Early loss of Crebbp confers malignant stem cell properties on lymphoid progenitors.

Loss-of-function mutations of cyclic-AMP response element binding protein, binding protein (CREBBP) are prevalent in lymphoid malignancies. However, the tumour suppressor functions of CREBBP remain unclear. We demonstrate that loss of Crebbp in murine haematopoietic stem and progenitor cells (HSPCs) leads to increased development of B-cell lymphomas. This is preceded by accumulation of hyperproliferative lymphoid progenitors with a defective DNA damage response (DDR) due to a failure to acetylate p53. We identify a premalignant lymphoma stem cell population with decreased H3K27ac, which undergoes transcriptional and genetic evolution due to the altered DDR, resulting in lymphomagenesis. Importantly, when Crebbp is lost later in lymphopoiesis, cellular abnormalities are lost and tumour generation is attenuated. We also document that CREBBP mutations may occur in HSPCs from patients with CREBBP-mutated lymphoma. These data suggest that earlier loss of Crebbp is advantageous for lymphoid transformation and inform the cellular origins and subsequent evolution of lymphoid malignancies.

Citation

Sarah J Horton, George Giotopoulos, Haiyang Yun, Shabana Vohra, Olivia Sheppard, Rachael Bashford-Rogers, Mamunur Rashid, Alexandra Clipson, Wai-In Chan, Daniel Sasca, Loukia Yiangou, Hikari Osaki, Faisal Basheer, Paolo Gallipoli, Natalie Burrows, Ayşegül Erdem, Anastasiya Sybirna, Sarah Foerster, Wanfeng Zhao, Tonci Sustic, Anna Petrunkina Harrison, Elisa Laurenti, Jessica Okosun, Daniel Hodson, Penny Wright, Ken G Smith, Patrick Maxwell, Jude Fitzgibbon, Ming Q Du, David J Adams, Brian J P Huntly. Early loss of Crebbp confers malignant stem cell properties on lymphoid progenitors. Nature cell biology. 2017 Sep;19(9):1093-1104

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PMID: 28825697

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