单词	microRNA
释义	microRNA noun mi·​cro·​RNA ˌmī-krō-ˌär-(ˌ)en-ˈā  variants or less commonly micro-RNA genetics : a short segment of RNA that suppresses gene expression by binding to complementary segments of messenger RNA and interfering with the formation of proteins by translation (see translation sense 2) The 2006 Nobel Prize honored the discovery of RNA interference … and RNAi has helped shed light on the fact that cells naturally use RNA molecules just 20 to 22 nucleotides long, dubbed microRNAs, to regulate gene expression. Jennifer Couzin called also miRNA Word History First Known Use 2001, in the meaning defined above Medical Definition microRNA noun mi·​cro·​RNA ˌmī-krō-ˌär-en-ˈā  variants also micro-RNA : a short segment of RNA that suppresses gene expression by binding to complementary segments of messenger RNA and interfering with the formation of proteins during translation These microRNAs (miRNAs)—21 to 25 nucleotides in length—are negative regulators of gene expression. Paul S. Meltzer, Nature called also miRNA
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