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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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在癌症中合成mRNA质量控制复合物的致死性

Vivian Prindle1, Adam E Richardson1, Kimberly R Sher1

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概括

合成致死性发现了新的癌症点. 通过利用癌细胞的脆弱性,向PELO-HBS1L和SKI复合体抑制瘤生长.

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科学领域:

  • 癌症学
  • 分子生物学
  • 癌症遗传学

背景情况:

  • 合成致死性是一种精确的癌症治疗策略.
  • PARP 抑制剂是合成致死性的成功例子.
  • 一些新目标正在临床试验中.

研究的目的:

  • 确定人类癌症中的新型合成致命相互作用.
  • 在mRNA质量控制途径中研究PELO-HBS1L和SKI复合物的相互作用.
  • 确定针对这种相互作用的治疗潜力.

主要方法:

  • 分析不同的遗传背景,包括9p21.3删除和高微卫星不稳定性 (MSI-H) 瘤.
  • 对PELO-HBS1L和SKI复合体相互作用的描述.
  • 细胞周期变化和未折叠蛋白质反应激活的评估.

主要成果:

  • 在PELO-HBS1L和SKI复合体之间发现了一种新型的合成致命相互作用.
  • 在特定的瘤类型中,SKI复合物的不稳定导致对PELO-HBS1L核糖体救援复合物的依赖.
  • 这种合成致死性通过IRE1激活了未折叠的蛋白质反应,并抑制了瘤的生长.

结论:

  • 在癌症中,PELO和HBS1L是潜在的新型治疗点.
  • 这种SKI复合物不稳定是这种合成杀伤性的生物标志物.
  • 这种方法针对不同遗传背景的大量患者.