Transcription Factor Rational Design Improves Directed Differentiation of Human Mesenchymal Stem Cells into Skeletal Myocytes
Overview
Pharmacology
Authors
Affiliations
There is great interest in transdifferentiating cells from one lineage into those of another and in dedifferentiating mature cells back into a stem/progenitor cell state by deploying naturally occurring transcription factors (TFs). Often, however, steering cellular differentiation pathways in a predictable and efficient manner remains challenging. Here, we investigated the principle of combining domains from different lineage-specific TFs to improve directed cellular differentiation. As proof-of-concept, we engineered the whole-human TF MyoDCD, which has the NH(2)-terminal transcription activation domain (TAD) and adjacent DNA-binding motif of MyoD COOH-terminally fused to the TAD of myocardin (MyoCD). We found via reporter gene and marker protein assays as well as by a cell fusion readout system that, targeting the TAD of MyoCD to genes normally responsive to the skeletal muscle-specific TF MyoD enforces more robust myogenic reprogramming of nonmuscle cells than that achieved by the parental, prototypic master TF, MyoD. Human mesenchymal stem cells (hMSCs) transduced with a codon-optimized microdystrophin gene linked to a synthetic striated muscle-specific promoter and/or with MyoD or MyoDCD were evaluated for complementing the genetic defect in Duchenne muscular dystrophy (DMD) myocytes through heterotypic cell fusion. Cotransduction of hMSCs with MyoDCD and microdystrophin led to chimeric myotubes containing the highest dystrophin levels.
Continuous directed evolution of a compact CjCas9 variant with broad PAM compatibility.
Schmidheini L, Mathis N, Marquart K, Rothgangl T, Kissling L, Bock D Nat Chem Biol. 2023; 20(3):333-343.
PMID: 37735239 PMC: 7616171. DOI: 10.1038/s41589-023-01427-x.
Gorji A, Ostaszewski P, Urbanska K, Sadkowski T Biomedicines. 2023; 11(8).
PMID: 37626825 PMC: 10452677. DOI: 10.3390/biomedicines11082329.
Efficacy and muscle safety assessment of fukutin-related protein gene therapy.
Benasutti H, Maricelli J, Seto J, Hall J, Halbert C, Wicki J Mol Ther Methods Clin Dev. 2023; 30:65-80.
PMID: 37361354 PMC: 10285450. DOI: 10.1016/j.omtm.2023.05.022.
Rodgers B, Herring S, Carias D, Chen J, Rocha A Mol Ther Methods Clin Dev. 2023; 29:494-503.
PMID: 37273901 PMC: 10236005. DOI: 10.1016/j.omtm.2023.05.007.
Single-swap editing for the correction of common Duchenne muscular dystrophy mutations.
Chai A, Chemello F, Li H, Nishiyama T, Chen K, Zhang Y Mol Ther Nucleic Acids. 2023; 32:522-535.
PMID: 37215149 PMC: 10192335. DOI: 10.1016/j.omtn.2023.04.009.