基于一种新方法及其应用的不同质子SOBP深度的DNA损伤计算
Xianghui Kong1, Kaijin Yan1, Xinjie Wang1
1Department of Radiation Oncology, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, School of Radiation Medicine and Protection, Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions, Soochow University, Suzhou 215123, People's Republic of China.
Physics in medicine and biology
|August 6, 2025
概括
本研究介绍了模拟质子辐射DNA损伤的"系数方法",揭示了相对生物有效性 (RBE) 的显著差异,基于DNA损伤产量与传统方法相比.
科学领域:
- 医学物理 医学物理
- 辐射生物学 辐射生物学
- 计算生物学 计算生物学
背景情况:
- DNA是质子辐射生物效应的主要目标.
- 了解不同质子深度的DNA损伤产量对于分析生物效应及其变异性至关重要.
研究的目的:
- 开发和验证一种高效的模拟方法,用于计算不同质子深度的DNA损伤产量.
- 通过计算两种类型的相对生物有效性 (RBE) 来分析质子的生物效应及其在不同尺度上的可变性.
主要方法:
- 利用蒙特卡洛模拟和一种新的"系数方法"来模拟DNA损伤产量.
- 调整了参数,以模拟低能和高能质子在各种分布式布拉格峰 (SOBP) 深度的DNA损伤.
- 使用网状细胞模型计算RBEmax (每分数0Gy) 和RBEDSB (基于DNA损伤产量).
主要成果:
- "系数方法"被证明是可行的和高效的,在模拟的双链断裂 (DSB) 产量中偏差最小.
- 对于高能质子,单链断裂产量随着深度的增加而下降,而DSB产量则增加.
- 在RBEmax和RBEDSB值之间观察到实质性的差异,特别是在光束末端.
结论:
- "系数方法"是一种可靠的方法,用于模拟高能质子的DNA损伤产量.
- 从这种方法获得的RBEDSB值突出显示了与传统的RBEmax值的显著差异.
- 强调了DNA规模分析对于理解质子辐射质量和生物影响的重要性.
相关概念视频
Overview of DNA Repair
In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Chemically...
Base Excision Repair
One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
The first step of...
The first step of...
Long-patch Base Excision Repair
Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
Base-pairing and DNA Repair
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,


