The Pol III transcriptome: Basic features, recurrent patterns, and emerging roles in cancer

Area of Science:

• Molecular Biology
• RNA Biology
• Cancer Research

Background:

• The RNA polymerase III (Pol III) transcriptome consists of short, structured noncoding RNAs (ncRNAs) essential for fundamental cellular processes.
• These ncRNAs mediate functions including gene regulation, RNA processing, protein targeting, and translation, involving crucial RNA-protein interactions.
• Higher eukaryotes exhibit an expanded Pol III transcriptome with newly evolved ncRNAs regulating autophagy, immunity, and translation.

Purpose of the Study:

• To review the fundamental features and functions of the Pol III transcriptome.
• To examine the dysregulation and dysfunction of individual ncRNAs within the Pol III transcriptome in the context of cancer.
• To identify common patterns and mechanisms underlying the role of the Pol III transcriptome in cancer progression.

Main Methods:

• Literature review of existing research on RNA polymerase III transcription.
• Analysis of functional roles of various ncRNAs transcribed by Pol III.
• Examination of evidence linking Pol III ncRNAs to cancer development and patient outcomes.

Main Results:

• Pol III transcription is frequently upregulated in cancer, with specific ncRNAs associated with disease progression and survival.
• Newly evolved ncRNAs contribute to broader cellular functions, including autophagy and immune signaling.
• Emerging patterns in cancer include shared functional motifs like molecular scaffolding, protein sequestration, and immunostimulatory activities.

Conclusions:

• The Pol III transcriptome plays a multifaceted role in cancer, extending beyond basic cellular functions.
• Dysregulation of Pol III ncRNAs contributes significantly to cancer progression and impacts patient survival.
• Understanding these ncRNAs offers potential therapeutic targets and insights into cancer biology.