ARK2N

gene
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Also known as MGC12909ARKL1RNF111L1

Summary

ARK2N (arkadia (RNF111) N-terminal like PKA signaling regulator 2N, HGNC:28172) is a protein-coding gene on chromosome 18q21.1, encoding Protein ARK2N (Q96B23). AMPK substrate important for exercise capacity and skeletal muscle function.

Enables transcription corepressor activity. Involved in negative regulation of viral life cycle. Is active in chromatin.

Source: NCBI Gene 147339 — RefSeq curated summary.

At a glance

  • GWAS associations: 46
  • Clinical variants (ClinVar): 12 total — 1 pathogenic
  • MANE Select transcript: NM_145055

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:28172
Approved symbolARK2N
Namearkadia (RNF111) N-terminal like PKA signaling regulator 2N
Location18q21.1
Locus typegene with protein product
StatusApproved
AliasesMGC12909, ARKL1, RNF111L1, Ark2N
Ensembl geneENSG00000152242
Ensembl biotypeprotein_coding
OMIM621303
Entrez147339

Gene structure

Transcript identifiers

Ensembl transcripts: 11 — 10 protein_coding, 1 retained_intron

ENST00000587591, ENST00000588730, ENST00000615052, ENST00000615553, ENST00000619230, ENST00000619301, ENST00000905557, ENST00000905558, ENST00000915807, ENST00000915808, ENST00000951697

RefSeq mRNA: 2 — MANE Select: NM_145055 NM_001008239, NM_145055

CCDS: CCDS42430, CCDS42431

Canonical transcript exons

ENST00000615052 — 5 exons

ExonStartEnd
ENSE000037177314625369746253823
ENSE000037183404621581146216595
ENSE000037347194624000546240187
ENSE000037360854617403446174330
ENSE000037474744626292946266992

Expression profiles

Bgee: expression breadth ubiquitous, 268 present calls, max score 97.48.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 16.6692 / max 684.2413, expressed in 1799 samples.

FANTOM5 promoters (5 alternative TSS)

Promoter IDTPM avgSamples expressed
1701527.72871724
1701514.70721643
1701491.8747807
1701531.4916467
1701480.8671480

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
buccal mucosa cellCL:000233697.48gold quality
lower esophagus mucosaUBERON:003583496.04gold quality
esophagus squamous epitheliumUBERON:000692094.77gold quality
biceps brachiiUBERON:000150793.33gold quality
skeletal muscle tissue of biceps brachiiUBERON:000450292.80gold quality
epithelium of esophagusUBERON:000197692.64gold quality
heart right ventricleUBERON:000208091.94gold quality
caput epididymisUBERON:000435891.52gold quality
skeletal muscle tissue of rectus abdominisUBERON:000451191.23gold quality
palpebral conjunctivaUBERON:000181291.08gold quality
oral cavityUBERON:000016790.68gold quality
esophagus mucosaUBERON:000246990.34gold quality
cauda epididymisUBERON:000436090.19gold quality
pharyngeal mucosaUBERON:000035590.18gold quality
Brodmann (1909) area 23UBERON:001355489.86gold quality
corpus epididymisUBERON:000435989.35gold quality
amniotic fluidUBERON:000017389.32gold quality
body of tongueUBERON:001187688.73gold quality
squamous epitheliumUBERON:000691488.43gold quality
upper leg skinUBERON:000426288.34gold quality
superior surface of tongueUBERON:000737188.06gold quality
pigmented layer of retinaUBERON:000178287.97gold quality
tongueUBERON:000172387.52gold quality
skin of hipUBERON:000155487.26gold quality
tonsilUBERON:000237287.22gold quality
gastrocnemiusUBERON:000138887.06gold quality
muscle of legUBERON:000138386.82gold quality
trabecular bone tissueUBERON:000248386.68gold quality
colonic epitheliumUBERON:000039786.41gold quality
epithelium of nasopharynxUBERON:000195186.28gold quality

Single-cell (SCXA)

Detected in 2 experiment(s), a significant marker in 0.

ExperimentMarker?Max mean expression
E-MTAB-6386no671.93
E-ANND-3no4.36

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

256 targeting ARK2N, 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-3613-3P100.0076.367965
HSA-MIR-5011-5P100.0083.465820
HSA-MIR-1277-5P100.0073.955056
HSA-MIR-3646100.0073.565283
HSA-MIR-4795-3P100.0074.624024
HSA-MIR-9-5P100.0072.282361
HSA-MIR-3163100.0077.238605
HSA-MIR-4692100.0067.322066
HSA-MIR-3064-3P100.0070.091254
HSA-MIR-3120-5P100.0065.56965
HSA-MIR-656-3P100.0072.152788
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-126-5P100.0072.713180
HSA-MIR-4510100.0066.602050
HSA-MIR-6127100.0066.762188
HSA-MIR-6129100.0066.462080
HSA-MIR-6130100.0066.692012
HSA-MIR-6133100.0066.482064
HSA-MIR-4262100.0073.263931
HSA-MIR-4533100.0069.482758
HSA-MIR-450A-1-3P100.0069.331837
HSA-MIR-6833-3P100.0070.633197
HSA-MIR-4476100.0068.182030
HSA-MIR-6876-5P100.0067.682126
HSA-MIR-4768-5P100.0069.492861
HSA-MIR-318599.9968.121959
HSA-MIR-366299.9973.825684

Literature-anchored findings (GeneRIF, showing 2)

  • ARKL1 binds CK2beta through the KSSR motif and this involves a polyserine sequence resembling the CK2beta binding sequence in EBNA1. (PMID:24216761)
  • Phosphoproteomics of three exercise modalities identifies canonical signaling and C18ORF25 as an AMPK substrate regulating skeletal muscle function. (PMID:35882232)

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_rerioark2nENSDARG00000046071
mus_musculusArk2nENSMUSG00000047466
rattus_norvegicusArk2nENSRNOG00000017215
drosophila_melanogasterCG6923FBGN0037944
caenorhabditis_eleganstoe-4WBGENE00012194

Paralogs (2): ARK2C (ENSG00000141622), RNF111 (ENSG00000157450)

Protein

Protein identifiers

Protein ARK2NQ96B23 (reviewed: Q96B23)

Alternative names: ARKadia-like protein 1, Arkadia (RNF111) N-terminal like PKA signaling regulator protein 2N

All UniProt accessions (4): Q96B23, A0A087WVF1, K7EQH1, K7ER64

UniProt curated annotations — full annotation on UniProt →

Function. AMPK substrate important for exercise capacity and skeletal muscle function. Required for normal contraction-induced signaling. (Microbial infection) Upon Epstein-Barr virus (EBV) infection, suppresses viral BZLF1 expression and subsequent EBV reactivation by interacting with JUN and inhibiting its transcriptional activator activity on BZLF1 Z promoter.

Subunit / interactions. Interacts with CSNK2B (via KSSR). Interacts with JUN; the interaction is mediated by CSNK2B.

Subcellular location. Nucleus.

Tissue specificity. Expressed in skeletal muscle.

Post-translational modifications. Phosphorylated at Ser-67 by AMPK. In skeletal muscle, phosphorylation is induced by exercise and seems to increase muscle contractile function.

Isoforms (2)

UniProt IDNamesCanonical?
Q96B23-11yes
Q96B23-22

RefSeq proteins (2): NP_001008240, NP_659492* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR029306RNF111_NDomain
IPR051073ZNRF3_Arkadia_E3_ligasesFamily

Pfam: PF15303

UniProt features (26 total): modified residue 9, compositionally biased region 5, region of interest 3, mutagenesis site 2, sequence conflict 2, chain 1, cross-link 1, splice variant 1, sequence variant 1, coiled-coil region 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q96B23-F154.670.04

Functional residue map

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

Post-translational modifications (10): 66, 67, 143, 145, 147, 327, 328, 330, 347, 358

Mutagenesis-validated functional residues (2):

PositionPhenotype
66–67loss of phosphorylation by ampk. decreases muscle specific force.
66–67increased phosphorylation. increases muscle specific force.

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 201 (showing top): AAGCAAT_MIR137, TGCACTT_MIR519C_MIR519B_MIR519A, GOBP_NEGATIVE_REGULATION_OF_VIRAL_PROCESS, GOBP_MACROMOLECULE_CATABOLIC_PROCESS, BROWNE_HCMV_INFECTION_16HR_UP, ATGCAGT_MIR217, FOXO1_01, BROWNE_HCMV_INFECTION_12HR_UP, ATGTTAA_MIR302C, TCF4_Q5, GGGCATT_MIR365, WTGAAAT_UNKNOWN, GOBP_VIRAL_LIFE_CYCLE, MORF_EPHA7, TTGGAGA_MIR5155P_MIR519E

GO Biological Process (4): ubiquitin-dependent protein catabolic process (GO:0006511), negative regulation of viral life cycle (GO:1903901), release from viral latency (GO:0019046), negative regulation of DNA-templated transcription (GO:0045892)

GO Molecular Function (3): transcription corepressor activity (GO:0003714), ubiquitin protein ligase activity (GO:0061630), protein binding (GO:0005515)

GO Cellular Component (2): chromatin (GO:0000785), nucleus (GO:0005634)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
protein ubiquitination1
modification-dependent protein catabolic process1
viral life cycle1
negative regulation of viral process1
regulation of viral life cycle1
viral process1
latent virus replication1
DNA-templated transcription1
regulation of DNA-templated transcription1
negative regulation of RNA biosynthetic process1
transcription coregulator activity1
negative regulation of DNA-templated transcription1
ubiquitin-protein transferase activity1
ubiquitin-like protein ligase activity1
binding1
chromosome1
cellular anatomical structure1
intracellular membrane-bounded organelle1

Protein interactions and networks

STRING

706 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
ARK2NARK2CQ6ZSG1645
ARK2NFAM240BA0A1B0GVZ2507
ARK2NTMEM200CA6NKL6479
ARK2NA6NLF2A6NLF2448
ARK2NQ3MI93Q3MI93417
ARK2NTMEM200AQ86VY9391
ARK2NRHNO1Q9BSD3368
ARK2NFUNDC2Q9BWH2361
ARK2NLOXHD1Q8IVV2341
ARK2NIER3IP1Q9Y5U9324
ARK2NZNF764Q96H86323
ARK2NFRG2CA6NGY1322
ARK2NHOATZQ6PI97310
ARK2NHDHD2Q9H0R4305
ARK2NQ8NG57Q8NG57300

IntAct

131 interactions, top by confidence:

ABTypeScore
ATF2JUNpsi-mi:“MI:0914”(association)0.950
MED17MED19psi-mi:“MI:0914”(association)0.840
CSNK2A1EIF3Jpsi-mi:“MI:0914”(association)0.810
SUMO1ARK2Npsi-mi:“MI:0915”(physical association)0.790
ARK2NSUMO1psi-mi:“MI:0915”(physical association)0.790
SUMO1ARK2Npsi-mi:“MI:0407”(direct interaction)0.790
CSNK2A2EIF3Jpsi-mi:“MI:0914”(association)0.790
INO80ETFPTpsi-mi:“MI:0914”(association)0.790
NRP1CSNK2A2psi-mi:“MI:0914”(association)0.790
CSNK2BRPS6KA5psi-mi:“MI:0914”(association)0.660
CSNK2BNMT2psi-mi:“MI:0914”(association)0.660
RPS6KA3ROCK2psi-mi:“MI:0914”(association)0.640
CSNK2BRPS6KA4psi-mi:“MI:0914”(association)0.640
CAMKVAP3B1psi-mi:“MI:0914”(association)0.640
CSNK2A2PES1psi-mi:“MI:0914”(association)0.640
HOXC9AHCYL1psi-mi:“MI:0914”(association)0.640
TULP3GGPS1psi-mi:“MI:0914”(association)0.640
ARK2NSUMO1P1psi-mi:“MI:0915”(physical association)0.560
TAX1BP1ARK2Npsi-mi:“MI:0915”(physical association)0.560
ARK2NDDIT4Lpsi-mi:“MI:0915”(physical association)0.560
ARK2NMCRS1psi-mi:“MI:0915”(physical association)0.560
ARK2NJAKMIP1psi-mi:“MI:0915”(physical association)0.560
RNF4ARK2Npsi-mi:“MI:0915”(physical association)0.560
UBE2IARK2Npsi-mi:“MI:0915”(physical association)0.560

BioGRID (173): C18orf25 (Two-hybrid), SUMO1P1 (Two-hybrid), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Two-hybrid), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS), C18orf25 (Affinity Capture-MS)

ESM2 similar proteins: A2VE56, A6QPH9, I3LHS8, O08781, O14545, O54836, P0C6S7, Q14CM0, Q3SZY7, Q3U2E2, Q497H0, Q4R3D6, Q4R970, Q58D05, Q5F3F2, Q5FWF5, Q5R7S6, Q5RDJ2, Q5U2M7, Q5VT97, Q66J85, Q68FE8, Q69Z69, Q6DGF4, Q6FIF0, Q6N043, Q6P2K3, Q70EL2, Q7Z6G8, Q8BIZ1, Q8IWR0, Q8K214, Q8K387, Q8N7W2, Q8N9Z9, Q8NA31, Q8ND82, Q8QFX1, Q91YD3, Q96B23

Diamond homologs: Q5R4B7, Q8BH50, Q96B23, Q5R476, Q66J97, Q6NRV8, Q6ZNA4, Q90ZT7, Q99ML9

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 149 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
SPOP-mediated proteasomal degradation of PD-L1(CD274)511.3×6e-03
Regulation of PTEN stability and activity59.1×9e-03
Toll-like Receptor Cascades78.6×4e-03
UCH proteinases67.4×9e-03
Regulation of TP53 Activity through Phosphorylation67.0×9e-03
Viral Infection Pathways134.0×4e-03
Infectious disease163.9×2e-03

GO biological processes:

GO termPartnersFoldFDR
regulation of cell cycle116.0×1e-03
protein phosphorylation105.0×8e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic1
Likely pathogenic0
Uncertain significance2
Likely benign0
Benign0

Top pathogenic / likely-pathogenic (1)

Variant IDHGVSClassification
1180529GRCh37/hg19 18q11.2-23(chr18:23626739-78014976)x3Pathogenic

SpliceAI

1869 predictions. Top by Δscore:

VariantEffectΔscore
18:46174331:GTGAG:Gdonor_loss1.0000
18:46216602:G:GTdonor_gain1.0000
18:46224233:T:TAdonor_gain1.0000
18:46224234:A:AAdonor_gain1.0000
18:46253692:CTCA:Cacceptor_loss1.0000
18:46253694:CAG:Cacceptor_loss1.0000
18:46253695:A:AGacceptor_gain1.0000
18:46253695:AGGT:Aacceptor_loss1.0000
18:46253696:G:GGacceptor_gain1.0000
18:46253696:GGT:Gacceptor_gain1.0000
18:46253696:GGTC:Gacceptor_gain1.0000
18:46253789:G:GTdonor_gain1.0000
18:46253820:CAAGG:Cdonor_loss1.0000
18:46253821:AAG:Adonor_loss1.0000
18:46253822:AGGT:Adonor_loss1.0000
18:46253824:G:GAdonor_loss1.0000
18:46253825:T:Adonor_loss1.0000
18:46254659:T:Gacceptor_gain1.0000
18:46254661:T:Gacceptor_gain1.0000
18:46254662:A:AGacceptor_gain1.0000
18:46263099:GGC:Gdonor_gain1.0000
18:46263100:GCG:Gdonor_gain1.0000
18:46174332:T:Adonor_loss0.9900
18:46212817:GCGTT:Gdonor_gain0.9900
18:46215806:TACA:Tacceptor_loss0.9900
18:46215809:AGGT:Aacceptor_loss0.9900
18:46216591:ACCAG:Adonor_loss0.9900
18:46216592:CCAG:Cdonor_loss0.9900
18:46216593:CAG:Cdonor_loss0.9900
18:46216594:AGGT:Adonor_loss0.9900

AlphaMissense

2633 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
18:46216441:G:CR187S1.000
18:46216441:G:TR187S1.000
18:46216420:G:CK180N0.999
18:46216420:G:TK180N0.999
18:46216426:G:CR182S0.999
18:46216426:G:TR182S0.999
18:46216440:G:CR187T0.999
18:46216440:G:TR187M0.999
18:46216449:G:CR190P0.999
18:46216490:A:CS204R0.999
18:46216492:T:AS204R0.999
18:46216492:T:GS204R0.999
18:46216493:A:CS205R0.999
18:46216495:T:AS205R0.999
18:46216495:T:GS205R0.999
18:46216499:A:CS207R0.999
18:46216501:T:AS207R0.999
18:46216501:T:GS207R0.999
18:46263078:T:CL392P0.999
18:46216178:A:CS100R0.998
18:46216180:T:AS100R0.998
18:46216180:T:GS100R0.998
18:46216425:G:CR182T0.998
18:46216434:T:CL185P0.998
18:46216437:T:CL186P0.998
18:46216193:G:CD105H0.997
18:46216345:G:CK155N0.997
18:46216345:G:TK155N0.997
18:46216425:G:TR182M0.997
18:46216447:A:CK189N0.997

dbSNP variants (sampled 300 via entrez): RS1000039705 (18:46172436 G>A), RS1000088452 (18:46249990 C>G,T), RS1000095526 (18:46258083 T>C), RS1000113210 (18:46200688 T>C), RS1000130261 (18:46207056 A>G), RS1000186152 (18:46234801 A>G), RS1000186901 (18:46194542 G>A,T), RS1000244482 (18:46244697 G>A), RS1000346177 (18:46200559 GC>G), RS1000373965 (18:46195186 A>C,G), RS1000420777 (18:46245025 G>A), RS1000451243 (18:46264582 A>G), RS1000466994 (18:46189288 C>T), RS1000514444 (18:46183183 G>A), RS1000535341 (18:46230738 C>T)

Disease associations

OMIM: gene MIM:621303 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

46 associations (top):

StudyTraitp-value
GCST003540_7Clinical laboratory measurements2.000000e-10
GCST003540_8Clinical laboratory measurements2.000000e-13
GCST004599_132Mean platelet volume2.000000e-13
GCST004601_179Red blood cell count5.000000e-25
GCST004602_253Mean corpuscular volume5.000000e-74
GCST004610_86White blood cell count5.000000e-10
GCST004611_139High light scatter reticulocyte count7.000000e-10
GCST004613_69Sum neutrophil eosinophil counts8.000000e-10
GCST004614_69Granulocyte count2.000000e-09
GCST004620_33Sum basophil neutrophil counts3.000000e-09
GCST004621_201Red cell distribution width1.000000e-109
GCST004621_202Red cell distribution width9.000000e-121
GCST004622_65Reticulocyte count3.000000e-13
GCST004626_152Myeloid white cell count1.000000e-10
GCST004629_38Neutrophil count2.000000e-09
GCST004630_224Mean corpuscular hemoglobin3.000000e-79
GCST005993_18Mean corpuscular hemoglobin7.000000e-22
GCST006011_56Mean corpuscular volume3.000000e-22
GCST006804_16Red cell distribution width5.000000e-85
GCST006996_3Cerebrospinal AB1-42 levels in mild cognitive impairment3.000000e-06
GCST007012_5Cerebrospinal fluid AB1-42 levels1.000000e-07
GCST90002381_549Eosinophil count3.000000e-09
GCST90002384_434Hemoglobin2.000000e-12
GCST90002385_337High light scatter reticulocyte count6.000000e-10
GCST90002386_86High light scatter reticulocyte percentage of red cells3.000000e-28
GCST90002387_212Immature fraction of reticulocytes4.000000e-13
GCST90002389_248Lymphocyte percentage of white cells6.000000e-09
GCST90002390_552Mean corpuscular hemoglobin9.000000e-46
GCST90002390_553Mean corpuscular hemoglobin7.000000e-40
GCST90002391_100Mean corpuscular hemoglobin concentration5.000000e-20

EFO canonical traits (15, from GWAS)

EFO IDTrait name
EFO:0004297clinical laboratory measurement
EFO:0004527mean corpuscular hemoglobin
EFO:0004305erythrocyte count
EFO:0007986reticulocyte count
EFO:0004833neutrophil count
EFO:0004842eosinophil count
EFO:0007987granulocyte count
EFO:0005090basophil count
EFO:0009188Red cell distribution width
EFO:0004670beta-amyloid 1-42 measurement
EFO:0004509hemoglobin measurement
EFO:0007993lymphocyte percentage of leukocytes
EFO:0004528mean corpuscular hemoglobin concentration
EFO:0005091monocyte count
EFO:0010701mean reticulocyte volume

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Valproic Acidaffects cotreatment, increases expression, affects expression7
GSK-J4increases expression1
FR900359affects phosphorylation1
TAK-243increases sumoylation1
methylmercuric chlorideincreases expression1
deoxynivalenolincreases expression1
arsenitedecreases methylation1
sodium arseniteincreases abundance, increases expression1
coumarindecreases phosphorylation1
pentabromodiphenyl etherincreases expression1
4-(5-benzo(1,3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamideaffects cotreatment, increases expression1
dorsomorphinaffects cotreatment, increases expression1
jinfukangdecreases expression1
PCI 5002affects cotreatment, increases expression1
Sunitinibincreases expression1
Acetaminophenincreases expression1
Arsenicincreases abundance, increases expression1
Benzo(a)pyreneincreases expression1
Caffeineaffects phosphorylation1
Demecolcineincreases expression1
Doxorubicindecreases expression1
Drugs, Chinese Herbalincreases expression1
Enzyme Inhibitorsdecreases activity, increases O-linked glycosylation1
Ethyl Methanesulfonateincreases expression1
Formaldehydeincreases expression1
Ivermectindecreases expression1
Leaddecreases expression1
Methyl Methanesulfonateincreases expression1
Naphthoquinonesincreases expression1
Thiramincreases expression1

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.