Transcriptomic changes including p53 dysregulation prime DNMT3A mutant cells for transformation.

IF 6.5 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Erin M Lawrence, Amali Cooray, Andrew J Kueh, Martin Pal, Lin Tai, Alexandra L Garnham, Connie S N Li-Wai-Suen, Hannah Vanyai, Quentin Gouil, James Lancaster, Sylvie Callegari, Lauren Whelan, Elizabeth Lieschke, Annabella Thomas, Andreas Strasser, Yang Liao, Wei Shi, Andrew H Wei, Marco J Herold
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引用次数: 0

Abstract

DNMT3A mutations are prevalent in haematologic malignancies. In our mouse model the murine homologue (R878H) of the human 'hotspot' R882H mutation is introduced into the mouse Dnmt3a locus. This results in globally reduced DNA methylation in all tissues. Mice with heterozygous R878H DNMT3A mutations develop γ-radiation induced thymic lymphoma more rapidly than control mice, suggesting a vulnerability to stress stimuli in Dnmt3aR878H/+ cells. In competitive transplantations, Dnmt3aR878H/+ Lin-Sca-1+Kit+ (LSK) haematopoietic stem/progenitor cells (HSPCs) have a competitive advantage over WT HSPCs, indicating a self-renewal phenotype at the expense of differentiation. RNA sequencing of Dnmt3aR878H/+ LSKs exposed to low dose γ-radiation shows downregulation of the p53 pathway compared to γ-irradiated WT LSKs. Accordingly, reduced PUMA expression is observed by flow cytometry in the bone marrow of γ-irradiated Dnmt3aR878H/+ mice due to impaired p53 signalling. These findings provide new insights into how DNMT3A mutations cause subtle changes in the transcriptome of LSK cells which contribute to their increased self-renewal and propensity for malignant transformation.

转录组学改变,包括p53失调,导致DNMT3A突变细胞转化。
DNMT3A突变在血液恶性肿瘤中普遍存在。在我们的小鼠模型中,人类“热点”R882H突变的小鼠同源物(R878H)被引入小鼠Dnmt3a位点。这导致所有组织的DNA甲基化整体降低。携带杂合子R878H DNMT3A突变的小鼠发生γ辐射诱导的胸腺淋巴瘤的速度比对照组小鼠快,这表明Dnmt3aR878H/+细胞对应激刺激的易感性。在竞争性移植中,Dnmt3aR878H/+ Lin-Sca-1+Kit+ (LSK)造血干细胞/祖细胞(HSPCs)比WT HSPCs具有竞争优势,表明以牺牲分化为代价的自我更新表型。低剂量γ辐射下Dnmt3aR878H/+ lsk的RNA测序显示,与γ辐射下的WT lsk相比,p53通路下调。因此,流式细胞术观察到γ-辐照Dnmt3aR878H/+小鼠骨髓中由于p53信号通路受损,PUMA表达降低。这些发现为DNMT3A突变如何引起LSK细胞转录组的细微变化提供了新的见解,这些变化有助于它们增加自我更新和恶性转化的倾向。
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来源期刊
EMBO Reports
EMBO Reports 生物-生化与分子生物学
CiteScore
11.20
自引率
1.30%
发文量
267
审稿时长
1 months
期刊介绍: EMBO Reports is a scientific journal that specializes in publishing research articles in the fields of molecular biology, cell biology, and developmental biology. The journal is known for its commitment to publishing high-quality, impactful research that provides novel physiological and functional insights. These insights are expected to be supported by robust evidence, with independent lines of inquiry validating the findings. The journal's scope includes both long and short-format papers, catering to different types of research contributions. It values studies that: Communicate major findings: Articles that report significant discoveries or advancements in the understanding of biological processes at the molecular, cellular, and developmental levels. Confirm important findings: Research that validates or supports existing knowledge in the field, reinforcing the reliability of previous studies. Refute prominent claims: Studies that challenge or disprove widely accepted ideas or hypotheses in the biosciences, contributing to the correction and evolution of scientific understanding. Present null data: Papers that report negative results or findings that do not support a particular hypothesis, which are crucial for the scientific process as they help to refine or redirect research efforts. EMBO Reports is dedicated to maintaining high standards of scientific rigor and integrity, ensuring that the research it publishes contributes meaningfully to the advancement of knowledge in the life sciences. By covering a broad spectrum of topics and encouraging the publication of both positive and negative results, the journal plays a vital role in promoting a comprehensive and balanced view of scientific inquiry. 
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