需要用于细胞类型特定表达FOXP3的Cis调节元件和转录因子电路
Jennifer M Umhoefer1,2,3, Maya M Arce1,2,3, Sean Whalen4
1Gladstone-UCSF Institute of Genomic Immunology, San Francisco, CA, USA.
bioRxiv : the preprint server for biology
|September 16, 2024
概括
研究人员确定了控制T细胞中FOXP3表达的cis调节元件 (CREs) 和转录因子 (TFs). 这揭示了FOXP3基因调节在小鼠和人类之间如何不同,影响免疫恒温.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- FOXP3 是一个关键的转录因子 (TF),定义调节性T细胞 (Tregs),对免疫抑制至关重要.
- 鼠只在Tregs中表达FOXP3,而人类也在常规CD4+T细胞 (Tconvs) 中暂时表达它.
- 这些独特的FOXP3表达模式的潜在机制尚不清楚.
研究的目的:
- 识别控制FOXP3表达的 cis调节元件 (CREs) 和跨作用因子 (TFs).
- 了解老鼠和人类T细胞之间FOXP3调节的差异.
- 阐明了在免疫平衡中控制FOXP3表达的进化机制.
主要方法:
- 采用CRISPR屏幕,在人类Tregs和Tconvs.中切割FOXP3位点和准TFs.
- 分析的重点是确定对FOXP3监管至关重要的CREs和TFs.
- 对小鼠CREs进行了变异性研究,以评估它们的功能.
主要成果:
- 人类Tconv FOXP3表达依赖Treg CREs的一个子集,以及Tconv特定的阳性 (TcNS+) 和阴性 (TcNS-) CREs.
- 已识别的TF占据并调节这些CRE,作为FOXP3.3的关键调节器.
- 发现一种小鼠TcNS元素对于限制FOXP3表达在Tregs中至关重要.
结论:
- 已经确定了控制FOXP3表达的CREs和TFs的调节电路.
- 这项研究揭示了调节FOXP3机制的演变,FOXP3是一种对免疫平衡至关重要的基因.
- 了解这些监管差异可以了解免疫系统的功能和潜在的治疗点.
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