MicroRNA characterization in equine induced pluripotent stem cells

Area of Science:

• Stem Cell Biology
• Molecular Biology
• Comparative Genomics

Background:

• Cell reprogramming is established in human and mouse models.
• Limited information exists on induced pluripotent stem cells (iPSCs) in domestic animals.
• MicroRNAs are critical for maintaining pluripotency and directing cell differentiation.

Purpose of the Study:

• To generate and characterize equine iPSCs.
• To analyze the expression of specific microRNAs in equine iPSCs and their differentiated progeny.
• To compare microRNA expression in equine pluripotent cells with human counterparts.

Main Methods:

• Reprogramming equine fibroblasts using human Yamanaka factors (OCT-4/SOX-2/c-MYC/KLF4).
• Assessing pluripotency via alkaline phosphatase activity, RT-PCR for OCT-4, NANOG, REX1, and immunofluorescence for OCT-4, SOX-2, c-MYC.
• In vitro differentiation into embryoid bodies (EBs) to evaluate differentiation potential.
• MicroRNA expression profiling using RT-PCR and in silico target gene analysis.

Main Results:

• Two equine iPSC lines (L2, L3) were successfully generated and characterized.
• Equine iPSCs exhibited pluripotency markers and differentiated into ectodermal, endodermal, and mesodermal lineages.
• Upregulation of miR-302 family, miR-9, and miR-96, and downregulation of miR-145 and miR-205 were observed in iPSCs compared to fibroblasts.
• Post-differentiation, miR-96 expression increased in EBs, and miR-205 was induced in EB-L2.
• In silico analysis suggested conserved roles for equine microRNAs in regulating cell cycle, epithelial-mesenchymal transition, neural development, and pluripotency genes.

Conclusions:

• Successfully generated and characterized the first equine induced pluripotent stem cells.
• Identified key microRNA expression profiles in equine pluripotent cells, mirroring human patterns.
• These findings provide a foundation for understanding pluripotency and differentiation in domestic animal stem cells.