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德西塔的细胞毒性是由dCMP除氨酶DCTD促进的,并由SUMO依赖的E3酶TOPORS减轻

Christopher J Carnie^1,2, Maximilian J Götz³, Chloe S Palma-Chaundler⁴

¹Cancer Research UK Cambridge Institute, University of Cambridge, Cambridge, UK. chris.carnie@cruk.cam.ac.uk.

The EMBO journal

|May 17, 2024

概括

癌症中的德西塔 (5-aza-dC) 耐药性与DCTD有关,这表明其代谢物是细胞毒性. 这项研究确定TOPORS是DNA-蛋白质交叉连接修复因子,对于decitabine疗效至关重要.

科学领域:

表观遗传学在表观遗传学中,表观遗传学是指表观遗传学.
癌症生物学癌症生物学
分子药理学分子药理学

背景情况:

德西塔 (5-aza-dC) 是一种用于治疗血液癌症的核酸相似物.
将其纳入DNA导致DNA甲基转移酶1的DNA-蛋白交叉链接 (DNMT1-DPCs) 和低甲基化.
对于decitabine的临床结果各不相同,经常复发,需要对敏感性因素进行研究.

研究的目的:

通过基因组规模的CRISPR/Cas9屏幕来识别影响德西他宾敏感性的因素.
阐明底层抗素耐药性的机制,并确定新的治疗点.

主要方法:

基因组规模的CRISPR/Cas9选用于绘制西敏感性决定因素的图.
在DCTD缺乏的细胞中进行遗传查.
在DNMT1-DPCs附近的蛋白质的蛋白质识别.

主要成果:

丢失dCMP脱氨酶 (DCTD) 赋予了对decitabine的耐药性,表明5-aza-dUMP生成是细胞毒性.
TOPORS是一种全方位素和SUMO1 E3结合酶,被确定为一种新的DNA-蛋白交联 (DPC) 修复因子.
TOPORS有助于SUMOylated DNMT1-DPCs的降解. 这一过程中,

结论:

当DPC修复受损时,由德胺诱导的DPCs会引起细胞毒性.
野生型细胞中的细胞毒性可能源于受损的核酸代谢.
这些发现可能有助于开发用于德西治疗的预测生物标志物.

关键词:

DNA 蛋白质交叉链接基因组稳定性基因组稳定性低甲基化剂的制剂核酸的新陈代谢针对 SUMO 的普遍性.

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