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Learn MoreDiffuse intrinsic pontine gliomas (DIPG) are devastating pediatric brain tumors for which there is no effective therapy. A lack of pre-clinical genetic models has affected efforts to develop therapies targeted to DIPG. Over 60% of DIPG patients carry a mutation in the histone H3F3A gene (H3.3K27M) that is often accompanied by a mutation in the TP53 gene. Here we created a genetic model in which H3.3K27M is expressed under the mouse Fabp7 promoter. These mice have disrupted embryonic development and increased susceptibility to development of lymphomas. Crosses to Trp53 knockout mice further accelerated lymphomagenesis and led to brain tumour development. Some but not all tumours acquired additional oncogenic alterations. The brain tumours faithfully recapitulate the expression profiles of DIPG patients, and brain tumours and lymphomas share significant similarities in pathway alterations, pointing to a core H3.3K27M transcriptome. Overall, this mouse model provides key insights into how H3.3K27M mutations regulate DIPG at the cellular and tumour level. SOURCE: Cynthia Hawkins Hospital for Sick Children
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