在神经母细胞瘤中,BARD1生殖系变异诱导了哈普隆缺陷和DNA修复缺陷
Michael P Randall1, Laura E Egolf1,2, Zalman Vaksman1,3
1Division of Oncology and Center for Childhood Cancer Research, Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Journal of the National Cancer Institute
|September 9, 2023
概括
生殖系BARD1变种损害了DNA修复,增加了神经母细胞瘤的风险. 这一发现为这种侵袭性儿童癌症提供了新的治疗点.
科学领域:
- 遗传学 遗传学 是一个
- 在瘤学瘤学.
- 分子生物学分子生物学
背景情况:
- 高危神经母细胞瘤是一种具有复杂遗传基础的致命儿童癌症.
- 全基因组研究在神经母细胞瘤患者中发现了常见和罕见的BARD1生殖系变异.
- 这些BARD1变异对疾病发展的功能影响以前尚不清楚.
研究的目的:
- 研究神经母细胞瘤中BARD1生殖系变异的功能后果.
- 为了将BARD1基因型与基因表达,DNA损伤和修复效率相关联.
- 探索BARD1功能障碍的潜在治疗影响.
主要方法:
- 与BARD1mRNA水平和瘤组织中的DNA损伤负担相关的BARD1基因型.
- 使用CRISPR-Cas9生成同源细胞模型 (神经母细胞瘤和对照) 来引入特定的BARD1功能丧失变异.
- 评估了DNA修复效率,RAD51焦点形成,以及变体细胞中对化疗和PARP抑制的敏感性.
主要成果:
- 与神经母细胞瘤相关的BARD1变异与减少的BARD1mRNA和增加的DNA损伤有关.
- 具有BARD1功能丧失变异的同源细胞显示DNA双链断裂的修复受损.
- 这些细胞表现出有缺陷的RAD51修复焦点形成和对西斯普拉丁和PARP抑制剂的敏感性.
结论:
- 生殖系BARD1变种损害了DNA修复的可靠性,导致神经母细胞瘤的发病.
- 由BARD1变体破坏的DNA修复是神经母细胞瘤病变发生的关键分子机制.
- 这些发现表明BARD1是神经母细胞瘤治疗的潜在治疗点.
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