Featured Publications
Trophoblast inclusions in the human placenta: Identification, characterization, quantification, and interrelations of subtypes
Kliman HJ, Firestein MR, Hofmann KM, Milano KM, Holzer PH, Brink LT, Odendaal HJ, Fifer WP. Trophoblast inclusions in the human placenta: Identification, characterization, quantification, and interrelations of subtypes. Placenta 2020, 103: 172-176. PMID: 33152642, PMCID: PMC8448462, DOI: 10.1016/j.placenta.2020.10.014.Peer-Reviewed Original ResearchPlacental Pathology Findings in Unexplained Pregnancy Losses
Thompson B, Holzer P, Kliman H. Placental Pathology Findings in Unexplained Pregnancy Losses. Reproductive Sciences 2023, 31: 488-504. PMID: 37725247, PMCID: PMC10827979, DOI: 10.1007/s43032-023-01344-3.Peer-Reviewed Original ResearchWeeks of gestationCommon pathologic featureSmall placentaPathologic featuresPregnancy lossChorionic villiPlacental pathology findingsUnexplained lossUnexplained pregnancy lossAntepartum stillbirthPlacental examinationUnexplained stillbirthPathology findingsUnexplained miscarriagePrevalent abnormalityPathologic diagnosisClinical databaseStillbirthMiscarriagePathology slidesDiagnostic categoriesGenetic abnormalitiesClassification systemPlacentaPotential mechanisms
2022
Sex differences in early and term placenta are conserved in adult tissues
Olney K, Plaisier S, Phung T, Silasi M, Perley L, O’Bryan J, Ramirez L, Kliman H, Wilson M. Sex differences in early and term placenta are conserved in adult tissues. Biology Of Sex Differences 2022, 13: 74. PMID: 36550527, PMCID: PMC9773522, DOI: 10.1186/s13293-022-00470-y.Peer-Reviewed Original ResearchConceptsFirst trimester placentaLate first trimesterTerm placentaTrimester placentaFirst trimesterAdult tissuesGene expressionSex differencesLifelong health outcomesSex-differential gene expressionGenetic sexInnate immune responseFull-term placentaSex-linked genesInnate immune genesImmune responsePlacenta samplesHealth outcomesBrain tissuePlacentaGametologous genesDifferent timepointsSex chromosomesImmune genesSexX chromosome inactivation in the human placenta is patchy and distinct from adult tissues
Phung TN, Olney KC, Pinto BJ, Silasi M, Perley L, O’Bryan J, Kliman HJ, Wilson MA. X chromosome inactivation in the human placenta is patchy and distinct from adult tissues. Human Genetics And Genomics Advances 2022, 3: 100121. PMID: 35712697, PMCID: PMC9194956, DOI: 10.1016/j.xhgg.2022.100121.Peer-Reviewed Original ResearchX-chromosome inactivationAdult tissuesChromosome inactivationX chromosomeX chromosome expressionTissue-specific mapsPaternal X chromosomeHuman adult tissuesChromosome expressionX inactivationAllele-specific approachesGenetic femalesLarge patchesChromosomesHuman placentaInactivationTissueGenesRNADNAObserved sex differencesExpressionPlacenta
2021
Genetics, not the uterine environment, drive the formation of trophoblast inclusions: Insights from a twin study
Katz J, Holzer PH, Kliman HJ. Genetics, not the uterine environment, drive the formation of trophoblast inclusions: Insights from a twin study. Placenta 2021, 114: 133-138. PMID: 33941390, DOI: 10.1016/j.placenta.2021.04.010.Peer-Reviewed Original ResearchConceptsMean differenceUterine environmentTwin pairsTrophoblast inclusionsRetrospective case seriesCase seriesPregnancy lossIntrauterine environmentFetal geneticsMZ twinsDZ twinsDizygotic twin pairsMZ twin pairsGenetic abnormalitiesPlacentaZygosity groupsTwin individualsAverage numberMonozygoticTwin studiesMean absolute differenceAbsolute differenceDifferencesGroupFetuses
2017
Estimated Placental Volume and Gestational Age
Isakov KMM, Emerson JW, Campbell KH, Galerneau F, Anders AM, Lee YK, Subramanyam P, Roberts AE, Kliman HJ. Estimated Placental Volume and Gestational Age. American Journal Of Perinatology 2017, 35: 748-757. PMID: 29281842, DOI: 10.1055/s-0037-1615285.Peer-Reviewed Original ResearchConceptsGestational ageBirth weightPlacental volumeSignificant placental pathologyWeeks gestational agePlacental pathologyUltrasound scanClinical utilityNormative curvesMicroscopic evaluationPatientsFurther validationVariety of settingsAgePercentileEPVDifferent populationsSubanalysisGestationNewbornsPlacentaPathology
2014
Comment on “The placenta harbors a unique microbiome”
Kliman HJ. Comment on “The placenta harbors a unique microbiome”. Science Translational Medicine 2014, 6: 254le4-254le4. PMID: 25232175, DOI: 10.1126/scitranslmed.3009864.Peer-Reviewed Original Research
2013
Trophoblast Inclusions Are Significantly Increased in the Placentas of Children in Families at Risk for Autism
Walker CK, Anderson KW, Milano KM, Ye S, Tancredi DJ, Pessah IN, Hertz-Picciotto I, Kliman HJ. Trophoblast Inclusions Are Significantly Increased in the Placentas of Children in Families at Risk for Autism. Biological Psychiatry 2013, 74: 204-211. PMID: 23623455, PMCID: PMC3755347, DOI: 10.1016/j.biopsych.2013.03.006.Peer-Reviewed Original ResearchConceptsElevated riskPlacentas of childrenTrophoblast inclusionsUncomplicated term pregnanciesAutism spectrum disorderPositive likelihood ratioTargeted early interventionsNeurodevelopmental compromiseMultiparous womenTerm pregnancyRisk pregnanciesBiological childrenControl placentasBehavioral symptomsEarly interventionNeurodevelopmental vulnerabilityPlacentaCritical windowRisk statusPregnancyRiskNewbornsChildrenDevelopmental outcomesControl samples
2008
The fetus, not the mother, elicits maternal immunologic rejection: lessons from discordant dizygotic twin placentas
Yusuf K, Kliman HJ. The fetus, not the mother, elicits maternal immunologic rejection: lessons from discordant dizygotic twin placentas. Journal Of Perinatal Medicine 2008, 36: 291-296. PMID: 18598117, DOI: 10.1515/jpm.2008.054.Peer-Reviewed Original ResearchConceptsChronic villitisTwin placentasT cellsMaternal immunologic rejectionMaternal immune responseNumerous T cellsBirth weight differenceMouse monoclonal antibodyWeight discordancePathologic evidenceDizygotic pregnanciesAutoimmune disordersImmunologic rejectionDichorionic placentasHistologic examinationImmune responseVillitisBacterial infectionsPlacentaMonoclonal antibodiesChorionic villiFetusesMaternal environmentWeight differencesVilli
2007
Reference Weights for Placentas Delivered before the 28th Week of Gestation
Hecht JL, Kliman HJ, Allred EN, Pflueger SM, Chang C, Doss BJ, Roberts D, Livasy CA, Bhan I, Zambrano E, Ross DW, Senagore P, Husain AN, Leviton A. Reference Weights for Placentas Delivered before the 28th Week of Gestation. Placenta 2007, 28: 987-990. PMID: 17573110, DOI: 10.1016/j.placenta.2007.04.009.Peer-Reviewed Original ResearchConceptsPost-menstrual weeksSingleton placentasBirth weightPlacenta weightBirth weight z-scoreStandard weight tableWeight z-scoreSmall birth weightWeeks of gestationFetal indicationsLive infantsGestational ageTwin placentasPoor perfusionGrowth restrictionLarger sample sizeZ-scorePlacentaWeeksFetal processesStandard weightReference weightSample sizePreeclampsiaPregnancy
1992
Differentiation of the Trophoblast
Kliman H, Feinberg R. Differentiation of the Trophoblast. 1992, 3-25. DOI: 10.1007/978-3-642-84385-3_1.Peer-Reviewed Original ResearchOuter cell layersHuman trophoblastsTrophoblastic cell columnsDifferentiation pathwayUnique cellsDifferentiated functionsDifferentiation behaviorUndifferentiated cytotrophoblastsGestational ageIntermediate trophoblastSubsequent functionVillous syncytiotrophoblastCell columnVillous cytotrophoblastsHuman placentaTrophoblastCytotrophoblastsCell layerControl mechanismsBiologyDifferentiationPathwayBlastocystsPlacentaSyncytiotrophoblast
1986
Purification, Characterization, and in vitro Differentiation of Cytotrophoblasts from Human Term Placentae*
KLIMAN H, NESTLER J, SERMASI E, SANGER J, STRAUSS J. Purification, Characterization, and in vitro Differentiation of Cytotrophoblasts from Human Term Placentae*. Endocrinology 1986, 118: 1567-1582. PMID: 3512258, DOI: 10.1210/endo-118-4-1567.Peer-Reviewed Original ResearchConceptsHuman term placentaTerm placentaImmunoperoxidase methodHCG-positive cellsOccasional single cellsPregnancy-specific beta 1Human placental lactogenPercoll gradient centrifugation stepDifferentiation of cytotrophoblastsPregnancy-specific betaFunctional syncytiotrophoblastsPlacental lactogenSyncytial groupsCultured trophoblastsHuman cytotrophoblastsOccasional cellsProgesterone synthesisSyncytial trophoblastHCGEndothelial cellsBeta 1CytotrophoblastsTrophoblastTime pointsPlacenta