Dean Griffiths PhD

Dean Griffiths PhD

London, England, United Kingdom
3K followers 500+ connections

About

With over 20 years of combined commercial and research experience in the life sciences…

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Experience

  • ClearView Healthcare Partners Graphic

    ClearView Healthcare Partners

    London Area, United Kingdom

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    London, England, United Kingdom

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    Cambridge, England, United Kingdom

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    Cambridge, United Kingdom

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    Cambridge, United Kingdom

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    Cambridge, United Kingdom

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    Cambridge, United Kingdom

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    Cambridge, United Kingdom

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    Cambridge Institute for Medical Research

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    Gurdon Institute

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    Harlow, UK

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Education

  • The University of Edinburgh Graphic

    The University of Edinburgh

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    Developed a new technique for and studied the molecular mechanisms involved in the conversion of embryonic stem cells to neurons. Supervisor: Professor Austin Smith FRS

    - Creation and interrogation of genomic data to evaluate embryonic stem cell differentiation
    - Research published in a leading journal Nature Biotechnology, to date cited over 1000 times

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Publications

  • LIF-independent JAK signalling to chromatin in embryonic stem cells uncovered from an adult stem cell disease

    Nature Cell Biology

    Activating mutations in the tyrosine kinase Janus kinase 2 (JAK2) cause myeloproliferative neoplasms, clonal blood stem cell disorders with a propensity for leukaemic transformation. Leukaemia inhibitory factor (LIF) signalling through the JAK-signal transducer and activator of transcription (STAT) pathway enables self-renewal of embryonic stem (ES) cells. Here we show that mouse ES cells carrying the human JAK2V617F mutation were able to self-renew in chemically defined conditions without…

    Activating mutations in the tyrosine kinase Janus kinase 2 (JAK2) cause myeloproliferative neoplasms, clonal blood stem cell disorders with a propensity for leukaemic transformation. Leukaemia inhibitory factor (LIF) signalling through the JAK-signal transducer and activator of transcription (STAT) pathway enables self-renewal of embryonic stem (ES) cells. Here we show that mouse ES cells carrying the human JAK2V617F mutation were able to self-renew in chemically defined conditions without cytokines or small-molecule inhibitors, independently of JAK signalling through the STAT3 or phosphatidylinositol-3-OH kinase pathways. Phosphorylation of histone H3 tyrosine 41 (H3Y41) by JAK2 was recently shown to interfere with binding of heterochromatin protein 1α (HP1α). Levels of chromatin-bound HP1α were lower in JAK2V617F ES cells but increased following inhibition of JAK2, coincident with a global reduction in histone H3Y41 phosphorylation. JAK2 inhibition reduced levels of the pluripotency regulator Nanog, with a reduction in H3Y41 phosphorylation and concomitant increase in HP1α levels at the Nanog promoter. Furthermore, Nanog was required for factor independence of JAK2V617F ES cells. Taken together, these results uncover a previously unrecognized role for direct signalling to chromatin by JAK2 as an important mediator of ES cell self-renewal.

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