基于CRISPR的人源化模型揭示STAG2缺失在家族性GATA2缺陷型骨髓增生异常综合征进展中的协同作用
A CRISPR-Based Humanized Model Reveals Cooperative Role of STAG2 Loss in Familial GATA2-Deficient MDS Progression
家族性GATA2缺陷是青少年骨髓增生异常综合征（一种造血干细胞异常导致的血液肿瘤）最常见的原因，常因合并STAG2等基因突变而加速恶化。研究者用CRISPR/Cas9基因编辑技术在人胎肝来源的造血干细胞中同时敲除GATA2和STAG2，再移植到小鼠体内建立人源化模型。结果发现，单独GATA2缺陷短期影响轻微，但合并STAG2缺失后造血干细胞自我更新增强、髓系分化偏移、原始祖细胞扩增，单细胞测序还显示干细胞相关基因和炎症通路上调。该模型较好复现了高危GATA2缺陷型骨髓增生异常综合征，为理解协同突变如何驱动疾病提供了机制线索。
为什么推荐给您：用CRISPR构建新的人源化疾病模型揭示协同突变机制，属重要新机制，但尚处临床前。
不需要生物学背景，多打比方
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摘要Abstract
Myelodysplastic syndrome (MDS) is a heterogeneous myeloid malignancy driven by hematopoietic stem cell dysfunction, leading to ineffective hematopoiesis and cytopenias. Familial GATA2 deficiency is the most common cause of Myelodysplastic syndrome in adolescents, with progression often accelerated by co-occurring mutations, notably STAG2 loss-of-function. Using CRISPR/Cas9-mediated genome engineering in primary human fetal liver-derived hematopoietic stem cells and xenotransplantation in mice, we modeled GATA2-deficient Myelodysplastic syndrome with acquired STAG2 loss to investigate disease initiation and progression. While GATA2 deficiency alone had minimal short-term impact in our model, combined GATA2 and STAG2 loss increased hematopoietic stem cell maintenance and self-renewal, induced a myeloid-lineage bias, and expanded primitive progenitors. Single-cell transcriptional profiling revealed upregulation of stemness genes and inflammatory pathways. This humanized model faithfully recapitulates high-risk GATA2-deficient Myelodysplastic syndrome, providing mechanistic insight into how cooperative mutations drive stem cell expansion, inflammatory signaling, and myeloid skewing.