Novel small molecules potentiate premature termination codon readthrough by aminoglycosides
作者:Alireza Baradaran-Heravi、Aruna D. Balgi、Carla Zimmerman、Kunho Choi、Fahimeh S. Shidmoossavee、Jason S. Tan、Célia Bergeaud、Alexandra Krause、Stéphane Flibotte、Yoko Shimizu、Hilary J. Anderson、Vincent Mouly、Eric Jan、Tom Pfeifer、James B. Jaquith、Michel Roberge
DOI:10.1093/nar/gkw638
日期:2016.8.19
Nonsense mutations introduce premature termination codons and underlie 11% of genetic disease cases. High concentrations of aminoglycosides can restore gene function by eliciting premature termination codon readthrough but with low efficiency. Using a high-throughput screen, we identified compounds that potentiate readthrough by aminoglycosides at multiple nonsense alleles in yeast. Chemical optimization generated phthalimide derivative CDX5-1 with activity in human cells. Alone, CDX5-1 did not induce readthrough or increase TP53 mRNA levels in HDQ-P1 cancer cells with a homozygous TP53 nonsense mutation. However, in combination with aminoglycoside G418, it enhanced readthrough up to 180-fold over G418 alone. The combination also increased readthrough at all three nonsense codons in cancer cells with other TP53 nonsense mutations, as well as in cells from rare genetic disease patients with nonsense mutations in the CLN2, SMARCAL1 and DMD genes. These findings open up the possibility of treating patients across a spectrum of genetic diseases caused by nonsense mutations.
无义突变引入过早终止密码子,并构成了11%的遗传疾病病例。高浓度的氨基糖苷类药物可以通过诱发过早终止密码子通读来恢复基因功能,但效率较低。通过高通量筛选,我们鉴定出能够增强氨基糖苷类药物在酵母中多种无义等位基因上通读效果的化合物。通过化学优化,生成了在人体细胞中具有活性的酞酰亚胺衍生物CDX5-1。单独使用CDX5-1并未在带有纯合TP53无义突变的HDQ-P1癌细胞中诱导通读或增加TP53 mRNA水平。然而,与氨基糖苷类药物G418联合使用时,它将通读效果提高了180倍,超过单独使用G418的效果。这种组合还提高了具有其他TP53无义突变的癌细胞中所有三种无义密码子的通读效果,以及来自罕见的遗传疾病患者细胞中CLN2、SMARCAL1和DMD基因的无义突变。这些发现为治疗由无义突变引起的多种遗传疾病开辟了可能性。