The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.
We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.
We are interested in where in or outside the cell the gene product carries out its function.
We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.
Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.
FLOWERING LOCUS C (FLC) in Arabidopsis thaliana encodes a MADS-box transcription factor that acts as a master repressor of flowering by directly suppressing expression of floral integrator genes such as FT and SOC1 (and also repressing FD) (li2025epigeneticregulationof pages 2-4, zhou2026beyondfloweringthe pages 2-3). The core vernalization response in Arabidopsis is mediated by cold-induced epigenetic silencing of the FLC locus, involving Polycomb (PRC2) H3K27me3 deposition and long noncoding RNA (lncRNA) pathways; recent work supports a model in which COOLAIR antisense transcription and PRC2 act in parallel to silence FLC (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 5-6). Newer studies also implicate nuclear architecture (nuclear pore Y-complex/periphery tethering) as a mechanistic layer influencing FLC transcriptional state (huang2024thenuclearpore pages 4-6, huang2024thenuclearpore pages 37-38). Translationally, the FLC-centered vernalization module is widely leveraged as a conceptual and practical framework for flowering-time manipulation in Brassicaceae crops, and can be perturbed by chemical devernalizers in Arabidopsis or through engineering of FLC ortholog regulation (otsuka2025smallmoleculesand pages 4-5, kim2026currentunderstandingof pages 7-8).
The target is Arabidopsis thaliana FLOWERING LOCUS C (FLC)—a MADS-box transcription factor central to vernalization-regulated flowering time (zhou2026beyondfloweringthe pages 1-2, li2025epigeneticregulationof pages 2-4). This matches the UniProt-provided identity (Q9S7Q7; At5g10140), and the literature used here explicitly concerns Arabidopsis FLC rather than unrelated “FLC” symbols in other organisms (nielsen2024coolairandprc2 pages 1-2, li2025epigeneticregulationof pages 2-4).
FLC is a MADS-box transcription factor that directly represses transcription of core floral activators/integrators:
- Direct repression of FT and SOC1 (zhou2026beyondfloweringthe pages 1-2, li2025epigeneticregulationof pages 2-4).
- Direct repression of FD by binding to the first intron of FD (li2025epigeneticregulationof pages 2-4).
A recent review specifies FLC binding to CArG-box [CC(A/T)6GG] motifs in promoters of FT and SOC1 as a mechanistic basis of repression (zhou2026beyondfloweringthe pages 2-3). This is consistent with genome-wide ChIP-seq that found 505 FLC binding sites and 786 putative target genes, with promoter enrichment and frequent CArG-like motifs (deng2011floweringlocusc pages 2-2).
FLC operates within MADS-domain repressor complexes and in coordination with other flowering repressors:
- A Nature Communications study reports FLC and other FLC-clade members can directly interact and form nuclear complexes, and that FLC-dependent floral repression requires other clade members (gu2013arabidopsisflcclade pages 1-2).
- Reviews also emphasize FLC’s functional association with other MADS proteins such as SVP (zhou2026beyondfloweringthe pages 2-3).
Direct subcellular localization of the FLC protein is not quantified in the excerpts here, but FLC’s role as a DNA-binding transcription factor and its operation in nuclear MADS-domain complexes implies a nuclear site of action (gu2013arabidopsisflcclade pages 1-2, deng2011floweringlocusc pages 2-2).
A major recent development is evidence that the FLC locus (chromatin) is regulated by nuclear architecture:
- The nuclear pore Y-complex (Nup107–160 complex) is reported to regulate FLC transcription by associating with FLC chromatin and interacting with histone H2A at the nuclear membrane; Nup96 enhances FLC positioning at the nuclear periphery, and disruption of this system reduces perinuclear positioning and represses FLC expression (huang2024thenuclearpore pages 4-6, huang2024thenuclearpore pages 37-38).
FLC acts as a central node in flowering-time control: when FLC is highly expressed it prevents flowering by repressing FT/SOC1; vernalization and other pathways reduce FLC to permit floral transition (li2025epigeneticregulationof pages 5-7, zhou2026beyondfloweringthe pages 1-2).
A 2024 PNAS study provides a mechanistic framework in which COOLAIR and PRC2 silence FLC in parallel:
- COOLAIR antisense transcription pathway: fast-responding; cold induces COOLAIR early, and COOLAIR transcription is mutually exclusive with FLC sense transcription at each allele; COOLAIR is associated with reduction of H3K36me3 and disruption of an FLC gene loop (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 3-5).
- PRC2 epigenetic pathway: slower; PRC2 nucleates H3K27me3 at an internal nucleation region and H3K27me3 then spreads across the locus for stable silencing; VIN3 is slowly induced by cold and supports the gradual allele-by-allele switch to stable OFF states (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 2-3).
- Temperature dynamics: COOLAIR repression is particularly sensitive to fluctuating freezing regimes; in fluctuating cold, COOLAIR drives stronger repression than PRC2 alone, while H3K27me3 accumulation shows less regime dependence (nielsen2024coolairandprc2 pages 5-6).
A cropped schematic from this work (Figure 4E) summarizes the two-pathway model and their chromatin features (nielsen2024coolairandprc2 media 4fe3dd57).
Reviews emphasize that vernalization-induced repression at FLC involves Polycomb-mediated H3K27me3 and coordinated chromatin changes that are mitotically maintained after return to warm conditions (shi2023roleofmethylation pages 1-2, kim2026currentunderstandingof pages 3-5). A broader epigenetic review compiles evidence that histone deacetylation and histone ubiquitination/deubiquitination systems modulate FLC expression and flowering time (li2025epigeneticregulationof pages 7-9, li2025epigeneticregulationof pages 5-7).
A key advance is the explicit demonstration/modeling that COOLAIR and PRC2 are parallel inputs rather than a single linear pathway, which helps reconcile prior discrepancies across experimental regimes (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 5-6).
Huang et al. (Oct 2024, The Plant Cell) report that nuclear pore Y-complex nucleoporins associate with FLC chromatin at the nuclear membrane, and that Nup96 promotes FLC locus positioning at the nuclear periphery, influencing RNA polymerase II occupancy and histone modification state at FLC (huang2024thenuclearpore pages 4-6, huang2024thenuclearpore pages 37-38). This expands “FLC regulation” beyond local chromatin modifiers to include subnuclear compartmentalization.
A 2023 review in Horticulture Research consolidates evidence that vernalization silences FLC through PRC2-mediated H3K27me3 and highlights broader methylation layers (histone/DNA/RNA methylation) that intersect with flowering networks (shi2023roleofmethylation pages 1-2).
Deng et al. (PNAS, Apr 2011) provide high-citation genome-scale evidence:
- 505 FLC binding sites and 786 putative FLC target genes (deng2011floweringlocusc pages 2-2).
- Peak distribution: 52.5% promoter regions; motif occurrence: 69% of sites contain a CArG-box motif (deng2011floweringlocusc pages 2-2).
Otsuka et al. (Communications Biology, Jan 2025) screened chemical libraries and identified devernalizer (DVR) compounds that reactivate FLC:
- Screening scale: 16,800 compounds plus an additional 13,790 in a blind screen; 5 compounds (DVR01–05) identified (otsuka2025smallmoleculesand pages 2-4).
- DVR02/03/05 induced approximately two-fold higher FLC expression compared with vernalized controls (p < 0.05) (otsuka2025smallmoleculesand pages 1-2).
- DVR06 delayed bolting from 40 to 45 days and increased leaf number by 4 in vernalized plants (p < 0.05) (otsuka2025smallmoleculesand pages 4-5).
- Chromatin: H3K27me3 peaks decreased from 3,281 (vernalized) to 2,812 (DVR06-treated vernalized), and RNA-seq identified 816 upregulated / 769 downregulated genes in DVR06-treated plants (otsuka2025smallmoleculesand pages 5-6).
The DVR chemical devernalizers demonstrate that small molecules can be used to reactivate FLC by reducing repressive chromatin marks (H3K27me3), thereby delaying flowering in vernalized plants (otsuka2025smallmoleculesand pages 4-5). While shown in Arabidopsis as a research and potential agronomic concept, this provides a tangible “implementation” route for modulating vernalization memory and flowering timing via exogenous treatments (otsuka2025smallmoleculesand pages 5-6).
Multiple reviews and crop-focused work emphasize that FLC orthologs in Brassica crops are breeding-relevant targets:
- Brassica species harbor multiple FLC homologs that map to flowering QTLs, and transgenic tests demonstrate functional conservation (e.g., BrFLC overexpression delays flowering; BoFLC complementation rescues Arabidopsis flc phenotype) (kim2026currentunderstandingof pages 7-8).
- Cis-regulatory and intronic structural variants (e.g., intron insertions/deletions) can impair cold-induced repression and alter vernalization requirement, enabling marker-assisted selection and potential genome-editing strategies (yano2026vernalizationcontrolin pages 9-10, kim2026currentunderstandingof pages 7-8).
A 2024 Nature Communications study in Brassica rapa demonstrates genetic engineering of a chromatin regulator (BrJMJ18, an H3K36me2/3 demethylase) with strong flowering-time outcomes in temperature-dependent contexts, and the mechanism includes modulation of BrFLC3 (xin2024temperaturedependentjumonjidemethylase pages 1-2, xin2024temperaturedependentjumonjidemethylase pages 6-8). Quantitatively, CRISPR knockout lines did not bolt within 120 days under high temperature (xin2024temperaturedependentjumonjidemethylase pages 3-5).
The literature supports a two-stage conceptualization: rapid, temperature-sensitive transcriptional repression via antisense transcription and chromatin microstructure (COOLAIR, gene-loop disruption), coupled to a slower Polycomb state switch (H3K27me3 nucleation/spreading) that provides stability and memory (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 6-8). This architecture plausibly explains why different experimental temperature regimes yield different apparent dependencies on COOLAIR versus PRC2—because they contribute differently across time and temperature dynamics (nielsen2024coolairandprc2 pages 5-6).
The nuclear pore Y-complex study implies that transcriptional regulation of FLC cannot be understood solely from local promoter/enhancer and chromatin marks; rather, locus positioning at the nuclear periphery can modulate polymerase occupancy and histone-modification balance at FLC (huang2024thenuclearpore pages 4-6, huang2024thenuclearpore pages 37-38). This introduces a mechanistic bridge between nuclear architecture and vernalization-regulated developmental timing.
| Topic | Key findings | Best recent source(s) with year and DOI URL |
|---|---|---|
| Molecular function | • Arabidopsis FLC/At5g10140 is a MADS-box transcription factor and master floral repressor • Directly represses FT and SOC1; also represses FD via its first intron • Function is consistent with UniProt Q9S7Q7 annotation as a MADS-box protein (li2025epigeneticregulationof pages 2-4, zhou2026beyondfloweringthe pages 1-2) | Li et al., 2025, Plants, https://doi.org/10.3390/plants14223471 (li2025epigeneticregulationof pages 2-4); Zhou et al., 2026, Seed Biology, https://doi.org/10.48130/seedbio-0026-0007 (zhou2026beyondfloweringthe pages 1-2) |
| DNA motif / targets | • FLC binds CArG-box motifs [CC(A/T)6GG] in promoters of FT and SOC1 • This DNA binding underlies delayed flowering • Reviews also support direct repression of FD (zhou2026beyondfloweringthe pages 2-3, li2025epigeneticregulationof pages 2-4) | Zhou et al., 2026, Seed Biology, https://doi.org/10.48130/seedbio-0026-0007 (zhou2026beyondfloweringthe pages 2-3); Li et al., 2025, Plants, https://doi.org/10.3390/plants14223471 (li2025epigeneticregulationof pages 2-4) |
| Pathway role | • FLC is the central floral repressor in the vernalization pathway • High FLC blocks floral transition by suppressing FT/SOC1; vernalization relieves this repression • FRI acts upstream to maintain/activate high FLC expression before cold (li2025epigeneticregulationof pages 2-4, zhou2026beyondfloweringthe pages 1-2, shi2023roleofmethylation pages 1-2) | Li et al., 2025, Plants, https://doi.org/10.3390/plants14223471 (li2025epigeneticregulationof pages 2-4); Shi et al., 2023, Horticulture Research, https://doi.org/10.1093/hr/uhad174 (shi2023roleofmethylation pages 1-2) |
| Epigenetic regulation during vernalization | • Cold triggers a switch from active H3K36me3 to repressive H3K27me3 at FLC • PRC2 nucleates H3K27me3 at an internal nucleation region, then H3K27me3 spreads across the locus for stable silencing • Histone deacetylation and Polycomb recruitment reinforce post-vernalization repression (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 2-3, nielsen2024coolairandprc2 pages 3-5, li2025epigeneticregulationof pages 7-9) | Nielsen et al., 2024, PNAS, https://doi.org/10.1073/pnas.2311474121 (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 2-3, nielsen2024coolairandprc2 pages 3-5); Li et al., 2025, Plants, https://doi.org/10.3390/plants14223471 (li2025epigeneticregulationof pages 7-9) |
| lncRNAs | • COOLAIR is cold-induced antisense transcription at FLC and can rapidly repress sense FLC transcription • COOLAIR and PRC2 act in parallel, not strictly sequentially, during silencing • Reviews also implicate COLDAIR in facilitating PRC2/H3K27me3-based repression (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 2-3, li2025epigeneticregulationof pages 5-7) | Nielsen et al., 2024, PNAS, https://doi.org/10.1073/pnas.2311474121 (nielsen2024coolairandprc2 pages 1-2, nielsen2024coolairandprc2 pages 2-3); Li et al., 2025, Plants, https://doi.org/10.3390/plants14223471 (li2025epigeneticregulationof pages 5-7) |
| Complexes / partners | • Upstream activation involves the FRI complex with FRL1, FES1, SUF4, FLX • Silencing involves PRC2, VIN3/VRN5, and associated chromatin regulators • FLC functionally cooperates with other MADS-box repressors such as SVP (li2025epigeneticregulationof pages 2-4, nielsen2024coolairandprc2 pages 1-2, zhou2026beyondfloweringthe pages 2-3) | Li et al., 2025, Plants, https://doi.org/10.3390/plants14223471 (li2025epigeneticregulationof pages 2-4); Nielsen et al., 2024, PNAS, https://doi.org/10.1073/pnas.2311474121 (nielsen2024coolairandprc2 pages 1-2); Zhou et al., 2026, Seed Biology, https://doi.org/10.48130/seedbio-0026-0007 (zhou2026beyondfloweringthe pages 2-3) |
| Quantitative data points | • In fluctuating autumn-like cold, one freezing night induced COOLAIR, but several freezing nights were required to silence FLC (nielsen2024coolairandprc2 pages 1-2) • Chemical devernalizer DVR06 delayed bolting from 40 to 45 days and increased leaf number by 4 in vernalized Arabidopsis; genome-wide H3K27me3 peaks fell from 3,281 in vernalized plants to 2,812 with DVR06 treatment (otsuka2025smallmoleculesand pages 4-5) • Screening identified 5 devernalizer compounds from 16,800 molecules; several induced ~2-fold higher FLC expression (otsuka2025smallmoleculesand pages 2-4, otsuka2025smallmoleculesand pages 1-2) | Nielsen et al., 2024, PNAS, https://doi.org/10.1073/pnas.2311474121 (nielsen2024coolairandprc2 pages 1-2); Otsuka et al., 2025, Communications Biology, https://doi.org/10.1038/s42003-025-07553-7 (otsuka2025smallmoleculesand pages 2-4, otsuka2025smallmoleculesand pages 1-2, otsuka2025smallmoleculesand pages 4-5) |
| Applications / translation to crops | • Arabidopsis FLC mechanism is a reference framework for Brassica flowering-time control and crop adaptation • In Brassica rapa, the H3K36 demethylase BrJMJ18 modulates BrFLC3 and flowering in a temperature-dependent manner; CRISPR and overexpression data support translational relevance • Recent reviews highlight epigenetic engineering of flowering pathways as a crop-breeding opportunity (xin2024temperaturedependentjumonjidemethylase pages 6-8, xin2024temperaturedependentjumonjidemethylase pages 1-2, yano2026vernalizationcontrolin pages 5-6) | Xin et al., 2024, Nature Communications, https://doi.org/10.1038/s41467-024-49721-z (xin2024temperaturedependentjumonjidemethylase pages 6-8, xin2024temperaturedependentjumonjidemethylase pages 1-2); Yano et al., 2026, Frontiers in Horticulture, https://doi.org/10.3389/fhort.2026.1791790 (yano2026vernalizationcontrolin pages 5-6) |
Table: This table compiles the core functional annotation of Arabidopsis thaliana FLC (UniProt Q9S7Q7), emphasizing molecular function, vernalization-linked chromatin regulation, and recent quantitative findings. It is designed as a compact evidence map for downstream gene annotation or literature review.
References
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