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RNA uridyl transferases TUT4/7 differentially regulate miRNA variants depending on the cancer cell type
Ragini Medhi1,2, Jonathan Price2, Giulia Furlan2
1Department of Genetics, University of Cambridge, Cambridge CB2 3EH, United Kingdom.
RNA (New York, N.Y.)
|December 24, 2021
Summary
Targeting terminal uridyl transferases TUT4/7 offers potential cancer therapy by disrupting miRNA uridylation, which affects cancer cell properties and gene expression. This study reveals cell-type-specific miRNA regulation by TUT4/7.
Area of Science:
- * Molecular Biology
- * Cancer Research
- * RNA Biology
Background:
- * Terminal uridyl transferases TUT4 and TUT7 (TUT4/7) add uridines to RNA 3' ends.
- * TUT4/7, recruited by LIN28A, down-regulates tumor suppressor miRNA let-7, inhibiting tumorigenesis.
- * Targeting TUT4/7 presents a potential anticancer therapy strategy.
Purpose of the Study:
- * Investigate TUT4/7-mediated RNA regulation in cancer cell lines.
- * Establish catalytic knockout models to study TUT4/7 function.
- * Analyze the impact of TUT4/7 disruption on miRNA modification and cancer cell properties.
Main Methods:
- * Creation of catalytic knockout models for TUT4/7 in cancer cell lines.
- * Measurement of miRNA uridylation levels.
- * Assessment of cancer cell proliferation and migration.
- * Analysis of miRNA and mRNA expression profiles.
- * Investigation of cell-type-specific miRNA regulation.
Main Results:
- * TUT4/7 mutation significantly reduced miRNA uridylation.
- * Loss of TUT4/7 activity impaired cancer cell proliferation and migration.
- * Uridylated miRNA variants were replaced by adenylated isomiRs upon TUT4/7 loss.
- * TUT4/7-mediated miRNA regulation is largely LIN28A-independent for most miRNAs.
- * Identified cell-type-specific miRNA clusters regulated by TUT4/7, affecting mRNA targets like BCL2.
- * miR-200c-3p and miR-141-3p expression are TUT4/7-regulated in a cancer-specific manner.
Conclusions:
- * TUT4/7 loss leads to deregulation of miRNA-mRNA networks in a cell-type-specific manner.
- * Understanding cell-type-specific deregulation is crucial for developing TUT4/7-targeted cancer therapies.
- * Altered miRNA modification profiles, including isomiR changes, accompany expression deregulation.
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