在基因多样化的Caenorhabditis elegans菌株中,每种和多基基物质毒性的结构特异变化
Tess C Leuthner1, Sharon Zhang2, Brendan F Kohrn3
1Department of Biology, Duke University, Durham, NC 27708, United States.
概括
和多基基物质 (PFAS) 是广泛存在的环境污染物. 这项研究使用了不同的Caenorhabditis elegans菌株来揭示不同的PFAS毒性,突出了结构-活性关系测试的必要性,以预测风险.
科学领域:
- 环境毒理学环境毒理学
- 遗传学 遗传学是一种遗传学.
- 化学安全 化学安全
背景情况:
- 和多醇基物质 (PFAS) 是普遍存在的全球污染物,与有害健康影响有关.
- 由于PFAS的结构多样性很大 (>14,500种化合物),因此无法进行全面的安全评估.
- 了解PFAS结构-活动关系对于预测毒性和告知监管行动至关重要.
研究的目的:
- 用基因上不同的Caenorhabditis elegans菌株来确定多种PFAS的毒性.
- 研究遗传变异如何影响对不同PFAS结构的敏感性.
- 建立一个框架来预测未经测试的PFAS的毒性.
主要方法:
- 在参考N2菌株和11个野生C. elegans菌株中,针对各种PFAS类生成了剂量反应曲线.
- 通过量化身体长度来评估发育性毒性,在同步L1幼虫的48小时暴露后量化身体长度.
- 计算了有效度值 (EC50) 以比较PFAS和菌株间的毒性.
主要成果:
- PFAS的毒性在三个数量级上有所不同,长链化合物比短链化合物更有毒.
- 硫胺 PFAS 与碳酸和硫酸类似物相比,具有更高的毒性.
- 在12个C. elegans菌株中观察到敏感度的显著变化,表明对不同PFAS结构的菌株特异性反应.
结论:
- 在C. elegans中的自然遗传多样性可以显示出对特定PFAS结构的独特分子反应.
- 这种方法提供了一种强大的方法来研究PFAS毒性机制.
- 研究结果可以帮助识别易受影响的人群,并预测新型PFAS的毒性,为公共卫生和环境政策提供信息.
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