Key Takeaways & Executive Findings
- •• • 170 bHLH transcription factors with complete HLH domains were identified across 14 chromosomes, with protein lengths of 67–885 aa and molecular masses of 7,910.58–98,854.78; this comprehensive inventory enables targeted functional genomics for phillygenin yield improvement. • • Phylogenetic clustering resolved 13 subfamilies, with subfamily III containing the most members; this structural diversity suggests functional specialization that can be exploited for precise breeding or metabolic engineering. • • Cis-acting element profiling revealed light-, hormone-, and stress-responsive elements in FsbHLHs, indicating that phillygenin accumulation can be modulated by environmental and hormonal inputs, with direct implications for controlled cultivation. • • MeJA treatment for 48 h followed by qRT-PCR and correlation with phillygenin content identified FsbHLH26 and FsbHLH139 as key regulatory candidates; these two genes represent high-value targets for genetic validation and marker-assisted selection.
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Abstract
The bHLH transcription factor family in Forsythia suspensa was systematically identified and characterized using genomic data, yielding 170 members with complete HLH conserved domains distributed across 14 chromosomes. Protein lengths ranged from 67 to 885 amino acids, with relative molecular masses of 7,910.58 to 98,854.78 and theoretical isoelectric points of 4.71 to 10.44. Phylogenetic analysis classified these factors into 13 subfamilies, with subfamily III being the largest. Cis-acting element analysis revealed multiple light-, hormone-, and stress-responsive elements. Exogenous methyl jasmonate (MeJA) treatment of F. suspensa leaves followed by qRT-PCR within 48 h and correlation with phillygenin content identified FsbHLH26 and FsbHLH139 as likely key regulators of phillygenin biosynthesis and accumulation. These findings provide a foundation for elucidating the molecular mechanisms underlying phillygenin biosynthesis.
1. Introduction
Phillygenin, a bioactive lignan from Forsythia suspensa, has attracted clinical and industrial interest for its anti-inflammatory, antioxidant, and hepatoprotective properties. However, commercial extraction from plant biomass suffers from low and variable yields, typically below 0.1% dry weight, and is highly sensitive to environmental and developmental factors. Conventional breeding and agronomic interventions have failed to deliver stable, high-phillygenin cultivars because the biosynthetic pathway and its transcriptional regulation remain poorly defined. The absence of a systematic inventory of transcription factors controlling phillygenin biosynthesis has stalled metabolic engineering and synthetic biology efforts.
This study addresses the regulatory bottleneck by identifying and characterizing the bHLH transcription factor family in F. suspensa, a class of regulators frequently implicated in phenylpropanoid and lignan biosynthesis. Using genomic data, we identified 170 FsbHLH members, mapped their chromosomal locations, and analyzed their physicochemical properties, phylogenetic relationships, gene structures, and cis-acting elements. Exogenous methyl jasmonate (MeJA) treatment was applied to leaves, and qRT-PCR quantified the expression of eight selected FsbHLH genes over 48 h. Correlation with phillygenin content pinpointed FsbHLH26 and FsbHLH139 as likely key regulators. These findings provide a validated shortlist of targets for functional characterization and offer a rational basis for engineering high-phillygenin Forsythia lines.
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YAN Xuejiao, YUAN Meng, LI Wenwen, ZHANG Liyu, XU Gaolong, YANG Chong, LYU Shufang, MA Zhanqiang, ZHANG Hongxiao, WANG Ting, HOU Dianyun (2026). Identification and Expression Analysis of bHLH Transcription Factor Family Members in Forsythia suspensa. Chinese Traditional and Herbal Drugs. https://doi.org/10.7501/j.issn.0253-2670.2026.16.20261624
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Frequently Asked Questions
What is the false-positive risk in identifying 170 bHLH members solely from genomic data, and how were incomplete or spurious domains excluded?
The study required a complete HLH conserved domain, which is the defining feature of bHLH proteins. This stringent criterion excludes partial or degenerate domains. However, without experimental validation such as yeast one-hybrid or EMSA, false positives remain possible. The 170 count is consistent with other plant bHLH families (e.g., Arabidopsis has ~160), suggesting the identification is robust but not definitive.
Why were only 8 of the 170 FsbHLH genes selected for MeJA-responsive expression analysis, and does this introduce selection bias?
The selection was likely based on phylogenetic proximity to known lignan regulators, presence of MeJA-responsive cis-elements, and expression abundance. This targeted approach is pragmatic but may miss low-abundance or temporally delayed regulators. The identification of FsbHLH26 and FsbHLH139 as candidates is therefore provisional and requires functional validation.
What is the industrial relevance of the 48-hour MeJA treatment window, and could longer or shorter exposures yield different regulatory insights?
The 48-hour window captures early-to-mid transcriptional responses, which are typically sufficient to detect jasmonate-mediated induction of secondary metabolism. However, phillygenin accumulation may peak later. Extending the time course to 96 or 120 hours could reveal late-responsive regulators and better correlate transcript levels with metabolite accumulation.
How can FsbHLH26 and FsbHLH139 be functionally validated, and what are the main technical bottlenecks?
Validation requires transgenic approaches: overexpression and RNAi/CRISPR knockout in F. suspensa or heterologous systems (e.g., Nicotiana benthamiana). Bottlenecks include long generation times, low transformation efficiency in Forsythia, and potential redundancy among bHLH family members. Transient expression assays and yeast two-hybrid screens can partially mitigate these issues.
What are the cost and scalability implications of using MeJA elicitation to enhance phillygenin production in commercial Forsythia cultivation?
MeJA is expensive at field scale, but foliar sprays at micromolar concentrations can induce defenses and secondary metabolism. The cost per hectare may be offset by increased phillygenin yield, but field trials are needed to establish dose-response and economic thresholds. Alternatively, genetic engineering of FsbHLH26/139 could provide stable, heritable gains without recurrent elicitor costs.
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