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dc.contributor.authorChoudry, Fizzah Aziz
dc.date.accessioned2018-10-09T14:44:29Z
dc.date.available2018-10-09T14:44:29Z
dc.date.issued2018-10-20
dc.date.submitted2018-02-23
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/283252
dc.description.abstractThe aim of this project was to investigate the transcriptome of human haematopoietic stem cells (HSCs), megakaryocytes and platelets to gain insights into steady state and accelerated thrombopoiesis that occurs in states of haemostatic demand and in thrombosis by applying these findings to the pathological setting of acute coronary thrombosis. To investigate transcriptional heterogeneity within the human HSC population, single cell RNA sequencing was performed in human bone marrow HSCs. Transcriptionally distinct subpopulations were identified including two megakaryocyte biased subsets with potentially differing functional relevance. Both populations expressed megakaryocyte specific transcripts, one of which also co-expressed common myeloid and megakaryocyte-erythroid progenitor transcripts while the other did not. This study represents the first interrogation of the human bone marrow megakaryocyte transcriptome. Cells were collected from healthy human bone marrow and analysed by low input and single cell RNA sequencing. To identify novel drivers of megakaryocyte maturation, the human bone marrow megakaryocyte transcriptome was compared to that of megakaryocytes cultured from human CD34+ cells, a process known to generate immature megakaryocytes. Transcriptional signatures associated with increasing megakaryocyte ploidy were then investigated. Increasing megakaryocyte ploidy level was found to be associated with an upregulation of transcripts involved in translation and protein processing as well as expression of a number of transmembrane receptors which might have functional relevance. Finally, the pathological setting of acute coronary thrombosis was used as a model for accelerated thrombopoiesis. Megakaryocyte and platelet transcriptomes were compared between patients with acute myocardial infarction (AMI) as well as severe coronary disease and a control group. The transcriptional signature relating to disease compared to control in megakaryocytes included upregulation of platelet activation related transcripts in megakaryocytes isolated from patients with AMI and severe coronary artery disease.
dc.description.sponsorshipFunded by Medical Research Council Clinical Research Training Fellowship
dc.language.isoen
dc.rightsAll rights reserved
dc.rightsAll Rights Reserveden
dc.rights.urihttps://www.rioxx.net/licenses/all-rights-reserved/en
dc.subjectHaematpoietic stem cells
dc.subjectMegakaryocytes
dc.subjectPlatelets
dc.subjectAcute myocardial infarction
dc.subjectSingle cell RNA-seq
dc.titleNovel insights into megakaryopoiesis, thrombopoiesis and acute coronary thrombosis: transcriptome profiling of the haematopoietic stem cell, megakaryocyte and platelet
dc.typeThesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnameDoctor of Philosophy (PhD)
dc.publisher.institutionUniversity of Cambridge
dc.publisher.departmentDepartment of Haematology
dc.date.updated2018-10-02T07:18:05Z
dc.identifier.doi10.17863/CAM.30620
dc.type.qualificationtitlePhD
cam.supervisorOuwehand, Willem
cam.supervisorMathur, Anthony
cam.thesis.fundingfalse
rioxxterms.freetoread.startdate2019-10-09


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