title: Single-cell RNA-seq reveals activation of unique gene groups as a consequence of stem cell-parenchymal cell fusion.
abstract: Fusion of donor mesenchymal stem cells with parenchymal cells of the recipient can occur in the brain, liver, intestine and heart following transplantation. The therapeutic benefit or detriment of resultant hybrids is unknown. Here we sought a global view of phenotypic diversification of mesenchymal stem cell-cardiomyocyte hybrids and associated time course. Using single-cell RNA-seq, we found hybrids consistently increase ribosome components and decrease genes associated with the cell cycle suggesting an increase in protein production and decrease in proliferation to accommodate the fused state. But in the case of most other gene groups, hybrids were individually distinct. In fact, though hybrids can express a transcriptome similar to individual fusion partners, approximately one-third acquired distinct expression profiles in a single day. Some hybrids underwent reprogramming, expressing pluripotency and cardiac precursor genes latent in parental cells and associated with developmental and morphogenic gene groups. Other hybrids expressed genes associated with ontologic cancer sets and two hybrids of separate experimental replicates clustered with breast cancer cells, expressing critical oncogenes and lacking tumor suppressor genes. Rapid transcriptional diversification of this type garners consideration in the context of cellular transplantation to damaged tissues, those with viral infection or other microenvironmental conditions that might promote fusion.
authors.affiliation: Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Stem Cell Institute, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Department of Biomedical Engineering, University of Wisconsin - Madison, Madison, WI 53706 USA.
authors.forename: Brian T
authors.initials: BT
authors.lastname: Freeman
authors.affiliation: Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Stem Cell Institute, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.
authors.forename: Jangwook P
authors.initials: JP
authors.lastname: Jung
authors.affiliation: Department of Biomedical Engineering, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Stem Cell Institute, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Department of Biomedical Engineering, University of Wisconsin - Madison, Madison, WI 53706 USA.|Masonic Cancer Center, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Lillehei Heart Institute, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.|Institute for Engineering in Medicine, University of Minnesota - Twin Cities, Minneapolis, MN 55455 USA.
authors.forename: Brenda M
authors.initials: BM
authors.lastname: Ogle
mesh_terms: D000818:Animals; D002459:Cell Fusion; D002478:Cells, Cultured; D006801:Humans; D045164:Mesenchymal Stem Cell Transplantation; D059630:Mesenchymal Stem Cells / Q000502:physiology*; D051379:Mice; D000072356:Parenchymal Tissue / Q000166:cytology; D017423:Sequence Analysis, RNA; D059010:Single-Cell Analysis; D015533:Transcriptional Activation; D059467:Transcriptome