Abstract
Endophytes that represent a sub-set of plant resident microbes are a reservoir of bioactive metabolites. Many of the secondary metabolite biosynthetic gene clusters of endophytes are silent under axenic culture conditions. Epigenetic reprogramming of such cryptic pathways is possible by use of small molecule modulators like prednisone. Methylation changes induced by prednisone, a hypomethylating epigenetic modulator were studied in endophytic Fusarium oxysporum. CRED-RA analysis following exposure to non-cytotoxic dose (300µM) revealed prednisone as effective in inducing non-methylation and semi-methylation pattern while inhibiting full-methylation of the genome. Effectiveness of prednisone as a DNA methyl transferase inhibitor can be explored in future to study alterations in secondary metabolite gene expression profile in endophytic F. oxysporum.
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