在内分泌治疗耐药性前列腺癌中,AR基因拷贝数和结构复杂性的共同进化
Andrej Zivanovic1, Jeffrey T Miller2, Sarah A Munro2
1Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA.
NAR cancer
|August 28, 2023
概括
由于雄激素受体 (AR) 的重新激活,化抵抗性前列腺癌 (CRPC) 进展. 我们发现,染色体外DNA (ecDNA) 驱动复杂的AR基因变异和拷贝数增加,导致内分泌疗法耐药性.
科学领域:
- 在瘤学瘤学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 安卓素受体 (AR) 抑制是晚期前列腺癌 (PC) 的标准治疗方法.
- 前列腺癌 (CRPC) 的进展往往是由AR重新激活引起的,涉及AR放大和结构重组.
- 这些AR变化的共同发生在CRPC中引发了关于细胞间与细胞内异质性的问题.
研究的目的:
- 调查AR再激活和CRPC基因变化的基础机制.
- 确定异染色体DNA (ecDNA) 是否有助于AR放大和结构复杂性.
- 确定前列腺癌内分泌疗法耐药性的潜在治疗标和预测生物标志物.
主要方法:
- 使用链接读取DNA测序分析了41个CRPC瘤和6个患者衍生异种移植 (PDXs).
- 在PDX模型中采用了光学基因组映射和光 in situ 杂交 (FISH).
- 对AR基因变异的AR表达水平和多样性的评估.
主要成果:
- 七个CRPC瘤表现出复杂的,多重重排的AR基因结构以及非常高的AR拷贝数.
- 位于染色体外DNA (ecDNA) 上的AR被确定为PDX模型中的关键机制.
- 在ecDNA上的AR与高度和多样化的AR表达水平相关.
结论:
- 通过ecDNA对AR基因拷贝数和结构复杂性的共同进化是驱动前列腺癌内分泌治疗耐药性的重要机制.
- 了解ecDNA上的AR变化对于开发CRPC新型治疗策略和生物标志物至关重要.
- 这项研究强调了ecDNA在AR再激活和晚期前列腺癌治疗失败中的作用.
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