Medicinal Plant Research 2025, Vol.15, No.5, 197-205 http://hortherbpublisher.com/index.php/mpr 202 6.2 Optimization of metabolic pathways and strategies for high-yield synthesis Optimization techniques are modular pathway design, metabolic flux balance, and dynamic control systems. SynBio tools support the reconstruction of multi-gene pathways across various species, and computational modeling and machine learning guide pathway design and predict bottlenecks. Techniques such as chromosomal integration, enzyme engineering, and compartmentalization further optimize yield and stability (Lee et al., 2018; Choi et al., 2019; García-Granados et al., 2019). 6.3 Application of CRISPR/Cas gene editing in pathway regulation CRISPR/Cas systems have revolutionized metabolic engineering with the potential to introduce precise, multiplexed genome modifications. CRISPR/Cas9 is used in bacteria and yeast for specific gene knockouts, pathway streamlining, and insertion of large biosynthetic gene clusters (Patra et al., 2021; Lv et al., 2022). This not only accelerates strain development but also allows gene expression fine-tuning for improved metabolite yields. 6.4 Industrial synthesis: prospects and challenges Industrial production of ginsenosides is constrained by metabolic load, pathway bottlenecks, and demand for robust, high-yielding strains. These limitations are being overcome by recent advances in systems metabolic engineering, genome-scale modeling, and high cell-density fermentation. Better genetic stability, scalability of process, and cost-effectiveness are yet required for industrial applications on a large scale (Navale et al., 2021; Han et al., 2023). 7 Current Research Status and Limitations 7.1 Unresolved aspects in pathway elucidation While significant progress has been achieved in the identification of key enzymes and intermediates of ginsenoside and polysaccharide biosynthesis, several important points remain unresolved. For ginsenosides, for example, the complete set of cytochrome P450s responsible for specific hydroxylation and oxidation reactions is yet to be completely delineated, and tissue- and development stage-specific accumulation patterns are not clearly understood. Similarly, for ginseng polysaccharides, the precise mechanisms of polymerization, modes of branching, and their regulation by upstream sugar nucleotide pools must be clarified. Limited data on subcellular localization and metabolite transport also hinders a thorough understanding of biosynthetic fluxes (Velte and Stawinoga, 2016). 7.2 Insufficient systematic identification of functional genes and enzymes Although transcriptomic and proteomic studies provided numerous candidate genes, there is no comprehensive functionally validated set of enzymes and regulator proteins. Many predicted genes are uncharacterized due to heterologous expression difficulties, redundancy among enzyme family members, or very low in planta expression. Moreover, only on the rarest of occasions have been transcription factors and post-translational modifiers that regulate pathway activity identified, precluding systematic reconstruction of the regulatory network (Yousef, 2023). 7.3 Bottlenecks in translating basic research into applied outcomes Translational applications, for instance, metabolic engineering, synthetic biology, large-scale production of high-value ginsenosides or polysaccharides, are presently still limited by incomplete pathway information. Low efficiency of heterologous expression systems, low pathway flux, uncontrolled stereochemistry, and the inability to reproduce tissue-specific or developmental regulation ex vivo are present bottlenecks. In addition, integration of multi-omics information into predictive models to optimize cultivation or bioengineer is in its infancy. Filling these gaps is required in order to move towards precision-guided manufacturing and industrial utilization (Shin, 2023). 8 Concluding Remarks There have been significant developments in recent years toward elucidating the Panax ginseng biosynthetic pathways of ginsenosides and polysaccharides. These include the identification and functional characterization of
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