Dynamic expression of tRNA-derived small RNAs define cellular states

Area of Science:

• Molecular Biology
• Stem Cell Biology
• RNA Biology

Background:

• Transfer RNA-derived small RNAs (tsRNAs) are emerging regulators of protein translation with diverse biological functions.
• The precise mechanisms of tsRNA action during dynamic cell-state transitions are not fully understood.

Purpose of the Study:

• To investigate the role and mechanisms of tsRNAs in cell-state transitions, specifically focusing on mouse embryonic stem cells (mESCs).
• To identify specific tsRNAs involved in stem cell differentiation and elucidate their molecular interactions.

Main Methods:

• Comparative expression analysis of tsRNAs in distinct cell states (stem vs. differentiated).
• Interactome studies to identify binding partners of differentially expressed tsRNAs.
• Functional assays to assess the impact of tsRNAs on target gene stability and translation.

Main Results:

• A subset of 5 omino-tsRNAs was found to be upregulated during the differentiation of mESCs.
• tsRNAs exhibited state-dependent switching in their association with RNA-binding proteins (RNPs) and messenger RNAs (mRNAs).
• Specific 5 omino-tsRNAs were shown to interact with Igf2bp1 in differentiated cells, affecting the stability and translation of c-Myc mRNA.

Conclusions:

• 5 omino-tsRNAs play a significant role in defining distinct cell states during differentiation.
• tsRNAs modulate stem cell states by influencing the stability and translation of key regulatory factors like c-Myc through interactions with RNA-binding proteins.