导致鱼中萨克西托克辛耐药性的酸通道突变增加了PSP的风险
V Monica Bricelj1, Laurie Connell, Keiichi Konoki
1Institute for Marine Biosciences, National Research Council, Halifax, Nova Scotia B3H 3Z1, Canada. monica.bricelj@nrc-cnrc.gc.ca
Nature
|April 9, 2005
概括
性贝类中毒 (PSP) 毒素被双软体动物积累. 软贝 (Mya arenaria) 的基因突变为这些毒素提供了耐药性,影响人类健康风险.
科学领域:
- 海洋生物学 海洋生物学
- 神经毒理学 神经毒理学
- 生态毒理学 生态毒理学
背景情况:
- 双类软体动物是人类性贝类中毒 (PSP) 的主要载体.
- PSP毒素 (PST) 在软体动物中积累,并通过阻断神经纤维中的通道而导致死亡.
- 在软体动物积累PST的能力方面存在物种间的变化.
研究的目的:
- 为了确定单一物种 (Mya arenaria) 内PSP耐药性变化的分子基础.
- 调查基因适应在软贝PST耐药性中的作用.
- 了解PST耐药性对人类健康和海洋生态系统的影响.
主要方法:
- 整个神经测试被用来比较暴露和未暴露区域的软贝的PST抵抗.
- 对抗性和敏感性的道萨克西托克辛结合部位的比较分析.
- 研究自然突变对毒素结合亲缘关系的影响.
主要成果:
- 来自"红潮"地区的软贝比敏感贝具有更高的PST抵抗力和毒素积累率.
- 通道孔中的单个氨基酸突变显著降低了抗性的萨克西托克素结合亲和力 (1,000倍).
- PST作为选择性死亡因子,导致鱼种群中毒素耐药性增加.
结论:
- 在Mya arenaria种群中,一种特定的基因突变赋予了显著的PST耐药性.
- 在软体动物中增加PST耐药性,对人类造成PSP的风险更大.
- 扩大PSP可能会导致沿海生态系统的长期生态和社区转变.
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