自然遗传变异影响应激诱导的静止和再生,以响应拉帕米辛
Sahiti Peddibhotla1,2, Miriam Gonzaga1,2, Tricia Zhang1,2
1Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.
Cells
|February 12, 2026
概括
遗传背景显著影响细胞在辐射后对拉帕素的反应. 线粒体动态的差异,而不是DNA修复,解释了不同的敏感性,影响组织再生和癌症干细胞休眠.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 遗传学是一种遗传学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 电离辐射 (IR) 诱导干细胞的细胞循环停止 (静止),以防止细胞亡.
- 作为哺乳动物的目标,拉巴胺素复合物1 (mTORC1) 的抑制控制了进入和退出静止状态.
- 拉帕米辛是一种mTORC1抑制剂,可以防止瘤再生,但它的有效性各不相同.
研究的目的:
- 研究自然遗传变异如何影响红外线后对拉帕素的反应.
- 确定在IR后静止和再生中的不同拉巴胺素敏感性背后的机制.
主要方法:
- 使用Drosophila遗传学参考小组 (DGRP) 来评估自然遗传变异.
- 检查了线粒体循环和DNA损伤修复过程,以响应IR和拉巴胺.
- 分析了拉巴胺对IR后静止和组织再生的影响.
主要成果:
- 整个DGRP的自然遗传变异导致了拉巴素对IR后静止和再生的影响的显著差异.
- 拉巴胺素敏感度的变化与线粒体动态的差异比DNA损伤修复更密切相关.
- 遗传背景极大地影响干细胞重新进入细胞周期的抑制.
结论:
- 遗传背景是决定拉巴胺在调节干细胞静止和再生中的有效性的关键因素.
- 线粒体调节是一个关键的机制,解释了对拉巴胺治疗的差异性反应.
- 这项研究强调了在开发涉及拉巴胺的治疗策略时考虑遗传变异的重要性.
相关概念视频
01:25Genetic Variation
1.4K
Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
Genes exist in different versions called alleles,...
Genes exist in different versions called alleles,...
1.4K
02:02Responses to Salt Stress
14.7K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
14.7K
02:45Responses to Heat and Cold Stress
14.9K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
14.9K
01:21Stress Response System
928
The stress response system, also known as the fight-or-flight response, is the body's automatic physiological reaction to perceived threats. Hans Selye introduced the concept of General Adaptation Syndrome (GAS) to describe the predictable pattern of changes that occur in response to stress. GAS consists of three sequential stages: alarm, resistance, and exhaustion. This model helps explain how chronic stress can contribute to health problems.
Alarm stage
In the alarm stage, the body's...
Alarm stage
In the alarm stage, the body's...
928
01:32What is Natural Selection?
129.8K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
129.8K
01:20Psychological Responses to Stress
729
Psychological responses to stress encompass the various cognitive and emotional reactions individuals experience when faced with challenging or threatening situations, such as a job loss. Prolonged exposure to stressors can disturb emotional balance, increasing negative emotions (e.g., anxiety and sadness) and diminishing positive emotions (e.g., joy and satisfaction). These persistent emotional shifts are associated with an increased risk of both physical illness and mental health issues, such...
729