在空间扩张的群体中选择性扫除概率
Alexander Stein1,2, Kate Bostock3, Ramanarayanan Kizhuttil4,5
1Centre for Cancer Evolution, Barts Cancer Institute, Queen Mary University of London, London, UK. alexander.stein@ulb.be.
Nature communications
|February 11, 2026
概括
在范围扩大期间的有益突变可以扫到固定,但在大多数场景中这是罕见的. 我们的模型为扫描概率提供了简单的公式,解释了为什么在固体瘤中扫描不常见.
科学领域:
- 进化生物学是进化的生物学.
- 数学建模的数学建模
- 人口遗传学 人口遗传学
背景情况:
- 范围的扩大对于塑造生物系统至关重要,从微生物到入侵物种.
- 了解扩张期间的选择性扫描是关键,但以前的模型往往忽略了空间结构或恒定的人口大小.
研究的目的:
- 调查范围扩展期间选择性扫描的概率和时间.
- 开发适用于包括突变体取代野生类型的情景的数学模型.
- 提供对空间扩张人口的进化动态的洞察.
主要方法:
- 选择性扫描概率的数学建模和分析.
- 为1,2,3维的扫描概率开发近似和精确的表达式.
- 基于代理的模拟以验证使用空间莫兰过程的预测.
主要成果:
- 衍生出简单的,维度独立的表达式,用于扫描概率,独立于突变速率.
- 通过基于代理的模拟证实了模型准确性,即使是随机的乘法适应性效应.
- 模型预测选择性扫描在固体瘤中很罕见,除了在早期生长期间.
结论:
- 范围扩大期间的选择性扫描很少见,特别是在已建立的固体瘤中.
- 开发的模型为观察到的癌症进化模式提供了一般的解释.
- 这些发现对理解各种空间扩张的生物系统的进化有意义.
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