The role for phase separation in oncogenesis and aberrant chromatin looping formation

相分离在肿瘤发生和异常染色质环形成中的作用

基本信息

  • 批准号:
    10908136
  • 负责人:
  • 金额:
    $ 57.28万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
  • 财政年份:
    2023
  • 资助国家:
    美国
  • 起止时间:
    2023-09-04 至 2027-06-30
  • 项目状态:
    未结题

项目摘要

PROJECT SUMMARY/ABSTRACT Rearrangement of NUP98 gene (NUP98-r) is recurrent in leukemias such as acute myeloid leukemia (AML). Patients with NUP98-r show poor prognosis and therapy failure. Most NUP98-r partners (>30 identified from patients) are a DNA-binding domain of transcription factor (TF; e.g. HOXA9) or a histone-binding motif such as Plant Homeodomain (PHD), suggesting chromatin deregulation as an oncogenic mechanism. NUP98-r fusions invariably retain Phenylalanine-Glycine (FG) repeats, termed intrinsically disordered region (IDR), from NUP98. How unstructured IDR contributes to oncogenesis remains elusive. Our studies of NUP98-HOXA9, an AML NUP98-TF chimera, unveil an essential requirement of NUP98’s IDR for liquid-liquid phase separation (LLPS). We also show that IDR and LLPS are critical for the much-enhanced genome binding by NUP98-HOXA9 and for long-distance chromatin looping between oncogene promoters and enhancers, leading to development of aggressive AML in mice. Our unpublished preliminary studies of other recurrent leukemic fusions (namely, NUP98-PHD fusions and MSI2-HOXA9, a leukemia-related chimera formed by fusing a less-studied IDR of an RNA-binding protein with HOXA9’s DNA-binding domain) all point to involvements of IDR and LLPS for oncogenesis. Thus, we hypothesize that, due to aberrant genic fusions, a number of leukemia-related onco- TFs and chromatin factors acquire a phase-separation-inducing IDR to establish LLPS, which confers chimera a much more enhanced ability in genomic targeting; consequently, an oncogenic gene-expression program is over-activated while aberrant chromatin loops are formed between oncogene promoters and enhancers, which drives formation of aggressive leukemias. Dissection of the mechanisms underlying the IDR- and phase- separation-mediated aberrant genome organization and oncogene activation in cancer cells shall provide new and paradigm-shifting views as for how aggressive cancer develops, implicative of potentially new treatments in future. Towards this goal, we will further characterize the role for the un-studied IDR (that of MSI2) in establishing LLPS in vitro and in cells (Aim 1A) and will use primary human hematopoietic stem/progenitor cells (HSPCs) and derived cells to define roles of IDR and LLPS in regulating genomic targeting (1B), the target gene expression (1C), and leukemic transformation in vitro/vivo (1D) by various fusions (NUP98-PHD and MSI2/NUP98-HOXA9). LLPS-indued chromatin looping is CTCF-independent and represents a previously unstudied mechanism underlying 3D chromatin organization. We will further define the 3D chromatin structure alterations caused by various NUP98-r and MSI2-HOXA9 fusions in disease-relevant cells (Aim 2A), define the molecular mechanisms driving formation/maintenance of LLPS-dependent loops (2B), and determine the impact of LLPS DNA loops on the sustained activation of oncogenes by using a novel CRISPR/dCas9-IDR fusion strategy (2C). As phase-separation-competent molecules are frequently implicated in a wide range of human cancers and diseases, both the significance and overall impact of the project are potentially high.
项目总结/摘要 NUP 98基因重排(NUP 98-r)在白血病如急性髓性白血病(AML)中是复发性的。 NUP 98-r患者预后差,治疗失败。大多数NUP 98-r合作伙伴(从 患者)是转录因子(TF;例如HOXA 9)的DNA结合结构域或组蛋白结合基序, 植物同源结构域(PHD),提示染色质失调是一种致癌机制。NUP 98-r融合体 总是保留来自NUP 98称为固有无序区(IDR)的苯丙氨酸-甘氨酸(FG)重复序列。 非结构化的IDR如何促进肿瘤发生仍然是难以捉摸的。NUP 98-HOXA 9是一种急性髓细胞白血病, NUP 98-TF嵌合体揭示了NUP 98 IDR对液-液相分离(LLPS)的基本要求。 我们还表明IDR和LLPS对于NUP 98-HOXA 9和H 0XA 9的增强的基因组结合是至关重要的。 癌基因启动子和增强子之间的长距离染色质环,导致 小鼠的侵袭性AML。我们对其他复发性白血病融合的未发表的初步研究(即, NUP 98-PHD融合体和MSI 2-HOXA 9,一种白血病相关嵌合体,通过融合一种研究较少的白血病细胞的IDR而形成。 RNA结合蛋白与HOXA 9的DNA结合结构域)都指出IDR和LLPS参与 肿瘤发生因此,我们假设,由于异常的基因融合,一些白血病相关的肿瘤- TF和染色质因子获得相分离诱导IDR以建立LLPS,其赋予嵌合体 基因组靶向能力大大增强;因此, 过度激活,同时在癌基因启动子和增强子之间形成异常染色质环, 导致恶性白血病的形成剖析IDR的机制-和阶段- 分离介导的异常基因组组织和癌基因激活在癌细胞中将提供新的 以及关于侵袭性癌症如何发展的范式转变观点,暗示着潜在的新治疗方法 日后为了实现这一目标,我们将进一步描述未研究的IDR(MSI 2)的作用, 在体外和细胞中建立LLPS(目标1A),并将使用原代人造血干/祖细胞 细胞(HSPC)和衍生细胞,以确定IDR和LLPS在调节基因组靶向中的作用(1B), 靶基因表达(1C)和通过各种融合(NUP 98-PHD)体外/体内白血病转化(1D 和MSI 2/NUP 98-HOXA 9)。LLPS诱导的染色质成环是CTCF独立的,代表了先前的 3D染色质组织的潜在机制尚未研究。我们将进一步定义3D染色质结构 在疾病相关细胞中由各种NUP 98-r和MSI 2-HOXA 9融合引起的改变(Aim 2A),定义了 驱动LLPS依赖性环形成/维持的分子机制(2B),并确定 通过使用新型CRISPR/dCas 9-IDR,LLPS DNA环对癌基因持续激活的影响 融合策略(2C)。由于具有相分离能力的分子经常涉及广泛的生物学领域, 人类癌症和疾病,该项目的重要性和总体影响可能很高。

项目成果

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Douglas H. Phanstiel其他文献

ALS-associated TDP-43 aggregates drive innate and adaptive immune cell activation
肌萎缩侧索硬化症(ALS)相关的TDP - 43聚集体驱动先天性和适应性免疫细胞活化
  • DOI:
    10.1016/j.isci.2025.112648
  • 发表时间:
    2025-06-20
  • 期刊:
  • 影响因子:
    4.100
  • 作者:
    Baggio A. Evangelista;Joey V. Ragusa;Kyle Pellegrino;Yijia Wu;Ivana Yoseli Quiroga-Barber;Shannon R. Cahalan;Omeed K. Arooji;Jillann A. Madren;Sally Schroeter;Joe Cozzarin;Ling Xie;Xian Chen;Kristen K. White;J. Ashley Ezzell;Marie A. Iannone;Sarah Cohen;Douglas H. Phanstiel;Rick B. Meeker;Todd J. Cohen
  • 通讯作者:
    Todd J. Cohen
Proximity-dependent recruitment of Polycomb repressive complexes by the lncRNA emAirn/em
长链非编码 RNA emAirn 依赖于邻近性招募 Polycomb 抑制复合物
  • DOI:
    10.1016/j.celrep.2023.112803
  • 发表时间:
    2023-07-25
  • 期刊:
  • 影响因子:
    6.900
  • 作者:
    Aki K. Braceros;Megan D. Schertzer;Arina Omer;Jackson B. Trotman;Eric S. Davis;Jill M. Dowen;Douglas H. Phanstiel;Erez Lieberman Aiden;J. Mauro Calabrese
  • 通讯作者:
    J. Mauro Calabrese

Douglas H. Phanstiel的其他文献

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{{ truncateString('Douglas H. Phanstiel', 18)}}的其他基金

The role for phase separation in oncogenesis and aberrant chromatin looping formation
相分离在肿瘤发生和异常染色质环形成中的作用
  • 批准号:
    10652637
  • 财政年份:
    2022
  • 资助金额:
    $ 57.28万
  • 项目类别:
The role for phase separation in oncogenesis and aberrant chromatin looping formation
相分离在肿瘤发生和异常染色质环形成中的作用
  • 批准号:
    10539807
  • 财政年份:
    2022
  • 资助金额:
    $ 57.28万
  • 项目类别:
MECHANISMS OF DYNAMIC CHROMATIN LOOPING DURING DIFFERENTIATION
分化过程中动态染色质环的机制
  • 批准号:
    10415986
  • 财政年份:
    2018
  • 资助金额:
    $ 57.28万
  • 项目类别:
MECHANISMS OF DYNAMIC CHROMATIN LOOPING DURING DIFFERENTIATION
分化过程中动态染色质环的机制
  • 批准号:
    10198946
  • 财政年份:
    2018
  • 资助金额:
    $ 57.28万
  • 项目类别:
Mechanisms of Dynamic Chromatin Looping During Differentiation - Common Fund Data Supplement
分化过程中动态染色质循环的机制 - 共同基金数据补充
  • 批准号:
    9983342
  • 财政年份:
    2018
  • 资助金额:
    $ 57.28万
  • 项目类别:

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  • 批准号:
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DETERMINANTS OF RESPONSE OF ACUTE MYELOCYTIC LEUKEMIA
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