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SCI

29July

Persistenceofaregeneration-associated,transitionalalveolarepithelialcellstateinpulmonaryfibrosis

KobayashiY,TataA,KonkimallaA,etal.Persistenceofaregeneration-associated,transitionalalveolarepithelialcellstateinpulmonaryfibrosis[publishedonlineaheadofprint,Jul13].NatCellBiol.;10./s---8.doi:10./s---8

CorrespondenceandrequestsformaterialsshouldbeaddressedtoP.R.T.e-mail:purushothamarao.tata

duke.edu

Stemcellsundergodynamicchangesinresponsetoinjurytoregeneratelostcells.However,theidentityoftransitionalstatesandthemechanismsthatdrivetheirtrajectoriesremainunderstudied.Usinglungorganoids,multipleinvivorepairmodels,single-celltranscriptomicsandlineagetracing,wefindthatalveolartype-2epithelialcellsundergoingdifferentiationintotype-1cellsacquirepre-alveolartype-1transitionalcellstate(PATS)enroutetoterminalmaturation.Transitionalcellsundergoextensivestretchingduringdifferentiation,makingthemvulnerabletoDNAdamage.CellsinthePATSshowanenrichmentofTP53,TGF¦Â,DNA-damage-responsesignallingandcellularsenescence.GainandlossoffunctionaswellasgenomicbindingassaysrevealedadirecttranscriptionalcontrolofPATSbyTP53signalling.Notably,accumulationofPATS-likecellsinhumanfibroticlungswasobserved,suggestingpersistenceofthetransitionalstateinfibrosis.Ourstudythusimplicatesatransientstateassociatedwithsenescenceinnormalepithelialtissuerepairanditsabnormalpersistenceindiseaseconditions.

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