Epigenetic Remodeling Increases Plasticity of Bovine Fibroblasts Without Improving Embryo and Stem Cell Development

GUSTC treatment of bovine fibroblasts reduces repressive heterochromatin marks (H3K9me2, H3K9me3, H3K27me3, HP1-alpha) while increasing H3K9 acetylation, without improving SCNT or stem-cell outcomes.

• Why it matters: Epigenetic memory and compensatory crosstalk among repressive marks can limit somatic cell reprogramming in cattle, making single-agent chromatin treatments inconsistent.
• What they did: Bovine fibroblasts were exposed to the multi-target GUSTC cocktail at optimized, non-cytotoxic concentrations, then assessed by immunofluorescence for histone/HP1-alpha changes and by SCNT for cleavage and blastocyst rates.
• The result: SCNT using GUSTC-treated donors did not significantly alter cleavage (83.6% vs. 92.2%; p = 0.15) or blastocyst rate (28.4% vs. 39.0%; p = 0.20), nor did it change ES line derivation efficiency (26.3% vs. 33.3%; p = 0.57) or OCT4/NANOG/SOX2 profiles.

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