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Silent Guardians Gone Rogue: The Role of PIWI and piRNA in Malignant Transformation

Anthony Lalruatfela¹, Priyajit Biswal¹, Subham Kumar Behera¹

¹RNAi Laboratory, Department of Life Science, National Institute of Technology Rourkela, Rourkela, Odisha, India.

|November 15, 2025

Abstract:

Malignant transformation is not merely the consequence of stochastic genetic mutations but rather a convergence of complex interplay between genetic, epigenetic, and environmental factors that collectively reprogram normal cells into cancerous ones. Central to these processes is the loss of tumor suppressor genes, activation of oncogenes, chromosomal instability, and widespread epigenetic remodeling. A pivotal aspect of this transformation involves the contribution of ncRNAs that have been recurrently implicated in malignant transformation. While much attention is directed toward miRNAs, circRNAs, and lncRNAs, piRNAs have remained comparatively overlooked in cancer biology. This is despite a growing body of evidence implicating piRNAs in regulating tumorigenic pathways, genomic stability, and epigenetic gene silencing. Our review explores the emerging role of the piRNAs and their regulatory protein PIWI in modulating key malignant features, including hyperproliferation, EMT, tumor evasion, migration, angiogenesis, and others. We also examine how this axis influences the initiation and progression of cancer, highlighting its potential to reshape established paradigms in cancer studies.

Insights

Piwi-interacting RNAs (piRNAs) and their PIWI proteins are crucial in cancer development by regulating cell proliferation, migration, and epigenetic silencing. This review highlights their overlooked role in malignant transformation and cancer progression.

Area of Science:

Molecular Biology
Cancer Biology
Epigenetics

Background:

Malignant transformation involves genetic, epigenetic, and environmental factors reprogramming normal cells.
Key processes include oncogene activation, tumor suppressor loss, and epigenetic remodeling.
Non-coding RNAs (ncRNAs) are implicated, but piRNAs are less studied than miRNAs, circRNAs, and lncRNAs.

Purpose of the Study:

To explore the emerging role of piRNAs and PIWI proteins in cancer.
To review piRNA involvement in tumorigenic pathways, genomic stability, and epigenetic gene silencing.
To highlight the piRNA-PIWI axis's influence on cancer initiation and progression.

Main Methods:

Literature review of piRNA research in cancer biology.
Analysis of piRNA involvement in key malignant features.
Examination of the piRNA-PIWI axis in cancer development.

Main Results:

PiRNAs are implicated in regulating hyperproliferation, epithelial-mesenchymal transition (EMT), tumor evasion, migration, and angiogenesis.
The piRNA-PIWI axis plays a significant role in modulating these tumorigenic features.
Evidence suggests piRNAs are involved in genomic stability and epigenetic gene silencing.

Conclusions:

PiRNAs and PIWI proteins represent a critical, yet underappreciated, component of malignant transformation.
Understanding the piRNA-PIWI axis offers potential for novel cancer therapeutic strategies.
This axis could reshape established paradigms in cancer research and treatment.

Read full analysis

Keywords:

PIWI cancer genomic instability malignant transformation ncRNA piRNA tumorigenesis

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