2024
Selective utilization of glucose metabolism guides mammalian gastrulation
Cao D, Bergmann J, Zhong L, Hemalatha A, Dingare C, Jensen T, Cox A, Greco V, Steventon B, Sozen B. Selective utilization of glucose metabolism guides mammalian gastrulation. Nature 2024, 634: 919-928. PMID: 39415005, PMCID: PMC11499262, DOI: 10.1038/s41586-024-08044-1.Peer-Reviewed Original ResearchConceptsCellular metabolismMammalian gastrulationHexosamine biosynthetic pathwayTranscription factor networksCellular signaling pathwaysSignaling morphogensGlucose metabolismCellular programmeBiosynthetic pathwayFate acquisitionCell fateHousekeeping natureGenetic mechanismsMesoderm migrationFactor networksERK activationExpression patternsSignaling pathwayDevelopmental processesStem cell modelCell typesSpecialized functionsDevelopmental contextMammalian embryosMouse embryos
2023
Self-patterning of human stem cells into post-implantation lineages
Pedroza M, Gassaloglu S, Dias N, Zhong L, Hou T, Kretzmer H, Smith Z, Sozen B. Self-patterning of human stem cells into post-implantation lineages. Nature 2023, 622: 574-583. PMID: 37369348, PMCID: PMC10584676, DOI: 10.1038/s41586-023-06354-4.Peer-Reviewed Original ResearchConceptsStem cellsPlacental cell typesPost-implantation embryonic developmentHuman pluripotent stem cellsPluripotent stem cellsHuman embryonic developmentEmbryonic developmentHuman stem cellsCongenital pathologyPost-implantation epiblastDiverse cell statesSingle-cell transcriptomicsAmniotic ectodermExtra-embryonic endodermSpontaneous differentiationSignaling hubThree-dimensional structureSecreted modulatorsCell types
2021
Human embryo polarization requires PLC signaling to mediate trophectoderm specification
Zhu M, Shahbazi M, Martin A, Zhang C, Sozen B, Borsos M, Mandelbaum RS, Paulson RJ, Mole MA, Esbert M, Titus S, Scott RT, Campbell A, Fishel S, Gradinaru V, Zhao H, Wu K, Chen ZJ, Seli E, de los Santos MJ, Goetz M. Human embryo polarization requires PLC signaling to mediate trophectoderm specification. ELife 2021, 10: e65068. PMID: 34569938, PMCID: PMC8514238, DOI: 10.7554/elife.65068.Peer-Reviewed Original ResearchMeSH KeywordsActinsAdultBody PatterningCell DifferentiationCell LineageCell PolarityEmbryo Culture TechniquesEmbryo, MammalianFemaleGATA3 Transcription FactorGene Expression Regulation, DevelopmentalGene Expression Regulation, EnzymologicHumansPhosphoinositide Phospholipase CPhospholipase C betaPregnancySignal TransductionTime FactorsYoung AdultConceptsApical domain formationInner cell massEmbryo polarizationPhospholipase CFirst lineage segregationApico-basal polarizationEight-cell stageLineage segregationMammalian developmentTrophectoderm specificationTE fateApical enrichmentApical accumulationDistinct lineagesApical domainApolar cellsPar complexPolarized cellsRNA interferenceMolecular mechanismsF-actinHuman embryosCell stageEmbryosDomain formationUnfolded protein response triggers differential apoptotic mechanisms in ovaries and early embryos exposed to maternal type 1 diabetes
Okan A, Demir N, Sozen B. Unfolded protein response triggers differential apoptotic mechanisms in ovaries and early embryos exposed to maternal type 1 diabetes. Scientific Reports 2021, 11: 12759. PMID: 34140543, PMCID: PMC8211688, DOI: 10.1038/s41598-021-92093-3.Peer-Reviewed Original ResearchConceptsUnfolded protein responseProtein responseER stressDiabetes mellitusFemale mammalian reproductive systemEndoplasmic reticulum (ER)-stressMaternal type 1 diabetesEmbryonic developmentActivation of ER stressMammalian ovarian functionType 1 DMIn vivo mouse modelInduced developmental programAdult ovarian tissueEffect of DMMammalian reproductive systemEarly embryonic developmentEarly embryo developmentPre-implantation embryosType 1 diabetesApoptotic cascadeDiabetic ovariesMaternal DMActivated CHOPCaspase 12
2019
Dehydroepiandrosterone supplementation attenuates ovarian ageing in a galactose-induced primary ovarian insufficiency rat model
Sozen B, Ozekinci M, Erman M, Gunduz T, Demir N, Akouri R. Dehydroepiandrosterone supplementation attenuates ovarian ageing in a galactose-induced primary ovarian insufficiency rat model. Journal Of Assisted Reproduction And Genetics 2019, 36: 2181-2189. PMID: 31422495, PMCID: PMC6823469, DOI: 10.1007/s10815-019-01560-4.Peer-Reviewed Original ResearchConceptsPrimary ovarian insufficiencyDehydroepiandrosterone treatmentOvarian agingDecreased follicle numberReduced follicle poolPrimordial follicle recruitmentGalactose-containing dietOvarian follicle countsEffect of dehydroepiandrosteroneExpression of Ki67 proteinBody weightApoptosis marker expressionExpression of cleaved-caspase-3MethodsPregnant ratsOffspring ovariesFollicle poolOvarian insufficiencyFollicle countCell death assessmentFollicle recruitmentOvarian tissueIncreased atresiaKi67 proteinRat modelGroup 2FoxO transcription factors 1 regulate mouse preimplantation embryo development
Kuscu N, Gungor-Ordueri N, Sozen B, Adiguzel D, Celik-Ozenci C. FoxO transcription factors 1 regulate mouse preimplantation embryo development. Journal Of Assisted Reproduction And Genetics 2019, 36: 2121-2133. PMID: 31396850, PMCID: PMC6823425, DOI: 10.1007/s10815-019-01555-1.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsApoptosisBlastocystCell Cycle CheckpointsCell Cycle ProteinsEmbryonic DevelopmentFas Ligand ProteinFemaleForkhead Box Protein O1Forkhead Box Protein O3Forkhead Transcription FactorsGene Expression Regulation, DevelopmentalHumansMiceP21-Activated KinasesPregnancySirtuin 1Tumor Suppressor Protein p53ConceptsPreimplantation embryo developmentFOXO transcription factorsFas ligandTranscription factorsRelated proteinsProteins regulating apoptosisPreimplantation embryosCell cycle related proteinsCleaved caspase 3 proteinsCell cycle arrestDevelopmental competence of embryosEmbryo developmentMouse preimplantation embryo developmentApoptosis-related proteinsMouse embryosCaspase 3 proteinTwo-cell mouse embryosResveratrol treatmentCompetence of embryosHuman preimplantation embryosMouse preimplantation embryosFOXO genesDUTP nick end labeling assayNick end labeling assayKnockdown embryos
2016
Expression of aquaporin-7 and aquaporin-9 in tanycyte cells and choroid plexus during mouse estrus cycle
Yaba A, Sozen B, Suzen B, Demir N. Expression of aquaporin-7 and aquaporin-9 in tanycyte cells and choroid plexus during mouse estrus cycle. Morphologie 2016, 101: 39-46. PMID: 27746040, DOI: 10.1016/j.morpho.2016.09.001.Peer-Reviewed Original ResearchConceptsMouse estrus cycleTanycyte cellsAQP-7Family of transmembrane proteinsEpithelial cells of choroid plexusPotential energy substratesExpression of aquaporin 7Oestrous cycleTransmembrane proteinsGlycerol transportRegulate reproductive functionMetestrus stageAquaporin 7Differential staining patternsProestrus stageAQP-9Diestrus stageProteinChoroid plexusEstrus stageHormonal controlMedian eminenceEpithelial cellsAquaporin-9Weak immunoreactivity
2015
CD90 and CD105 expression in the mouse ovary and testis at different stages of postnatal development
Tepekoy F, Ozturk S, Sozen B, Ozay R, Akkoyunlu G, Demir N. CD90 and CD105 expression in the mouse ovary and testis at different stages of postnatal development. Reproductive Biology 2015, 15: 195-204. PMID: 26679159, DOI: 10.1016/j.repbio.2015.10.004.Peer-Reviewed Original ResearchConceptsExpression of CD90Postnatal developmentGerm cellsPostnatal dayCell typesSomatic cellsGerm cell compartmentMesenchymal stem cell markersStem cell markersStages of gonadal developmentStages of postnatal developmentExpression of CD105Female gonadal cellsMouse gonadsSertoli cellsPostnatal gonadsTesticular expressionMouse ovariesGonadal cellsCD105 expressionCell markersGonadal developmentAdult ovariesImmunohistochemical localizationCD105The p38 MAPK signalling pathway is required for glucose metabolism, lineage specification and embryo survival during mouse preimplantation development
Sozen B, Ozturk S, Yaba A, Demir N. The p38 MAPK signalling pathway is required for glucose metabolism, lineage specification and embryo survival during mouse preimplantation development. Cells And Development 2015, 138: 375-398. PMID: 26025760, DOI: 10.1016/j.mod.2015.05.002.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsApoptosisBlastocystBlastocyst Inner Cell MassCell DeathCell LineageEmbryonic DevelopmentFemaleGene Expression Regulation, DevelopmentalGlucoseGlucose Transporter Type 1Glucose Transporter Type 4ImidazolesMaleMAP Kinase Signaling SystemMiceMice, Inbred BALB CModels, BiologicalPregnancyProtein Kinase InhibitorsPyridinesRNA, MessengerConceptsPreimplantation developmentP38 mitogen-activated protein kinaseMitogen-activated protein kinaseLate preimplantation stagePreimplantation embryo developmentMouse preimplantation developmentExpression levelsEmbryo developmentEffect of p38 MAPK inhibitionExpression levels of NANOGEarly embryo developmentP38 MAPK inhibitionPresence of SB203580P38 MAPK signaling pathwayLevel of transcriptionIncreased cell deathSignal transduction pathwaysBlastocyst stageExpression levels of transcriptsLevels of NanogP38 MAPK pathwayPreimplantation stagesLevels of GLUT1Expression levels of Glut1MAPK signaling pathway
2014
Epab and Pabpc1 are differentially expressed in the postnatal mouse ovaries
Ozturk S, Sozen B, Demir N. Epab and Pabpc1 are differentially expressed in the postnatal mouse ovaries. Journal Of Assisted Reproduction And Genetics 2014, 32: 137-146. PMID: 25370180, PMCID: PMC4294878, DOI: 10.1007/s10815-014-0362-5.Peer-Reviewed Original ResearchConceptsPostnatal mouse ovariesCumulus-oocyte complexesMouse ovariesPABPC1 genePrepubertal ovariesGranulosa cellsGerm cellsPrepubertal mouse ovariesEarly preimplantation embryosOvarian follicle countsCytoplasm of oocytesRNA in situ hybridizationReal-time polymerase chain reactionVertebrate germ cellsExpression levelsMII oocytesOocyte complexesPostnatal ovaryCumulus cellsPreimplantation embryosFollicle countPABPC1 expressionQuantitative real-time polymerase chain reactionPolymerase chain reactionFollicular stageSuperovulation alters embryonic poly(A)-binding protein (Epab) and poly(A)-binding protein, cytoplasmic 1 (Pabpc1) gene expression in mouse oocytes and early embryos
Ozturk S, Yaba-Ucar A, Sozen B, Mutlu D, Demir N. Superovulation alters embryonic poly(A)-binding protein (Epab) and poly(A)-binding protein, cytoplasmic 1 (Pabpc1) gene expression in mouse oocytes and early embryos. Reproduction Fertility And Development 2014, 28: 375-383. PMID: 25034140, DOI: 10.1071/rd14106.Peer-Reviewed Original ResearchMeSH KeywordsAnimalsBlastocystCells, CulturedChorionic GonadotropinDose-Response Relationship, DrugEmbryo Culture TechniquesFemaleFertility Agents, FemaleGene Expression Regulation, DevelopmentalGonadotropins, EquineMice, Inbred BALB COocytesOvulation InductionPoly(A)-Binding Protein IPoly(A)-Binding ProteinsSuperovulationTime FactorsConceptsEmbryonic poly(A)-binding proteinPregnant mare serum gonadotropinHuman chorionic gonadotrophinEarly embryo developmentAssisted reproductive technologyMII oocytesFemale miceAdministered to female miceGerminal vesicleOocyte maturationEmbryo developmentIncreased postimplantation lossDose of gonadotropinsCycling female miceDecreased implantation rateQuality of oocytesImpaired oocyte maturationGene expressionExperimental animal studiesEffects of superovulationReverse transcription-polymerase chain reactionPoly(A)-binding proteinPotential risk factorsTranscription-polymerase chain reactionImplantation rate
2013
Telomere length and telomerase activity during oocyte maturation and early embryo development in mammalian species
Ozturk S, Sozen B, Demir N. Telomere length and telomerase activity during oocyte maturation and early embryo development in mammalian species. Molecular Human Reproduction 2013, 20: 15-30. PMID: 23928157, DOI: 10.1093/molehr/gat055.Peer-Reviewed Original ResearchConceptsGranulosa cellsTelomerase activityProliferative granulosa cellsEarly embryosEarly embryo developmentTelomere lengthProliferative somatic cellsMammalian speciesEffects of oxidative stressOocyte maturationCancer cellsNon-dividing cellsStem cellsAdverse effects of oxidative stressShortened telomeresSomatic cellsOocytesEmbryo developmentAdverse effectsGranulosaGenotoxic agentsOxidative stressGermline cellsComprehensive review articleLength of telomeres