie University, Halifax, NS, Canada
| | - C Ho
- BC Cancer - Fraser Valley, Surrey, BC, Canada
| | - M I Lock
- London Health Sciences Centre, London, ON, Canada
| | - A Louie
- Sunnybrook Odette Cancer Centre, TORONTO, ON, Canada
| | - S Lefresne
- BC Cancer Vancouver, Vancouver, BC, Canada
| | | | - M C Liu
- Department of Radiation Oncology, BC Cancer - Vancouver Centre, Vancouver, BC, Canada
| | - V Yau
- BC Cancer - Centre for the North, Prince George, BC, Canada
| | - A Y Ye
- University of British Columbia, Kelowna, BC, Canada
| | - R A Olson
- BC Cancer - Prince George, Prince George, BC, Canada
| | - B Mou
- BC Cancer - Kelowna, Kelowna, BC, Canada
| | | | | | - M Dosani
- BC Cancer - Victoria, Victoria, BC, Canada
| | - H H Pai
- BC Cancer - Victoria, Victoria, BC, Canada
| | - B Valev
- BC Cancer - Victoria, Victoria, BC, Canada
| | - S Gaede
- Department of Medical Physics, Western University, London, ON, Canada
| | - A Warner
- London Health Sciences Centre, London, ON, Canada
| | - D A Palma
- Department of Oncology, Western University, London, ON, Canada
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Patel K, Rowe L, Schott E, Zgela T, Ning H, Turkbey B, Choyke P, Lindenberg L, Pinto P, Wood B, Sowalsky A, Shih J, Salerno K, Citrin D. A Phase I Trial of Highly Conformal, Hypofractionated Post Prostatectomy Radiotherapy. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.922] [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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Patel S, Amanie J, Murtha A, Rowe L, Easaw J, Young K, Vos L, Ghosh S, Roa W. A Randomized Trial of Short-Course Versus Conventional Radiotherapy With Concomitant and Adjuvant Temozolomide in Patients 18 to 70 Years of Age With Glioblastoma. Int J Radiat Oncol Biol Phys 2021. [DOI: 10.1016/j.ijrobp.2021.07.083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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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Voss WN, Hou YJ, Johnson NV, Delidakis G, Kim JE, Javanmardi K, Horton AP, Bartzoka F, Paresi CJ, Tanno Y, Chou CW, Abbasi SA, Pickens W, George K, Boutz DR, Towers DM, McDaniel JR, Billick D, Goike J, Rowe L, Batra D, Pohl J, Lee J, Gangappa S, Sambhara S, Gadush M, Wang N, Person MD, Iverson BL, Gollihar JD, Dye JM, Herbert AS, Finkelstein IJ, Baric RS, McLellan JS, Georgiou G, Lavinder JJ, Ippolito GC. Prevalent, protective, and convergent IgG recognition of SARS-CoV-2 non-RBD spike epitopes. Science 2021; 372:1108-1112. [PMID: 33947773 PMCID: PMC8224265 DOI: 10.1126/science.abg5268] [Citation(s) in RCA: 165] [Impact Index Per Article: 55.0] [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: 01/12/2021] [Accepted: 04/29/2021] [Indexed: 12/12/2022]
Abstract
The molecular composition and binding epitopes of the immunoglobulin G (IgG) antibodies that circulate in blood plasma after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection are unknown. Proteomic deconvolution of the IgG repertoire to the spike glycoprotein in convalescent subjects revealed that the response is directed predominantly (>80%) against epitopes residing outside the receptor binding domain (RBD). In one subject, just four IgG lineages accounted for 93.5% of the response, including an amino (N)-terminal domain (NTD)-directed antibody that was protective against lethal viral challenge. Genetic, structural, and functional characterization of a multidonor class of "public" antibodies revealed an NTD epitope that is recurrently mutated among emerging SARS-CoV-2 variants of concern. These data show that "public" NTD-directed and other non-RBD plasma antibodies are prevalent and have implications for SARS-CoV-2 protection and antibody escape.
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MESH Headings
- Animals
- Antibodies, Monoclonal/blood
- Antibodies, Monoclonal/chemistry
- Antibodies, Monoclonal/immunology
- Antibodies, Neutralizing/blood
- Antibodies, Neutralizing/chemistry
- Antibodies, Neutralizing/immunology
- Antibodies, Viral/blood
- Antibodies, Viral/chemistry
- Antibodies, Viral/immunology
- Antibody Affinity
- COVID-19/immunology
- COVID-19/prevention & control
- Epitopes/immunology
- Humans
- Immune Evasion
- Immunoglobulin G/blood
- Immunoglobulin G/chemistry
- Immunoglobulin G/immunology
- Immunoglobulin Heavy Chains/immunology
- Immunoglobulin Variable Region/immunology
- Mice
- Mice, Inbred BALB C
- Mutation
- Protein Domains
- Proteomics
- SARS-CoV-2/genetics
- SARS-CoV-2/immunology
- Spike Glycoprotein, Coronavirus/chemistry
- Spike Glycoprotein, Coronavirus/genetics
- Spike Glycoprotein, Coronavirus/immunology
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Affiliation(s)
- William N Voss
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Yixuan J Hou
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Nicole V Johnson
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - George Delidakis
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, USA
| | - Jin Eyun Kim
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX, USA
| | - Kamyab Javanmardi
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Andrew P Horton
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Foteini Bartzoka
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Chelsea J Paresi
- Department of Chemistry, The University of Texas at Austin, Austin, TX, USA
| | - Yuri Tanno
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, USA
| | - Chia-Wei Chou
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Shawn A Abbasi
- U.S. Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
| | - Whitney Pickens
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Katia George
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Daniel R Boutz
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
- CCDC Army Research Laboratory-South, The University of Texas at Austin, Austin, TX, USA
| | - Dalton M Towers
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, USA
| | | | - Daniel Billick
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Jule Goike
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Lori Rowe
- Biotechnology Core Facility Branch, Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
- Tulane National Primate Research Center Department of Microbiology 18703 Three Rivers Road Covington, LA, USA
| | - Dhwani Batra
- Biotechnology Core Facility Branch, Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Jan Pohl
- Biotechnology Core Facility Branch, Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Justin Lee
- Biotechnology Core Facility Branch, Division of Scientific Resources, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Shivaprakash Gangappa
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Suryaprakash Sambhara
- Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Michelle Gadush
- Center for Biomedical Research Support, The University of Texas at Austin, Austin, TX, USA
| | - Nianshuang Wang
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Maria D Person
- Center for Biomedical Research Support, The University of Texas at Austin, Austin, TX, USA
| | - Brent L Iverson
- Department of Chemistry, The University of Texas at Austin, Austin, TX, USA
| | - Jimmy D Gollihar
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
- CCDC Army Research Laboratory-South, The University of Texas at Austin, Austin, TX, USA
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, TX, USA
| | - John M Dye
- U.S. Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
| | - Andrew S Herbert
- U.S. Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
| | - Ilya J Finkelstein
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - Ralph S Baric
- Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Jason S McLellan
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
| | - George Georgiou
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, USA
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX, USA
- Department of Oncology, Dell Medical School, The University of Texas at Austin, Austin, TX, USA
| | - Jason J Lavinder
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA.
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX, USA
| | - Gregory C Ippolito
- Department of Molecular Biosciences, The University of Texas at Austin, Austin, TX, USA.
- Department of Pathology and Genomic Medicine, Houston Methodist Research Institute, Houston Methodist Hospital, Houston, TX, USA
- Department of Oncology, Dell Medical School, The University of Texas at Austin, Austin, TX, USA
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Voss WN, Hou YJ, Johnson NV, Kim JE, Delidakis G, Horton AP, Bartzoka F, Paresi CJ, Tanno Y, Abbasi SA, Pickens W, George K, Boutz DR, Towers DM, McDaniel JR, Billick D, Goike J, Rowe L, Batra D, Pohl J, Lee J, Gangappa S, Sambhara S, Gadush M, Wang N, Person MD, Iverson BL, Gollihar JD, Dye J, Herbert A, Baric RS, McLellan JS, Georgiou G, Lavinder JJ, Ippolito GC. Prevalent, protective, and convergent IgG recognition of SARS-CoV-2 non-RBD spike epitopes in COVID-19 convalescent plasma. bioRxiv 2020. [PMID: 33398269 DOI: 10.1101/2020.12.20.423708] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Although humoral immunity is essential for control of SARS-CoV-2, the molecular composition, binding epitopes and effector functions of the immunoglobulin G (IgG) antibodies that circulate in blood plasma following infection are unknown. Proteomic deconvolution of the circulating IgG repertoire (Ig-Seq 1 ) to the spike ectodomain (S-ECD 2 ) in four convalescent study subjects revealed that the plasma response is oligoclonal and directed predominantly (>80%) to S-ECD epitopes that lie outside the receptor binding domain (RBD). When comparing antibodies directed to either the RBD, the N-terminal domain (NTD) or the S2 subunit (S2) in one subject, just four IgG lineages (1 anti-S2, 2 anti-NTD and 1 anti-RBD) accounted for 93.5% of the repertoire. Although the anti-RBD and one of the anti-NTD antibodies were equally potently neutralizing in vitro , we nonetheless found that the anti-NTD antibody was sufficient for protection to lethal viral challenge, either alone or in combination as a cocktail where it dominated the effect of the other plasma antibodies. We identified in vivo protective plasma anti-NTD antibodies in 3/4 subjects analyzed and discovered a shared class of antibodies targeting the NTD that utilize unmutated or near-germline IGHV1-24, the most electronegative IGHV gene in the human genome. Structural analysis revealed that binding to NTD is dominated by interactions with the heavy chain, accounting for 89% of the entire interfacial area, with germline residues uniquely encoded by IGHV1-24 contributing 20% (149 Å 2 ). Together with recent reports of germline IGHV1-24 antibodies isolated by B-cell cloning 3,4 our data reveal a class of shared IgG antibodies that are readily observed in convalescent plasma and underscore the role of NTD-directed antibodies in protection against SARS-CoV-2 infection.
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Sanghera K, Kim J, Ghosh S, McDonald M, Ong A, Koul R, Dubey A, Ahmed S, Quon H, Yee D, Sivananthan G, Danielson B, Rowe L, Rose J, Hunter W, Usmani N. Interim Analysis of a Phase II Multi-institution Randomized Placebo-controlled Trial the PREMIUM trial (PREvention of Metabolic Syndrome and Increased weight Using Metformin concurrent to ADT and EBRT for locally advanced adenocarcinoma of the prostate). Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.2104] [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: 11/16/2022]
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Reilly JR, Artz DR, Biddinger D, Bobiwash K, Boyle NK, Brittain C, Brokaw J, Campbell JW, Daniels J, Elle E, Ellis JD, Fleischer SJ, Gibbs J, Gillespie RL, Gundersen KB, Gut L, Hoffman G, Joshi N, Lundin O, Mason K, McGrady CM, Peterson SS, Pitts-Singer TL, Rao S, Rothwell N, Rowe L, Ward KL, Williams NM, Wilson JK, Isaacs R, Winfree R. Crop production in the USA is frequently limited by a lack of pollinators. Proc Biol Sci 2020; 287:20200922. [PMID: 33043867 PMCID: PMC7423660 DOI: 10.1098/rspb.2020.0922] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 07/07/2020] [Indexed: 11/12/2022] Open
Abstract
Most of the world's crops depend on pollinators, so declines in both managed and wild bees raise concerns about food security. However, the degree to which insect pollination is actually limiting current crop production is poorly understood, as is the role of wild species (as opposed to managed honeybees) in pollinating crops, particularly in intensive production areas. We established a nationwide study to assess the extent of pollinator limitation in seven crops at 131 locations situated across major crop-producing areas of the USA. We found that five out of seven crops showed evidence of pollinator limitation. Wild bees and honeybees provided comparable amounts of pollination for most crops, even in agriculturally intensive regions. We estimated the nationwide annual production value of wild pollinators to the seven crops we studied at over $1.5 billion; the value of wild bee pollination of all pollinator-dependent crops would be much greater. Our findings show that pollinator declines could translate directly into decreased yields or production for most of the crops studied, and that wild species contribute substantially to pollination of most study crops in major crop-producing regions.
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Affiliation(s)
- J. R. Reilly
- Department of Ecology, Evolution and Natural Resources, Rutgers University, New Brunswick, NJ 08901, USA
| | - D. R. Artz
- USDA-Agricultural Research Service, Pollinating Insects Research Unit, Logan, UT 84322, USA
| | - D. Biddinger
- Department of Entomology, Pennsylvania State University Fruit Research and Extension Center, Biglerville, PA 17307, USA
| | - K. Bobiwash
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC, V5A1S6Canada
- Department of Entomology, University of Manitoba, Winnipeg, MB R3T 2N2Canada
| | - N. K. Boyle
- USDA-Agricultural Research Service, Pollinating Insects Research Unit, Logan, UT 84322, USA
- Department of Entomology, Pennsylvania State University, University Park, PA 16802, USA
| | - C. Brittain
- Department of Entomology and Nematology, University of California Davis, Davis, CA 95616, USA
| | - J. Brokaw
- Department of Entomology, University of Minnesota, St. Paul, MN 55113, USA
| | - J. W. Campbell
- Department of Entomology and Nematology, University of Florida, Gainesville, FL 32611, USA
- USDA Agricultural Research Service, Northern Plains Agricultural Research Laboratory, Sidney, MT 59270, USA
| | - J. Daniels
- Department of Entomology and Nematology, University of Florida, Gainesville, FL 32611, USA
- Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA
| | - E. Elle
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC, V5A1S6Canada
| | - J. D. Ellis
- Department of Entomology and Nematology, University of Florida, Gainesville, FL 32611, USA
| | - S. J. Fleischer
- Department of Entomology, Pennsylvania State University, University Park, PA 16802, USA
| | - J. Gibbs
- Department of Entomology, University of Manitoba, Winnipeg, MB R3T 2N2Canada
| | - R. L. Gillespie
- Agriculture and Natural Resource Program, Wenatchee Valley College, Wenatchee, WA 98801, USA
| | - K. B. Gundersen
- Department of Entomology, Michigan State University, East Lansing, MI 48824, USA
| | - L. Gut
- Department of Entomology, Michigan State University, East Lansing, MI 48824, USA
| | - G. Hoffman
- Department of Crop and Soil Science, Oregon State University, Corvallis, OR 97331, USA
| | - N. Joshi
- Department of Entomology and Plant Pathology, University of Arkansas, Fayetteville, AR 72701, USA
| | - O. Lundin
- Department of Ecology, Swedish University of Agricultural Sciences, SE-75007 Uppsala, Sweden
| | - K. Mason
- Department of Entomology, Michigan State University, East Lansing, MI 48824, USA
| | - C. M. McGrady
- Department of Applied Ecology, North Carolina State University, Raleigh, NC 27695, USA
| | | | - T. L. Pitts-Singer
- USDA-Agricultural Research Service, Pollinating Insects Research Unit, Logan, UT 84322, USA
| | - S. Rao
- Department of Entomology, University of Minnesota, St. Paul, MN 55113, USA
| | - N. Rothwell
- Northwest Michigan Horticultural Research Center, Michigan State University, Traverse City, MI 49684, USA
| | - L. Rowe
- Department of Entomology, Michigan State University, East Lansing, MI 48824, USA
| | - K. L. Ward
- Department of Entomology and Nematology, University of California Davis, Davis, CA 95616, USA
- National Park Service, Yosemite National Park, CA 95389, USA
| | - N. M. Williams
- Department of Entomology and Nematology, University of California Davis, Davis, CA 95616, USA
| | - J. K. Wilson
- Department of Entomology, Michigan State University, East Lansing, MI 48824, USA
| | - R. Isaacs
- Department of Entomology, Michigan State University, East Lansing, MI 48824, USA
| | - R. Winfree
- Department of Ecology, Evolution and Natural Resources, Rutgers University, New Brunswick, NJ 08901, USA
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Boughey P, Jones C, Williams V, Rowe L, Marchant A, Lacey E, Evans B, Morcam C, Webb N, Davies R, Smith E, Shankland H, Leopold N, Harris W, Hudson C, Edwards R. Integrated care of older people (iCOP): an service delivering comprehensive geriatric assessment on the acute assessment unit at Singleton Hospital. Physiotherapy 2020. [DOI: 10.1016/j.physio.2020.03.249] [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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Krauze AV, Megan M, Theresa CZ, Peter M, Shih JH, Tofilon PJ, Rowe L, Gilbert M, Camphausen K. The addition of Valproic acid to concurrent radiation therapy and temozolomide improves patient outcome: a Correlative analysis of RTOG 0525, SEER and a Phase II NCI trial. Cancer Stud Ther 2020; 5. [PMID: 34621499 PMCID: PMC8494241 DOI: 10.31038/cst.2020511] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
PURPOSE/OBJECTIVES Valproic Acid (VPA) is an antiepileptic agent with HDACi (histone deacetylase inhibitor) activity shown to radiosensitize glioblastoma (GBM) cells. We evaluated the addition of VPA to standard radiation therapy (RT) and temozolomide (TMZ) in an open-label, phase II study (NCI-06-C-0112). The intent of the current study was to compare our patient outcomes with modern era standard of care data (RTOG 0525) and general population data (SEER 2006-2013). MATERIALS/METHODS 37 patients with newly diagnosed GBM were treated in a phase II NCI trial with daily VPA (25 mg/kg) in addition to concurrent RT and TMZ (2006 - 2013) and 411 patients with newly diagnosed GBM were treated in the standard TMZ dose arm of RTOG 0525 (2006 - 2008). Using the SEER database, adult patients (age > 15) with diagnostic codes 9440-9443 (third edition (IDC-O-3) diagnosed between 2006 - 2013 were identified and 6083 were included in the analysis. Kaplan-Meier method was used to estimate OS and PFS. The effect of patient characteristics and clinical factors on OS and PFS was analyzed using univariate analysis and a Cox regression model. A landmark analysis was performed to correlate recurrence to OS and conditional probabilities of surviving an additional 12 months at diagnosis, 6, 12, 18, 24 and 30 months were calculated for both the trial data and the SEER data. RESULTS Updated median OS in the NCI cohort was 30.9m (22.2- 65.6m), compared to RTOG 0525 18.9m (16.8-20.3m) (p= 0.007) and the SEER cohort of 11m. Median PFS in the NCI cohort was 11.1m (6.6 - 49.6m) compared to RTOG 0525 with a median PFS of 7.5m (6.9-8.2m) (p = 0.004). Younger age, class V RPA and MGMT status were significant for PFS in both the NCI cohort and the RTOG 0525 cohort, in addition KPS was also significant for OS. In comparison to RTOG 0525, the population in the NCI cohort had a more favorable KPS and RPA, and a higher proportion of patients receiving bevacizumab after protocol therapy however with the exception of RPA (V) (8% vs 18%) (0.026), the effects of these factors on PFS and OS were not significantly different between the two cohorts. CONCLUSION Previously reported improvements in PFS and OS with the addition of VPA to concurrent RT and TMZ in the NCI phase II study were confirmed by comparison to both a trial population receiving standard of care (RTOG 0525) and a contemporary SEER cohort. These results provide further justification of a phase III trial of VPA/RT/TMZ.
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Affiliation(s)
- A V Krauze
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - Mackey Megan
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - Cooley-Zgela Theresa
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - Mathen Peter
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - J H Shih
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - P J Tofilon
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - L Rowe
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - M Gilbert
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
| | - K Camphausen
- Radiation Oncology Branch, Center for Cancer Research, National Cancer Institute, NIH, 9000 Rockville Pike, Building 10, CRC, Bethesda, MD 20892, USA
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Salerno K, Graff A, Silver T, Schott E, Shankavaram U, Cooley-Zgela T, Rowe L, Citrin D. Bone Mineral Density Changes in Patients with Prostate Cancer Treated with Androgen Deprivation Therapy and External Beam Radiation Therapy: Hip and Spine Comparison. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1903] [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: 10/26/2022]
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Sowalsky A, Turkbey B, Trostel S, Shankavaram U, Carrabba N, Sater H, Lake R, Rowe L, Cooley-Zgela T, Schott E, Zhang H, Pinto P, Wood B, Liu S, Davicioni E, Choyke P, Citrin D. Integrated Radiogenomic Subtyping and Treatment Response of Intermediate and High Risk Prostate Cancer. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.537] [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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Mandia J, Ning H, Salerno K, Escorcia F, Citrin D, Rowe L. Image Guidance in Radiation Therapy for Prostate Cancer: Results of Patterns of Practice Survey. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1837] [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: 10/26/2022]
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Mandia J, Ning H, Salerno K, Escorcia F, Citrin D, Rowe L. Bowel and Bladder Reproducibility in Radiation Therapy for Prostate Cancer: Results of Patterns of Practice Survey. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.1836] [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: 10/26/2022]
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Scaife J, Boughey P, Jones C, Williams V, Rowe L, Marchant A, Lacey E, Rees O, Morcam C, Webb N, Davies R, Smith E, Leopold N, Harris W, Hudson C, Edwards R. 20INTEGRATED CARE OF OLDER PEOPLE (ICOP): A NEW SERVICE DELIVERING COMPREHENSIVE GERIATRIC ASSESSMENT (CGA) ON THE ACUTE ASSESSMENT UNIT AT SINGLETON HOSPITAL: RESULTS OF 2 PDSA CYCLES. Age Ageing 2019. [DOI: 10.1093/ageing/afz055.20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J Scaife
- Department of Medicine for Older People, Singleton Hospital
| | - P Boughey
- Department of Medicine for Older People, Singleton Hospital
| | - C Jones
- Department of Medicine for Older People, Singleton Hospital
| | - V Williams
- Department of Medicine for Older People, Singleton Hospital
| | - L Rowe
- Department of Medicine for Older People, Singleton Hospital
| | - A Marchant
- Department of Medicine for Older People, Singleton Hospital
| | - E Lacey
- Department of Medicine for Older People, Singleton Hospital
| | - O Rees
- Department of Medicine for Older People, Singleton Hospital
| | - C Morcam
- Department of Medicine for Older People, Singleton Hospital
| | - N Webb
- Department of Medicine for Older People, Singleton Hospital
| | - R Davies
- Department of Medicine for Older People, Singleton Hospital
| | - E Smith
- Department of Medicine for Older People, Singleton Hospital
| | - N Leopold
- Department of Medicine for Older People, Singleton Hospital
| | - W Harris
- Department of Medicine for Older People, Singleton Hospital
| | - C Hudson
- Department of Medicine for Older People, Singleton Hospital
| | - R Edwards
- Department of Medicine for Older People, Singleton Hospital
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Jordan N, Das S, Maywald A, King G, Rowe L, Vincent R, Koufariotis V, McElhinney J, Zentner D, Burchill L. How do We Extend the Reach of Cardiac Coaching to Those That Need It Most? – Factors Affecting Recruitment into the HARP Cardiac Coaching Programme at RMH. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.542] [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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16
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Searcy C, Gilbert B, Krkošek M, Rowe L, McCauley S. Positive correlation between dispersal and body size in Green Frogs (Rana clamitans) naturally colonizing an experimental landscape. CAN J ZOOL 2018. [DOI: 10.1139/cjz-2018-0069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dispersers are often assumed to have the mean phenotype observed across the entire metapopulation, despite growing evidence of dispersal–phenotype correlations. We examined three dispersal–phenotype correlations in Green Frogs (Rana clamitans Latreille, 1801 = Lithobates clamitans (Latreille, 1801)). Two were in traits that have been previously tied to fitness (body size and body condition), while a third (relative hindlimb length) has been linked to movement performance. We constructed a spatially dispersed array of experimental ponds in close proximity to source ponds known to support Green Frog breeding populations. Over the course of two breeding seasons (four sampling periods), we measured phenotypes of all Green Frogs that had colonized the experimental ponds and a sample of individuals from the source ponds. After only 1 month, a positive correlation was detected between dispersal and body size within the population of dispersers occupying the experimental ponds. After a 2nd month, this positive dispersal – body size correlation was also present when comparing the population of dispersers to the population of nondispersers remaining at the source ponds. Even if generated solely by plasticity, a positive correlation between dispersal and body size (a trait tightly linked to fitness) has the ability to alter metapopulation capacity and thus the probability of regional species persistence.
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Affiliation(s)
- C.A. Searcy
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON L5L 1C6, Canada
| | - B. Gilbert
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
| | - M. Krkošek
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
| | - L. Rowe
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
| | - S.J. McCauley
- Department of Biology, University of Toronto Mississauga, 3359 Mississauga Road, Mississauga, ON L5L 1C6, Canada
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17
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Horn A, Smith C, Harmon S, Ning H, Pomper M, Schott E, Cooley-Zgela T, Choyke P, Mena Gonzalez E, Turkbey B, Citrin D, Lindenberg L, Rowe L. Evaluating Patterns of Prostate Cancer Recurrence on 18F-DCFBC PET/CT Imaging in Relationship to RTOG Consensus Post-prostatectomy and Pelvic Lymph Node Treatment Volumes. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.319] [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: 10/28/2022]
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18
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Smith C, Chaurasia A, Harmon S, Rowe L, Greer M, Valle L, Choyke P, Citrin D, Turkbey B. Associations between MRI Findings and Urinary Tract Symptoms after IMRT for Prostate Cancer. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.07.274] [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: 10/28/2022]
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19
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Valle L, Rowe L, Krauze A, Kaushal A, Arora B, Ning H, Cooley-Zgela T, Schott E, Choyke P, Turkbey B, Citrin D. The Response of Male Erectile Tissues to Androgen Deprivation Therapy and Radiation. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1246] [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: 11/16/2022]
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20
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Krauze A, Myrehaug S, Chang M, Holdford D, Smith S, Shih J, Tofilon P, Fine H, Rowe L, Gilbert M, Camphausen K. Does the Addition of Valproic Acid to Concurrent Radiation Therapy and Temozolomide Improve Patient Outcome? Correlative Analysis of RTOG 0525, SEER, and a Phase 2 NCI Trial. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.240] [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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21
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Horn A, Shankavaram U, Madan R, Pinto P, Kaushal A, Krauze A, Rowe L, Schott E, Cooley-Zgela T, Choyke P, Turkbey B, Citrin D. Pretreatment Predictors of Rapid Prostate Lesion Response to Radiation Therapy Measured by Multiparametric MRI. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.1177] [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: 10/18/2022]
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22
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Rowe L, Butman J, Mackey M, Shih J, Ning H, Cooley-Zgela T, Gilbert M, Smart D, Camphausen K, Krauze A. Response Assessment in Glioblastoma: A Clinical Experience. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.466] [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: 10/18/2022]
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23
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Elkeeb D, Rowe L, Kohan J, Yu W, Ho G, Salama M, Wada D. LB972 Characterization of collagen in normal and diseased skin using second harmonic generation and two photon excitation microscopy. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.050] [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: 11/16/2022]
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24
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Krauze A, Cheng J, Ning H, Hawes M, Mackey M, Zgela TC, Smart D, Citrin D, Rowe L, Camphausen K. Deformable Registration for Estimation of Cumulative Dose and Normal Tissue Complication Probability in Patients Receiving Reirradiation for Recurrent High-Grade Glioma. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.905] [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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25
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Rowe L, Mackey M, Smart D, Ning H, Gilbert M, Camphausen K, Krauze A. Outcomes and Prognostic Features of Glioblastoma Multiforme in the Temozolomide Era. Int J Radiat Oncol Biol Phys 2016. [DOI: 10.1016/j.ijrobp.2016.06.843] [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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26
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Olivotto IA, Soo J, Olson RA, Rowe L, French J, Jensen B, Pastuch A, Halperin R, Truong PT. Patient preferences for timing and access to radiation therapy. ACTA ACUST UNITED AC 2015; 22:279-86. [PMID: 26300666 DOI: 10.3747/co.22.2532] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE Patient preferences for radiation therapy (rt) access were investigated. METHODS Patients completing a course of rt at 6 centres received a 17-item survey that rated preferences for time of day; day of week; actual, ideal, and reasonable travel times for rt; and actual, ideal, and reasonable times between referral and first oncologic consultation. Patients receiving single-fraction rt or brachytherapy alone were excluded. RESULTS Of the respondents who returned surveys (n = 1053), 54% were women, and 74% had received more than 15 rt fractions. With respect to appointment times, 88% agreed or strongly agreed that rt between 08h00 and 16h30 was preferred; 14%-15% preferred 07h30-08h00 or 16h30-17h00; 10% preferred 17h00-18h00; and 6% or fewer preferred times before 07h30 or after 18h00. A preference not to receive rt before 07h30 or after 18h00 was expressed by 30% or more of the respondents. When days of the week were considered, 18% and 11% would have preferred to receive rt on a Saturday or Sunday respectively; 52% and 55% would have preferred not to receive rt on those days. A travel time of 1 hour or less for rt was reported by 82%, but 61% felt that a travel time of 1 hour or more was reasonable. A first consultation within 2 weeks of referral was felt to be ideal or reasonable by 88% and 73% of patients respectively. CONCLUSIONS An rt service designed to meet patient preferences would make most capacity available between 08h00 and 16h30 on weekdays and provide 10%-20% of rt capacity on weekends and during 07h30-08h00 and 16h30-18h00 on weekdays. Approximately 80%, but not all, of the responding patients preferred a 2-week or shorter interval between referral and first oncologic consultation.
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Affiliation(s)
- I A Olivotto
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC; ; University of British Columbia, Division of Radiation Oncology and Developmental Radiotherapeutics, Vancouver, Prince George, Kelowna, and Victoria, BC; ; University of Calgary, Calgary, AB
| | - J Soo
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC
| | - R A Olson
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC; ; University of British Columbia, Division of Radiation Oncology and Developmental Radiotherapeutics, Vancouver, Prince George, Kelowna, and Victoria, BC
| | - L Rowe
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC
| | - J French
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC
| | - B Jensen
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC
| | - A Pastuch
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC
| | - R Halperin
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC; ; University of British Columbia, Division of Radiation Oncology and Developmental Radiotherapeutics, Vancouver, Prince George, Kelowna, and Victoria, BC
| | - P T Truong
- BC Cancer Agency, Radiation Therapy Program, Vancouver, Prince George, Surrey, Victoria, Abbotsford, and Kelowna, BC; ; University of British Columbia, Division of Radiation Oncology and Developmental Radiotherapeutics, Vancouver, Prince George, Kelowna, and Victoria, BC
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Kawchuk G, Fryer J, Jaremko J, Zeng H, Rowe L, Thompson R. Visualization of joint cavitation in realtime. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.3595] [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: 12/01/2022]
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Wolff BJ, Morrison SS, Pesti D, Ganakammal SR, Srinivasamoorthy G, Changayil S, Weil MR, MacCannell D, Rowe L, Frace M, Ritchie BW, Dean D, Winchell JM. Chlamydia psittaci comparative genomics reveals intraspecies variations in the putative outer membrane and type III secretion system genes. Microbiology (Reading) 2015; 161:1378-91. [PMID: 25887617 PMCID: PMC4635502 DOI: 10.1099/mic.0.000097] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Chlamydia psittaci is an obligate intracellular bacterium that can cause significant disease among a broad range of hosts. In humans, this organism may cause psittacosis, a respiratory disease that can spread to involve multiple organs, and in rare untreated cases may be fatal. There are ten known genotypes based on sequencing the major outer-membrane protein gene, ompA, of C. psittaci. Each genotype has overlapping host preferences and virulence characteristics. Recent studies have compared C. psittaci among other members of the Chlamydiaceae family and showed that this species frequently switches hosts and has undergone multiple genomic rearrangements. In this study, we sequenced five genomes of C. psittaci strains representing four genotypes, A, B, D and E. Due to the known association of the type III secretion system (T3SS) and polymorphic outer-membrane proteins (Pmps) with host tropism and virulence potential, we performed a comparative analysis of these elements among these five strains along with a representative genome from each of the remaining six genotypes previously sequenced. We found significant genetic variation in the Pmps and tbl3SS genes that may partially explain differences noted in C. psittaci host infection and disease.
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Affiliation(s)
- Bernard J Wolff
- 1Infectious Diseases Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA, USA 2Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Shatavia S Morrison
- 2Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Denise Pesti
- 1Infectious Diseases Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Satishkumar Ranganathan Ganakammal
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Ganesh Srinivasamoorthy
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Shankar Changayil
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - M Ryan Weil
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Duncan MacCannell
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Lori Rowe
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Michael Frace
- 3The National Center for Emerging and Zoonotic Infectious Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Branson W Ritchie
- 1Infectious Diseases Laboratory, College of Veterinary Medicine, University of Georgia, Athens, GA, USA
| | - Deborah Dean
- 4Children's Hospital Oakland Research Institute, Oakland, CA 5UCSF and UC Berkeley Joint Graduate Program in Bioengineering, Oakland, CA
| | - Jonas M Winchell
- 2Respiratory Diseases Branch, Centers for Disease Control and Prevention, Atlanta, GA, USA
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Wilkinson GS, Breden F, Mank JE, Ritchie MG, Higginson AD, Radwan J, Jaquiery J, Salzburger W, Arriero E, Barribeau SM, Phillips PC, Renn SCP, Rowe L. The locus of sexual selection: moving sexual selection studies into the post-genomics era. J Evol Biol 2015; 28:739-55. [PMID: 25789690 DOI: 10.1111/jeb.12621] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 03/04/2015] [Accepted: 03/06/2015] [Indexed: 02/07/2023]
Abstract
Sexual selection drives fundamental evolutionary processes such as trait elaboration and speciation. Despite this importance, there are surprisingly few examples of genes unequivocally responsible for variation in sexually selected phenotypes. This lack of information inhibits our ability to predict phenotypic change due to universal behaviours, such as fighting over mates and mate choice. Here, we discuss reasons for this apparent gap and provide recommendations for how it can be overcome by adopting contemporary genomic methods, exploiting underutilized taxa that may be ideal for detecting the effects of sexual selection and adopting appropriate experimental paradigms. Identifying genes that determine variation in sexually selected traits has the potential to improve theoretical models and reveal whether the genetic changes underlying phenotypic novelty utilize common or unique molecular mechanisms. Such a genomic approach to sexual selection will help answer questions in the evolution of sexually selected phenotypes that were first asked by Darwin and can furthermore serve as a model for the application of genomics in all areas of evolutionary biology.
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Affiliation(s)
- G S Wilkinson
- Department of Biology, University of Maryland, College Park, MD, USA
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Rowe L, Krauze A, Hanson J, Yee D. Dosimetry and Survival From an Adaptive Radiation Therapy Clinical Trial for Limited-Stage Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.08.292] [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: 10/24/2022]
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Rowe L, Krauze A, Hanson J, Yee D. Dosimetry and Survival From an Adaptive Radiation Therapy Clinical Trial for Limited-Stage Small Cell Lung Cancer. Int J Radiat Oncol Biol Phys 2014. [DOI: 10.1016/j.ijrobp.2014.05.1902] [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: 10/24/2022]
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34
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Teboh FR, Agee M, Rowe L, Creasy T, Schultz J, Bell R, Wong J, Armour E. SU-E-J-258: Inter- and Intra-Fraction Setup Stability and Couch Change Tolerance for Image Guided Radiation Therapy. Med Phys 2014. [DOI: 10.1118/1.4888312] [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: 11/07/2022] Open
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35
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De Lisle SP, Rowe L. Interactive effects of competition and social environment on the expression of sexual dimorphism. J Evol Biol 2014; 27:1069-77. [DOI: 10.1111/jeb.12381] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 02/27/2014] [Accepted: 03/23/2014] [Indexed: 11/30/2022]
Affiliation(s)
- S. P. De Lisle
- Department of Ecology and Evolutionary Biology; University of Toronto; Toronto ON Canada
| | - L. Rowe
- Department of Ecology and Evolutionary Biology; University of Toronto; Toronto ON Canada
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Wyman MJ, Stinchcombe JR, Rowe L. A multivariate view of the evolution of sexual dimorphism. J Evol Biol 2014; 26:2070-80. [PMID: 24028470 DOI: 10.1111/jeb.12188] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [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: 12/17/2012] [Revised: 04/08/2013] [Accepted: 04/12/2013] [Indexed: 12/31/2022]
Abstract
Sexual differences are often dramatic and widespread across taxa. Their extravagance and ubiquity can be puzzling because the common underlying genome of males and females is expected to impede rather than foster phenotypic divergence. Widespread dimorphism, despite a shared genome, may be more readily explained by considering the multivariate, rather than univariate, framework governing the evolution of sexual dimorphism. In the univariate formulation, differences in genetic variances and a low intersexual genetic correlation (rMF) can facilitate the evolution of sexual dimorphism. However, studies that have analysed sex-specific differences in heritabilities or genetic variances do not always find significant differences. Furthermore, many of the reported estimates of rMF are very high and positive. When monomorphic heritabilities and a high rMF are present together, the evolution of sexual dimorphism on a trait-by-trait basis is severely constrained. By contrast, the multivariate formulation has greater generality and more flexibility. Although the number of multivariate sexual dimorphism studies is low, almost all support sex-specific differences in the G (variance-covariance) matrix; G matrices can differ with respect to size and/or orientation, affecting the response to selection differently between the sexes. Second, whereas positive values of the univariate quantity rMF only hinder positive changes in sexual dimorphism, positive covariances in the intersexual covariance B matrix can either help or hinder. Similarly, the handful of studies reporting B matrices indicate that it is often asymmetric, so that B can affect the evolution of single traits differently between the sexes. Multivariate approaches typically demonstrate that genetic covariances among traits can strongly constrain trait evolution when compared with univariate approaches. By contrast, in the evolution of sexual dimorphism, a multivariate view potentially reveals more opportunities for sexual dimorphism to evolve by considering the effect sex-specific selection has on sex-specific G matrices and an asymmetric B matrix.
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Affiliation(s)
- M J Wyman
- Department of Ecology & Evolutionary Biology, University of Toronto, Toronto, ON, Canada
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Bashir A, Klammer A, Robins WP, Chin CS, Webster D, Paxinos E, Hsu D, Ashby M, Wang S, Peluso P, Sebra R, Sorenson J, Bullard J, Yen J, Valdovino M, Mollova E, Luong K, Lin S, LaMay B, Joshi A, Rowe L, Frace M, Tarr CL, Turnsek M, Davis BM, Kasarskis A, Mekalanos JJ, Waldor MK, Schadt EE. A hybrid approach for the automated finishing of bacterial genomes. Nat Biotechnol 2012; 30:701-707. [PMID: 22750883 DOI: 10.1038/nbt.2288] [Citation(s) in RCA: 158] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2012] [Accepted: 05/30/2012] [Indexed: 02/08/2023]
Abstract
Advances in DNA sequencing technology have improved our ability to characterize most genomic diversity. However, accurate resolution of large structural events is challenging because of the short read lengths of second-generation technologies. Third-generation sequencing technologies, which can yield longer multikilobase reads, have the potential to address limitations associated with genome assembly. Here we combine sequencing data from second- and third-generation DNA sequencing technologies to assemble the two-chromosome genome of a recent Haitian cholera outbreak strain into two nearly finished contigs at >99.9% accuracy. Complex regions with clinically relevant structure were completely resolved. In separate control assemblies on experimental and simulated data for the canonical N16961 cholera reference strain, we obtained 14 scaffolds of greater than 1 kb for the experimental data and 8 scaffolds of greater than 1 kb for the simulated data, which allowed us to correct several errors in contigs assembled from the short-read data alone. This work provides a blueprint for the next generation of rapid microbial identification and full-genome assembly.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Lori Rowe
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta GA 30333
| | - Michael Frace
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta GA 30333
| | - Cheryl L Tarr
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta GA 30333
| | - Maryann Turnsek
- National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Atlanta GA 30333
| | - Brigid M Davis
- Channing Laboratory, Brigham and Women's Hospital, Boston, MA.,Department of Medicine, Harvard Medical School, Boston, MA.,Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA.,Howard Hughes Medical Institute, Boston, MA
| | | | | | - Matthew K Waldor
- Channing Laboratory, Brigham and Women's Hospital, Boston, MA.,Department of Medicine, Harvard Medical School, Boston, MA.,Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA.,Howard Hughes Medical Institute, Boston, MA
| | - Eric E Schadt
- Pacific Biosciences, Menlo Park, CA.,Department of Genetics and Genomic Sciences, Mount Sinai School of Medicine, New York City
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Reimer AR, Van Domselaar G, Stroika S, Walker M, Kent H, Tarr C, Talkington D, Rowe L, Olsen-Rasmussen M, Frace M, Sammons S, Dahourou GA, Boncy J, Smith AM, Mabon P, Petkau A, Graham M, Gilmour MW, Gerner-Smidt P. Comparative genomics of Vibrio cholerae from Haiti, Asia, and Africa. Emerg Infect Dis 2012; 17:2113-21. [PMID: 22099115 PMCID: PMC3310578 DOI: 10.3201/eid1711.110794] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
A strain from Haiti shares genetic ancestry with those from Asia and Africa. Cholera was absent from the island of Hispaniola at least a century before an outbreak that began in Haiti in the fall of 2010. Pulsed-field gel electrophoresis (PFGE) analysis of clinical isolates from the Haiti outbreak and recent global travelers returning to the United States showed indistinguishable PFGE fingerprints. To better explore the genetic ancestry of the Haiti outbreak strain, we acquired 23 whole-genome Vibriocholerae sequences: 9 isolates obtained in Haiti or the Dominican Republic, 12 PFGE pattern-matched isolates linked to Asia or Africa, and 2 nonmatched outliers from the Western Hemisphere. Phylogenies for whole-genome sequences and core genome single-nucleotide polymorphisms showed that the Haiti outbreak strain is genetically related to strains originating in India and Cameroon. However, because no identical genetic match was found among sequenced contemporary isolates, a definitive genetic origin for the outbreak in Haiti remains speculative.
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Abstract
Within populations, the amount of environmental and genetic variation present may differ greatly among traits measured at multiple times over ontogeny. Brief periods of food deprivation are often followed by a period of accelerated (compensatory) growth. Early laboratory studies likewise reported a contraction of genetic variance in size as maturation approached. However, studies of wild populations often contradict these laboratory results. One possibility is that environmentally imposed stress is exposing genetic variance not seen in the laboratory. We tested the effect of rearing environment (high or low food) on genetic variance in size traits measured at two ages in the ladybird beetle Harmonia axyridis. A substantial amount of genetic variance was present in all combinations of rearing environment by ontogenetic stage among males. The pattern of change in male variance in mass over ontogeny was of opposite sign in the two food treatments, which may reflect cryptic genetic variance that is apparent only under stress. The proportion of overall variance that was due to additive genetic effects was much lower in females than in males, which suggests that the underlying genetics of female growth trajectories differs from that males. Our experimental design afforded an initial exploration of the genetics of compensatory growth.
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Affiliation(s)
- C Dmitriew
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario M5S 3B2, Canada.
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Abstract
BACKGROUND Right to left shunt and regional hypoventilation (reduced ventilation/perfusion ratio (V(A)/Q)) have different effects on the curve relating inspired oxygen (P(I)O(2)) to oxygen saturation measured by pulse oximetry (SpO(2)) and can be derived non-invasively from measurements of SpO(2) and inspired oxygen pressure (P(I)O(2)) using complex models of gas exchange. We developed a simpler computerised "slide-rule" method of making these derivations. AIMS To describe the slide-rule method and determine agreement between measurements derived with this and a more complex algorithm. METHODS Series of P(I)O(2) versus SpO(2) data points obtained during 43 studies in 16 preterm infants with bronchopulmonary dysplasia were analysed. Percentage shunt and the degree of right shift (kPa) of the P(I)O(2) versus SpO(2) curve compared with the oxyhaemoglobin dissociation curve (a measure of V(A)/Q) were determined for each dataset with both methods, and the results were compared using the method of Bland and Altman. RESULTS The computer slide-rule method produced results for all 43 datasets. The more complex model could derive results for 40/43 datasets. The mean differences (95% limits of agreement) between the two methods for measurements of shunt were -1.7% (-6.5 to +3.5%) and for measurements of right shift were 0.3 kPa (-2.9 to +3.6 kPa). CONCLUSION The slide-rule method was reliable for deriving shunt and right shift (reduced V(A)/Q) of the P(I)O(2) versus SpO(2) curve when compared with the more complex algorithm. The new method should enable wider clinical application of these measurements of oxygen exchange.
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Affiliation(s)
- L Rowe
- Department of Anaesthetics, Norfolk and Norwich University Hospital, Norwich, UK
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Dmitriew C, Carroll J, Rowe L. Effects of early growth conditions on body composition, allometry, and survival in the ladybird beetle Harmonia axyridis. CAN J ZOOL 2009. [DOI: 10.1139/z09-001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
During both the larval and adult stages, the ladybird beetles Harmonia axyridis (Pallas, 1773) feed primarily on aphids, populations of which may fluctuate dramatically in time and space. Harmonia axyridis were reared under three resource treatments: high, low, and improving. We predicted that beetles experiencing consistently poor larval conditions would allocate limited resources to dispersal traits (by increasing relative wing surface area and fat storage), whereas larvae facing good or improving conditions were predicted to allocate preferentially to reproductive traits. As predicted, beetles reared at low food had lower wing loading and stored more fat than individuals reared at consistently high food. When conditions were initially poor but improved during development, body size was reduced relative to the high food treatment, though wing area scaled similarly. Allocation of fat and protein was dependent on both sex and treatment. Females in improving conditions stored less fat, and males less protein, relative to low food conditions. This is suggestive of a trade-off between reproduction and dispersal that is resolved differently between the sexes. Unexpectedly, adult survival under starvation was not appreciably affected by larval growth conditions, although males lived about 10 days longer, on average.
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Affiliation(s)
- C. Dmitriew
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
| | - J. Carroll
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
| | - L. Rowe
- Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, ON M5S 3B2, Canada
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Dikici E, Qu X, Rowe L, Millner L, Logue C, Deo SK, Ensor M, Daunert S. Aequorin variants with improved bioluminescence properties. Protein Eng Des Sel 2009; 22:243-8. [PMID: 19168563 DOI: 10.1093/protein/gzn083] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The photoprotein aequorin has been widely used as a bioluminescent label in immunoassays, for the determination of calcium concentrations in vivo, and as a reporter in cellular imaging. It is composed of apoaequorin (189 amino acid residues), the imidazopyrazine chromophore coelenterazine and molecular oxygen. The emission characteristics of aequorin can be changed by rational design of the protein to introduce mutations in its structure, as well as by substituting different coelenterazine analogues to yield semi-synthetic aequorins. Variants of aequorin were created by mutating residues His16, Met19, Tyr82, Trp86, Trp108, Phe113 and Tyr132. Forty-two aequorin mutants were prepared and combined with 10 different coelenterazine analogues in a search for proteins with different emission wavelengths, altered decay kinetics and improved stability. This spectral tuning strategy resulted in semi-synthetic photoprotein mutants with significantly altered bioluminescent properties.
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Affiliation(s)
- E Dikici
- Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, USA
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Punzalan D, Cooray M, Helen Rodd F, Rowe L. Condition dependence of sexually dimorphic colouration and longevity in the ambush bug Phymata americana. J Evol Biol 2008; 21:1297-306. [PMID: 18631280 DOI: 10.1111/j.1420-9101.2008.01571.x] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sexually selected traits that are costly are predicted to be more condition dependent than nonsexually selected traits. Assuming resource limitation, increased allocation to a sexually selected trait may also come at a cost to other fitness components. To test these predictions, we varied adult food ration to manipulate condition in the colour dimorphic bug, Phymata americana. We compared the degree of condition dependence in a sexually selected trait expressed in males to a nonsexually selected trait expressed in males and females. We also evaluated the effects of condition on longevity of both sexes. We found that the expression of these colour pattern traits was strongly influenced by both diet and age. As expected, the strength of condition dependence was much more pronounced in the sexually selected, male-limited trait but the nonsexual trait also exhibited significant condition dependence in both sexes. The sexually selected male trait also exhibited a higher coefficient of phenotypic variation than the nonsexually selected trait in males and females. Diet had contrasting effects on male and female longevity; increased food availability had positive effects on female lifespan but these effects were not detected in males, suggesting that males allocated limited resources preferentially to sexually selected traits. These results are consistent with the expectation that optimal allocation to various fitness components differs between the sexes.
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Affiliation(s)
- D Punzalan
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.
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Rowe L, Rothert A, Logue C, Ensor C, Deo S, Daunert S. Spectral tuning of photoproteins by partnering site-directed mutagenesis strategies with the incorporation of chromophore analogs. Protein Eng Des Sel 2008; 21:73-81. [DOI: 10.1093/protein/gzm073] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Abstract
Acceleration of growth following a period of diet restriction may result in either complete or partial catch-up in size. The existence of such compensatory growth indicates that organisms commonly grow at rates below their physiological maxima and this implies a cost for accelerated growth. We examined patterns of accelerated growth in response to temporary resource limitation, and assayed both short and long-term costs of this growth in the ladybird beetle Harmonia axyridis. Subsequent to the period of food restriction, accelerated growth resulted in complete compensation for body sizes, although we observed greater larval mortality during the period of compensation. There were no effects on female fecundity or survivorship within 3 months of maturation. Females did not discriminate against males that had undergone compensatory growth, nor did we observe effects on male mating behaviour. However, individuals that underwent compensatory growth died significantly sooner when deprived of food late in adult life, suggesting that longer-term costs of compensatory growth may be quite mild and detectable only under stressful conditions.
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Affiliation(s)
- C Dmitriew
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON, Canada.
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Dmitriew C, Cooray M, Rowe L. Effects of early resource-limiting conditions on patterns of growth, growth efficiency, and immune function at emergence in a damselfly (Odonata: Coenagrionidae). CAN J ZOOL 2007. [DOI: 10.1139/z07-004] [Citation(s) in RCA: 22] [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: 11/22/2022]
Abstract
Periods of restricted growth during early development are expected to have detrimental effects on subsequent metrics of fitness, most prominently increases in age and decreases in size at maturity. However, in some cases, animals may compensate by altering foraging effort, growth efficiency, or patterns of resource allocation between critical traits prior to maturation. Yet, even when compensation for age and size is complete, brief periods of restricted growth may carry costs persisting in the long term, and compensatory tactics may themselves be costly. We investigated the long-term costs of early growth restriction and mechanisms of compensatory growth in the damselfly Ischnura verticalis (Say, 1839). Larvae were temporarily exposed to one of three feeding regimes in the early stages of development, after which food levels were restored. In the period of unrestricted growth prior to emergence, partial compensation for structural size in the lowest food treatment was observed, while both resource-limited groups accelerated mass gain relative to controls. Changes in food consumption and food conversion efficiency were ruled out as mechanisms for accelerating growth following diet restriction. We tested for changes in resource allocation patterns that could explain the observed compensatory growth and found that adult body shape may depend on early growth conditions in females. There was no evidence of detrimental effects on immune function at emergence, although males tended to have higher phenoloxidase activity (a measure of immunocompetence) than females.
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Affiliation(s)
- C. Dmitriew
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S 3G5, Canada
| | - M. Cooray
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S 3G5, Canada
| | - L. Rowe
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S 3G5, Canada
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Abstract
In light of the inherent disadvantages of sexual reproduction, the existence of sex is often seen as a paradox. There are a variety of hypothetical benefits of sexual reproduction that may balance its disadvantages. The Red Queen hypothesis proposes that sexually reproducing species are better able to evolve resistance to parasites than asexually reproducing species. A prediction of the Red Queen hypothesis is that a parasite should evolve to preferentially exploit an asexual species over a sexual species. To test this central prediction of the Red Queen hypothesis, intensity of infection by the parasite Gyrodactylus eos Mayes, 1977 (Monogenea) was compared between sympatric asexual and sexual fish species in the genus Phoxinus Rafinesque, 1820. In each lake where these species coexist, the asexual fish should suffer higher intensities of infection than the sexual fish. In the majority of lakes sampled, there were more parasites on asexual than sexual fish.
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Affiliation(s)
- J.A. Mee
- Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, ON M5S 3G5, Canada
| | - L. Rowe
- Department of Zoology, University of Toronto, 25 Harbord Street, Toronto, ON M5S 3G5, Canada
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Rowe L. Training tribal leaders in Thailand. AIDS Health Promot Exch 2002:3-6. [PMID: 12318834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
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