1.和siRNA一样装载成RISC(RNA induced silencing complex , RISC;沉默复合物)后互补配对的mRNA降解; 2.miRNA可抑制mRNA的翻译,降低靶基因的蛋白质水平但不影响期mRNA的水平。 三、lncRNA(long non-coding RNA) IncRNA的长度一般大于200bp。根据基因组位点或相关的DNA特征,可以进一步进行分类(图4): 图4 长链非...
然而,lncRNA在大小上存在显著差异,==长度超过10 kb的lncRNA属于超长基因间RNA (very long intergenic RNAs, vlinc)和宏观lncRNA==。这些转录本具有一些区别于其他lncRNA的特征:它们的剪接性差或不剪接,在3 '端弱聚腺苷酸化,并且由特定的基因组位点产生。大多数vlincRNA都位于同一条或相反的链上的PCG(蛋白编码...
ciRNAs的形成依赖于侧翼RNA元件。侧翼RNA元件可能对内含子脱支成套非常重要。研究发现一些ciRNAs定位在细胞核中,可以与PolⅡ结合通过cis 作用模式调控宿主的转录活性。研究发现一类叫做EIciRNA的环状RNA与RNA PolⅡ关系密切。比如circEIF3J 和circPAIP2,定位在细胞核,与U1小核核糖核蛋白(snRNPs)结合,通过cis-ac...
Non-codingRNA:Versatilityinformandfunction NoncodingRNAgenesaresurprisinglynumerous.NoncodingRNAhaveaverydifferentfunctions.TimeforRNomics Cell,89:669–672,May30,1997 PNAS,97(26):14035-14037,Dec19,2000 UnderstandingRNomicsfromanexpendingsnoRNAworld CouzinJ.Breakthroughoftheyear.SmallRNAsmakebigsplash.Science...
1、微小RNA(microRNA, miRNA) miRNA是短ncRNA,约为22～23个核苷酸,其编码基因由RNA多聚酶Ⅱ转录,通过与mRNA 3′端非翻译区(3′ untranslated region, 3′UTR)之间的结合调控mRNA的表达,超过60%的编码基因是miRNA的潜在调控靶点。 2、长链非编码RNA(long non-coding RNA, lncRNA) ...
Non-codingRNA(ncRNA)isaRNAmoleculethatfunctionsw/obeingtranslatedintoaprotein Mostprominentexamples:TransferRNA(tRNA),RibosomalRNA(rRNA) WhyNon-codingRNA Protein-codinggenescan’taccountforallcomplexity ncRNAisimportant!Generegulators QuickTime?andaTIFF(Uncompressed)decompressorareneededtoseethispicture....
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Classical examples of non-coding RNAs include ribosomal RNAs and tRNAs, which represent 90% and 15% of the total RNA content of a typical mammalian cell, respectively. Additional types of non-coding RNAs, which have been shown to play both regulatory and signaling roles, were discovered in ...
non-coding rna名词解释non-coding rna名词解释 非编码RNA(non-coding RNA,ncRNA)指的是在转录成RNA时不被翻译成蛋白质的RNA分子。与编码蛋白质的mRNA相比,ncRNA的功能非常多样,包括调控基因表达、RNA的剪接和稳定性、染色体转录后修饰等。非编码RNA是生物学研究领域中的一个热门话题,对于揭示细胞及多细胞生命现象的...
Noncoding RNAs, by definition, do not become translated into protein. This broad category includes cellular RNAs that range in size from 20 to 20,000 nucleotides, can contain chemical modifications, adopt a wide variety of secondary and tertiary structures, associate with proteins and other RNA ...