Why are imprints unstable in pluripotent stem cells?

Area of Science:

• Stem cell biology
• Epigenetics
• Developmental biology

Background:

• Pluripotent stem cells (PSCs) are crucial for regenerative medicine and disease modeling due to their self-renewal and differentiation capabilities.
• PSCs exhibit genetic and epigenetic instabilities, with epigenetic defects, particularly genomic imprinting errors, often overlooked.
• Genomic imprinting errors can lead to developmental disorders and compromise the safety and reliability of PSC-derived therapies.

Purpose of the Study:

• To review the origins and consequences of genomic imprinting defects in pluripotent stem cells (PSCs).
• To discuss current strategies for correcting imprinting errors in PSCs.
• To highlight the importance of addressing imprinting stability for safe and effective PSC applications.

Main Methods:

• Literature review of studies on genomic imprinting in mouse and human PSCs.
• Analysis of the impact of imprinting defects on PSC differentiation and therapeutic potential.
• Evaluation of emerging correction strategies for imprinting instability.

Main Results:

• Genomic imprinting errors are recurrent in PSCs and persist throughout differentiation.
• These errors can arise from various factors and have significant implications for PSC-derived cell therapies.
• Established methods for monitoring genetic stability in PSCs do not adequately address epigenetic imprinting defects.

Conclusions:

• Imprinting defects in PSCs pose a significant challenge for their clinical application.
• Developing robust methods to detect and correct imprinting errors is essential for advancing regenerative medicine.
• Enhancing imprinting stability in PSCs is critical for ensuring the safety and efficacy of future stem cell-based therapies.