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Epigenetic manipulation of gene expression in Chaetomium indicum using a HDAC inhibitor led to the isolation of structurally diverse chaetophenols, and 3, 4 and 5 bear unprecedented polycyclic skeletons. The expression of two silent genes (pksCH-1 and pksCH-2) for nonreducing PKSs involved in chaetophenol biosynthesis was associated with an increase of histone acetylation level. The heterologous gene expression study in Aspergillus oryzae revealed pksCH-2 to be the NR-PKS gene for 8.
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Asai et al. (2013) studied this question.
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