RFK

gene
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Also known as FLJ11149RIFK

Summary

RFK (riboflavin kinase, HGNC:30324) is a protein-coding gene on chromosome 9q21.13, encoding Riboflavin kinase (Q969G6). Catalyzes the phosphorylation of riboflavin (vitamin B2) to form flavin-mononucleotide (FMN), hence rate-limiting enzyme in the synthesis of FAD. It is a selective cancer dependency (DepMap: 34.1% of cell lines).

Riboflavin kinase (RFK; EC 2.7.1.26) is an essential enzyme that catalyzes the phosphorylation of riboflavin (vitamin B2) to form flavin mononucleotide (FMN), an obligatory step in vitamin B2 utilization and flavin cofactor synthesis (Karthikeyan et al., 2003 [PubMed 12623014]).

Source: NCBI Gene 55312 — RefSeq curated summary.

At a glance

  • GWAS associations: 2
  • Clinical variants (ClinVar): 17 total
  • Cancer dependency (DepMap): dependent in 34.1% of screened cell lines
  • MANE Select transcript: NM_018339

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:30324
Approved symbolRFK
Nameriboflavin kinase
Location9q21.13
Locus typegene with protein product
StatusApproved
AliasesFLJ11149, RIFK
Ensembl geneENSG00000135002
Ensembl biotypeprotein_coding
OMIM613010
Entrez55312

Gene structure

Transcript identifiers

Ensembl transcripts: 6 — 4 protein_coding_CDS_not_defined, 2 protein_coding

ENST00000376736, ENST00000472900, ENST00000476087, ENST00000479197, ENST00000483155, ENST00000490113

RefSeq mRNA: 1 — MANE Select: NM_018339 NM_018339

CCDS: CCDS35044

Canonical transcript exons

ENST00000376736 — 4 exons

ExonStartEnd
ENSE000014715087638552676387529
ENSE000014715197639409076394426
ENSE000035099997638855476388656
ENSE000036489587639241876392569

Expression profiles

Bgee: expression breadth ubiquitous, 292 present calls, max score 98.40.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 20.5020 / max 238.6054, expressed in 1804 samples.

FANTOM5 promoters (4 alternative TSS)

Promoter IDTPM avgSamples expressed
10103717.29701799
1010383.16531428
1010310.02686
1010320.01292

Top tissues by expression

295 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
endothelial cellCL:000011598.40gold quality
substantia nigra pars compactaUBERON:000196598.37gold quality
superior vestibular nucleusUBERON:000722797.88gold quality
substantia nigra pars reticulataUBERON:000196697.74gold quality
ponsUBERON:000098897.57gold quality
Brodmann (1909) area 23UBERON:001355497.53gold quality
CA1 field of hippocampusUBERON:000388196.88gold quality
lateral nuclear group of thalamusUBERON:000273696.84gold quality
jejunal mucosaUBERON:000039996.73gold quality
lateral globus pallidusUBERON:000247696.38gold quality
amniotic fluidUBERON:000017396.36gold quality
colonic mucosaUBERON:000031795.94gold quality
ventral tegmental areaUBERON:000269195.92gold quality
choroid plexus epitheliumUBERON:000391195.90gold quality
jejunumUBERON:000211595.78gold quality
germinal epithelium of ovaryUBERON:000130495.62gold quality
entorhinal cortexUBERON:000272895.52gold quality
superior frontal gyrusUBERON:000266195.48gold quality
mucosa of sigmoid colonUBERON:000499395.46gold quality
postcentral gyrusUBERON:000258195.42gold quality
islet of LangerhansUBERON:000000695.41gold quality
medulla oblongataUBERON:000189695.36gold quality
parietal lobeUBERON:000187295.34gold quality
esophagus squamous epitheliumUBERON:000692095.17gold quality
heart right ventricleUBERON:000208095.12gold quality
pericardiumUBERON:000240794.95gold quality
palpebral conjunctivaUBERON:000181294.80gold quality
vena cavaUBERON:000408794.74gold quality
orbitofrontal cortexUBERON:000416794.63gold quality
pylorusUBERON:000116694.58gold quality

Single-cell (SCXA)

Detected in 2 experiment(s), a significant marker in 2.

ExperimentMarker?Max mean expression
E-MTAB-6701yes81.88
E-ANND-3yes5.14

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

120 targeting RFK, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-340-5P100.0072.504437
HSA-MIR-4668-3P100.0068.742635
HSA-MIR-5692B100.0071.322622
HSA-MIR-5692C100.0071.322622
HSA-MIR-188-3P100.0068.761240
HSA-MIR-5692A100.0074.406850
HSA-MIR-1277-5P100.0073.955056
HSA-LET-7A-3P100.0074.033932
HSA-LET-7B-3P100.0074.083913
HSA-LET-7F-1-3P100.0074.023928
HSA-MIR-98-3P100.0074.083907
HSA-MIR-196A-1-3P99.9972.152772
HSA-MIR-511-3P99.9968.851467
HSA-MIR-548C-3P99.9974.017587
HSA-MIR-428299.9975.366408
HSA-MIR-366299.9973.825684
HSA-MIR-513B-5P99.9969.962150
HSA-MIR-371B-5P99.9975.344759
HSA-MIR-4789-5P99.9870.762721
HSA-MIR-806899.9873.852376
HSA-MIR-477599.9875.006394
HSA-MIR-314899.9775.066478
HSA-MIR-3065-5P99.9771.563281
HSA-MIR-570-3P99.9672.414910
HSA-MIR-4666A-3P99.9671.713434
HSA-MIR-365899.9673.874379
HSA-MIR-495-3P99.9672.814197
HSA-MIR-568899.9673.234504
HSA-MIR-548AJ-3P99.9673.385345
HSA-MIR-548X-3P99.9673.385345

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 34.1% of screened cell lines.

Literature-anchored findings (GeneRIF, showing 5)

  • the structure of riboflavin kinase cocrystallized with both MgADP and FMN is reported; drastic conformational changes associated with flavin binding are observed primarily at the so-called Flap I and Flap II loop regions (PMID:14580199)
  • results suggest that TNF, through the activation of RFK, enhances the incorporation of FAD in NADPH oxidase enzymes, a critical step for the assembly and activation of NADPH oxidase (PMID:19641494)
  • levels of riboflavin kinase expression correlate well with Gleason score, known as a good indicator of patient prognosis (PMID:21308351)
  • DR4 and DR5 have a capability to activate Nox1 by recruiting RFK, resulting in ROS-mediated apoptotic cell death in tumor cells. (PMID:22158615)
  • Results from a study on gene expression variability markers in early-stage human embryos shows that RFK is a putative expression variability marker for the 3-day, 8-cell embryo stage. (PMID:26288249)

Cross-species orthologs

7 orthologs

OrganismSymbolGene ID
danio_reriorfkENSDARG00000060522
mus_musculusRfkENSMUSG00000024712
rattus_norvegicusAABR07053065.1ENSRNOG00000004381
rattus_norvegicusRfkENSRNOG00000022273
rattus_norvegicusRfk-ps1ENSRNOG00000066048
drosophila_melanogasterRfkFBGN0014930
caenorhabditis_elegansWBGENE00011224

Protein

Protein identifiers

Riboflavin kinaseQ969G6 (reviewed: Q969G6)

Alternative names: ATP:riboflavin 5’-phosphotransferase, Flavokinase

All UniProt accessions (2): Q969G6, H7C4G0

UniProt curated annotations — full annotation on UniProt →

Function. Catalyzes the phosphorylation of riboflavin (vitamin B2) to form flavin-mononucleotide (FMN), hence rate-limiting enzyme in the synthesis of FAD. Essential for TNF-induced reactive oxygen species (ROS) production. Through its interaction with both TNFRSF1A and CYBA, physically and functionally couples TNFRSF1A to NADPH oxidase. TNF-activation of RFK may enhance the incorporation of FAD in NADPH oxidase, a critical step for the assembly and activation of NADPH oxidase.

Subunit / interactions. Monomer. Directly interacts with TNFRSF1A death domain. TNFRSF1A-binding may be supported by TRADD. In the absence of TNFRSF1A, interacts with TRADD. Independently of TNFRSF1A, interacts with the NADPH oxidase subunit CYBA.

Subcellular location. Cytoplasm.

Tissue specificity. Detected in brain, placenta and urinary bladder.

Cofactor. Zinc or magnesium.

Pathway. Cofactor biosynthesis; FMN biosynthesis; FMN from riboflavin (ATP route): step 1/1.

RefSeq proteins (1): NP_060809* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR015865Riboflavin_kinase_bac/eukDomain
IPR023465Riboflavin_kinase_dom_sfHomologous_superfamily
IPR023468Riboflavin_kinaseFamily

Pfam: PF01687

Enzyme classification (BRENDA):

  • EC 2.7.1.26 — riboflavin kinase (BRENDA: 15 organisms, 72 substrates, 59 inhibitors, 73 Km, 52 kcat entries)

Substrate kinetics (BRENDA)

3 substrates with measured Km, best-characterized 3. Km ranges are aggregated across organisms/conditions.

SubstrateKm (mM)Measurements
RIBOFLAVIN35
ATP32
ROSEOFLAVIN0.031

Catalyzed reactions (Rhea), 1 shown:

  • riboflavin + ATP = FMN + ADP + H(+) (RHEA:14357)

UniProt features (29 total): binding site 12, strand 7, helix 6, chain 1, active site 1, mutagenesis site 1, sequence conflict 1

Structure

Experimental structures (PDB)

4 structures.

PDBMethodResolution (Å)
1NB0X-RAY DIFFRACTION1.7
1NB9X-RAY DIFFRACTION1.7
1P4MX-RAY DIFFRACTION1.8
1Q9SX-RAY DIFFRACTION2.42

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q969G6-F190.730.78

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Catalytic / active sites (1): 79 (nucleophile)

Ligand- & substrate-binding residues (12): 91; 104; 107; 109; 15; 21; 27; 27; 29; 29; 82; 84

Mutagenesis-validated functional residues (1):

PositionPhenotype
79loss of riboflavin kinase activity. no effect on tnfrsf1a- and cyba-binding.

Function

Pathways and Gene Ontology

Reactome pathways

1 pathways

IDPathway
R-HSA-196843Vitamin B2 (riboflavin) metabolism

MSigDB gene sets: 196 (showing top): GSE18804_SPLEEN_MACROPHAGE_VS_COLON_TUMORAL_MACROPHAGE_DN, GRAESSMANN_APOPTOSIS_BY_DOXORUBICIN_DN, GRAESSMANN_RESPONSE_TO_MC_AND_DOXORUBICIN_DN, GOBP_REGULATION_OF_OXIDOREDUCTASE_ACTIVITY, GOBP_ORGANOPHOSPHATE_METABOLIC_PROCESS, BROWNE_HCMV_INFECTION_16HR_UP, GOBP_NUCLEOSIDE_PHOSPHATE_BIOSYNTHETIC_PROCESS, GOBP_ORGANOPHOSPHATE_BIOSYNTHETIC_PROCESS, GOBP_CARBOHYDRATE_DERIVATIVE_METABOLIC_PROCESS, GOBP_NUCLEOBASE_CONTAINING_SMALL_MOLECULE_METABOLIC_PROCESS, GOBP_SMALL_MOLECULE_BIOSYNTHETIC_PROCESS, GOBP_POSITIVE_REGULATION_OF_CATALYTIC_ACTIVITY, GOBP_POSITIVE_REGULATION_OF_MOLECULAR_FUNCTION, GOBP_CARBOHYDRATE_DERIVATIVE_BIOSYNTHETIC_PROCESS, GOBP_VITAMIN_BIOSYNTHETIC_PROCESS

GO Biological Process (7): riboflavin metabolic process (GO:0006771), apoptotic process (GO:0006915), riboflavin biosynthetic process (GO:0009231), FMN biosynthetic process (GO:0009398), positive regulation of NAD(P)H oxidase activity (GO:0033864), flavin adenine dinucleotide biosynthetic process (GO:0072388), reactive oxygen species metabolic process (GO:0072593)

GO Molecular Function (7): ATP binding (GO:0005524), riboflavin kinase activity (GO:0008531), metal ion binding (GO:0046872), nucleotide binding (GO:0000166), protein binding (GO:0005515), kinase activity (GO:0016301), transferase activity (GO:0016740)

GO Cellular Component (3): cytoplasm (GO:0005737), mitochondrion (GO:0005739), cytosol (GO:0005829)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Metabolism of water-soluble vitamins and cofactors1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
flavin-containing compound biosynthetic process3
cellular anatomical structure2
cytoplasm2
flavin-containing compound metabolic process1
programmed cell death1
apoptotic signaling pathway1
execution phase of apoptosis1
riboflavin metabolic process1
water-soluble vitamin biosynthetic process1
ribonucleoside monophosphate biosynthetic process1
ribonucleotide biosynthetic process1
FMN metabolic process1
NAD(P)H oxidase H2O2-forming activity1
positive regulation of oxidoreductase activity1
nucleotide biosynthetic process1
flavin adenine dinucleotide metabolic process1
metabolic process1
adenyl ribonucleotide binding1
purine ribonucleoside triphosphate binding1
kinase activity1
phosphotransferase activity, alcohol group as acceptor1
cation binding1
nucleoside phosphate binding1
heterocyclic compound binding1
binding1
transferase activity, transferring phosphorus-containing groups1
catalytic activity1
intracellular anatomical structure1
intracellular membrane-bounded organelle1

Protein interactions and networks

STRING

1681 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
RFKTNFRSF1AP19438969
RFKFLAD1Q8NFF5919
RFKNOX1Q9Y5S8868
RFKTRADDQ15628855
RFKCYBAP13498849
RFKFDXRP22570747
RFKNOXO1Q8NFA2702
RFKPIP4K2BP78356647
RFKTHBS1P07996578
RFKSLC25A32Q9H2D1575
RFKSLC52A1Q9NWF4557
RFKCYBBP04839540
RFKNOXA1Q86UR1517
RFKRIPK1Q13546515
RFKMT-CYBP00156513

IntAct

16 interactions, top by confidence:

ABTypeScore
TNFRSF1ATRADDpsi-mi:“MI:0914”(association)0.960
TNFRSF1ARFKpsi-mi:“MI:0915”(physical association)0.560
RFKCNTLNpsi-mi:“MI:0915”(physical association)0.560
RFKCYBApsi-mi:“MI:0914”(association)0.460
TNFRSF1ARFKpsi-mi:“MI:0407”(direct interaction)0.410
RFKIL1RNpsi-mi:“MI:0915”(physical association)0.400
TNFRSF1ACYBBpsi-mi:“MI:0914”(association)0.350
CYBATNFRSF1Apsi-mi:“MI:0914”(association)0.350
MRPL49UBA6psi-mi:“MI:0914”(association)0.350
RFKCNTLNpsi-mi:“MI:0915”(physical association)0.000
RFKpsi-mi:“MI:0915”(physical association)0.000
RAB1ARFKpsi-mi:“MI:0915”(physical association)0.000
DNAJB9RFKpsi-mi:“MI:0915”(physical association)0.000

BioGRID (32): GRHPR (Co-fractionation), MEMO1 (Co-fractionation), RFK (Co-fractionation), RFK (Co-fractionation), RFK (Co-fractionation), RFK (Co-fractionation), RFK (Two-hybrid), RFK (Affinity Capture-Western), TNFRSF1A (Affinity Capture-Western), TRADD (Affinity Capture-Western), CYBA (Affinity Capture-Western), RFK (Two-hybrid), RFK (Two-hybrid), RFK (Two-hybrid), RFK (Two-hybrid)

ESM2 similar proteins: A2AKQ0, A2VE55, A5GFZ5, C9WPN6, F1QGW6, F6RQL9, O60762, O70152, O77676, P00516, P0C605, P20461, P32189, P35250, P37273, P41091, P53033, P81795, Q05B83, Q0IID9, Q13126, Q13976, Q14409, Q15B89, Q1JQ93, Q2KHU8, Q2KJ61, Q2TBV5, Q2VIR3, Q3MHF7, Q5HZM6, Q5MB13, Q5R797, Q5RDC9, Q5RIC0, Q5ZHS1, Q5ZMS3, Q63060, Q641W4, Q64516

Diamond homologs: A1C603, A1DG00, A2QFH1, A3M0C9, A4QQ05, A5DAH9, A5E1A0, O74866, O76206, P0C5D9, Q03778, Q0CHR1, Q2UMM4, Q4WHD2, Q59263, Q5AW61, Q6CG11, Q6CT57, Q6FM49, Q6M923, Q75DY2, Q84MD8, Q8CFV9, Q969G6, P94465, P73651, P22990, Q8Y7F2, P0AG40, P0AG41, P0AG42, P0AG43, P44957, P47391, P54575, P57250, P75587, Q8K9Z1, Q8Y914, A4IT50

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

17 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance15
Likely benign0
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

444 predictions. Top by Δscore:

VariantEffectΔscore
9:76387525:TGACT:Tacceptor_gain1.0000
9:76387526:GACT:Gacceptor_gain1.0000
9:76387528:CT:Cacceptor_gain1.0000
9:76387529:TC:Tacceptor_loss1.0000
9:76387530:C:CCacceptor_gain1.0000
9:76387531:T:Cacceptor_loss1.0000
9:76387547:CAGG:Cacceptor_gain1.0000
9:76388549:CTTA:Cdonor_loss1.0000
9:76388551:TA:Tdonor_loss1.0000
9:76388552:A:ACdonor_gain1.0000
9:76388552:ACCT:Adonor_loss1.0000
9:76388553:C:CCdonor_gain1.0000
9:76388553:CCTA:Cdonor_gain1.0000
9:76388553:CCTAA:Cdonor_gain1.0000
9:76388652:GTTTC:Gacceptor_gain1.0000
9:76388653:TTTC:Tacceptor_gain1.0000
9:76388654:TTC:Tacceptor_gain1.0000
9:76388654:TTCC:Tacceptor_loss1.0000
9:76388655:TC:Tacceptor_gain1.0000
9:76388656:CC:Cacceptor_gain1.0000
9:76388657:C:CCacceptor_gain1.0000
9:76388658:T:Gacceptor_loss1.0000
9:76388659:A:ACacceptor_gain1.0000
9:76388659:A:Cacceptor_gain1.0000
9:76388664:C:CTacceptor_gain1.0000
9:76388665:A:Tacceptor_gain1.0000
9:76392412:GCTTA:Gdonor_loss1.0000
9:76392414:TTAC:Tdonor_loss1.0000
9:76392415:TA:Tdonor_loss1.0000
9:76392416:ACCAT:Adonor_loss1.0000

AlphaMissense

1030 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
9:76392455:C:TG66E0.999
9:76392460:G:CS64R0.999
9:76392460:G:TS64R0.999
9:76392462:T:GS64R0.999
9:76388580:C:GR104T0.998
9:76387491:C:GA126P0.997
9:76387502:T:GD122A0.997
9:76387523:A:GL115P0.997
9:76392506:C:TG49D0.997
9:76394129:C:GG15R0.997
9:76387502:T:AD122V0.996
9:76387503:C:GD122H0.996
9:76388564:A:CF109L0.996
9:76388564:A:TF109L0.996
9:76388566:A:GF109L0.996
9:76388579:T:AR104S0.996
9:76388579:T:GR104S0.996
9:76388654:T:AE79D0.996
9:76388654:T:GE79D0.996
9:76392501:C:GA51P0.996
9:76392565:A:CN29K0.996
9:76392565:A:TN29K0.996
9:76394117:C:AG19C0.996
9:76394117:C:GG19R0.996
9:76394120:G:TR18S0.996
9:76394128:C:TG15D0.996
9:76387515:C:GA118P0.995
9:76388650:G:CH81D0.995
9:76388655:T:AE79V0.995
9:76388656:C:TE79K0.995

dbSNP variants (sampled 300 via entrez): RS1000001092 (9:76396338 C>T), RS1000560741 (9:76389207 C>A,T), RS1001016414 (9:76385528 T>C), RS1001489730 (9:76394375 G>A,C), RS1001501089 (9:76394476 G>A), RS1001679438 (9:76395095 T>G), RS1001815320 (9:76395329 C>A,G,T), RS1001836486 (9:76388721 C>T), RS1001984216 (9:76389905 G>C), RS1002292456 (9:76389697 G>A), RS1002557766 (9:76394428 C>A), RS1002661496 (9:76387515 C>A,G,T), RS1002955626 (9:76387193 T>A,C), RS1003648511 (9:76387539 G>C), RS1003828688 (9:76393515 T>A,C)

Disease associations

OMIM: gene MIM:613010 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

2 associations (top):

StudyTraitp-value
GCST000267_7Multiple sclerosis (age of onset)5.000000e-06
GCST009391_1430Metabolite levels2.000000e-06

EFO canonical traits (2, from GWAS)

EFO IDTrait name
EFO:0004847age at onset
EFO:0010408triacylglycerol 50:1 measurement

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

PharmGKB clinical annotations

1 annotations.

VariantTypeLevelDrugsPhenotypes
rs11144870Efficacy3citalopram;escitalopramDepressive Disorder

PharmGKB variants

1 variants.

VariantGenesLevelScore#Clin annotsDrugs
rs11144870RFK30.001citalopram;escitalopram

CTD chemical–gene interactions

46 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Valproic Acidincreases methylation, affects expression, increases expression5
trichostatin Aaffects cotreatment, decreases expression2
sodium arsenitedecreases expression, increases expression2
Acetaminophendecreases expression, increases expression2
Hydrogen Peroxideaffects cotreatment, decreases expression, decreases response to substance2
Phenylmercuric Acetateaffects cotreatment, increases expression2
Tamoxifenaffects expression, affects cotreatment, increases expression2
7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxideincreases expression2
Raloxifene Hydrochlorideaffects expression, affects cotreatment, increases expression2
methylmercuric chlorideincreases expression1
triphenyl phosphateaffects expression1
bisphenol Aaffects cotreatment, increases expression1
zinc chromateincreases abundance, increases expression1
di-n-butylphosphoric acidaffects expression1
chromium hexavalent ionincreases abundance, increases expression1
4-(5-benzo(1,3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamideaffects cotreatment, increases expression, decreases expression1
dorsomorphinaffects cotreatment, increases expression, decreases expression1
bisphenol Saffects cotreatment, increases expression1
3-(2-hydroxy-4-(2-methylnonan-2-yl)phenyl)cyclohexan-1-oldecreases expression1
Air Pollutantsdecreases expression, increases abundance1
Carbamazepineaffects expression1
Cisplatindecreases response to substance1
Demecolcineincreases expression1
Dexamethasoneaffects cotreatment, increases expression1
Diamidedecreases response to substance1
Diazinonincreases methylation1
Doxorubicindecreases expression1
Ethyl Methanesulfonateincreases expression1
Flavin-Adenine Dinucleotideincreases abundance1
Flavin Mononucleotideincreases abundance1

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.