Hereditary tyrosinemia type 1 (HT1) is a severe human autosomal recessive disorder caused by the deficiency of fumarylacetoacetate hydroxylase (FAH), an enzyme catalyzing the last step in the tyrosine degradation pathway. Lack of FAH causes accumulation of toxic metabolites (fumarylacetoacetate and succinylacetone) in blood and tissues, ultimately resulting in severe liver and kidney damage with onset that ranges from infancy to adolescence. This tissue damage is lethal but can be controlled by administration of 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione (NTBC), which inhibits tyrosine catabolism upstream of the generation of fumarylacetoacetate and succinylacetone. Notably, in animals lacking FAH, transient withdrawal of NTBC can be used to induce liver damage and a concomitant regenerative response that stimulates the growth of healthy hepatocytes. Among other things, this model has raised tremendous interest for the in vivo expansion of human primary hepatocytes inside these animals and for exploring experimental gene therapy and cell-based therapies. Here, we report the generation of FAH knock-out rabbits via pronuclear stage embryo microinjection of transcription activator-like effector nucleases. FAH-/- rabbits exhibit phenotypic features of HT1 including liver and kidney abnormalities but additionally develop frequent ocular manifestations likely caused by local accumulation of tyrosine upon NTBC administration. We also show that allogeneic transplantation of wild-type rabbit primary hepatocytes into FAH-/- rabbits enables highly efficient liver repopulation and prevents liver insufficiency and death. Because of significant advantages over rodents and their ease of breeding, maintenance, and manipulation compared with larger animals including pigs, FAH-/- rabbits are an attractive alternative for modeling the consequences of HT1.

译文

遗传性酪氨酸血症1型 (HT1) 是一种严重的人类常染色体隐性遗传疾病,由延胡索乙酰乙酸羟化酶 (FAH) 缺乏引起,该酶催化酪氨酸降解途径的最后一步。缺乏FAH会导致血液和组织中有毒代谢产物 (富马酰乙酰乙酸酯和琥珀酰丙酮) 的积累,最终导致严重的肝脏和肾脏损害,发病范围从婴儿期到青春期。这种组织损伤是致命的,但可以通过施用2-(2-硝基-4-三氟甲基苯甲酰基)-1,3-环己二酮 (NTBC) 来控制,后者抑制了富马基乙酰乙酸酯和琥珀酰丙酮产生的酪氨酸分解代谢。值得注意的是,在缺乏FAH的动物中,NTBC的短暂戒断可用于诱导肝损伤和伴随的再生反应,从而刺激健康肝细胞的生长。除其他外,该模型对这些动物体内人类原代肝细胞的体内扩增以及探索实验性基因疗法和基于细胞的疗法引起了极大的兴趣。在这里,我们报告了通过原核阶段胚胎显微注射转录激活因子样效应核酸酶产生的FAH敲除兔。FAH-/-兔子表现出HT1的表型特征,包括肝脏和肾脏异常,但另外还出现了频繁的眼部表现,可能是由于NTBC给药后酪氨酸的局部积累所致。我们还显示,将野生型兔原代肝细胞同种异体移植到FAH-/-兔中,可实现高效的肝脏再增殖,并防止肝功能不全和死亡。由于与啮齿动物相比具有显着优势,并且与包括猪在内的大型动物相比,它们易于繁殖,维护和操纵,因此FAH-/-兔子是模拟ht1后果的有吸引力的替代方法。

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