# RNAa-Mediated Gene Activation in the Regulation of Stem Cell Fate

## TL;DR

This paper reviews how RNA molecules can activate genes to control stem cell behavior, offering a new way to influence cell fate through epigenetic changes.

## Contribution

The paper provides a comprehensive review of RNAa mechanisms and their role in stem cell regulation, emphasizing their potential for precise cell fate control.

## Key findings

- RNAa involves both synthetic and endogenous RNA molecules that activate gene expression in stem cells.
- RNAa modulates chromatin accessibility and transcriptional machinery to regulate stem cell pluripotency and differentiation.
- RNAa is an evolutionarily conserved mechanism with potential for epigenetic-based cell fate manipulation.

## Abstract

Stem cell fate is governed by complex transcriptional networks and dynamic chromatin architectures, with RNA molecules acting as critical regulators. Traditionally, small RNAs have been associated with gene silencing; however, growing evidence reveals that certain RNA species can also activate transcription, a phenomenon termed RNA activation (RNAa). This evolutionarily conserved mechanism functions through both synthetic small activating RNAs (saRNAs) and endogenous RNA molecules, including promoter-targeting microRNAs, small modulatory double-stranded RNAs, and circular RNAs. By modulating chromatin accessibility and engaging the transcriptional machinery, these RNAs orchestrate gene expression programs that control pluripotency maintenance and lineage-specific differentiation in stem cells. This review integrates emerging mechanistic insights and functional evidence to provide a comprehensive perspective on RNAa-mediated gene activation in stem cell biology and highlights its potential as a precise tool for controlling cell fate through epigenetic modulation.