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Purcell R, Yeoh D, Bowen A, Britton PN, Carr JP, Chen M, Cheung K, Clark J, Irwin A, Lai T, Lorenzen U, Steer A, Wen S, Williams P, Yap N, Cooper C, Gwee A. A multicentre, retrospective audit of fosfomycin use for urinary tract infections in Australian children and adolescents. J Antimicrob Chemother 2023:7163425. [PMID: 37190910 DOI: 10.1093/jac/dkad131] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 04/06/2023] [Indexed: 05/17/2023] Open
Abstract
BACKGROUND Urinary tract infections (UTIs) due to MDR organisms are increasingly common. The lack of paediatric data on efficacious antibiotics makes UTI treatment particularly challenging. Data on the efficacy of fosfomycin use for UTI in children are variable. METHODS We conducted a retrospective audit of children aged 0-18 years who were treated with fosfomycin for UTI at seven tertiary paediatric hospitals in Australia over a 7 year period, from 2014 to 2020. RESULTS Ninety-one children with a median age of 5 years (range 2 months to 18 years) received oral fosfomycin for UTI. The majority (57/91, 63%) had one or more comorbidity, with the most common being renal tract anomalies (24/91, 26%). Fifty-nine (65%) had febrile UTI, 14/91 (15%) had pyelonephritis and 1/91 (1%) was bacteraemic. A majority (80/91, 88%) of urinary cultures had an ESBL-producing Gram-negative pathogen isolated. Fosfomycin susceptibility was evident in all 80 isolates tested. For uncomplicated UTI, the most common dose in children aged <1, 1-12 and >12 years was 1, 2 and 3 g, respectively. For complicated UTI, doses of 2 and 3 g were most common. The median duration of fosfomycin administration was 5 days (range 1-82). Clinical cure was achieved in 84/90 (93%); the six with treatment failure had underlying comorbidities. Overall, 2/91 (2%) children experienced drug-related adverse effects comprising gastrointestinal symptoms in both, which resolved after treatment discontinuation. CONCLUSIONS Fosfomycin is well tolerated and associated with favourable treatment outcomes in children with UTI. Further research on the optimal dosing strategy is required.
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Affiliation(s)
- Rachael Purcell
- Department of General Medicine, Royal Children's Hospital, Melbourne, Australia
- Health Informatics Group, Murdoch Children's Research Institute, Melbourne, Australia
- Department of Paediatrics, The University of Melbourne, Melbourne, Australia
- Bioinformatics Group, Centre for Health Analytics, Royal Children's Hospital, Melbourne, Australia
| | - Daniel Yeoh
- Department of Infectious Diseases, Perth Children's Hospital, Perth, Australia
- Sir Peter MacCallum Department of Oncology, University of Melbourne, Parkville, Victoria, Australia
| | - Asha Bowen
- Department of Infectious Diseases, Perth Children's Hospital, Perth, Australia
- Westfarmer Centre for Vaccines and Infectious Diseases, Telethon Kids Institute, University of Western Australia, Perth, Australia
| | - Philip N Britton
- Department of Infectious Diseases and Immunology, Sydney Children's Hospitals Network, Sydney, Australia
- Sydney Institute for Infectious Diseases, The University of Sydney, Sydney, Australia
| | - Jeremy P Carr
- Department of Infection and Immunity, Monash Children's Hospital, Melbourne, Australia
- Department of Paediatrics, Monash University, Melbourne, Australia
- Department of Paediatrics, University of Oxford, Oxford, UK
| | - Ming Chen
- Department of Infectious Diseases, Adelaide Women's and Children's Hospital, Adelaide, Australia
| | - Kaman Cheung
- Department of Infection and Immunity, Monash Children's Hospital, Melbourne, Australia
| | - Julia Clark
- Infection Management and Prevention Service, Queensland Children's Hospital, Brisbane, Queensland, Australia
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Queensland, Australia
| | - Adam Irwin
- Infection Management and Prevention Service, Queensland Children's Hospital, Brisbane, Queensland, Australia
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Queensland, Australia
| | - Tony Lai
- Department of Infectious Diseases and Immunology, Sydney Children's Hospitals Network, Sydney, Australia
- Sydney Institute for Infectious Diseases, The University of Sydney, Sydney, Australia
| | - Ulrik Lorenzen
- Department of Infectious Diseases, Adelaide Women's and Children's Hospital, Adelaide, Australia
| | - Andrew Steer
- Department of General Medicine, Royal Children's Hospital, Melbourne, Australia
- Department of Paediatrics, The University of Melbourne, Melbourne, Australia
- Tropical Diseases Research Group, Murdoch Children's Research Institute, Melbourne, Australia
| | - Sophie Wen
- Infection Management and Prevention Service, Queensland Children's Hospital, Brisbane, Queensland, Australia
- UQ Centre for Clinical Research, The University of Queensland, Brisbane, Queensland, Australia
| | - Phoebe Williams
- Department of Infectious Diseases and Immunology, Sydney Children's Hospitals Network, Sydney, Australia
- Sydney Institute for Infectious Diseases, The University of Sydney, Sydney, Australia
- School of Public Health, The University of Sydney, Sydney, Australia
| | - Natalie Yap
- Department of General Medicine, Royal Children's Hospital, Melbourne, Australia
- Department of Infection and Immunity, Monash Children's Hospital, Melbourne, Australia
| | - Celia Cooper
- Department of Infectious Diseases, Adelaide Women's and Children's Hospital, Adelaide, Australia
- National Centre for Antimicrobial Stewardship, Adelaide, Australia
| | - Amanda Gwee
- Department of General Medicine, Royal Children's Hospital, Melbourne, Australia
- Department of Paediatrics, The University of Melbourne, Melbourne, Australia
- Infectious Diseases Group, Murdoch Children's Research Institute, Melbourne, Australia
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Carr JP, MacLennan JM, Plested E, Bratcher HB, Harrison OB, Aley PK, Bray JE, Camara S, Rodrigues CMC, Davis K, Bartolf A, Baxter D, Cameron JC, Cunningham R, Faust SN, Fidler K, Gowda R, Heath PT, Hughes S, Khajuria S, Orr D, Raman M, Smith A, Turner DP, Whittaker E, Williams CJ, Zipitis CS, Pollard AJ, Oliver J, Morales-Aza B, Lekshmi A, Clark SA, Borrow R, Christensen H, Trotter C, Finn A, Maiden MCJ, Snape MD. Impact of meningococcal ACWY conjugate vaccines on pharyngeal carriage in adolescents: evidence for herd protection from the UK MenACWY programme. Clin Microbiol Infect 2022; 28:1649.e1-1649.e8. [PMID: 35840033 DOI: 10.1016/j.cmi.2022.07.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 07/04/2022] [Accepted: 07/06/2022] [Indexed: 11/15/2022]
Abstract
OBJECTIVES Serogroup W and Y invasive meningococcal disease (IMD) increased globally from 2000 onwards. Responding to a rapid increase in serogroup W clonal complex 11 (W:cc11) IMD, the UK replaced an adolescent booster dose of meningococcal C conjugate vaccine with quadrivalent MenACWY conjugate vaccine in 2015. By 2018, vaccine coverage in the eligible school cohorts aged 14-19 years-old was 84%. We assessed the impact of the MenACWY vaccination programme on meningococcal carriage. METHODS An observational study of culture-defined oropharyngeal meningococcal carriage prevalence before and after the start of the MenACWY vaccination programme in UK school students, aged 15-19 years, using two cross-sectional studies: 2014-15 "UKMenCar4" and 2018 "Be on the TEAM" (ISRCTN75858406). RESULTS A total of 10625 participants pre-implementation and 13434 post-implementation were included. Carriage of genogroups C, W, and Y (combined) decreased from 2·03% to 0·71% (OR 0·34 [95% CI 0·27-0·44] p<0·001). Carriage of genogroup B meningococci did not change (1·26% vs 1·23% [95% CI 0.77-1.22] p=0·80) and genogroup C remained rare (n = 7/10625 vs 17/13488, p=0·135). The proportion of serogroup positive isolates, i.e., those expressing capsule, decreased for genogroup W by 53.8% (95% CI -5.0%-79.8%, p=0·016) and for genogroup Y by 30·1% (95% CI 8·9%-46·3%, p=0·0025). CONCLUSIONS The UK MenACWY vaccination programme reduced carriage acquisition of genogroup and serogroup Y and W meningococci and sustained low levels of genogroup C carriage. These data support the use of quadrivalent MenACWY conjugate vaccine for indirect (herd) protection.
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Affiliation(s)
- Jeremy P Carr
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK; Monash University, Melbourne, Australia; Monash Children's Hospital, Melbourne, Australia
| | | | - Emma Plested
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK
| | | | | | - Parvinder K Aley
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK
| | | | - Susana Camara
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK
| | - Charlene M C Rodrigues
- Department of Zoology, University of Oxford, UK; Department of Paediatric Infectious Diseases, Great Ormond Street Hospital for Children NHS Foundation Trust, UK
| | - Kimberly Davis
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK
| | - Angela Bartolf
- St George's Vaccine Institute, Institute of Infection & Immunity; St George's University of London, UK
| | | | | | | | - Saul N Faust
- NIHR Southampton Clinical Research Facility and NIHR Southampton Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust; and Faculty of Medicine and Institute for Life Sciences, University of Southampton, Southampton, UK
| | - Katy Fidler
- Brighton and Sussex Medical School, UK; Royal Alexandra Children's Hospital, University Hospital Sussex NHS Foundation Trust, Brighton, UK
| | | | - Paul T Heath
- St George's Vaccine Institute, Institute of Infection & Immunity; St George's University of London, UK
| | - Stephen Hughes
- Royal Manchester Children's Hospital; Manchester University NHS Foundation Trust, UK
| | | | - David Orr
- Lancashire Teaching Hospitals NHS Foundation Trust, UK
| | - Mala Raman
- University Hospitals Plymouth NHS Foundation Trust, UK
| | - Andrew Smith
- Glasgow Dental Hospital & School, College of Medical, Veterinary & Life Sciences, University of Glasgow, UK
| | - David Pj Turner
- School of Life Sciences, University of Nottingham & Nottingham University Hospitals NHS Trust, UK
| | - Elizabeth Whittaker
- Imperial College London, UK; Imperial College Healthcare NHS Trust, London, UK
| | | | - Christos S Zipitis
- Wrightington, Wigan and Leigh Teaching Hospitals NHS Foundation Trust, UK
| | - Andrew J Pollard
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK
| | - Jennifer Oliver
- Bristol Children's Vaccine Centre, University of Bristol, UK
| | | | - Aiswarya Lekshmi
- UK Health Security Agency Meningococcal Reference Unit, Manchester Royal Infirmary Manchester, UK
| | - Stephen A Clark
- UK Health Security Agency Meningococcal Reference Unit, Manchester Royal Infirmary Manchester, UK
| | - Ray Borrow
- UK Health Security Agency Meningococcal Reference Unit, Manchester Royal Infirmary Manchester, UK
| | - Hannah Christensen
- School of Population Health Sciences, Bristol Medical School, University of Bristol, UK
| | | | - Adam Finn
- School of Population Health Sciences, Bristol Medical School, University of Bristol, UK
| | - Martin C J Maiden
- Department of Zoology, University of Oxford, 11a Mansfield Road, Oxford, OX1 3SZ, United Kingdom.
| | - Matthew D Snape
- Oxford Vaccine Group, Department of Paediatrics, University of Oxford, and the National Institute for Health Research (NIHR) Oxford Biomedical Research Centre, Oxford, UK
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Fening KO, Forchibe EE, Wamonje FO, Adama I, Afreh-Nuamah K, Carr JP. First Report and Distribution of the Indian Mustard Aphid, Lipaphis erysimi pseudobrassicae (Hemiptera: Aphididae) on Cabbage (Brassica oleracea var capitata) in Ghana. J Econ Entomol 2020; 113:1363-1372. [PMID: 32270189 DOI: 10.1093/jee/toaa057] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Indexed: 06/11/2023]
Abstract
The presence of large colonies of aphids is associated with a devastating novel necrotic disease of cabbage (Brassica oleracea var. capitata) in Ghana that is thought to be of viral etiology. In this study, we used molecular taxonomic tools to identify the aphid species present on these diseased cabbage plants. This was confirmed using two key features for morphological identification, involving the length of cornicles and shape of cauda for the wingless forms of the aphids. Two species of aphids were identified and their distribution in Ghana indicated. One was the generalist aphid Myzus persicae (Sulzer) (Hemiptera: Aphididae) but the most abundant was the brassica specialist aphid, Lipaphis erysimi pseudobrassicae (Davis) (Hemiptera: Aphididae), which is one of the most destructive pests of brassica crops in some countries in Africa and other parts of the world. L. erysimi has been reported in Benin, Mali, South Africa, India, China, and United States, but this is the first formal report of L. erysimi pseudobrassicae in Ghana. The correct identification of L. erysimi is crucial, suggesting that it has recently become one of the most common species of aphid found on cabbage plants in Ghana.
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Affiliation(s)
- K O Fening
- Soil and Irrigation Research Centre, School of Agriculture, College of Basic and Applied Sciences, University of Ghana, Accra, Ghana
- African Regional Postgraduate Program in Insect Science (ARPPIS), College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana
| | - E E Forchibe
- African Regional Postgraduate Program in Insect Science (ARPPIS), College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana
| | - F O Wamonje
- Department of Plant Sciences, University of Cambridge, Cambridge, UK
| | - I Adama
- CSIR-Crops Research Institute, Kumasi, Ghana
| | - K Afreh-Nuamah
- African Regional Postgraduate Program in Insect Science (ARPPIS), College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana
- Forest and Horticultural Crops Research Centre (FOHCREC), School of Agriculture, College of Basic and Applied Sciences, University of Ghana, Legon, Accra, Ghana
| | - J P Carr
- Department of Plant Sciences, University of Cambridge, Cambridge, UK
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Osowicki J, Carr JP, Steer AC. Rheumatic fever: The rebound phenomenon returns. J Paediatr Child Health 2018; 54:685-688. [PMID: 29411467 DOI: 10.1111/jpc.13848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 12/05/2017] [Accepted: 01/05/2018] [Indexed: 11/28/2022]
Affiliation(s)
- Joshua Osowicki
- Group A Streptococcus Research Group, Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Victoria, Australia.,Infectious Diseases Unit, Department of General Medicine, Royal Children's Hospital Melbourne, Melbourne, Victoria, Australia.,Department of Paediatric Infection and Immunity, Monash Children's Hospital, Melbourne, Victoria, Australia
| | - Jeremy P Carr
- Infectious Diseases Unit, Department of General Medicine, Royal Children's Hospital Melbourne, Melbourne, Victoria, Australia
| | - Andrew C Steer
- Group A Streptococcus Research Group, Murdoch Children's Research Institute, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Victoria, Australia.,Infectious Diseases Unit, Department of General Medicine, Royal Children's Hospital Melbourne, Melbourne, Victoria, Australia
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Carr JP, Burgner DP, Hardikar RS, Buttery JP. Empiric antibiotic regimens for neonatal sepsis in Australian and New Zealand neonatal intensive care units. J Paediatr Child Health 2017; 53:680-684. [PMID: 28421643 DOI: 10.1111/jpc.13540] [Citation(s) in RCA: 7] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Revised: 11/24/2016] [Accepted: 01/08/2017] [Indexed: 11/29/2022]
Abstract
AIM Neonatal sepsis remains an important cause of morbidity and mortality, and requires prompt empiric treatment. However, only a minority of babies who receive antibiotics for suspected sepsis have an infection. Antimicrobial exposure in infancy has important short- and long-term consequences. There is no consensus regarding empirical antimicrobial regimens. METHODS The study included a survey of empiric antimicrobial regimens in all tertiary neonatal intensive care units in Australia and New Zealand in 2013-2014. RESULTS All 27 units responded. For early-onset sepsis, all units used a combination of gentamicin with either penicillin or ampicillin. For late-onset sepsis, the frequency of units using empiric vancomycin (41%) versus empiric flucloxacillin (48%) was similar. Gestational age or the presence of a central venous catheter had little influence on using vancomycin instead of flucloxacillin. For late-onset sepsis with meningitis there was marked variation in antimicrobial combinations, with 15 different regimens described. A total of 93% used a cefotaxime-based regimen, either as monotherapy (22%) or combined with a second (22%) or third (48%) agent. For suspected necrotising enterocolitis, 89% used an aminoglycoside, metronidazole and a penicillin. Historical outbreaks of multi-resistant organisms exerted long-term influence over regimen choice. CONCLUSIONS There was limited use of broad-spectrum agents such as carbapenems or third-generation cephalosporins. In this region with low methicillin-resistant Staphylococcus aureus prevalence, empiric vancomycin use was common, selected for activity against coagulase-negative staphylococci. Empiric vancomycin is rarely necessary because coagulase-negative staphylococci are often contaminants and sepsis is rarely fulminant, occurring almost exclusively in extremely low birthweight infants. Implementation of appropriate, local antimicrobial policies is crucial to minimise antimicrobial exposure in this vulnerable population and halt the development of antimicrobial resistance.
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Affiliation(s)
- Jeremy P Carr
- Department of Infection and Immunity, Monash Children's Hospital, Melbourne, Victoria, Australia
| | - David P Burgner
- Department of Infection and Immunity, Monash Children's Hospital, Melbourne, Victoria, Australia.,Department of Paediatrics, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,Murdoch Childrens Research Institute, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Victoria, Australia
| | - Rohan S Hardikar
- Department of Paediatrics, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia
| | - Jim P Buttery
- Department of Infection and Immunity, Monash Children's Hospital, Melbourne, Victoria, Australia.,Department of Paediatrics, School of Clinical Sciences, Monash University, Melbourne, Victoria, Australia.,Murdoch Childrens Research Institute, Melbourne, Victoria, Australia.,Department of Paediatrics, University of Melbourne, Melbourne, Victoria, Australia.,The Ritchie Centre, Hudson Institute of Medical Research, Melbourne, Victoria, Australia
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Carr JP, Curtis N, Smeesters PR, Steer A. QUESTION 1: Are household contacts of patients with invasive group A streptococcal disease at higher risk of secondary infection? Arch Dis Child 2016; 101:198-201. [PMID: 26792903 DOI: 10.1136/archdischild-2015-309788] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Jeremy P Carr
- Infectious Diseases Unit, The Royal Children's Hospital, Parkville, Victoria, Australia
| | - Nigel Curtis
- Infectious Diseases Unit, The Royal Children's Hospital, Parkville, Victoria, Australia Department of Paediatrics, The University of Melbourne, Parkville, Victoria, Australia Murdoch Children's Research Institute, Parkville, Victoria, Australia
| | - Pierre R Smeesters
- Department of Paediatrics, The University of Melbourne, Parkville, Victoria, Australia Murdoch Children's Research Institute, Parkville, Victoria, Australia Paediatric Department, Academic Children Hospital Queen Fabiola, Université Libre de Bruxelles, Brussels, Belgium
| | - Andrew Steer
- Infectious Diseases Unit, The Royal Children's Hospital, Parkville, Victoria, Australia Department of Paediatrics, The University of Melbourne, Parkville, Victoria, Australia Murdoch Children's Research Institute, Parkville, Victoria, Australia
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Diamond Y, Carr JP, Gwee A, Freyne B. Brain Abscess Due to Staphylococcus lugdunenis: A CoNSiderable Pathogen. J Pediatr 2015; 167:939-939.e1. [PMID: 26231829 DOI: 10.1016/j.jpeds.2015.06.051] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2015] [Revised: 06/08/2015] [Accepted: 06/25/2015] [Indexed: 10/23/2022]
Affiliation(s)
- Yonatan Diamond
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital, Parkville, Australia
| | - Jeremy P Carr
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital, Parkville, Australia
| | - Amanda Gwee
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital, Parkville, Australia; Murdoch Children's Research Institute, The Royal Children's Hospital, Parkville, Australia; Department of Paediatrics, University of Melbourne, The Royal Children's Hospital, Parkville, Australia
| | - Bridget Freyne
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital, Parkville, Australia; Murdoch Children's Research Institute, The Royal Children's Hospital, Parkville, Australia
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Osowicki J, Carr JP, Bryant PA, Gwee A. Comment on: Comparison of oral amoxicillin given thrice or twice daily to children between 2 and 59 months old with non-severe pneumonia: a randomized controlled trial. J Antimicrob Chemother 2014; 70:635-6. [PMID: 25298515 DOI: 10.1093/jac/dku398] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Affiliation(s)
- Joshua Osowicki
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital Melbourne, Parkville, Victoria, Australia
| | - Jeremy P Carr
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital Melbourne, Parkville, Victoria, Australia
| | - Penelope A Bryant
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital Melbourne, Parkville, Victoria, Australia Murdoch Children's Research Institute, Parkville, Victoria, Australia Department of Paediatrics, The University of Melbourne, Parkville, Victoria, Australia
| | - Amanda Gwee
- Infectious Diseases Unit, Department of General Medicine, The Royal Children's Hospital Melbourne, Parkville, Victoria, Australia Murdoch Children's Research Institute, Parkville, Victoria, Australia
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Malamy J, Carr JP, Klessig DF, Raskin I. Salicylic Acid: a likely endogenous signal in the resistance response of tobacco to viral infection. Science 2010; 250:1002-4. [PMID: 17746925 DOI: 10.1126/science.250.4983.1002] [Citation(s) in RCA: 586] [Impact Index Per Article: 41.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Some cultivars of tobacco are resistant to tobacco mosaic virus (TMV) and synthesize pathogenesis-related (PR) proteins upon infection. In a search for the signal or signals that induce resistance or PR genes, it was found that the endogenous salicylic acid levels in resistant, but not susceptible, cultivars increased at least 20-fold in infected leaves and 5-fold in uninfected leaves after TMV inoculation. Induction of PRl genes paralleled the rise in salicylic acid levels. Since earlier work has demonstrated that treatment with exogenous salicylic acid induces PR genes and resistance, these findings suggest that salicylic acid functions as the natural transduction signal.
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Carr JP, Dixon DC, Klessig DF. Synthesis of pathogenesis-related proteins in tobacco is regulated at the level of mRNA accumulation and occurs on membrane-bound polysomes. Proc Natl Acad Sci U S A 2010; 82:7999-8003. [PMID: 16593627 PMCID: PMC391429 DOI: 10.1073/pnas.82.23.7999] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The pathogenesis-related (PR) proteins of tobacco plants are induced in response to a variety of pathogenic and chemical agents. Although the function of these proteins is unknown, they are associated with resistance to multiplication and/or spread of tobacco mosaic virus. We report that functional mRNAs encoding PR proteins are present only when synthesis of these proteins has been induced, suggesting that their synthesis is controlled in part at the level of mRNA accumulation. In addition PR proteins appear to be synthesized and processed in a manner analogous to proteins destined for the endoplasmic reticulum since (i) the in vitro translation products synthesized in the wheat-germ cell-free system are slightly larger than the in vivo products, (ii) translation of PR mRNAs in the rabbit reticulocyte lysate system is blocked unless that system is supplemented with dog pancreas microsomes, and (iii) mRNAs for PR proteins are associated predominantly with membrane-bound polysomes in vivo. This pathway of synthesis and posttranslational modification suggests possible sites of action of these proteins.
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Affiliation(s)
- J P Carr
- Department of Cellular, Viral and Molecular Biology, School of Medicine, University of Utah, Salt Lake City, UT 84132
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Berry JO, Carr JP, Klessig DF. mRNAs encoding ribulose-1,5-bisphosphate carboxylase remain bound to polysomes but are not translated in amaranth seedlings transferred to darkness. Proc Natl Acad Sci U S A 2010; 85:4190-4. [PMID: 16593940 PMCID: PMC280392 DOI: 10.1073/pnas.85.12.4190] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
When light-grown seedlings of amaranth are transferred to total darkness, synthesis of the large subunit (LS) and small subunit (SS) of ribulose-1,5-bisphosphate carboxylase [RbuP(2)Case; 3-phospho-D-glycerate carboxylase (dimerizing), EC 4.1.1.39] is rapidly depressed. This reduction in RbuP(2)Case synthesis occurs in the absence of any corresponding changes in levels of functional mRNA for either subunit. Four hours after light-to-dark transition little, if any, changes in the distribution of LS and SS mRNAs on polysomes could be detected. The association of these mRNAs with polysomes was authenticated by treatment with RNase A or puromycin. Furthermore, polysomes were able to synthesize LS and SS precursor in cell-free translation systems supplemented with inhibitors of initiation. Therefore, during a light-to-dark transition LS and SS mRNAs remained bound to polysomes but were not translated in vivo, suggesting that control is exercised, in part, at the translational elongation step.
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Affiliation(s)
- J O Berry
- Waksman Institute of Microbiology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854
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Pemberton CL, Whitehead NA, Sebaihia M, Bell KS, Hyman LJ, Harris SJ, Matlin AJ, Robson ND, Birch PRJ, Carr JP, Toth IK, Salmond GPC. Novel quorum-sensing-controlled genes in Erwinia carotovora subsp. carotovora: identification of a fungal elicitor homologue in a soft-rotting bacterium. Mol Plant Microbe Interact 2005; 18:343-53. [PMID: 15828686 DOI: 10.1094/mpmi-18-0343] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Seven new genes controlled by the quorum-sensing signal molecule N-(3-oxohexanoyl)-L-homoserine lactone (OHHL) have been identified in Erwinia carotovora subsp. carotovora. Using TnphoA as a mutagen, we enriched for mutants defective in proteins that could play a role in the interaction between E. carotovora subsp. carotovora and its plant hosts, and identified NipEcc and its counterpart in E. carotovora subsp. atroseptica. These are members of a growing family of proteins related to Nep1 from Fusarium oxysporum which can induce necrotic responses in a variety of dicotyledonous plants. NipEcc produced necrosis in tobacco, NipEca affected potato stem rot, and both affected virulence in potato tubers. In E. carotovora subsp. carotovora, nip was shown to be subject to weak repression by the LuxR family regulator, EccR, and may be regulated by the negative global regulator RsmA.
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Morris K, MacKerness SA, Page T, John CF, Murphy AM, Carr JP, Buchanan-Wollaston V. Salicylic acid has a role in regulating gene expression during leaf senescence. Plant J 2000; 23:677-85. [PMID: 10972893 DOI: 10.1046/j.1365-313x.2000.00836.x] [Citation(s) in RCA: 253] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Leaf senescence is a complex process that is controlled by multiple developmental and environmental signals and is manifested by induced expression of a large number of different genes. In this paper we describe experiments that show, for the first time, that the salicylic acid (SA)-signalling pathway has a role in the control of gene expression during developmental senescence. Arabidopsis plants defective in the SA-signalling pathway (npr1 and pad4 mutants and NahG transgenic plants) were used to investigate senescence-enhanced gene expression, and a number of genes showed altered expression patterns. Senescence-induced expression of the cysteine protease gene SAG12, for example, was conditional on the presence of SA, together with another unidentified senescence-specific factor. Changes in gene expression patterns were accompanied by a delayed yellowing and reduced necrosis in the mutant plants defective in SA-signalling, suggesting a role for SA in the cell death that occurs at the final stage of senescence. We propose the presence of a minimum of three senescence-enhanced signalling factors in senescing leaves, one of which is SA. We also suggest that a combination of signalling factors is required for the optimum expression of many genes during senescence.
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Affiliation(s)
- K Morris
- Department of Plant Genetics and Biotechnology, Horticulture Research International, Wellesbourne, Warwick CV35 9EF, UK
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Taylor DN, Carr JP. The GCD10 subunit of yeast eIF-3 binds the methyltransferase-like domain of the 126 and 183 kDa replicase proteins of tobacco mosaic virus in the yeast two-hybrid system. J Gen Virol 2000; 81:1587-91. [PMID: 10811942 DOI: 10.1099/0022-1317-81-6-1587] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The tobacco mosaic virus (TMV) replicase complex contains virus- and host-encoded proteins. In tomato, one of these host proteins was reported previously to be related serologically to the GCD10 subunit of yeast eIF-3. The yeast two-hybrid system has now been used to show that yeast GCD10 interacts selectively with the methyltransferase domain shared by the 126 and 183 kDa TMV replicase proteins. These findings are consistent with a role for a GCD10-like protein in the TMV replicase complex and suggest that, in TMV-infected cells, the machinery of virus replication and protein synthesis may be closely connected.
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Affiliation(s)
- D N Taylor
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK
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Abstract
The cucumoviral 2b protein is a viral counterdefence factor that interferes with the establishment of virus-induced gene silencing in plants. Synthetic peptides were used to generate an antibody to the 2b protein encoded by the Fny strain of cucumber mosaic virus (Fny-CMV). This polyclonal antibody was able to recognize the Fny-CMV 2b protein in a 10000 g pellet fraction of infected tobacco. No protein of equivalent size was detected in mock-inoculated or tobacco mosaic virus-infected samples. This represents the first demonstration of 2b protein expression by a subgroup I strain of CMV. Subcellular fractionation experiments on CMV-infected tobacco leaf tissue showed that the Fny-CMV 2b protein accumulated within a fraction that sedimented at forces of less than 5000 g and that the 2b protein was solubilized only by treatment with urea or SDS. These results suggested that the 2b protein associates either with the nucleus or cytoskeleton of the host cell. Further analysis showed that the 2b protein was enriched in a fraction that sedimented through a 2.2 M sucrose cushion. This fraction was also enriched in histones, suggesting that the CMV 2b protein associates preferentially with the host cell nucleus.
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Affiliation(s)
- C N Mayers
- Department of Plant Sciences, University of Cambridge, Cambridge CB2 3EA, UK
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Murphy AM, Chivasa S, Singh DP, Carr JP. Salicylic acid-induced resistance to viruses and other pathogens: a parting of the ways? Trends Plant Sci 1999; 4:155-160. [PMID: 10322550 DOI: 10.1016/s1360-1385(99)01390-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Resistance genes allow plants to recognize specific pathogens. Recognition results in the activation of a variety of defence responses, including localized programmed cell death (the hypersensitive response), synthesis of pathogenesis-related proteins and induction of systemic acquired resistance. These responses are co-ordinated by a branching signal transduction pathway. In tobacco, one branch activates virus resistance, and might require the mitochondrial alternative oxidase to operate. Here we discuss the evidence for this virus-specific branch of the transduction pathway and assess what must be done to further understand virus resistance and the role of the alternative oxidase in its induction.
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Affiliation(s)
- AM Murphy
- Dept of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK CB2 3EA
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Chivasa S, Carr JP. Cyanide restores N gene-mediated resistance to tobacco mosaic virus in transgenic tobacco expressing salicylic acid hydroxylase. Plant Cell 1998; 10:1489-1498. [PMID: 9724695 DOI: 10.2307/3870613] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Salicylhydroxamic acid (SHAM), an inhibitor of alternative oxidase (AOX), blocks salicylic acid-induced resistance to tobacco mosaic virus (TMV) but does not inhibit pathogenesis-related PR-1 protein synthesis or resistance to fungal and bacterial pathogens. We found that the synthetic resistance-inducing chemical 2, 6-dichloroisonicotinic acid also induced Aox transcript accumulation and SHAM-sensitive resistance to TMV. The respiratory inhibitors antimycin A and KCN also induced Aox transcript accumulation and resistance to TMV but did not induce PR-1 accumulation. Tobacco plants of the TMV-resistant cultivar Samsun NN transformed with the salicylic acid hydroxylase (nahG) gene could no longer restrict virus to the inoculation site, resulting in spreading necrosis instead of discrete necrotic lesions. Treatment with KCN restored TMV localization and normal lesion morphology. SHAM antagonized this effect, allowing virus escape and spreading necrosis to resume. The results demonstrate the importance of the SHAM-sensitive (potentially AOX-dependent) signal transduction pathway in mediating virus localization early in the hypersensitive response.
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Affiliation(s)
- S Chivasa
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom
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Chivasa S, Carr JP. Cyanide restores N gene-mediated resistance to tobacco mosaic virus in transgenic tobacco expressing salicylic acid hydroxylase. Plant Cell 1998; 10:1489-98. [PMID: 9724695 PMCID: PMC144082 DOI: 10.1105/tpc.10.9.1489] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Salicylhydroxamic acid (SHAM), an inhibitor of alternative oxidase (AOX), blocks salicylic acid-induced resistance to tobacco mosaic virus (TMV) but does not inhibit pathogenesis-related PR-1 protein synthesis or resistance to fungal and bacterial pathogens. We found that the synthetic resistance-inducing chemical 2, 6-dichloroisonicotinic acid also induced Aox transcript accumulation and SHAM-sensitive resistance to TMV. The respiratory inhibitors antimycin A and KCN also induced Aox transcript accumulation and resistance to TMV but did not induce PR-1 accumulation. Tobacco plants of the TMV-resistant cultivar Samsun NN transformed with the salicylic acid hydroxylase (nahG) gene could no longer restrict virus to the inoculation site, resulting in spreading necrosis instead of discrete necrotic lesions. Treatment with KCN restored TMV localization and normal lesion morphology. SHAM antagonized this effect, allowing virus escape and spreading necrosis to resume. The results demonstrate the importance of the SHAM-sensitive (potentially AOX-dependent) signal transduction pathway in mediating virus localization early in the hypersensitive response.
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Affiliation(s)
- S Chivasa
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, United Kingdom
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Carr JP, Gal-On A, Palukaitis P, Zaitlin M. Replicase-mediated resistance to cucumber mosaic virus in transgenic plants involves suppression of both virus replication in the inoculated leaves and long-distance movement. Virology 1994; 199:439-47. [PMID: 8122372 DOI: 10.1006/viro.1994.1142] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Tobacco plants transformed with a gene encoding a truncated cucumber mosaic virus (CMV) 2a replicase protein are resistant to systemic CMV disease. Experiments using protoplasts derived from plants of two R2-generation CMV-resistant transgenic plant lines (lines R2-2 and R2-5) showed that resistance operates at the single cell level. Low levels of CMV-specific RNAs were detected in CMV-inoculated protoplasts obtained from both R2-2 and R2-5 plants indicating that resistance is due at least in large part to a marked but incomplete suppression of virus replication. Leaves of immature plants belonging to line R2-2 occasionally exhibited local chlorosis when inoculated with high concentrations of CMV. Areas of local chlorosis were sites of low but detectable levels of CMV RNA, CMV virions, and CMV replicase activity, but did not act as foci for subsequent systemic disease. An antiserum raised against the CMV 2a replicase protein overexpressed in Escherichia coli was used to detect the presence of trace amounts of the truncated CMV 2a replicase protein in CMV-resistant transgenic tobacco plants. It was concluded that expression of the transgene, potentially as protein, engenders resistance primarily by suppressing virus replication but may also, to a lesser extent, do so by inhibiting systemic movement of the virus.
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Affiliation(s)
- J P Carr
- Department of Plant Pathology, Cornell University, Ithaca, New York 14853
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Carr JP, Marsh LE, Lomonossoff GP, Sekiya ME, Zaitlin M. Resistance to tobacco mosaic virus induced by the 54-kDa gene sequence requires expression of the 54-kDa protein. Mol Plant Microbe Interact 1992; 5:397-404. [PMID: 1282044 DOI: 10.1094/mpmi-5-397] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Tobacco plants transformed with the sequence encoding the 54-kDa putative replicase protein of tobacco mosaic virus were resistant to systemic virus disease (D. B. Golemboski, G. P. Lomonossoff, and M. Zaitlin, Proc. Natl. Acad. Sci. USA 87:6311-6315, 1990). Resistance was due to a marked suppression of virus replication at the site of inoculation (J. P. Carr and M. Zaitlin, Mol. Plant-Microbe Interact. 4:579-585, 1991). Although RNA transcripts encoding the 54-kDa protein were present in resistant plants, the 54-kDa protein itself was not observed in vivo. We wished to assess the relative importance of the 54-kDa protein versus its RNA in mediating resistance. Further attempts to detect the 54-kDa protein in plant tissues were unsuccessful; therefore, an indirect approach was taken using a protoplast-based transient gene expression system. Electroporation of protoplasts with plasmids capable of expressing the wild-type 54-kDa protein gene sequence or a mutant lacking the first AUG initiation codon of the 54-kDa open reading frame and encoding a slightly truncated protein reduced virus replication in protoplasts. In contrast, a frameshift mutant that was capable of directing synthesis of a protein only 20% the size of the 54-kDa protein, did not produce resistance in protoplasts. These results show that expression of the 54-kDa protein gene sequence at the RNA level alone is insufficient for resistance, and they implicate the 54-kDa protein itself in mediating this resistance phenomenon.
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Affiliation(s)
- J P Carr
- Department of Plant Pathology, Cornell University, Ithaca, NY 14853
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Bayne O, Chabot JM, Carr JP, Evans EF. Simultaneous dorsal dislocation of interphalangeal joints in a finger. Clin Orthop Relat Res 1990:104-6. [PMID: 2379350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Simultaneous proximal and distal interphalangeal joint dislocations in a single finger are rare. Even though the joints above and below are routinely evaluated, one of the joint dislocations can be missed. When phalangeal dislocations are suspected, special attention should be given to obtaining sufficient roentgenographic views both before and after reduction. The joints should be thoroughly examined in an attempt to distinguish capsular contraction from soft-tissue interposition. Failure to recognize initial simultaneous dislocations may result in capsular contraction and require surgical intervention.
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Affiliation(s)
- O Bayne
- Department of Orthopedics, Kaiser Permanente Medical Center, Hayward, California 94538
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Cutt JR, Harpster MH, Dixon DC, Carr JP, Dunsmuir P, Klessig DF. Disease response to tobacco mosaic virus in transgenic tobacco plants that constitutively express the pathogenesis-related PR1b gene. Virology 1989; 173:89-97. [PMID: 2815592 DOI: 10.1016/0042-6822(89)90224-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Correlation of the temporal and spacial pattern of induction of the pathogenesis-related (PR) genes PR1a, PR1b, and PR1c with viral infections in certain tobacco cultivars has implicated PR proteins in viral disease resistance. To test whether the PR1 proteins of tobacco are involved in viral resistance, transgenic Nicotiana tabacum plants were constructed which constitutively express the PR1b gene. This protein was secreted from cells of transgenic plants and accumulated in the extracellular space at levels equivalent to those found in nontransgenic plants in association with disease resistance. Transgenic plants derived from the cultivar (cv.) Xanthi (susceptible to tobacco mosaic virus [TMV] infection) exhibited no delayed onset or reduction in the severity of systemic symptoms after TMV infection. In transgenic plants derived from cv. Xanthi-nc (TMV resistant), the time of appearance, the size and general morphology, and the number of viral lesions produced were similar to the parental control plants after TMV infection. These data indicate that the PR1b protein of tobacco is not sufficient for TMV resistance, and imply that the PR1 proteins may not function as unique antiviral factors.
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Affiliation(s)
- J R Cutt
- Waksman Institute at Rutgers, State University of New Jersey, Piscataway 08855
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Abstract
Transgenic tobacco plants constitutively expressing the coat protein (CP) of tobacco mosaic virus (TMV) exhibit enhanced resistance ot TMV (P. Powell Abel, R. S. Nelson, B. De, N. Hoffman, S. G. Rogers, R. T. Fraley, and R. N. Beachy, Science, 232, 738-743, 1986; R. S. Nelson, P. Powell Abel, and R. N. Beachy, Virology 158, 128-132, 1987). To determine if this enhanced resistance might be mediated through the PR1 family of pathogenesis-related (PR) proteins, their synthesis was examined. In transgenic plants derived from NN genotypic tobacco, a high proportion (approximately 80%) of those producing CP also expressed the PR1 genes at low levels. However, this correlation between TMV CP and PR1 gene expression was not observed in similarly transformed nn genotypic tobacco plants. Therefore, it appears unlikely that PR1 proteins play a critical role in genetically engineered resistance in transgenic plants producing TMV CP.
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Affiliation(s)
- J P Carr
- Waksman Institute, Rutgers, State University of New Jersey, Piscataway 08854
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Cutt JR, Dixon DC, Carr JP, Klessig DF. Isolation and nucleotide sequence of cDNA clones for the pathogenesis-related proteins PR1a, PR1b and PR1c of Nicotiana tabacum cv. Xanthi nc induced by TMV infection. Nucleic Acids Res 1988; 16:9861. [PMID: 3186451 PMCID: PMC338789 DOI: 10.1093/nar/16.20.9861] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Affiliation(s)
- J R Cutt
- Waksman Institute, State University of New Jersey, Piscataway 08855
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Abstract
The PR1 family of pathogenesis-related proteins from tobacco (Nicotiana tabacum L.) leaves is induced by a variety of pathogenic and chemical agents and is associated with resistance to tobacco mosaic virus. The majority of the PR1 proteins did not copurify with mesophyll protoplasts (the major cell type of the leaf) isolated from tobacco mosaic virus-infected N. tabacum cv. Xanthi-nc leaves. However, these isolated protoplasts were capable of synthesizing and selectively secreting the PR1 proteins. Using monoclonal antibodies for immunofluorescence microscopy, we localized these proteins to the extracellular spaces predominantly in regions adjacent to viral lesions as well as in xylem elements of infected leaves.
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Berry JO, Nikolau BJ, Carr JP, Klessig DF. Translational regulation of light-induced ribulose 1,5-bisphosphate carboxylase gene expression in amaranth. Mol Cell Biol 1986; 6:2347-53. [PMID: 3785198 PMCID: PMC367787 DOI: 10.1128/mcb.6.7.2347-2353.1986] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The regulation of the genes encoding the large and small subunits of ribulose 1,5-bisphosphate carboxylase was examined in amaranth cotyledons in response to changes in illumination. When dark-grown cotyledons were transferred into light, synthesis of the large- and small-subunit polypeptides was initiated very rapidly, before any increase in the levels of their corresponding mRNAs. Similarly, when light-grown cotyledons were transferred to total darkness, synthesis of the large- and small-subunit proteins was rapidly depressed without changes in mRNA levels for either subunit. In vitro translation or in vivo pulse-chase experiments indicated that these apparent changes in protein synthesis were not due to alterations in the functionality of the mRNAs or to protein turnover, respectively. These results, in combination with our previous studies, suggest that the expression of ribulose 1,5-bisphosphate carboxylase genes can be adjusted rapidly at the translational level and over a longer period through changes in mRNA accumulation.
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Berry JO, Nikolau BJ, Carr JP, Klessig DF. Transcriptional and post-transcriptional regulation of ribulose 1,5-bisphosphate carboxylase gene expression in light- and dark-grown amaranth cotyledons. Mol Cell Biol 1985; 5:2238-46. [PMID: 3837189 PMCID: PMC366949 DOI: 10.1128/mcb.5.9.2238-2246.1985] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
The regulation of expression of the genes encoding the large subunit (LSU) and small subunit (SSU) of ribulose 1,5-bisphosphate carboxylase (RuBPCase) was examined in 1- through 8-day-old, dark-grown (etiolated) and light-grown amaranth cotyledons. RuBPCase specific activity in light-grown cotyledons increased during this 8-day period to a level 15-fold higher than in dark-grown cotyledons. Under both growth conditions, the accumulation of the LSU and SSU polypeptides was not coordinated. Initial detection of the SSU occurred 1 and 2 days after the appearance of the LSU in light- and dark-grown cotyledons, respectively. Furthermore, although the levels of the LSU were similar in both light- and dark-grown seedlings, the amount of the SSU followed clearly the changes in enzyme activity. Synthesis of these two polypeptides was dramatically different in etiolated versus light-grown cotyledons. In light the synthesis of both subunits was first observed on day 2 and continued throughout the growth of the cotyledons. In darkness the rate of synthesis of both subunits was much lower than in light and occurred only as a burst between days 2 and 5 after planting. However, mRNAs for both subunits were present in etiolated cotyledons at similar levels on days 4 through 7 (by Northern analysis) and were functional in vitro, despite their apparent inactivity in vivo after day 5. In addition, since both LSU and SSU mRNA levels were lower in dark- than in light-grown seedlings, our results indicate that both transcriptional and post-transcriptional controls modulate RuBPCase production in developing amaranth cotyledons.
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Renfree MB, Holt AB, Green SW, Carr JP, Cheek DB. Ontogeny of the brain in a marsupial (Macropus eugenii) throughout pouch life. I. Brain growth. Brain Behav Evol 1982; 20:57-71. [PMID: 7104670 DOI: 10.1159/000121581] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Growth characteristics of the tammar wallaby brain have been determined from 143 animals at various stages of growth from birth to adulthood, with particular emphasis on the 250 days of pouch life. The macroscopic anatomy of the brain is also described for pouch young at days 3, 5, 88 and 190 days after birth, and for the adult. The transition from the rapid to mature growth phases of each brain structure occurs between days 120 and 180 after birth, and coincides with the appearance of previously described developmental characters or behaviour. The allometric relationships of brain and body growth described in this marsupial resemble those described for primates. Because of the accessibility of the pouch young during the critical period of brain differentiation, this marsupial may provide a useful laboratory model for the study of brain development.
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