Scientists are shedding new light on a little-known biological system that could help unlock the full potential of stem cell therapy, one of the most promising areas of modern medicine. A new review highlights the growing importance of PIWI proteins and PIWI-interacting RNAs (piRNAs), a specialized class of small RNA molecules that play a central role in controlling how stem cells maintain their identity, repair tissues, and develop into specialized cell types.
Stem cell-based treatments have generated significant interest for their ability to restore damaged tissues and potentially address conditions ranging from degenerative diseases to cancer. However, the success of these therapies depends on precise control of gene activity inside cells. The review explores how PIWI/piRNA complexes act as powerful regulators of this process through epigenetic regulation, the biological mechanisms that switch genes on or off without changing the underlying DNA sequence.
The PIWI/piRNA system helps safeguard the genome by suppressing harmful genetic elements known as transposons, which can destabilize DNA and disrupt normal cellular function. At the same time, these molecular complexes influence critical processes including chromatin remodeling, DNA methylation, gene expression, and cellular differentiation. By coordinating these activities, they help stem cells preserve their regenerative capacity while also guiding them toward specific developmental pathways when needed.
The review also highlights the expanding relevance of PIWI/piRNA biology beyond reproductive tissues. These molecules have now been identified in a variety of somatic cell types, where they contribute to tissue maintenance, cellular repair, and disease-related processes. Their influence has attracted growing attention in areas such as cancer biology, bone regeneration, neurodegenerative disorders, and age-related tissue decline.
Particularly notable is the potential of PIWI/piRNA pathways as both biomarkers and therapeutic targets. In cancer, abnormal PIWI/piRNA activity has been linked to the maintenance of cancer stem cells, treatment resistance, and tumor progression. In skeletal disorders, specific piRNAs appear to regulate bone formation and may offer new opportunities to support regeneration and combat bone loss. Emerging evidence also points to roles in neural stem cell function and healthy aging.
Despite this promise, important challenges remain before PIWI/piRNA-based therapies can reach routine clinical use. Key obstacles include improving targeting accuracy, enhancing molecular stability, and ensuring long-term safety. Advances in gene delivery technologies, biomaterials, artificial intelligence-driven target discovery, and next-generation molecular engineering are expected to accelerate progress in this field.
# # # # # #
Genes & Diseases publishes rigorously peer-reviewed and high quality original articles and authoritative reviews that focus on the molecular bases of human diseases. Emphasis is placed on hypothesis-driven, mechanistic studies relevant to pathogenesis and/or experimental therapeutics of human diseases. The journal has worldwide authorship, and a broad scope in basic and translational biomedical research of molecular biology, molecular genetics, and cell biology, including but not limited to cell proliferation and apoptosis, signal transduction, stem cell biology, developmental biology, gene regulation and epigenetics, cancer biology, immunity and infection, neuroscience, disease-specific animal models, gene and cell-based therapies, and regenerative medicine.
Scopus CiteScore: 10.4 |Impact Factor:14.6
# # # # # #
More information: https://www.keaipublishing.com/en/journals/genes-and-diseases/
Editorial Board: https://www.keaipublishing.com/en/journals/genes-and-diseases/editorial-board/
All issues and articles in press are available online in ScienceDirect (https://www.sciencedirect.com/journal/genes-and-diseases).
Submissions to Genes & Diseases may be made using Editorial Manager (https://www.editorialmanager.com/gendis/default.aspx).
Print ISSN: 2352-4820
eISSN: 2352-3042
CN: 50-1221/R
Contact Us: editor@genesndiseases.cn
X (formerly twitter): @GenesNDiseases (https://x.com/GenesNDiseases)
# # # # # #
Reference
Ying Yang, Xiangping Luo, Ermao Li, Zhengmao Li, Feiyan Zou, Jiayang Liao, Yizhi Wu, Bo Wei, Unraveling the role of PIWI/piRNAs in stem cell therapy: Epigenetic mechanisms and therapeutic potentials, Genes & Diseases, Volume 13, Issue 5, 2026, 101854, https://doi.org/10.1016/j.gendis.2025.101854

Funding
Key Fund Project of Hunan Provincial Department of Education (China) 23A0340
General Guidance Project of Hunan Provincial Health Commission of China 202104072014
Hunan University Students Innovation and Entrepreneurship Training Program Project (China) D202405231300501291
Hunan University Students Innovation and Entrepreneurship Training Program Project (China) D202405232303034450
Hunan Provincial Natural Science Foundation (China) 2023JJ50098
National Natural Science Foundation of China 82303122