Abstract
Reported pig induced pluripotent stem cells (piPSCs) have shown either a bFGF-dependent state with human embryonic stem cell (ESC) and mouse epiblast stem cell (EpiSC) morphology and molecular features or piPSCs exist in a LIF-dependent state and resemble fully reprogrammed mouse iPSCs. The features of authentic piPSCs and molecular events during the reprogramming are largely unknown. In this study, we assessed the transcriptome profile of multiple piPSC lines derived from different laboratories worldwide and compared to mouse and human iPSCs to determine the molecular signaling pathways that might play a central role in authentic piPSCs. The results demonstrated that the up-regulation of endogenous epithelial cells adhesion molecule (EpCAM) was correlated with the pluripotent state of pig pluripotent cells, which could be utilized as a marker for evaluating pig cell reprogramming. Comparison of key signaling pathways JAK-STAT, NOTCH, TGFB1, WNT and VEGF in pig, mouse and human iPSCs showed that the core transcriptional network to maintain pluripotency and self-renewal in pig were different from that in mouse, but had significant similarities to human. Pig iPSCs, which lacked expression of specific naïve state markers KLF2/4/5 and TBX3, but expressed the primed state markers of Otx2 and Fabp7, share defining features with human ESCs and mouse EpiSCs. The cluster of imprinted genes delineated by the delta-like homolog 1 gene and the type III iodothyronine deiodinase gene (DLK1-DIO3) were silenced in piPSCs as previously seen in mouse iPSCs that have limited ability to contribute to chimaeras. These key differences in naïve state gene and imprinting gene expression suggests that so far known piPSC lines may be more similar to primed state cells. The primed state of these cells may potentially explain the rare ability of piPSCS to generate chimeras and cloned offspring.
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Acknowledgments
We thank Dr. X. Lei (College of Animal Sciences, Zhejiang University, Hangzhou, China) for providing us pig iPS cell line iPF4-2. We also thank Dr. M. Roberts for allowing us to process the data from their lab. We thank S. Zhang, M. Qing and Y. Gao for their technical supports and comments. This work was supported by the National Basic Research Program of China (2011CBA01002) and the National Natural Science Foundation of China (No.31371505).
Conflict of Interest
The authors indicate no potential conflicts of interest. The authors have received research grants from the National Basic Research Program of China (2011CBA01002) and the National Natural Science Foundation of China (No.31371505).
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Liu, Y., Ma, Y., Yang, JY. et al. Comparative Gene Expression Signature of Pig, Human and Mouse Induced Pluripotent Stem Cell Lines Reveals Insight into Pig Pluripotency Gene Networks. Stem Cell Rev and Rep 10, 162–176 (2014). https://doi.org/10.1007/s12015-013-9485-9
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DOI: https://doi.org/10.1007/s12015-013-9485-9