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基因抑制特征ABHD18作为巴斯综合征的治疗目标

Sanna N Masud^1,2, Anchal Srivastava³, Patricia Mero¹

¹Program in Genetics and Genome Biology, The Hospital for Sick Children, Toronto, Ontario, Canada.

|September 3, 2025

概括

研究人员确定ABHD18是心脏脂蛋白 (CL) 重塑中的关键酶. 禁用ABHD18可以纠正线粒体缺陷,并改善巴斯综合征 (一种遗传性疾病) 的生存率.

科学领域:

生物化学
线粒体生物学
遗传学

背景情况:

心脏脂蛋白 (CL) 对于线粒体内膜功能至关重要,并稳定电子运输链复合体.
新生CL的重塑涉及替换新生acyl链,但负责新生CL (nCL) 裂变的酶仍然未知.
巴特综合症是一种遗传性疾病,其特征是由于TAFAZZIN (TAZ) 突变而导致单心脂蛋白 (MLCL) 积累.

研究的目的:

在心脏脂蛋白生物合成途径中识别负责新生心脏脂蛋白 (nCL) 的酶.
研究ABHD18在心脏蛋白重塑中的作用及其与巴斯综合征的潜在联系.
评估针对巴斯综合征的ABHD18治疗潜力.

主要方法:

在体外的酶定量测试以确定ABHD18在CL上的脱酶活性.
细胞和动物模型评估ABHD18无活化的体内效应.
在血清和组织中分析脂质概况以观察CL和MLCL水平的变化.
在小鼠模型中评估细胞和疾病表型中的线粒体功能.
开发和测试ABHD18的小分子抑制剂.

主要成果:

ABHD18被确定为一种在体外将CL转化为MLCL的候选脱酶.
在血清和组织中,ABHD18的无活化导致nCL的积累.
在巴斯综合征的小鼠模型中,ABHD18无活化挽救了细胞中的线粒体缺陷,并改善了疾病表型.
选择性ABHD18抑制剂在患者衍生的纤维细胞和斑马鱼胚胎中挽救了TAZ突变表型.

结论:

ABHD18是心脂蛋白生物合成途径中的正规酶,特别参与CL重塑.
通过纠正异常的CL代谢,针对ABHD18提供了一个有前途的治疗策略.
这项研究通过确定其潜在途径中的关键酶参与者来证明单一性疾病的遗传抑制.

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