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在缺乏HR的瘤细胞中,SETD1A依赖的EME1转录驱动了PARPi敏感性

Ellie Sweatman¹, Rachel Bayley¹, Richad Selemane¹

¹Department of Cancer and Genomic Sciences, School of Medical Sciences, College of Medicine and Health, University of Birmingham, Birmingham, UK.

British journal of cancer

|February 24, 2025

概括

失去SETD1A或EME1会使BRCA1或ATM突变的癌细胞对像Olaparib这样的PARP抑制剂产生耐药性,这可能解释了对这些疗法的临床耐药性.

科学领域:

分子生物学分子生物学
癌症遗传学癌症遗传学
药物耐药性机制药物耐药性机制

背景情况:

具有DNA修复缺陷 (BRCA1/2或ATM突变) 的细胞对PARP抑制剂敏感.
研究了氨基甲基转移酶SETD1A在这种敏感性中的作用.

研究的目的:

确定SETD1A如何影响BRCA1/2或ATM缺陷癌细胞中PARP抑制剂诱导的细胞死亡.
阐明这种影响的潜在分子机制.

主要方法:

利用了各种癌症细胞系 (子宫,乳腺,肺,卵巢) 具有BRCA1或ATM突变.
使用siRNA或CRISPR/Cas9.9进行枯竭的SETD1A.
在对Olaparib的反应中评估了细胞活力,同源重组,DNA修复和转录性变化 (RNAseq).
分析了来自TCGA和DepMap.Map的患者生存率和癌细胞数据.

主要成果:

在BRCA1或ATM缺乏细胞中,SETD1A的丧失导致了对Olaparib的耐药性.
这种耐药性与同源重组的部分恢复有关.
与Olaparib敏感性相关的EME1的SETD1A依赖转录.
失去了SETD1A或EME1,使得BRCA1/ATM突变细胞对Olaparib有抗性.

结论:

在特定的遗传背景下,SETD1A或EME1的丢失会促进对Olaparib的耐药性.
这一发现可能解释了对PARP抑制剂的临床耐药性的发展.

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