Gary Ruvkun

Gary Ruvkun is a co-discoverer of microRNA and co-recipient of the 2024 Nobel Prize in Physiology or Medicine alongside Victor Ambros. His contribution was the discovery that let-7, a small regulatory RNA originally identified in C. elegans, is perfectly conserved from worms to humans — a finding that transformed the microRNA from a nematode curiosity into a universal principle of gene regulation with profound implications for cancer and development. Ruvkun's path to the Nobel Prize began with genetic studies of lin-14 in C. elegans, working in parallel with Ambros on the heterochronic pathway. Where Ambros discovered that lin-4 produces a small RNA, Ruvkun demonstrated the functional consequence: lin-4 RNA base-pairs with multiple sites in the lin-14 3' UTR to post-transcriptionally repress LIN-14 protein levels during larval development. This established the molecular mechanism of the first miRNA-target interaction and defined the paradigm of 3' UTR-mediated post-transcriptional repression that applies to all microRNAs. Ruvkun's landmark 2000 paper in Science reported the discovery of let-7, a second small regulatory RNA in C. elegans. Most critically, Ruvkun's team demonstrated that let-7 sequence is perfectly conserved in Drosophila, zebrafish, mouse, and human genomes, and that let-7 RNA is temporally expressed during development in all these organisms. This conservation meant that microRNAs are not worm-specific oddities but a universal regulatory mechanism embedded in all animal genomes. This single finding initiated the explosive growth of the miRNA field and focused attention on human microRNAs as cancer regulators. In cancer biology, let-7 family members are major tumor suppressors: let-7 targets multiple oncoproteins including RAS, HMGA2, MYC, and CDK6. Global downregulation of let-7 in lung cancer, breast cancer, and hepatocellular carcinoma correlates with poor prognosis. Ruvkun's work provided the conceptual framework for understanding miRNA-oncogene regulatory axes that are now extensively exploited in cancer research. Ruvkun has also made important contributions to understanding Argonaute protein biology — the catalytic engines of miRNA and RNAi silencing — and to mapping the target recognition rules that govern miRNA-mRNA interactions at a genome-wide scale. His laboratory continues to explore the evolutionary origins and functional logic of non-coding RNA regulatory networks.

Gary Ruvkun 是 microRNA 的共同发现者，与 Victor Ambros 共同获得2024年诺贝尔生理学或医学奖。他的关键贡献是发现 let-7——最初在线虫中鉴定的小调控 RNA——在从线虫到人类的进化中完全保守，这一发现将 microRNA 从线虫专有现象转变为具有普遍意义的基因调控原则。 他证明了 lin-4 RNA 通过与 lin-14 mRNA 3'非翻译区多个位点碱基配对来转录后抑制 LIN-14 蛋白——确立了第一个 miRNA-靶标相互作用的分子机制。2000年他报告了 let-7 的发现及其跨物种序列保守性，引发了 miRNA 领域的爆炸式增长。在癌症生物学中，let-7 家族成员是主要肿瘤抑制因子，靶向 RAS、HMGA2、MYC 等多个癌蛋白，其全局性下调与多种癌症的不良预后相关。