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Jäntti H, Jonk S, Gómez Budia M, Ohtonen S, Fagerlund I, Fazaludeen MF, Aakko-Saksa P, Pebay A, Lehtonen Š, Koistinaho J, Kanninen KM, Jalava PI, Malm T, Korhonen P. Particulate matter from car exhaust alters function of human iPSC-derived microglia. Part Fibre Toxicol 2024; 21:6. [PMID: 38360668 PMCID: PMC10870637 DOI: 10.1186/s12989-024-00564-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2023] [Accepted: 01/25/2024] [Indexed: 02/17/2024] Open
Abstract
BACKGROUND Air pollution is recognized as an emerging environmental risk factor for neurological diseases. Large-scale epidemiological studies associate traffic-related particulate matter (PM) with impaired cognitive functions and increased incidence of neurodegenerative diseases such as Alzheimer's disease. Inhaled components of PM may directly invade the brain via the olfactory route, or act through peripheral system responses resulting in inflammation and oxidative stress in the brain. Microglia are the immune cells of the brain implicated in the progression of neurodegenerative diseases. However, it remains unknown how PM affects live human microglia. RESULTS Here we show that two different PMs derived from exhausts of cars running on EN590 diesel or compressed natural gas (CNG) alter the function of human microglia-like cells in vitro. We exposed human induced pluripotent stem cell (iPSC)-derived microglia-like cells (iMGLs) to traffic related PMs and explored their functional responses. Lower concentrations of PMs ranging between 10 and 100 µg ml-1 increased microglial survival whereas higher concentrations became toxic over time. Both tested pollutants impaired microglial phagocytosis and increased secretion of a few proinflammatory cytokines with distinct patterns, compared to lipopolysaccharide induced responses. iMGLs showed pollutant dependent responses to production of reactive oxygen species (ROS) with CNG inducing and EN590 reducing ROS production. CONCLUSIONS Our study indicates that traffic-related air pollutants alter the function of human microglia and warrant further studies to determine whether these changes contribute to adverse effects in the brain and on cognition over time. This study demonstrates human iPSC-microglia as a valuable tool to study functional microglial responses to environmental agents.
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Affiliation(s)
- Henna Jäntti
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
- F.M. Kirby Neurobiology Center, Boston Children's Hospital, Boston, MA, USA
- Stanley Center for Psychiatric Research, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Steffi Jonk
- Division of Eye and Vision, Department of Clinical Neuroscience, St. Erik Eye Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Mireia Gómez Budia
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Sohvi Ohtonen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Ilkka Fagerlund
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | | | | | - Alice Pebay
- Department of Surgery, Royal Melbourne Hospital, The University of Melbourne, Melbourne, VIC, 3010, Australia
- Department of Anatomy and Neuroscience, The University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Šárka Lehtonen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Jari Koistinaho
- Neuroscience Center, University of Helsinki, Helsinki, Finland
| | - Katja M Kanninen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Pasi I Jalava
- Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland
| | - Tarja Malm
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland.
| | - Paula Korhonen
- A.I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland.
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2
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Lorenzini I, Alsop E, Levy J, Gittings LM, Lall D, Rabichow BE, Moore S, Pevey R, Bustos LM, Burciu C, Bhatia D, Singer M, Saul J, McQuade A, Tzioras M, Mota TA, Logemann A, Rose J, Almeida S, Gao FB, Marks M, Donnelly CJ, Hutchins E, Hung ST, Ichida J, Bowser R, Spires-Jones T, Blurton-Jones M, Gendron TF, Baloh RH, Van Keuren-Jensen K, Sattler R. Moderate intrinsic phenotypic alterations in C9orf72 ALS/FTD iPSC-microglia despite the presence of C9orf72 pathological features. Front Cell Neurosci 2023; 17:1179796. [PMID: 37346371 PMCID: PMC10279871 DOI: 10.3389/fncel.2023.1179796] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Accepted: 05/05/2023] [Indexed: 06/23/2023] Open
Abstract
While motor and cortical neurons are affected in C9orf72 amyotrophic lateral sclerosis and frontotemporal dementia (ALS/FTD), it remains largely unknown if and how non-neuronal cells induce or exacerbate neuronal damage. We differentiated C9orf72 ALS/FTD patient-derived induced pluripotent stem cells into microglia (iPSC-MG) and examined their intrinsic phenotypes. Similar to iPSC motor neurons, C9orf72 ALS/FTD iPSC-MG mono-cultures form G4C2 repeat RNA foci, exhibit reduced C9orf72 protein levels, and generate dipeptide repeat proteins. Healthy control and C9orf72 ALS/FTD iPSC-MG equally express microglial specific genes and perform microglial functions, including inflammatory cytokine release and phagocytosis of extracellular cargos, such as synthetic amyloid beta peptides and healthy human brain synaptoneurosomes. RNA sequencing analysis revealed select transcriptional changes of genes associated with neuroinflammation or neurodegeneration in diseased microglia yet no significant differentially expressed microglial-enriched genes. Moderate molecular and functional differences were observed in C9orf72 iPSC-MG mono-cultures despite the presence of C9orf72 pathological features suggesting that a diseased microenvironment may be required to induce phenotypic changes in microglial cells and the associated neuronal dysfunction seen in C9orf72 ALS/FTD neurodegeneration.
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Affiliation(s)
- Ileana Lorenzini
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Eric Alsop
- Neurogenomics Division, Translational Genomics Research Institute, Phoenix, AZ, United States
| | - Jennifer Levy
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Lauren M. Gittings
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Deepti Lall
- Center for Neural Science and Medicine, Cedars-Sinai Medical Center, Regenerative Medicine Institute, Los Angeles, CA, United States
| | - Benjamin E. Rabichow
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Stephen Moore
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Ryan Pevey
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Lynette M. Bustos
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
- School of Life Sciences, Arizona State University, Tempe, AZ, United States
| | - Camelia Burciu
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Divya Bhatia
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Mo Singer
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Justin Saul
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Amanda McQuade
- Department of Neurobiology and Behavior, University of California, Irvine, Irvine, CA, United States
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA, United States
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, Irvine, CA, United States
| | - Makis Tzioras
- UK Dementia Research Institute, The University of Edinburgh, Edinburgh, United Kingdom
- Centre for Brain Discovery Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Thomas A. Mota
- Center for Neural Science and Medicine, Cedars-Sinai Medical Center, Regenerative Medicine Institute, Los Angeles, CA, United States
| | - Amber Logemann
- Neurogenomics Division, Translational Genomics Research Institute, Phoenix, AZ, United States
| | - Jamie Rose
- UK Dementia Research Institute, The University of Edinburgh, Edinburgh, United Kingdom
- Centre for Brain Discovery Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Sandra Almeida
- Department of Neurology, University of Massachusetts Medical School, Worcester, MA, United States
| | - Fen-Biao Gao
- Department of Neurology, University of Massachusetts Medical School, Worcester, MA, United States
| | - Michael Marks
- Department of Neurobiology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Christopher J. Donnelly
- Department of Neurobiology, University of Pittsburgh School of Medicine, Pittsburgh, PA, United States
| | - Elizabeth Hutchins
- Neurogenomics Division, Translational Genomics Research Institute, Phoenix, AZ, United States
| | - Shu-Ting Hung
- Department of Stem Cell Biology Regenerative Medicine, USC Keck School of Medicine, Los Angeles, CA, United States
| | - Justin Ichida
- Department of Stem Cell Biology Regenerative Medicine, USC Keck School of Medicine, Los Angeles, CA, United States
| | - Robert Bowser
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
| | - Tara Spires-Jones
- UK Dementia Research Institute, The University of Edinburgh, Edinburgh, United Kingdom
- Centre for Brain Discovery Sciences, The University of Edinburgh, Edinburgh, United Kingdom
| | - Mathew Blurton-Jones
- Department of Neurobiology and Behavior, University of California, Irvine, Irvine, CA, United States
- Sue and Bill Gross Stem Cell Research Center, University of California, Irvine, Irvine, CA, United States
- Institute for Memory Impairments and Neurological Disorders, University of California, Irvine, Irvine, CA, United States
| | - Tania F. Gendron
- Department of Neuroscience, Mayo Clinic, Jacksonville, FL, United States
- Mayo Clinic Graduate School of Biomedical Sciences, Mayo Clinic, Jacksonville, FL, United States
| | - Robert H. Baloh
- Center for Neural Science and Medicine, Cedars-Sinai Medical Center, Regenerative Medicine Institute, Los Angeles, CA, United States
- Department of Neurology, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | | | - Rita Sattler
- Department of Translational Neuroscience, Barrow Neurological Institute, Phoenix, AZ, United States
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Monzón-Sandoval J, Burlacu E, Agarwal D, Handel AE, Wei L, Davis J, Cowley SA, Cader MZ, Webber C. Lipopolysaccharide distinctively alters human microglia transcriptomes to resemble microglia from Alzheimer's disease mouse models. Dis Model Mech 2022; 15:277958. [PMID: 36254682 PMCID: PMC9612871 DOI: 10.1242/dmm.049349] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 08/30/2022] [Indexed: 01/15/2023] Open
Abstract
Alzheimer's disease (AD) is the most common form of dementia, and risk-influencing genetics implicates microglia and neuroimmunity in the pathogenesis of AD. Induced pluripotent stem cell (iPSC)-derived microglia (iPSC-microglia) are increasingly used as a model of AD, but the relevance of historical immune stimuli to model AD is unclear. We performed a detailed cross-comparison over time on the effects of combinatory stimulation of iPSC-microglia, and in particular their relevance to AD. We used single-cell RNA sequencing to measure the transcriptional response of iPSC-microglia after 24 h and 48 h of stimulation with prostaglandin E2 (PGE2) or lipopolysaccharide (LPS)+interferon gamma (IFN-γ), either alone or in combination with ATPγS. We observed a shared core transcriptional response of iPSC-microglia to ATPγS and to LPS+IFN-γ, suggestive of a convergent mechanism of action. Across all conditions, we observed a significant overlap, although directional inconsistency to genes that change their expression levels in human microglia from AD patients. Using a data-led approach, we identify a common axis of transcriptomic change across AD genetic mouse models of microglia and show that only LPS provokes a transcriptional response along this axis in mouse microglia and LPS+IFN-γ in human iPSC-microglia. This article has an associated First Person interview with the first author of the paper.
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Affiliation(s)
| | - Elena Burlacu
- John Radcliffe Hospital, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford OX3 9DS, UK
| | - Devika Agarwal
- Nuffield Department of Medicine Research Building, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford OX3 7FZ, UK.,Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK
| | - Adam E Handel
- John Radcliffe Hospital, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford OX3 9DS, UK
| | - Liting Wei
- James Martin Stem Cell Facility, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| | - John Davis
- Nuffield Department of Medicine Research Building, Alzheimer's Research UK Oxford Drug Discovery Institute, University of Oxford, Oxford OX3 7FZ, UK
| | - Sally A Cowley
- Translational Molecular Neuroscience Group, New Biochemistry Building, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford OX1 3QU, UK
| | - M Zameel Cader
- John Radcliffe Hospital, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford OX3 9DS, UK.,James Martin Stem Cell Facility, Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| | - Caleb Webber
- UK Dementia Research Institute, Cardiff University, Cardiff CF24 4HQ, UK
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4
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Kiani Shabestari S, Morabito S, Danhash EP, McQuade A, Sanchez JR, Miyoshi E, Chadarevian JP, Claes C, Coburn MA, Hasselmann J, Hidalgo J, Tran KN, Martini AC, Chang Rothermich W, Pascual J, Head E, Hume DA, Pridans C, Davtyan H, Swarup V, Blurton-Jones M. Absence of microglia promotes diverse pathologies and early lethality in Alzheimer's disease mice. Cell Rep 2022; 39:110961. [PMID: 35705056 PMCID: PMC9285116 DOI: 10.1016/j.celrep.2022.110961] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [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: 11/02/2021] [Revised: 04/13/2022] [Accepted: 05/24/2022] [Indexed: 11/03/2022] Open
Abstract
Microglia are strongly implicated in the development and progression of Alzheimer's disease (AD), yet their impact on pathology and lifespan remains unclear. Here we utilize a CSF1R hypomorphic mouse to generate a model of AD that genetically lacks microglia. The resulting microglial-deficient mice exhibit a profound shift from parenchymal amyloid plaques to cerebral amyloid angiopathy (CAA), which is accompanied by numerous transcriptional changes, greatly increased brain calcification and hemorrhages, and premature lethality. Remarkably, a single injection of wild-type microglia into adult mice repopulates the microglial niche and prevents each of these pathological changes. Taken together, these results indicate the protective functions of microglia in reducing CAA, blood-brain barrier dysfunction, and brain calcification. To further understand the clinical implications of these findings, human AD tissue and iPSC-microglia were examined, providing evidence that microglia phagocytose calcium crystals, and this process is impaired by loss of the AD risk gene, TREM2.
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Affiliation(s)
- Sepideh Kiani Shabestari
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Samuel Morabito
- Mathematical, Computational and System Biology (MCSB) Program, UC Irvine, Irvine, CA 92697, USA; Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA
| | - Emma Pascal Danhash
- Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Amanda McQuade
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA; Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA
| | - Jessica Ramirez Sanchez
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Emily Miyoshi
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA
| | - Jean Paul Chadarevian
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Christel Claes
- Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA; Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA
| | - Morgan Alexandra Coburn
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Jonathan Hasselmann
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Jorge Hidalgo
- Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Kayla Nhi Tran
- Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA
| | - Alessandra C Martini
- Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA; Department of Pathology & Laboratory Medicine, UC Irvine, Irvine, CA 92697, USA
| | | | - Jesse Pascual
- Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA; Department of Pathology & Laboratory Medicine, UC Irvine, Irvine, CA 92697, USA
| | - Elizabeth Head
- Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA; Department of Pathology & Laboratory Medicine, UC Irvine, Irvine, CA 92697, USA
| | - David A Hume
- Mater Research Institute-University of Queensland, Brisbane, Australia
| | - Clare Pridans
- University of Edinburgh Centre for Inflammation Research, Edinburgh, UK; Simons Initiative for the Developing Brain Centre, University of Edinburgh, Edinburgh, UK; The Muir Maxwell Epilepsy Centre, University of Edinburgh, Edinburgh, UK
| | - Hayk Davtyan
- Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA; Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA
| | - Vivek Swarup
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA
| | - Mathew Blurton-Jones
- Department of Neurobiology & Behavior, UC Irvine, Irvine, CA 92697, USA; Sue and Bill Gross Stem Cell Research Center, UC Irvine, Irvine, CA 92697, USA; Institute for Memory Impairments and Neurological Disorders, UC Irvine, Irvine, CA 92697, USA.
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5
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Brownjohn PW, Smith J, Solanki R, Lohmann E, Houlden H, Hardy J, Dietmann S, Livesey FJ. Functional Studies of Missense TREM2 Mutations in Human Stem Cell-Derived Microglia. Stem Cell Reports 2018; 10:1294-1307. [PMID: 29606617 PMCID: PMC5998752 DOI: 10.1016/j.stemcr.2018.03.003] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 03/02/2018] [Accepted: 03/05/2018] [Indexed: 01/02/2023] Open
Abstract
The derivation of microglia from human stem cells provides systems for understanding microglial biology and enables functional studies of disease-causing mutations. We describe a robust method for the derivation of human microglia from stem cells, which are phenotypically and functionally comparable with primary microglia. We used stem cell-derived microglia to study the consequences of missense mutations in the microglial-expressed protein triggering receptor expressed on myeloid cells 2 (TREM2), which are causal for frontotemporal dementia-like syndrome and Nasu-Hakola disease. We find that mutant TREM2 accumulates in its immature form, does not undergo typical proteolysis, and is not trafficked to the plasma membrane. However, in the absence of plasma membrane TREM2, microglia differentiate normally, respond to stimulation with lipopolysaccharide, and are phagocytically competent. These data indicate that dementia-associated TREM2 mutations have subtle effects on microglia biology, consistent with the adult onset of disease in individuals with these mutations.
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Affiliation(s)
- Philip W Brownjohn
- The Gurdon Institute, ARUK Stem Cell Research Centre and Department of Biochemistry, University of Cambridge, Cambridge CB2 1QN, UK
| | - James Smith
- The Gurdon Institute, ARUK Stem Cell Research Centre and Department of Biochemistry, University of Cambridge, Cambridge CB2 1QN, UK
| | - Ravi Solanki
- The Gurdon Institute, ARUK Stem Cell Research Centre and Department of Biochemistry, University of Cambridge, Cambridge CB2 1QN, UK
| | - Ebba Lohmann
- Department of Neurodegenerative Diseases, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen 72076, Germany; DZNE, German Center for Neurodegenerative Diseases, Tübingen 72076, Germany
| | - Henry Houlden
- Department of Molecular Neuroscience, UCL Institute of Neurology, Queen Square, London WC1N 3BG, UK
| | - John Hardy
- Department of Molecular Neuroscience, UCL Institute of Neurology, Queen Square, London WC1N 3BG, UK
| | - Sabine Dietmann
- Wellcome Trust Medical Research Council Stem Cell Institute, University of Cambridge, Tennis Court Road, Cambridge CB2 1QR, UK
| | - Frederick J Livesey
- The Gurdon Institute, ARUK Stem Cell Research Centre and Department of Biochemistry, University of Cambridge, Cambridge CB2 1QN, UK.
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