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Nardini C, Moreau JF, Gensous N, Ravaioli F, Garagnani P, Bacalini MG. The epigenetics of inflammaging: The contribution of age-related heterochromatin loss and locus-specific remodelling and the modulation by environmental stimuli. Semin Immunol 2018; 40:49-60. [PMID: 30396810 DOI: 10.1016/j.smim.2018.10.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/12/2018] [Accepted: 10/15/2018] [Indexed: 12/12/2022]
Abstract
A growing amount of evidences indicates that inflammaging - the chronic, low grade inflammation state characteristic of the elderly - is the result of genetic as well as environmental or stochastic factors. Some of these, such as the accumulation of senescent cells that are persistent during aging or accompany its progression, seem to be sufficient to initiate the aging process and to fuel it. Others, like exposure to environmental compounds or infections, are temporary and resolve within a (relatively) short time. In both cases, however, a cellular memory of the event can be established by means of epigenetic modulation of the genome. In this review we will specifically discuss the relationship between epigenetics and inflammaging. In particular, we will show how age-associated epigenetic modifications concerned with heterochromatin loss and gene-specific remodelling, can promote inflammaging. Furthermore, we will recall how the exposure to specific nutritional, environmental and microbial stimuli can affect the rate of inflammaging through epigenetic mechanisms, touching also on the recent insight given by the concept of trained immunity.
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Affiliation(s)
- Christine Nardini
- Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden; CNR IAC "Mauro Picone", Roma, Italy; Personal Genomics S.r.l., Verona, Italy
| | - Jean-Francois Moreau
- University of Bordeaux, CNRS-UMR5164, 146 rue Léo Saignat, 33076 Bordeaux, France; CHU Bordeaux, Place Amélie Raba-Léon, Bordeaux, France
| | - Noémie Gensous
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), University of Bologna, Bologna, Italy
| | - Francesco Ravaioli
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), University of Bologna, Bologna, Italy
| | - Paolo Garagnani
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), University of Bologna, Bologna, Italy; Clinical Chemistry, Department of Laboratory Medicine, Karolinska Institutet at Huddinge University Hospital, Stockholm, Sweden; Laboratory of Cell Biology, Rizzoli Orthopaedic Institute, Bologna, Italy; CNR Institute of Molecular Genetics, Unit of Bologna, Bologna, Italy; Center for Applied Biomedical Research (CRBA), St. Orsola-Malpighi University Hospital, Bologna, Italy.
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203
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Körholz JC, Zocher S, Grzyb AN, Morisse B, Poetzsch A, Ehret F, Schmied C, Kempermann G. Selective increases in inter-individual variability in response to environmental enrichment in female mice. eLife 2018; 7:e35690. [PMID: 30362941 PMCID: PMC6203437 DOI: 10.7554/elife.35690] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 09/14/2018] [Indexed: 11/17/2022] Open
Abstract
One manifestation of individualization is a progressively differential response of individuals to the non-shared components of the same environment. Individualization has practical implications in the clinical setting, where subtle differences between patients are often decisive for the success of an intervention, yet there has been no suitable animal model to study its underlying biological mechanisms. Here we show that enriched environment (ENR) can serve as a model of brain individualization. We kept 40 isogenic female C57BL/6JRj mice for 3 months in ENR and compared these mice to an equally sized group of standard-housed control animals, looking at the effects on a wide range of phenotypes in terms of both means and variances. Although ENR influenced multiple parameters and restructured correlation patterns between them, it only increased differences among individuals in traits related to brain and behavior (adult hippocampal neurogenesis, motor cortex thickness, open field and object exploration), in agreement with the hypothesis of a specific activity-dependent development of brain individuality.
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Affiliation(s)
- Julia C Körholz
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Sara Zocher
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Anna N Grzyb
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Benjamin Morisse
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Alexandra Poetzsch
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Fanny Ehret
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Christopher Schmied
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
| | - Gerd Kempermann
- German Center for Neurodegenerative Diseases (DZNE) DresdenDresdenGermany
- CRTD – Center for Regenerative Therapies DresdenTechnische Universität DresdenDresdenGermany
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204
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Sharma S, Gioia L, Abe B, Holt M, Costanzo A, Kain L, Su A, Teyton L. Using single cell analysis for translational studies in immune mediated diseases: Opportunities and challenges. Mol Immunol 2018; 103:191-199. [PMID: 30300798 DOI: 10.1016/j.molimm.2018.09.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 09/11/2018] [Accepted: 09/27/2018] [Indexed: 12/18/2022]
Abstract
The difficulty of studying small tissue samples and rare cell populations have been some of the main limitations in performing efficient translational studies of immune mediated diseases. Many of these conditions are grouped under the name of a single disease whilst there are strong suggestions that disease heterogeneity leads to variable disease progression as well as therapeutic responses. The recent development of single cell techniques, such as single cell RNA sequencing, gene expression profiling, or multiparametric cytometry, is likely to be a turning point. Single cell approaches provide researchers the opportunity to finally dissect disease pathology at a level that will allow mechanistic classifications and precision therapeutic strategies. In this review, we will give an overview of the current and developing repertoire of single cell techniques, the benefits and limitations of each, and provide an example of how single cell techniques can be utilized to understand complex immune mediated diseases and their translation from mouse to human.
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Affiliation(s)
- Siddhartha Sharma
- Department of Immunology and Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Louis Gioia
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Brian Abe
- Department of Immunology and Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Marie Holt
- Department of Immunology and Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Anne Costanzo
- Department of Immunology and Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Lisa Kain
- Department of Immunology and Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA
| | - Andrew Su
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA, USA
| | - Luc Teyton
- Department of Immunology and Microbiology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA, 92037, USA.
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205
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Cao W, Zheng H. Peripheral immune system in aging and Alzheimer's disease. Mol Neurodegener 2018; 13:51. [PMID: 30285785 PMCID: PMC6169078 DOI: 10.1186/s13024-018-0284-2] [Citation(s) in RCA: 131] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 09/21/2018] [Indexed: 12/13/2022] Open
Abstract
Alzheimer's disease (AD) represents an urgent public health mandate. AD is no longer considered a neural-centric disease; rather, a plethora of recent studies strongly implicate a critical role played by neuroinflammation in the pathogeneses of AD and other neurodegenerative conditions. A close functional connection between the immune system and central nervous system is increasingly recognized. In late-onset AD, aging represents the most significant risk factor. Here, from an immunological perspective, we summarize the prominent molecular and cellular changes in the periphery of aging individuals and AD patients. Moreover, we review the knowledge gained in the past several years that implicate specific arms of the peripheral immune system and other types of immune responses in modulating AD progression. Taken together, these findings collectively emphasize a dynamic role of a concert of brain-extrinsic, peripheral signals in the aging and degenerative processes in the CNS. We believe that a systematic view synthesizing the vast amounts of existing results will help guide the development of next-generation therapeutics and inform future directions of AD investigation.
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Affiliation(s)
- Wei Cao
- Department of Molecular and Human Genetics, Baylor College of Medicine, Huffington Center on Aging, Houston, TX, 77030, USA.
| | - Hui Zheng
- Department of Molecular and Human Genetics, Baylor College of Medicine, Huffington Center on Aging, Houston, TX, 77030, USA.
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206
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Xu SJ, Heller EA. Single sample sequencing (S3EQ) of epigenome and transcriptome in nucleus accumbens. J Neurosci Methods 2018; 308:62-73. [PMID: 30031009 PMCID: PMC6296235 DOI: 10.1016/j.jneumeth.2018.07.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 06/19/2018] [Accepted: 07/06/2018] [Indexed: 12/30/2022]
Abstract
BACKGROUND High-throughput sequencing has been widely applied to uncover the molecular mechanisms underlying neurological and psychiatric disorders. The large body of data support the role of epigenetic mechanisms in neurological function of both human and animals. Yet, the existing data is limited by the fact that epigenetic and transcriptomic changes have only been measured in separate cohorts. This has limited precise correlation of epigenetic changes in gene expression. NEW METHOD Single Sample Sequencing (S3EQ) is an innovative approach to analyze both epigenetic and transcriptomic regulation within a single neuronal sample. Using this method, we analyzed chromatin immunoprecipitation (ChIP)- and RNA-sequencing data from the nucleus accumbens (NAc) of the same animal. RESULTS ChIP-S3EQ of neuronal nuclei reliably identified hPTM enrichment in the adult mouse NAc with high precision. Comparing cellular compartments, we found that the spliceosome of whole cell RNA-seq was more closely recapitulated by cytosolic RNA-S3EQ than nuclear RNA-seq. Finally, S3EQ showed increased sensitivity for correlating chromatin modifications with gene expression, especially for lowly expressed transcripts. COMPARISON WITH EXISTING METHODS S3EQ accurately generates both RNA- and ChIP-seq from a single sample, providing a clear advantage over existing methods which require two samples. ChIP-S3EQ performance was comparable to ChIP-seq, while RNA-S3EQ generated an almost identical expression profile to nuclear-enriched and whole cell RNA-seq. Finally, we directly compared RNA-seq by cellular compartments, addressing a limitation of RNA-seq studies limited to neuronal nuclei. CONCLUSION The S3EQ method can be applied to improve the correlative power of transcriptomic and epigenomic studies in neuronal tissue.
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Affiliation(s)
- S J Xu
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, USA
| | - E A Heller
- Department of Systems Pharmacology and Translational Therapeutics and Penn Epigenetics Institute, Perelman School of Medicine, The University of Pennsylvania, Philadelphia, PA, USA.
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207
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Wagar LE, DiFazio RM, Davis MM. Advanced model systems and tools for basic and translational human immunology. Genome Med 2018; 10:73. [PMID: 30266097 PMCID: PMC6162943 DOI: 10.1186/s13073-018-0584-8] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Accepted: 09/17/2018] [Indexed: 12/31/2022] Open
Abstract
There are fundamental differences between humans and the animals we typically use to study the immune system. We have learned much from genetically manipulated and inbred animal models, but instances in which these findings have been successfully translated to human immunity have been rare. Embracing the genetic and environmental diversity of humans can tell us about the fundamental biology of immune cell types and the elasticity of the immune system. Although people are much more immunologically diverse than conventionally housed animal models, tools and technologies are now available that permit high-throughput analysis of human samples, including both blood and tissues, which will give us deep insights into human immunity in health and disease. As we gain a more detailed picture of the human immune system, we can build more sophisticated models to better reflect this complexity, both enabling the discovery of new immunological mechanisms and facilitating translation into the clinic.
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Affiliation(s)
- Lisa E Wagar
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Robert M DiFazio
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Mark M Davis
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA, 94305, USA.
- Institute for Immunity, Transplantation, and Infection, Stanford University School of Medicine, Stanford, CA, 94305, USA.
- Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA, 94305, USA.
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208
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Radzinski M, Reichmann D. Variety is the spice of life: how to explore a redox-dependent heterogeneity in genomically identical cellular populations. Curr Genet 2018; 65:301-306. [DOI: 10.1007/s00294-018-0878-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Revised: 08/12/2018] [Accepted: 08/12/2018] [Indexed: 11/29/2022]
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209
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Mertz DR, Ahmed T, Takayama S. Engineering cell heterogeneity into organs-on-a-chip. LAB ON A CHIP 2018; 18:2378-2395. [PMID: 30040104 PMCID: PMC6081245 DOI: 10.1039/c8lc00413g] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Organ-on-a-chip development is an application that will benefit from advances in cell heterogeneity characterization because these culture models are intended to mimic in vivo microenvironments, which are complex and dynamic. Due in no small part to advances in microfluidic single cell analysis methods, cell-to-cell variability is an increasingly understood feature of physiological tissues, with cell types from as common as 1 out of every 2 cells to as rare as 1 out of every 100 000 cells having important roles in the biochemical and biological makeup of tissues and organs. Variability between neighboring cells can be transient or maintained, and ordered or stochastic. This review covers three areas of well-studied cell heterogeneity that are informative for organ-on-a-chip development efforts: tumors, the lung, and the intestine. Then we look at how recent single cell analysis strategies have enabled better understanding of heterogeneity within in vitro and in vivo tissues. Finally, we provide a few work-arounds for adapting current on-chip culture methods to better mimic physiological cell heterogeneity including accounting for crucial rare cell types and events.
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Affiliation(s)
- David R Mertz
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Tech College of Engineering and Emory School of Medicine, USA.
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210
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Bland JS. Age as a Modifiable Risk Factor for Chronic Disease. Integr Med (Encinitas) 2018; 17:16-19. [PMID: 31043904 PMCID: PMC6469457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Pieces of the puzzle that is the age-disease interrelationship are starting to come together to form a more complete picture of the processes that power this complex dynamic. It will be very exciting to watch the field move forward and to see the power of this concept-that age is a modifiable risk factor-take root and thrive.
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211
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Kadel S, Kovats S. Sex Hormones Regulate Innate Immune Cells and Promote Sex Differences in Respiratory Virus Infection. Front Immunol 2018; 9:1653. [PMID: 30079065 PMCID: PMC6062604 DOI: 10.3389/fimmu.2018.01653] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/04/2018] [Indexed: 01/27/2023] Open
Abstract
Sex differences in the incidence and severity of respiratory virus infection are widely documented in humans and murine models and correlate with sex biases in numbers and/or functional responses of innate immune cells in homeostasis and lung infection. Similarly, changes in sex hormone levels upon puberty, pregnancy, and menopause/aging are associated with qualitative and quantitative differences in innate immunity. Immune cells express receptors for estrogens (ERα and ERβ), androgens (AR), and progesterone (PR), and experimental manipulation of sex hormone levels or receptors has revealed that sex hormone receptor activity often underlies sex differences in immune cell numbers and/or functional responses in the respiratory tract. While elegant studies have defined mechanistic roles for sex hormones and receptors in innate immune cells, much remains to be learned about the cellular and molecular mechanisms of action of ER, PR, and AR in myeloid cells and innate lymphocytes to promote the initiation and resolution of antiviral immunity in the lung. Here, we review the literature on sex differences and sex hormone regulation in innate immune cells in the lung in homeostasis and upon respiratory virus infection.
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Affiliation(s)
- Sapana Kadel
- Arthritis & Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, United States
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
| | - Susan Kovats
- Arthritis & Clinical Immunology Program, Oklahoma Medical Research Foundation, Oklahoma City, OK, United States
- Department of Microbiology and Immunology, University of Oklahoma Health Sciences Center, Oklahoma City, OK, United States
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212
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Cheung P, Vallania F, Dvorak M, Chang SE, Schaffert S, Donato M, Rao AM, Mao R, Utz PJ, Khatri P, Kuo AJ. Single-cell epigenetics - Chromatin modification atlas unveiled by mass cytometry. Clin Immunol 2018; 196:40-48. [PMID: 29960011 DOI: 10.1016/j.clim.2018.06.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2018] [Revised: 06/21/2018] [Accepted: 06/22/2018] [Indexed: 12/13/2022]
Abstract
Modifications of histone proteins are fundamental to the regulation of epigenetic phenotypes. Dysregulations of histone modifications have been linked to the pathogenesis of diverse human diseases. However, identifying differential histone modifications in patients with immune-mediated diseases has been challenging, in part due to the lack of a powerful analytic platform to study histone modifications in the complex human immune system. We recently developed a highly multiplexed platform, Epigenetic landscape profiling using cytometry by Time-Of-Flight (EpiTOF), to analyze the global levels of a broad array of histone modifications in single cells using mass cytometry. In this review, we summarize the development of EpiTOF and discuss its potential applications in biomedical research. We anticipate that this platform will provide new insights into the roles of epigenetic regulation in hematopoiesis, immune cell functions, and immune system aging, and reveal aberrant epigenetic patterns associated with immune-mediated diseases.
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Affiliation(s)
- Peggie Cheung
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Francesco Vallania
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Mai Dvorak
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Sarah E Chang
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Steven Schaffert
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Michele Donato
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Aditya M Rao
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Rong Mao
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA
| | - Paul J Utz
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA.
| | - Purvesh Khatri
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Biomedical Informatics Research, Stanford University School of Medicine, Stanford, California 94305, USA.
| | - Alex J Kuo
- Institute for Immunity, Transplantation and Infection, Stanford University School of Medicine, Stanford, California 94305, USA; Department of Medicine, Division of Immunology and Rheumatology, Stanford University School of Medicine, Stanford, California 94305, USA.
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213
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Otto G. EpiTOFing ageing. Nat Rev Mol Cell Biol 2018; 19:416-417. [PMID: 29717231 DOI: 10.1038/s41580-018-0026-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Grant Otto
- Nature Reviews Molecular Cell Biology, .
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