Comparative Transcriptome Analysis Identifies Genes Involved in Diosgenin Biosynthesis in Trigonella foenum-graecum L

Area of Science:

• Plant biochemistry
• Metabolic engineering
• Synthetic biology

Background:

• Fenugreek (Trigonella foenum-graecum) is a key source of diosgenin, a precursor for numerous steroidal drugs.
• Methyl jasmonate (MeJA) is known to enhance diosgenin biosynthesis in fenugreek.
• Genes controlling late-stage diosgenin synthesis from cholesterol remain largely uncharacterized.

Purpose of the Study:

• To identify novel cytochrome P450 (CYP) and glycosyltransferase (GT) genes involved in late-stage diosgenin biosynthesis in fenugreek.
• To analyze the regulatory roles of MeJA-induced transcription factors (TFs) in this pathway.
• To provide genetic resources for enhancing diosgenin production via synthetic biology.

Main Methods:

• Comparative transcriptome analysis of MeJA-treated and control fenugreek seedlings.
• Differential gene expression analysis to identify induced CYP and GT candidates.
• Phylogenetic analysis and gene expression profiling across different time points.

Main Results:

• Identified several MeJA-induced CYP and GT genes potentially involved in diosgenin biosynthesis.
• Phylogenetic and expression analyses suggest specific CYP and GT families participating in late-stage synthesis.
• Identified MeJA-induced TFs that may regulate diosgenin biosynthesis.

Conclusions:

• This study elucidates potential key genes in fenugreek's diosgenin pathway.
• Provides valuable genetic insights for improving diosgenin production through metabolic engineering and synthetic biology approaches.