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Rice-induced secondary metabolite gene expression in Aspergillus nidulans.

Christopher J Lacriola1, Shaun P Falk2, Bernard Weisblum2

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Researchers discovered that the plant hormone gibberellic acid, found in rice, activates silent fungal genes. This finding aids in discovering new natural products by understanding fungal biosynthesis regulation.

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Area of Science:

  • Fungal genomics and natural product discovery.
  • Plant-microbe interactions and biosynthesis regulation.

Background:

  • Activating silent biosynthetic gene clusters in fungi is crucial for discovering novel natural products.
  • Fungal secondary metabolite (SM) production is often regulated by environmental cues.

Purpose of the Study:

  • To identify triggers for silent gene clusters in Aspergillus nidulans.
  • To investigate the role of plant-derived compounds in regulating fungal SM biosynthesis.

Main Methods:

  • Induction of silent gene clusters in Aspergillus nidulans using rice (Oryza sativa) extracts.
  • Purification of rice extracts using reverse-phase High-Performance Liquid Chromatography (HPLC).
  • Transcriptomic profiling of A. nidulans in response to identified plant hormones.

Main Results:

  • Rice extracts induced specific silent secondary metabolite gene clusters in A. nidulans.
  • Gibberellic acid was identified as a key inducer from rice extracts.
  • Different plant hormones elicited distinct transcriptomic responses in A. nidulans.

Conclusions:

  • Phytohormones, such as gibberellic acid, play a significant role in regulating fungal secondary metabolite biosynthesis.
  • Plant-derived compounds can serve as valuable tools for activating silent fungal gene clusters, expanding natural product discovery.
  • Understanding these interactions facilitates the exploration of fungal chemical diversity for novel compounds.