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在乳腺癌细胞中,Her2放大,Rel-A和Bach1可以影响APOBEC3A的表达

Madeline Dennis¹, Alyssa Hurley², Nicholas Bray¹

¹School of Molecular Biosciences and Center for Reproductive Biology, Washington State University, Pullman, Washington, United States of America.

|May 28, 2024

概括

在乳腺癌中,APOBEC3A (A3A) mRNA水平与蛋白质和APOBEC突变相关. ERBB2和转录因子Rel-A/Bach1影响A3A表达,揭示了乳腺癌突变发生的机制.

科学领域:

遗传学是一个遗传学.
癌症生物学癌症生物学
分子瘤学分子瘤学

背景情况:

在人类癌症中,APOBEC诱导的突变很普遍,APOBEC3A (A3A) 是乳腺癌的关键突变原体.
在乳腺癌中驱动A3A激活和突变发生的机制在很大程度上是未知的.
了解A3A调节对于破译癌症突变特征至关重要.

研究的目的:

确定影响乳腺癌细胞基础A3AmRNA转录水平的因素.
为了研究A3A表达和APOBEC签名突变之间的关系.
探索ERBB2和特定转录因子在A3A调控中的作用.

主要方法:

在乳腺癌细胞系中分析A3AmRNA和蛋白质水平.
在A3A表达和APOBEC突变特征之间的相关性研究.
研究ERBB2表达对A3AmRNA的影响.
转录分析和ATAC-seq用于识别监管元素和转录因子.
针对STAT信号的抑制研究.

主要成果:

基底A3A mRNA水平与A3A蛋白相关,并预测乳腺癌细胞系中的APOBEC突变特征.
改变ERBB2表达影响A3AmRNA水平,这可能解释了Her2丰富乳腺癌中的APOBEC丰富.
STAT信号抑制对细胞系中的A3A丰度的影响很小.
在初级瘤中,A3A mRNA在透免疫细胞方面最高,而不是乳腺癌细胞.
转录因子Rel-A和Bach1与促进子区域结合,并提高基底A3A表达.

结论:

基底A3A转录的增加是乳腺癌突变发生的潜在机制.
ERBB2和转录因子Rel-A/Bach1是乳腺癌中A3A表达的关键调节者.
A3A调控复杂且细胞类型特定,免疫细胞在初级瘤中发挥作用.

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