Tianchi Xin, PhD
Research Scientist in GeneticsCards
About
Research
Publications
2024
844 Oncogenic Kras converts ERK signal dynamics to disrupt tissue architecture independently of hyperproliferation
Xin T, Gallini S, Wei H, Gonzalez D, Regot S, Greco V. 844 Oncogenic Kras converts ERK signal dynamics to disrupt tissue architecture independently of hyperproliferation. Journal Of Investigative Dermatology 2024, 144: s147. DOI: 10.1016/j.jid.2024.06.860.Peer-Reviewed Original ResearchOncogenic Kras induces spatiotemporally specific tissue deformation through converting pulsatile into sustained ERK activation
Xin T, Gallini S, Wei H, Gonzalez D, Matte-Martone C, Machida H, Fujiwara H, Pasolli H, Suozzi K, Gonzalez L, Regot S, Greco V. Oncogenic Kras induces spatiotemporally specific tissue deformation through converting pulsatile into sustained ERK activation. Nature Cell Biology 2024, 26: 859-867. PMID: 38689013, DOI: 10.1038/s41556-024-01413-y.Peer-Reviewed Original ResearchERK signalingStem cellsSquamous cell carcinomaHair folliclesOncogenic KRAS mutationsCell carcinomaKRAS mutationsSustained ERK activationERK signaling dynamicsOncogenic mutationsOncogenic KRASERK activationStem cell behaviorIntravital imagingAbnormal cell divisionModulates specific featuresKrasG12DTissue deformationSpatiotemporally specific mannerSustained ERK signalingMutationsLiving miceFolliclesTissue disruptionSingle-cell level
2023
Organ function is preserved despite reorganization of niche architecture in the hair follicle
Wei H, Du S, Parksong J, Pasolli H, Matte-Martone C, Regot S, Gonzalez L, Xin T, Greco V. Organ function is preserved despite reorganization of niche architecture in the hair follicle. Cell Stem Cell 2023, 30: 962-972.e6. PMID: 37419106, PMCID: PMC10362479, DOI: 10.1016/j.stem.2023.06.003.Peer-Reviewed Original ResearchConceptsNiche architectureDermal papilla fibroblastsDifferentiated lineagesHair follicle growthStereotypic architectureMultipotent progenitorsEpithelial progenitorsFunctional importanceNicheStem cellsFibroblast nicheProgenitorsPowerful modelIntravital imagingDermal papillaFibroblastsHair folliclesFollicle growthOrgan functionLineagesDifferentiationCrosstalkHairProliferationCellsInjury prevents Ras mutant cell expansion in mosaic skin
Gallini S, Annusver K, Rahman N, Gonzalez D, Yun S, Matte-Martone C, Xin T, Lathrop E, Suozzi K, Kasper M, Greco V. Injury prevents Ras mutant cell expansion in mosaic skin. Nature 2023, 619: 167-175. PMID: 37344586, PMCID: PMC10322723, DOI: 10.1038/s41586-023-06198-y.Peer-Reviewed Original ResearchConceptsWild-type cellsRas family proteinsCell cycle inhibitor p21Family proteinsOncogenic RasGenetic approachesMosaic tissuesInhibition of EGFRInhibitor p21EGFR ligandsEGFR pathwayCell expansionAberrant growthConstitutive lossDifferential activationParacrine secretionAbsence of injuryCellsCompetitive balanceInjury repairHealthy skinInjurySkinProteinPathwayLive imaging reveals chromatin compaction transitions and dynamic transcriptional bursting during stem cell differentiation in vivo
May D, Yun S, Gonzalez D, Park S, Chen Y, Lathrop E, Cai B, Xin T, Zhao H, Wang S, Gonzalez L, Cockburn K, Greco V. Live imaging reveals chromatin compaction transitions and dynamic transcriptional bursting during stem cell differentiation in vivo. ELife 2023, 12: e83444. PMID: 36880644, PMCID: PMC10027315, DOI: 10.7554/elife.83444.Peer-Reviewed Original ResearchConceptsStem cell differentiationCell differentiationStem cell compartmentCompaction changesChromatin compaction statesDynamic transcriptional statesCell compartmentChromatin architectureCell cycle statusChromatin rearrangementNascent RNATranscriptional burstingTranscriptional statesLive imagingTissue contextGene expressionDifferentiating cellsGlobal remodelingIndividual cellsCycle statusStem cellsDifferentiation statusDifferentiationCellsMorphological changes
2020
Cell-Cycle-Dependent ERK Signaling Dynamics Direct Fate Specification in the Mammalian Preimplantation Embryo
Pokrass MJ, Ryan KA, Xin T, Pielstick B, Timp W, Greco V, Regot S. Cell-Cycle-Dependent ERK Signaling Dynamics Direct Fate Specification in the Mammalian Preimplantation Embryo. Developmental Cell 2020, 55: 328-340.e5. PMID: 33091369, PMCID: PMC7658051, DOI: 10.1016/j.devcel.2020.09.013.Peer-Reviewed Original ResearchConceptsFate specificationPreimplantation developmentKinase translocation reporterMammalian preimplantation embryosInner cell massEmbryonic stem cellsSingle cellsDifferent cell typesMulticellular organismsEndogenous taggingDaughter cellsNanog proteinActive ERKNanog levelsERK activityGene expressionPreimplantation embryosCell cycleTrophectoderm cellsERK inhibitionCell typesStem cellsLive embryosCell massEmbryos
2019
Hair follicle regeneration suppresses Ras-driven oncogenic growth
Pineda CM, Gonzalez DG, Matte-Martone C, Boucher J, Lathrop E, Gallini S, Fons NR, Xin T, Tai K, Marsh E, Nguyen DX, Suozzi KC, Beronja S, Greco V. Hair follicle regeneration suppresses Ras-driven oncogenic growth. Journal Of Cell Biology 2019, 218: 3212-3222. PMID: 31488583, PMCID: PMC6781447, DOI: 10.1083/jcb.201907178.Peer-Reviewed Original ResearchConceptsHair folliclesHras mutationsOncogenic growthHair follicle stem cellsSkin hair folliclesTumor developmentFollicle stem cellsHair follicle regenerationSkin epitheliumSecondary mutationsBenign outgrowthFolliclesStem cellsTissueCertain tissuesFollicle regenerationCellsContinuous tissueWild-type neighborsDistinct mechanismsDifferent outcomesMutationsEnhanced capacityInjury
2018
Flexible fate determination ensures robust differentiation in the hair follicle
Xin T, Gonzalez D, Rompolas P, Greco V. Flexible fate determination ensures robust differentiation in the hair follicle. Nature Cell Biology 2018, 20: 1361-1369. PMID: 30420661, PMCID: PMC6314017, DOI: 10.1038/s41556-018-0232-y.Peer-Reviewed Original ResearchConceptsSingle-cell levelStem cellsStem cell differentiationGerm stem cellsTissue architectureMultiple cell typesFate determinationDetermination mechanismTissue homeostasisSame stem cellsCommon progenitorDifferentiation outcomesDifferentiation stimuliDifferentiation lineageCell differentiationCell typesNormal differentiationWnt activationHair folliclesUnanticipated flexibilityDifferentiationRobust differentiationProgenitorsCellsUninjured conditionHomeostatic Epidermal Stem Cell Self-Renewal Is Driven by Local Differentiation
Mesa KR, Kawaguchi K, Cockburn K, Gonzalez D, Boucher J, Xin T, Klein AM, Greco V. Homeostatic Epidermal Stem Cell Self-Renewal Is Driven by Local Differentiation. Cell Stem Cell 2018, 23: 677-686.e4. PMID: 30269903, PMCID: PMC6214709, DOI: 10.1016/j.stem.2018.09.005.Peer-Reviewed Original Research
2017
Correction of aberrant growth preserves tissue homeostasis
Brown S, Pineda CM, Xin T, Boucher J, Suozzi KC, Park S, Matte-Martone C, Gonzalez DG, Rytlewski J, Beronja S, Greco V. Correction of aberrant growth preserves tissue homeostasis. Nature 2017, 548: 334-337. PMID: 28783732, PMCID: PMC5675114, DOI: 10.1038/nature23304.Peer-Reviewed Original Research