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Vuono R, Kouli A, Legault EM, Chagnon L, Allinson KS, La Spada A, Biunno I, Barker RA, Drouin‐Ouellet J. Association Between Toll-Like Receptor 4 (TLR4) and Triggering Receptor Expressed on Myeloid Cells 2 (TREM2) Genetic Variants and Clinical Progression of Huntington's Disease. Mov Disord 2020; 35:401-408. [PMID: 31724242 PMCID: PMC7154663 DOI: 10.1002/mds.27911] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 07/31/2019] [Accepted: 09/09/2019] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Although Huntington's disease (HD) is caused by a single dominant gene, it is clear that there are genetic modifiers that may influence the age of onset and disease progression. OBJECTIVES We sought to investigate whether new inflammation-related genetic variants may contribute to the onset and progression of HD. METHODS We first used postmortem brain material from patients at different stages of HD to look at the protein expression of toll-like receptor 4 (TLR4) and triggering receptor expressed on myeloid cells 2 (TREM2). We then genotyped the TREM2 R47H gene variant and 3 TLR4 single nucleotide polymorphisms in a large cohort of HD patients from the European Huntington's Disease Network REGISTRY. RESULTS We found an increase in the number of cells expressing TREM2 and TLR4 in postmortem brain samples from patients dying with HD. We also found that the TREM2 R47H gene variant was associated with changes in cognitive decline in the large cohort of HD patients, whereas 2 of 3 TLR4 single nucleotide polymorphisms assessed were associated with changes in motor progression in this same group. CONCLUSIONS These findings identify TREM2 and TLR4 as potential genetic modifiers for HD and suggest that inflammation influences disease progression in this condition. © 2019 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Romina Vuono
- John van Geest Centre for Brain Repair & Department of Neurology, Department of Clinical NeurosciencesUniversity of CambridgeCambridgeUnited Kingdom
- Medway School of PharmacyUniversity of Kent at MedwayKentUnited Kingdom
| | - Antonina Kouli
- John van Geest Centre for Brain Repair & Department of Neurology, Department of Clinical NeurosciencesUniversity of CambridgeCambridgeUnited Kingdom
| | | | | | - Kieren S. Allinson
- Department of PathologyCambridge University Hospitals NHS (National Health Service) Foundation TrustCambridgeUnited Kingdom
| | | | | | - Ida Biunno
- Institute for Genetic and Biomedical Research ‐ CNRMilanoItaly
| | - Roger A. Barker
- John van Geest Centre for Brain Repair & Department of Neurology, Department of Clinical NeurosciencesUniversity of CambridgeCambridgeUnited Kingdom
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Wilken S, Choi CJ, Worden AZ. Contrasting Mixotrophic Lifestyles Reveal Different Ecological Niches in Two Closely Related Marine Protists. J Phycol 2020; 56:52-67. [PMID: 31529498 PMCID: PMC7065223 DOI: 10.1111/jpy.12920] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [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: 02/14/2019] [Accepted: 08/13/2019] [Indexed: 05/13/2023]
Abstract
Many marine microbial eukaryotes combine photosynthetic with phagotrophic nutrition, but incomplete understanding of such mixotrophic protists, their functional diversity, and underlying physiological mechanisms limits the assessment and modeling of their roles in present and future ocean ecosystems. We developed an experimental system to study responses of mixotrophic protists to availability of living prey and light, and used it to characterize contrasting physiological strategies in two stramenopiles in the genus Ochromonas. We show that oceanic isolate CCMP1393 is an obligate mixotroph, requiring both light and prey as complementary resources. Interdependence of photosynthesis and heterotrophy in CCMP1393 comprises a significant role of mitochondrial respiration in photosynthetic electron transport. In contrast, coastal isolate CCMP2951 is a facultative mixotroph that can substitute photosynthesis by phagotrophy and hence grow purely heterotrophically in darkness. In contrast to CCMP1393, CCMP2951 also exhibits a marked photoprotection response that integrates non-photochemical quenching and mitochondrial respiration as electron sink for photosynthetically produced reducing equivalents. Facultative mixotrophs similar to CCMP2951 might be well adapted to variable environments, while obligate mixotrophs similar to CCMP1393 appear capable of resource efficient growth in oligotrophic ocean environments. Thus, the responses of these phylogenetically close protists to the availability of different resources reveals niche differentiation that influences impacts in food webs and leads to opposing carbon cycle roles.
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Affiliation(s)
- Susanne Wilken
- Monterey Bay Aquarium Research Institute7700 Sandholdt RoadMoss LandingCalifornia95039USA
- Department of Freshwater and Marine EcologyInstitute for Biodiversity and Ecosystem DynamicsUniversity of AmsterdamScience Park 904Amsterdam1098 XHThe Netherlands
| | - Chang Jae Choi
- Monterey Bay Aquarium Research Institute7700 Sandholdt RoadMoss LandingCalifornia95039USA
- Ocean EcoSystems Biology UnitGEOMAR Helmholtz Centre for Ocean ResearchDüsternbrooker Weg 20Kiel24105Germany
| | - Alexandra Z. Worden
- Monterey Bay Aquarium Research Institute7700 Sandholdt RoadMoss LandingCalifornia95039USA
- Ocean EcoSystems Biology UnitGEOMAR Helmholtz Centre for Ocean ResearchDüsternbrooker Weg 20Kiel24105Germany
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3
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Johnson MO, Galbraith D, Gloor M, De Deurwaerder H, Guimberteau M, Rammig A, Thonicke K, Verbeeck H, von Randow C, Monteagudo A, Phillips OL, Brienen RJW, Feldpausch TR, Lopez Gonzalez G, Fauset S, Quesada CA, Christoffersen B, Ciais P, Sampaio G, Kruijt B, Meir P, Moorcroft P, Zhang K, Alvarez‐Davila E, Alves de Oliveira A, Amaral I, Andrade A, Aragao LEOC, Araujo‐Murakami A, Arets EJMM, Arroyo L, Aymard GA, Baraloto C, Barroso J, Bonal D, Boot R, Camargo J, Chave J, Cogollo A, Cornejo Valverde F, Lola da Costa AC, Di Fiore A, Ferreira L, Higuchi N, Honorio EN, Killeen TJ, Laurance SG, Laurance WF, Licona J, Lovejoy T, Malhi Y, Marimon B, Marimon BH, Matos DCL, Mendoza C, Neill DA, Pardo G, Peña‐Claros M, Pitman NCA, Poorter L, Prieto A, Ramirez‐Angulo H, Roopsind A, Rudas A, Salomao RP, Silveira M, Stropp J, ter Steege H, Terborgh J, Thomas R, Toledo M, Torres‐Lezama A, van der Heijden GMF, Vasquez R, Guimarães Vieira IC, Vilanova E, Vos VA, Baker TR. Variation in stem mortality rates determines patterns of above-ground biomass in Amazonian forests: implications for dynamic global vegetation models. Glob Chang Biol 2016; 22:3996-4013. [PMID: 27082541 PMCID: PMC6849555 DOI: 10.1111/gcb.13315] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [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: 10/03/2015] [Revised: 02/05/2016] [Accepted: 03/01/2016] [Indexed: 05/05/2023]
Abstract
Understanding the processes that determine above-ground biomass (AGB) in Amazonian forests is important for predicting the sensitivity of these ecosystems to environmental change and for designing and evaluating dynamic global vegetation models (DGVMs). AGB is determined by inputs from woody productivity [woody net primary productivity (NPP)] and the rate at which carbon is lost through tree mortality. Here, we test whether two direct metrics of tree mortality (the absolute rate of woody biomass loss and the rate of stem mortality) and/or woody NPP, control variation in AGB among 167 plots in intact forest across Amazonia. We then compare these relationships and the observed variation in AGB and woody NPP with the predictions of four DGVMs. The observations show that stem mortality rates, rather than absolute rates of woody biomass loss, are the most important predictor of AGB, which is consistent with the importance of stand size structure for determining spatial variation in AGB. The relationship between stem mortality rates and AGB varies among different regions of Amazonia, indicating that variation in wood density and height/diameter relationships also influences AGB. In contrast to previous findings, we find that woody NPP is not correlated with stem mortality rates and is weakly positively correlated with AGB. Across the four models, basin-wide average AGB is similar to the mean of the observations. However, the models consistently overestimate woody NPP and poorly represent the spatial patterns of both AGB and woody NPP estimated using plot data. In marked contrast to the observations, DGVMs typically show strong positive relationships between woody NPP and AGB. Resolving these differences will require incorporating forest size structure, mechanistic models of stem mortality and variation in functional composition in DGVMs.
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Affiliation(s)
| | | | - Manuel Gloor
- School of GeographyUniversity of LeedsLeedsLS6 2QTUK
| | - Hannes De Deurwaerder
- CAVElab Computational & Applied Vegetation EcologyFaculty of Bioscience EngineeringGhent UniversityCoupure Links 653B‐9000GentBelgium
| | - Matthieu Guimberteau
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA‐CNRS‐UVSQUniversité Paris‐SaclayF‐91191Gif‐sur‐YvetteFrance
- UMR 7619 METISIPSL, Sorbonne Universités, UPMC, CNRS, EPHE75252ParisFrance
| | - Anja Rammig
- TUM School of Life Sciences WeihenstephanTechnical University MunichHans‐Carl‐von‐Carlowitz‐Platz 285354FreisingGermany
- Potsdam Institute for Climate Impact Research (PIK)Telegrafenberg A62PO Box 60 12 03D‐14412PotsdamGermany
| | - Kirsten Thonicke
- Potsdam Institute for Climate Impact Research (PIK)Telegrafenberg A62PO Box 60 12 03D‐14412PotsdamGermany
| | - Hans Verbeeck
- CAVElab Computational & Applied Vegetation EcologyFaculty of Bioscience EngineeringGhent UniversityCoupure Links 653B‐9000GentBelgium
| | - Celso von Randow
- INPEAv. Dos Astronautas, 1.758, Jd. GranjaCEP: 12227‐010Sao Jose dos CamposSPBrazil
| | - Abel Monteagudo
- Jardín Botánico de MissouriProlongacion Bolognesi Mz.e, Lote 6Oxapampa, PascoPeru
| | | | | | - Ted R. Feldpausch
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterRennes DriveExeterEX4 4RJUK
| | | | - Sophie Fauset
- School of GeographyUniversity of LeedsLeedsLS6 2QTUK
| | | | - Bradley Christoffersen
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3FFUK
- Earth and Environmental Sciences DivisionLos Alamos National LaboratoryPO Box 1663Los AlamosNM 87545USA
| | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA‐CNRS‐UVSQUniversité Paris‐SaclayF‐91191Gif‐sur‐YvetteFrance
| | - Gilvan Sampaio
- INPEAv. Dos Astronautas, 1.758, Jd. GranjaCEP: 12227‐010Sao Jose dos CamposSPBrazil
| | - Bart Kruijt
- ALTERRAWageningen‐URPO Box 476700 AAWageningenThe Netherlands
| | - Patrick Meir
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3FFUK
- Research School of BiologyAustralian National UniversityCanberraACT0200Australia
| | - Paul Moorcroft
- Department of Organismic and Evolutionary BiologyHarvard University26 Oxford StreetCambridgeMA 02138USA
| | - Ke Zhang
- Cooperative Institute for Mesoscale Meteorological StudiesUniversity of Oklahoma National Weather Center Suite 2100120 David L. Boren BlvdNormanOK73072USA
| | | | | | - Ieda Amaral
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Ana Andrade
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Luiz E. O. C. Aragao
- Jardín Botánico de MissouriProlongacion Bolognesi Mz.e, Lote 6Oxapampa, PascoPeru
| | - Alejandro Araujo‐Murakami
- Museo de Historia Natural Noel Kempff MercadoUniversidad Autonoma Gabriel Rene MorenoCasilla 2489, Av. Irala 565Santa CruzBolivia
| | | | - Luzmila Arroyo
- Museo de Historia Natural Noel Kempff MercadoUniversidad Autonoma Gabriel Rene MorenoCasilla 2489, Av. Irala 565Santa CruzBolivia
| | - Gerardo A. Aymard
- UNELLEZ‐Guanare, Programa de Ciencias del Agro y el Mar, Herbario Universitario (PORT)Mesa de CavacasEstado Portuguesa3350Venezuela
| | - Christopher Baraloto
- Department of Biological SciencesInternational Center for Tropical Botany (ICTB)Florida International University112200 SW 8th Street, OE 167MiamiFL33199USA
| | - Jocely Barroso
- Universidade Federal do AcreCampus de Cruzeiro do SulRio BrancoBrazil
| | - Damien Bonal
- INRAUMR 1137 “Ecologie et Ecophysiologie Forestiere”54280ChampenouxFrance
| | - Rene Boot
- Tropenbos InternationalPO Box 2326700 AEWageningenThe Netherlands
| | - Jose Camargo
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Jerome Chave
- Université Paul Sabatier CNRSUMR 5174 Evolution et Diversité Biologiquebâtiment 4R131062ToulouseFrance
| | - Alvaro Cogollo
- Jardín Botánico de Medellín Joaquín Antonio Uribe Calle 73 # 51 D 14 MedellínCartagenaColombia
| | | | | | - Anthony Di Fiore
- Department of AnthropologyUniversity of Texas at AustinSAC Room 5.1502201 Speedway Stop C3200AustinTX78712USA
| | - Leandro Ferreira
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376 ‐ São BrazCEP: 66040‐170BelémPABrazil
| | - Niro Higuchi
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Euridice N. Honorio
- Instituto de Investigaciones de la Amazonía PeruanaAv. José Quiñones km 2.5IquitosPerú
| | | | - Susan G. Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental SciencesJames Cook UniversityCairnsQld4878Australia
| | - William F. Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental SciencesJames Cook UniversityCairnsQld4878Australia
| | - Juan Licona
- Instituto Boliviano de Investigación ForestalC.P. 6201Santa Cruz de la SierraBolivia
| | - Thomas Lovejoy
- Environmental Science and Policy Department and the Department of Public and International Affairs at George Mason University (GMU)3351 Fairfax DriveArlingtonWashingtonDCVA 22201USA
| | - Yadvinder Malhi
- Environmental Change InstituteSchool of Geography and the EnvironmentUniversity of OxfordSouth Parks RoadOxfordOX1 3QYUK
| | - Bia Marimon
- Universidade do Estado de Mato GrossoCampus de Nova XavantinaCaixa Postal 08CEP 78.690‐000Nova XavantinaMTBrazil
| | - Ben Hur Marimon
- Universidade do Estado de Mato GrossoCampus de Nova XavantinaCaixa Postal 08CEP 78.690‐000Nova XavantinaMTBrazil
| | - Darley C. L. Matos
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376 ‐ São BrazCEP: 66040‐170BelémPABrazil
| | - Casimiro Mendoza
- Escuela de Ciencias Forestales (ESFOR)Av. Final Atahuallpa s/nCasilla 447CochabambaBolivia
| | - David A. Neill
- Facultad de Ingeniería AmbientalUniversidad Estatal AmazónicaPaso lateral km 2 1/2 via NapoPuyoPastazaEcuador
| | - Guido Pardo
- Universidad Autonoma del BeniCampus UniversitarioAv. Ejército Nacional, finalRiberaltaBeniBolivia
| | - Marielos Peña‐Claros
- Instituto Boliviano de Investigación ForestalC.P. 6201Santa Cruz de la SierraBolivia
- Forest Ecology and Forest Management GroupWageningen UniversityPO Box 47Wageningen6700 AAThe Netherlands
| | - Nigel C. A. Pitman
- Center for Tropical ConservationDuke UniversityBox 90381DurhamNC27708USA
| | - Lourens Poorter
- Forest Ecology and Forest Management GroupWageningen UniversityPO Box 47Wageningen6700 AAThe Netherlands
| | - Adriana Prieto
- Doctorado Instituto de Ciencias NaturalesUniversidad Nacional de ColombiaBogotáColombia
| | - Hirma Ramirez‐Angulo
- Instituto de Investigaciones para el Desarrollo ForestalUniversidad de Los AndesAvenida Principal Chorros de MillaCampus Universitario ForestalEdificio PrincipalMéridaVenezuela
| | - Anand Roopsind
- Iwokrama International Centre for Rainforest Conservation and Development77 High Street KingstonGeorgetownGuyana
| | - Agustin Rudas
- Doctorado Instituto de Ciencias NaturalesUniversidad Nacional de ColombiaBogotáColombia
| | - Rafael P. Salomao
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376 ‐ São BrazCEP: 66040‐170BelémPABrazil
| | - Marcos Silveira
- Museu UniversitárioUniversidade Federal do AcreRio BrancoAC69910‐900Brazil
| | - Juliana Stropp
- Institute of Biological and Health SciencesFederal University of AlagoasAv. Lourival Melo Mota s/nTabuleiro do Martins, MaceióAL 57072‐900Brazil
| | - Hans ter Steege
- Naturalis Biodiversity CenterPO Box 95172300 RALeidenThe Netherlands
| | - John Terborgh
- Center for Tropical ConservationDuke UniversityBox 90381DurhamNC27708USA
| | - Raquel Thomas
- Iwokrama International Centre for Rainforest Conservation and Development77 High Street KingstonGeorgetownGuyana
| | - Marisol Toledo
- Instituto Boliviano de Investigación ForestalC.P. 6201Santa Cruz de la SierraBolivia
| | - Armando Torres‐Lezama
- Instituto de Investigaciones para el Desarrollo ForestalUniversidad de Los AndesAvenida Principal Chorros de MillaCampus Universitario ForestalEdificio PrincipalMéridaVenezuela
| | | | - Rodolfo Vasquez
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterRennes DriveExeterEX4 4RJUK
| | | | - Emilio Vilanova
- Instituto de Investigaciones para el Desarrollo ForestalUniversidad de Los AndesAvenida Principal Chorros de MillaCampus Universitario ForestalEdificio PrincipalMéridaVenezuela
| | - Vincent A. Vos
- Centro de Investigación y Promoción del Campesinado, regional Norte AmazónicoC/Nicanor Gonzalo Salvatierra N° 362Casilla 16RiberaltaBolivia
- Universidad Autónoma del BeniAvenida 6 de Agosto N° 64RiberaltaBolivia
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