Bovine Somatic Cell Reprogramming

The DOT1L inhibitor EPZ004777 (iDOT1L) was purchased from AOBIOUS Inc. (Gloucester, MA, USA). WNT inhibitor IWR1, GSK-3 inhibitor CHIR-99021, MEK inhibitor PD0325901, ROCK inhibitor Y-27632 (ROCKi), and caspase inhibitor Z-VAD-FMK were purchased from Selleckchem (Houston, TX, USA). Forskolin was purchased from Fisher Scientific (Pittsburg, PA, USA). Human reprogramming factors OCT4, SOX2, KLF4, MYC, NANOG, LIN28A, and KDM4A were used for bovine somatic cell reprogramming. The constructs pMXs-OCT4, FUW-TetO-eGFP, and FUW-m2rtTA were purchased from Addgene (Cambridge, MA, USA). Construction of the polycistronic vector pMXs-KLF4, MYC, and SOX2 (KMS) [68 (link)] and pMXs-LIN28A and NANOG (LN) [30 (link)] were described previously. Human KDM4A was cloned into pMXs-vector similarly to as previously described in [30 (link)]. Primary bovine umbilical cord-derived mesenchymal stem cells (bMSCs) were collected from Wharton’s jelly part of the placenta of a newborn male Holstein calf, and were maintained with low serum MSC medium (ATCC, Manassas, VA, USA).