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Single-Cell Sequencing of the Healthy and Diseased Heart Reveals Ckap4 As A

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Single-Cell Sequencing of the Healthy and Diseased Heart Reveals Ckap4 As A 10.1161/CIRCULATIONAHA.117.030742 Single-Cell Sequencing of the Healthy and Diseased Heart Reveals Ckap4 as a New Modulator of Fibroblasts Activation Running Title: Gladka et al.; Single-Cell Sequencing of the Adult Heart Monika M. Gladka, PhD1#; Bas Molenaar, MSc1#; Hesther de Ruiter, BS1; Stefan van der Elst, BS1; Hoyee Tsui, PhD1; Danielle Versteeg, BS1,2; Downloaded from Grègory P.A. Lacraz, PhD1; Manon M.H. Huibers, PhD3; Alexander van Oudenaarden, PhD1; Eva van Rooij, PhD1,2* http://circ.ahajournals.org/ http://circ.ahajournals.org/ #These authors contributed equally to this work 1HubrechtHubrechtt IInstitute,nstit tuute, Royal Netherlands AcademAcademyy ofo Arts and ScSciencescieences ((KNAW)KNAW) and UniversitUniversityy 2 by guest on February 6, 2018 by guest on February 6, 2018 MedicalMeM dical Centre,Centree, Utrecht,Uttrecht,, TheThhe NNetherlands;ettheerrlands; DepartmentDeeppartmment ooff CaCardiology,arddiioloogyy, UnUUniversityiverrsis tyy MMedicaleddiccal CeCentre,ntre, UtUtrecht,rrechhtt, TThehhe NNetherlands;ethherlanndsd ; 3DepartmentDDepaartmment ooff PaPathology,thooloogy,y, UUniversityniveverssity MeMedicaldid ccal CCeCentre,ntre, Utrecht,Utrecht The Netherlands *Address for Correspondence: Eva van Rooij, PhD Hubrecht Institute, KNAW Uppsalalaan 8, 3584 CT Utrecht, The Netherlands. Tel: +31 30 2121956 Email: [email protected] 1 10.1161/CIRCULATIONAHA.117.030742 Abstract Background—Genome-wide transcriptome analysis has greatly advanced our understanding of the regulatory networks underlying basic cardiac biology and mechanisms driving disease. However, so far, the resolution of studying gene expression patterns in the adult heart has been limited to the level of extracts from whole tissues. The use of tissue homogenates inherently causes the loss of any information on cellular origin or cell type-specific changes in gene expression. Recent developments in RNA amplification strategies provide a unique opportunity to use small amounts of input RNA for genome-wide sequencing of single cells. Methods—Here, we present a method to obtain high quality RNA from digested cardiac tissue from adult mice for automated single-cell sequencing of both the healthy and diseased heart. Results—After optimization, we were able to perform single-cell sequencing on adult cardiac tissue under both homeostatic conditions and after ischemic injury. Clustering analysis based on differential gene expression unveiled known and novel markers of all main cardiac cell types. Downloaded from Based on differential gene expression we were also able to identify multiple subpopulations within a certain cell type. Furthermore, applying single-cell sequencing on both the healthy and the injured heart indicated the presence of disease-specific cell subpopulations. As such, we identifieddentified cytoskeletoncytoskeleton associated proteinprotein 4 ( Ckap4Ckap4) as a novel marker for activated fiffibroblastsbroblasts thathat positively correlates with known myofibroblastmyofibroblast markersmarkers in bothboth mousemouse andand humanhuman cardiaccardiac http://circ.ahajournals.org/ tissue.issue. Ckap4Ckap4 inhibitioninhibition inin activatedactivated fibroblastsfibroblasts treatetreatedd wiwithth TTGFGFE triggeredtriggered a greatergreaater increaseinncrrease iinn thehe expression of genes related to activated fibroblasts compared to control, suggesting a role of Ckap4Ckap4 inin modulating fibroblast activation in the injured heart.heart. ConclusionsConclusions—Single-cellSinggle-cell sequencing on both the healthy and diseased adult heart allows us to studytudy transcriptomictrraansccrir ptommiic differences between cardiac celceells, as well ass cellcell type-specifictyype-specific changeschanges in genegenen eexpressionxpressioon duringduurir ngn cardiaccara did ac ddisease.isi easee. ThTThisis nnewewe aapproachpprooach prpprovidesovvidese a wwealthealtl h of nnovelovo elel iinsightsnsn igghts by guest on February 6, 2018 intontoo molecularmolecular changeschaanngees tthathat uununderliederliei tthehee cellularlaar prprocessesoocesses rerelevantelleevaannt ffororr ccardiacarrdid ac bbiologyiooloogyy and pathophysiology.pathhoophysiologgyy. ApplyingApA pplyyingg thisthhis technologytechhnon loogy couldcouo ld lleaeaad to thetheh discoverydiscocoveryy ofof newnnew therapeutictherraapeueutic tatargetsrgrget relevantelevaant ffororr hhearteae rt ddisease.iiseasse. Key Words: Adult heart; single-cell sequencing; ischemic injury; myofibroblast; Ckap4 2 10.1161/CIRCULATIONAHA.117.030742 Clinical Perspective What is new? x Single-cell sequencing can be used to identify subpopulation-specific and novel cell type- specific markers in the healthy and diseased heart. x Identification of new disease-driven cell populations provides insights into gene expression changes that are triggered by ischemic injury. x Myozenin2-enriched cardiomyocytes form a distinct subpopulation of cardiomyocytes in the healthy heart. x CKAP4 is a novel marker for activated fibroblasts that positively correlates with known Downloaded from myofibroblast markers in both murine and human diseased hearts. x In vitro experimentsp suggestgg a modulatingg function for CKAP4 in myofibroblasty http://circ.ahajournals.org/ aactivation.ctivation. WWhathat areare ththee cclinicallinical iimplications?mplications? x SiSSingle-cellngglel -cec lll sequencingssequencing of the adult heart alallowsllows us to exaexaminemim ne mmolecularolecular mechanisms ththata by guest on February 6, 2018 drive ththehe ccellularelllularr pprocessesroceessses uunderlyingndndeerlying hheheartart didisease.iseeaase.e x NewNew bbiologyioolol gyg ddidiscoveredscs ovverred bbyy s single-cellinglle-celll ssequencieqquuencinngg cancac n ultimatelyulttimmateely leadleead to thetheh developmentdevelopmem n of novelnovele ttherapeuticheh rapepeutic strategies.stratege iei s. x We identified CKAP4 as a new marker for activated cardiac fibroblasts during ischemic injury that appears to attenuate myofibroblast activation. 3 10.1161/CIRCULATIONAHA.117.030742 Introduction The heart consists of a collection of different cell types that coordinately regulate cardiac function 1. Changes in cellular composition and function are mechanistically responsible for cardiac remodeling and repair during disease. Identifying the underlying differences in gene expression between cell types or transcriptome heterogeneity across cells of the same type will greatly help to improve our understanding of cellular changes under both healthy and diseased conditions 2. RNA amplification strategies have provided the opportunity to use small amounts Downloaded from of input RNA for genome-wide gene expression analysis at single cell resolution. The analysis of individual cells randomly drawn from a sample allows for an unbiased view of all mRNAs presentpresent in different cell types of an organ,organ, whichwill provide a more accurate cclassificationlaassificatioi n ooff http://circ.ahajournals.org/ cellularcellular diversity ththroughrough differences in ggeneene expressioexpressionn 2-52-5. Recently,Recently, transcriptional profiling ooff cardiaccardiac cell populations during heart development by single-cellsingle-cell sequencing has led to the identificationdenntifif cation ofof lilineage-specificinen agge-speccifici ggeneene prprogrrograamsmsms tthathat underlieunnded rliee earlyearlyly cardiaccardid ac ddevelopmenteve elopo meent 4, 6. by guest on February 6, 2018 HHowever,oweever, so fafar,rr, nnoo ststudiestuudies hhahaveve ffocusedocused on sisinginnglle-celle-ceelll ttranscriptomicsrar nsnsccriptotomics ooff tththee adadultullt heheart.eaart. HeHerere wewe presentpresent a memethodthod fforor oobtainingbtaining highhigh qualityquality RNARNA fromfrom digesteddigested adultadult cardiaccardiac tissue for automated single-cell sequencing of both the healthy and diseased heart. Using this approach, we were able to collect reliable gene expression data for all main cardiac cell types. Clustering analysis uncovered both known and novel markers of certain cell populations, and led to the identification of multiple subpopulations within a certain cell type. Single-cell sequencing analysis of both healthy hearts and hearts suffering from ischemic injury indicated that cardiac damage gives rise to new subpopulations of known cell types. Using our single-cell sequencing data we were able to identify CKAP4 as a novel marker for activated fibroblasts, which we were able to validate in cardiac samples from patients suffering from ischemic heart disease. In a set 4 10.1161/CIRCULATIONAHA.117.030742 of in vitro experiments, we were able to show that CKAP4 is involved in myofibroblast activation. Altogether, our data for the first time show the feasibility of using single-cell sequencing on the adult heart to study transcriptomic differences between cardiac cell types and the heterogeneity in gene expression within one cell population. This method will greatly advance the molecular insights into cellular mechanisms that are relevant for cardiac remodeling and function. Downloaded from Methods An ExpandedExpanded MMethodsethods secsection,tion, a step-by-stepstep-by-step proprotoctocolol for the single-cellsingle-cell sequencingsequenccing apapproachpprp oach http://circ.ahajournals.org/ andand any associated references are available in the OnlineOnline data supplements.supplements. The data, analytanalyticic methods,methods,, and sstudytudy materials will bebe mademade availableavailable by the authors to ootherther rresearchersesearchers
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