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Astellas的基因疗法再次受到打击

2022-04-24 Allan MedSci原创

该公司针对 DMD 的基因治疗方法使用编码修饰的 U7 snRNA 的 AAV 载体来提供反义序列,该序列旨在诱导细胞跳过抗肌萎缩蛋白基因中错误或错位的遗传密码,从而恢复功能性抗肌萎缩蛋白的产生。

Duchenne 肌营养不良症(DMD)是进行性肌营养不良中最常见的类型,以进行性、致死性为主要特点。患儿通常于2~5岁时开始出现临床症状,主要表现为进行性肌无力,同时累及心肌和呼吸肌。

Duchenne 肌营养不良症 (DMD) 是由抗肌萎缩蛋白(dystrophin)缺失或功能丧失引起的。Dystrophin蛋白位于肌细胞膜下的胞质内,其通过连接肌动蛋白和dystrophin相关跨膜糖蛋白复合物,从而连接细胞内骨架和细胞外基质,保证肌细胞收缩时肌膜的完整性。当dystrophin蛋白缺失时,肌膜因结构稳定性下降而断裂,细胞外液及钙离子流入细胞内,激活蛋白酶途径,增加蛋白降解,引起肌细胞坏死。

抗肌萎缩蛋白(dystrophin)编码基因位于Xp21.1,该基因突变率高,以外显子缺失最为常见。

日本制药公司 Astellas 近日披露,根据最近的临床前研究数据,它将终止其针对 Duchenne 肌营养不良症 (DMD) 的 AT702、AT751 和 AT753 基因治疗计划。

该公司针对 DMD 的基因治疗方法使用编码修饰的 U7 snRNA 的 AAV 载体来提供反义序列,该序列旨在诱导细胞跳过抗肌萎缩蛋白基因中错误或错位的遗传密码,从而恢复功能性抗肌萎缩蛋白的产生。

AT702 是一种 AAV 反义基因疗法,是为外显子 2 跳跃的 DMD 患者设计的。同时,使用与 AT702 相同的载体骨架的候选药物 AT751 和 AT753 是为外显子 51 和外显子 53 跳跃的 DMD 患者设计的。 Astellas 曾表示,这些初始项目针对 25% 的 DMD 患者,并计划利用其外显子跳跃基因治疗平台开发更多候选药物,以覆盖多达 80% 的 DMD 患者。

 

原始出处:

https://firstwordpharma.com/story/5554133

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    2022-04-24 ms4000000391083717

    Personally, I believe that abnormal changes in genes sequences are caused by diseases, and the research direction of trying to repair a certain part of the gene is putting the cart before the horse.

    0

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    2022-04-24 ms4000000391083717

    个人认为,基因的异常变化是疾病导致的,试图修复基因的研究方向是本末倒置了。

    0

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