Comparative transcriptome analysis reveals key genes responsible for the differences in polyphyllin composition in
Zhun Xie1, Hongya Yu1, Shoujie Peng1
1College of Traditional Chinese Medicine, Yunnan University of Chinese Medicine, Kunming, Yunnan, China.
Gene
|February 12, 2025
Summary
Paris forrestii contains double the saponins of Paris polyphylla, including key compounds like polyphyllin V. This study identifies genetic factors and enzymes, PpUGTs, responsible for variations in polyphyllin biosynthesis.
Area of Science:
- Plant biochemistry
- Molecular biology
- Pharmacognosy
Background:
- Paris polyphylla yields valuable polyphyllins for pharmaceuticals.
- Limited species are recognized medicinal sources due to high bioactive compound levels.
- Significant variation exists in saponin content within the Paris genus.
Purpose of the Study:
- Compare total saponin content between Paris forrestii and Paris polyphylla var. yunnanensis.
- Investigate the genetic basis for differential polyphyllin biosynthesis.
- Identify key enzymes and pathways regulating saponin production.
Main Methods:
- Quantification of total saponin content in two Paris species.
- Transcriptome sequencing to analyze gene expression.
- Correlation analysis between gene expression and saponin levels.
- Enzyme functional validation and molecular docking.
Main Results:
- Paris forrestii exhibited nearly double the saponin content of Paris polyphylla var. yunnanensis.
- Polyphyllin V and gracillin were primary saponins in P. forrestii, scarce in P. polyphylla.
- Differential gene expression in terpenoid and steroid biosynthesis pathways was observed.
- Two rhamnosyltransferases, PpUGT91T1 and PpUGT91T2, were identified and correlated with polyphyllin II content.
- PpUGTs were confirmed to catalyze polyphyllin V to polyphyllin III conversion.
Conclusions:
- Genetic variations significantly impact polyphyllin biosynthesis and content between Paris species.
- PpUGT enzymes play a crucial role in polyphyllin V and II production.
- Understanding these pathways provides a basis for optimizing the production of valuable medicinal compounds.
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