Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2021 Aug 23;21:445. doi: 10.1186/s12935-021-02144-y

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

PMC Copyright notice

Fig. 1 — Biogenesis of miRNAs. In the nucleus, the miRNA gene is transcribed into a pri-miRNA by RNA polymerase II, and then pri-miRNAs are cleaved to pre-miRNAs by RNase III Drosha. Pre-miRNAs are transferred from the nucleus to the cytoplasm by XPO5. In the cytoplasm, pre-miRNAs are further processed to mature double-stranded miRNAs by Dicer. The mature double-stranded miRNAs unwind, and then one of the strands is degraded and the other is integrated into the RISC, which then guides it to the target mRNA. In addition, miRNAs can be secreted and regulate target gene expression via the exosomal pathway