MicroRNA Profiles of Four Induced Pluripotent Stem Cell Lines Derived from Distinct Tissues

This study examined the microRNA (miRNA) profiles of four induced pluripotent stem cell (iPSC) lines derived from different adult tissues: dermal fibroblasts, hair follicle keratinocytes, peripheral blood T cells, and exfoliated renal epithelial cells. Researchers found that 110 miRNAs were commonly expressed across all iPSC lines, accounting for 67.5–75.9% of the miRNAs in each line, while each line also had a small number of uniquely expressed miRNAs. The miRNA profiles of the iPSC lines were similar to each other but distinct from their mature cell origins and embryonic stem cells. The study identified 205 mature miRNAs expressed in at least one iPSC line, with the stem cell-specific miR-302a-3p highly expressed and the differentiation-specific miR-145-5p expressed at low levels. These findings suggest that iPSC lines, despite their different tissue origins, share a common miRNA expression profile, contributing to their pluripotent characteristics. The study's limitation is the use of only one iPSC line per cell type, indicating that further research with more lines could strengthen the conclusions.