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Smarcd1 subunit of SWI/SNF chromatin-remodeling complexes collaborates with E2a to promote murine lymphoid specification
Developmental Cell ( IF 10.7 ) Pub Date : 2024-09-03 , DOI: 10.1016/j.devcel.2024.08.007
Pierre Priam 1 , Veneta Krasteva 1 , Philippe Rousseau 1 , Alexandre Polsinelli 1 , Laurence Côté 1 , Ines Desanlis 2 , Azer Farah 3 , Vincent-Philippe Lavallée 3 , Marie Kmita 2 , Julie A Lessard 4
Affiliation  

Lymphocyte development from murine hematopoietic stem cells (HSCs) entails a loss of self-renewal capacity and a progressive restriction of developmental potential. Previous research from our laboratory suggests that specialized assemblies of ATP-dependent SWI/SNF chromatin-remodeling complexes play lineage-specific roles during murine hematopoiesis. Here, we demonstrate that the Smarcd1 subunit is essential for specification of lymphoid cell fate from multipotent progenitors. Acute deletion of Smarcd1 in murine adult hematopoiesis leads to lymphopenia, characterized by a near-complete absence of early lymphoid progenitors and mature B and T cells, while the myeloid and erythroid lineages remain unaffected. Mechanistically, we demonstrate that Smarcd1 is essential for the coordinated activation of a lymphoid gene signature in murine multipotent progenitors. This is achieved by interacting with the E2a transcription factor at proximal promoters and by regulating the activity of distal enhancers. Globally, these findings identify Smarcd1 as an essential chromatin remodeler that governs lymphoid cell fate.

中文翻译:


SWI/SNF 染色质重塑复合物的 Smarcd1 亚基与 E2a 合作促进小鼠淋巴指标



小鼠造血干细胞 (HSC) 的淋巴细胞发育导致自我更新能力的丧失和发育潜力的进行性限制。我们实验室先前的研究表明,ATP 依赖性 SWI/SNF 染色质重塑复合物的专门组装在小鼠造血过程中起着谱系特异性作用。在这里,我们证明 Smarcd1 亚基对于规范多能祖细胞的淋巴细胞命运至关重要。小鼠成人造血中 Smarcd1 的急性缺失导致淋巴细胞减少,其特征是早期淋巴祖细胞和成熟的 B 细胞和 T 细胞几乎完全缺失,而髓系和红系不受影响。从机制上讲,我们证明 Smarcd1 对于小鼠多能祖细胞中淋巴基因特征的协调激活至关重要。这是通过与近端启动子处的 E2a 转录因子相互作用和调节远端增强子的活性来实现的。在全球范围内,这些发现将 Smarcd1 确定为控制淋巴细胞命运的重要染色质重塑剂。
更新日期:2024-09-03
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