Identifying Candidate Reprogramming Genes in Mouse Induced Pluripotent Stem Cells

Area of Science:

• Stem Cell Biology
• Regenerative Medicine
• Epigenetics

Background:

• Factor-based induced reprogramming holds promise for regenerative medicine but suffers from low efficiency.
• Understanding the transcriptional differences between induced pluripotent stem cells (iPSCs) and embryonic stem cells (ESCs) is crucial for improving reprogramming outcomes.
• Global transcriptional profiling provides insights into the molecular mechanisms underlying pluripotency and reprogramming.

Purpose of the Study:

• To analyze and compare global transcriptional profiles of mouse induced pluripotent stem cells (miPSCs) and mouse embryonic stem cells (mESCs) from multiple laboratories.
• To identify differentially expressed genes (DEs) associated with pluripotency and to define consensus DEs contributing to differences between miPSCs and mESCs.
• To investigate the correlation between specific gene expression patterns, oocyte-enriched factors, and the efficiency of reprogramming.

Main Methods:

• Comparative analysis of global transcriptional profiles from miPSCs and mESCs sourced from seven different laboratories.
• Identification of differentially expressed genes (DEs) by comparing pluripotent stem cells (PSCs) with somatic cells and comparing miPSCs with mESCs.
• Network analysis to identify hub genes and correlation analysis with oocyte-enriched factors.

Main Results:

• Successful clustering of PSCs by cell type, independent of the laboratory of origin.
• Identification of 2131 DEs as candidate pluripotency genes and 720 DEs between miPSCs and mESCs, with significant overlap.
• miPSCs showed incomplete silencing of somatic cell expression patterns and failed to fully induce mESC-specific genes, with 86% of miPSC-specific genes highly expressed in somatic cells.
• A strong correlation was found between oocyte-enriched factors and insufficiently induced mESC-specific genes.
• Eleven key hub genes were identified through network analysis.

Conclusions:

• Significant transcriptional differences exist between miPSCs and mESCs, impacting reprogramming efficiency and quality.
• Incomplete silencing of somatic gene expression and failure to induce key pluripotency genes contribute to reprogramming inefficiencies.
• The identified hub genes, potentially influenced by oocyte-enriched factors, may serve as targets to enhance somatic cell nuclear transfer (SCNT) reprogramming and improve miPSC quality.