MicroRNAs and tRNA-Derived Small Fragments: Key Messengers in Nuclear-Mitochondrial Communication

Area of Science:

• Cell Biology
• Molecular Biology
• Genetics

Background:

• Mitochondria, originating from endosymbiotic α-proteobacteria, are crucial for cellular energy and survival.
• Complex signaling pathways mediate the symbiotic relationship between mitochondria and the host cell nucleus.
• Mechanisms of mitochondria-nucleus communication remain incompletely understood.

Purpose of the Study:

• To review the emerging roles of small non-coding RNAs (sncRNAs) in mitochondria-nucleus cross-talk.
• To highlight the interrelation of microRNAs (miRNAs) and tRNA-derived small fragments in cellular signaling.
• To explore how sncRNA dysregulation contributes to mitochondrial dysfunction diseases.

Main Methods:

• Literature review of recent findings on sncRNAs and mitochondria-nucleus communication.
• Analysis of signaling pathways involving miRNAs and tRNA fragments.
• Examination of disease mechanisms linked to altered mitochondrial signaling.

Main Results:

• Two classes of sncRNAs, miRNAs and tRNA-derived fragments, are identified as critical mediators of mitochondria-nucleus communication.
• These sncRNAs participate in diverse signaling pathways, influencing cellular adaptation and survival.
• Alterations in sncRNA-mediated regulatory mechanisms are associated with diseases stemming from mitochondrial dysfunction.

Conclusions:

• sncRNAs play a vital role in maintaining the mitochondria-nucleus symbiotic relationship.
• Dysfunctional sncRNA signaling contributes to pathogenesis of mitochondrial diseases.
• These sncRNAs represent promising candidates for prognostic biomarkers and therapeutic targets.