S100A13

gene
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Summary

S100A13 (S100 calcium binding protein A13, HGNC:10490) is a protein-coding gene on chromosome 1q21.3, encoding Protein S100-A13 (Q99584). Plays a role in the export of proteins that lack a signal peptide and are secreted by an alternative pathway.

The protein encoded by this gene is a member of the S100 family of proteins containing 2 EF-hand calcium-binding motifs. S100 proteins are localized in the cytoplasm and/or nucleus of a wide range of cells, and involved in the regulation of a number of cellular processes such as cell cycle progression and differentiation. S100 genes include at least 13 members which are located as a cluster on chromosome 1q21. This protein is widely expressed in various types of tissues with a high expression level in thyroid gland. In smooth muscle cells, this protein co-expresses with other family members in the nucleus and in stress fibers, suggesting diverse functions in signal transduction. Multiple alternatively spliced transcript variants encoding the same protein have been found for this gene.

Source: NCBI Gene 6284 — RefSeq curated summary.

At a glance

  • GWAS associations: 1
  • Clinical variants (ClinVar): 28 total
  • MANE Select transcript: NM_001024211

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:10490
Approved symbolS100A13
NameS100 calcium binding protein A13
Location1q21.3
Locus typegene with protein product
StatusApproved
Ensembl geneENSG00000189171
Ensembl biotypeprotein_coding
OMIM601989
Entrez6284

Gene structure

Transcript identifiers

Ensembl transcripts: 44 — 41 protein_coding, 3 protein_coding_CDS_not_defined

ENST00000339556, ENST00000392622, ENST00000392623, ENST00000440685, ENST00000469931, ENST00000472233, ENST00000476133, ENST00000484413, ENST00000491177, ENST00000497086, ENST00000607839, ENST00000883331, ENST00000883332, ENST00000883333, ENST00000883334, ENST00000883335, ENST00000883336, ENST00000883337, ENST00000883338, ENST00000883339, ENST00000883340, ENST00000883341, ENST00000883342, ENST00000914275, ENST00000914276, ENST00000914277, ENST00000914278, ENST00000914279, ENST00000914280, ENST00000914281, ENST00000914282, ENST00000914283, ENST00000914284, ENST00000914285, ENST00000914286, ENST00000914287, ENST00000914288, ENST00000914289, ENST00000914290, ENST00000914291, ENST00000914292, ENST00000972165, ENST00000972166, ENST00000972167

RefSeq mRNA: 5 — MANE Select: NM_001024211 NM_001024210, NM_001024211, NM_001024212, NM_001024213, NM_005979

CCDS: CCDS30874

Canonical transcript exons

ENST00000476133 — 3 exons

ExonStartEnd
ENSE00001447797153618799153619038
ENSE00003916833153627483153627505
ENSE00004031446153626320153626533

Expression profiles

Bgee: expression breadth ubiquitous, 153 present calls, max score 99.42.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 57.4385 / max 332.3969, expressed in 1814 samples.

FANTOM5 promoters (17 alternative TSS)

Promoter IDTPM avgSamples expressed
1469922.18721466
1470018.75161537
147077.97151749
147012.34421260
146982.0136850
146971.6002672
147030.7583145
147020.5764376
146930.2642113
146940.2542108

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
right lobe of thyroid glandUBERON:000111999.42gold quality
left lobe of thyroid glandUBERON:000112099.40gold quality
thyroid glandUBERON:000204699.38gold quality
calcaneal tendonUBERON:000370199.36gold quality
substantia nigraUBERON:000203899.30gold quality
putamenUBERON:000187499.19gold quality
C1 segment of cervical spinal cordUBERON:000646999.17gold quality
amygdalaUBERON:000187699.16gold quality
spinal cordUBERON:000224099.13gold quality
temporal lobeUBERON:000187199.09gold quality
right uterine tubeUBERON:000130299.07gold quality
metanephros cortexUBERON:001053399.00gold quality
caudate nucleusUBERON:000187398.98gold quality
nucleus accumbensUBERON:000188298.98gold quality
hypothalamusUBERON:000189898.94gold quality
right atrium auricular regionUBERON:000663198.91gold quality
mucosa of stomachUBERON:000119998.87gold quality
apex of heartUBERON:000209898.87gold quality
subcutaneous adipose tissueUBERON:000219098.83gold quality
adipose tissueUBERON:000101398.76gold quality
thoracic mammary glandUBERON:000520098.76gold quality
Ammon’s hornUBERON:000195498.70gold quality
omental fat padUBERON:001041498.70gold quality
stromal cell of endometriumCL:000225598.64gold quality
endometrium epitheliumUBERON:000481198.58gold quality
muscle layer of sigmoid colonUBERON:003580598.53gold quality
sigmoid colonUBERON:000115998.50gold quality
right lungUBERON:000216798.43gold quality
minor salivary glandUBERON:000183098.42gold quality
fallopian tubeUBERON:000388998.42gold quality

Single-cell (SCXA)

Detected in 21 experiment(s), a significant marker in 20.

ExperimentMarker?Max mean expression
E-MTAB-8060yes530.62
E-GEOD-109979yes269.74
E-MTAB-6701yes126.22
E-HCAD-1yes80.03
E-MTAB-8410yes64.96
E-MTAB-10553yes42.47
E-ANND-3yes41.60
E-GEOD-134144yes36.28
E-CURD-46yes35.02
E-MTAB-10287yes33.31
E-HCAD-10yes27.30
E-GEOD-81547yes23.39
E-MTAB-7316yes22.57
E-CURD-112yes17.87
E-HCAD-9yes17.24

Regulation

Is transcription factor: no

Upstream regulators (CollecTRI, top): PBRM1

Literature-anchored findings (GeneRIF, showing 18)

  • detected in both cells and fibers of the hippocampus at 12 weeks gestation, slightly stronger at 20 weeks, and then decreased with age. In the temporal cortex, strong in all cellular layers at 12 to 24 weeks, declined with age from 28 weeks onwards. (PMID:12645008)
  • Stress-induced export of IL-1alpha involves the intracellular association with the Cu2+-binding protein, S100A13; the expression of a S100A13 mutant functions as a dominant-negative repressor of IL-1alpha release. (PMID:12746488)
  • S100A13 protein translocation in response to extracellular S100 is mediated by receptor for advanced glycation endproducts in human endothelial cells (PMID:15033494)
  • data show that the expression of endoglin and S100A13 protein corresponds to the activation of the endothelial cells in the process of endometriotic angiogenesis (PMID:15821778)
  • In human astrocytic gliomas, S100A13 was significantly up-regulated in high-grade vascularized gliomas. Moreover, S100A13 expression significantly correlated with microvessel density and tumour grading. (PMID:16773219)
  • Human S100A13 was heterologously expressed in Escherichia coli, purified and crystallized by the hanging-drop vapour-diffusion method. (PMID:17077500)
  • S100A13 is a homodimer with four EF-hand motifs in an asymmetric unit, displaying a folding pattern similar to other S100 members. S100A13 has the unique structural feature with all alpha-helices being amphiphilic. (PMID:17374362)
  • Despite the high similarity of the backbone conformation in each protomer, the crystal structures of human S100A13 at pH 7.5 and at pH 6.0 exhibit recognizable differences in the relative orientation of the protomers within the dimer (PMID:18259052)
  • S100A13 is expressed in melanocytic lesions when the angiogenic switch occurs and it may cooperate with VEGF-A in supporting the formation of new blood vessels, favoring the shift from radial to vertical tumor growth. (PMID:20208480)
  • S100A13 promotes the release of FGF-1 protein, but does not affect the transportation of FGF-1 protein in human umbilical vein endothelial cells. (PMID:20863990)
  • the IL1alpha-S100A13 tetrameric complex is the key complex formed during the non-classical pathway of IL1alpha release (PMID:21270123)
  • S100A13 is involved in cutaneous malignant melanoma resistance to DTIC/TMZ. (PMID:24722184)
  • S100A13 interacts with the C2 domain of RAGE. (PMID:24982031)
  • This is the first report for the association between HMGA1 and S100A13 expression in the modulation of thyroid cancer growth and invasion. (PMID:27008379)
  • High S100A13 expression is closely associated with high intratumoral angiogenesis and poor prognosis in patients with stage I NSCLC. Immunohistochemical evaluation of S100A13 expression, along with an examination of the perioperative extent of angiolymphatic invasion, has value for predicting prognosis. (PMID:30047626)
  • These findings unveil a critical role of the non-classical secretory pathway of IL-1alpha in cellular senescence and SASP regulation. (PMID:30670674)
  • An atypical pulmonary fibrosis is associated with co-inheritance of mutations in the calcium binding protein genes S100A3 and S100A13. (PMID:31073086)
  • Genome-wide analysis of DNA methylation identifies S100A13 as an epigenetic biomarker in individuals with chronic (>/= 30 years) type 2 diabetes without diabetic retinopathy. (PMID:32493412)

Cross-species orthologs

4 orthologs

OrganismSymbolGene ID
danio_rerios100v1ENSDARG00000070427
danio_rerios100v2ENSDARG00000070702
mus_musculusS100a13ENSMUSG00000042312
rattus_norvegicusS100a13ENSRNOG00000079311

Paralogs (21): CRNN (ENSG00000143536), S100A8 (ENSG00000143546), S100A7 (ENSG00000143556), S100B (ENSG00000160307), S100A1 (ENSG00000160678), S100A11 (ENSG00000163191), S100A9 (ENSG00000163220), S100A12 (ENSG00000163221), S100P (ENSG00000163993), S100G (ENSG00000169906), S100Z (ENSG00000171643), S100A7A (ENSG00000184330), S100A3 (ENSG00000188015), S100A16 (ENSG00000188643), SNTN (ENSG00000188817), S100A14 (ENSG00000189334), S100A4 (ENSG00000196154), S100A5 (ENSG00000196420), S100A2 (ENSG00000196754), S100A10 (ENSG00000197747), S100A6 (ENSG00000197956)

Protein

Protein identifiers

Protein S100-A13Q99584 (reviewed: Q99584)

Alternative names: S100 calcium-binding protein A13

All UniProt accessions (1): Q99584

UniProt curated annotations — full annotation on UniProt →

Function. Plays a role in the export of proteins that lack a signal peptide and are secreted by an alternative pathway. Binds two calcium ions per subunit. Binds one copper ion. Binding of one copper ion does not interfere with calcium binding. Required for the copper-dependent stress-induced export of IL1A and FGF1. The calcium-free protein binds to lipid vesicles containing phosphatidylserine, but not to vesicles containing phosphatidylcholine.

Subunit / interactions. Homodimer. Part of a copper-dependent multiprotein complex containing S100A13, FGF1 and SYT1. Interacts with FGF1 and SYT1. Interacts with IL1A.

Subcellular location. Cytoplasm. Secreted.

Tissue specificity. Expressed in heart and skeletal muscle.

Similarity. Belongs to the S-100 family.

RefSeq proteins (5): NP_001019381, NP_001019382, NP_001019383, NP_001019384, NP_005970 (=MANE)

Domains & families (InterPro)

IDNameType
IPR011992EF-hand-dom_pairHomologous_superfamily
IPR013787S100_Ca-bd_subDomain

Pfam: PF01023

UniProt features (21 total): binding site 7, helix 6, strand 4, chain 1, domain 1, turn 1, modified residue 1

Structure

Experimental structures (PDB)

12 structures.

PDBMethodResolution (Å)
2EGDX-RAY DIFFRACTION1.8
2H2KX-RAY DIFFRACTION2
1YURSOLUTION NMR
1YUSSOLUTION NMR
1YUTSOLUTION NMR
1YUUSOLUTION NMR
2K8MSOLUTION NMR
2KI4SOLUTION NMR
2KI6SOLUTION NMR
2KOTSOLUTION NMR
2L5XSOLUTION NMR
2LE9SOLUTION NMR

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q99584-F180.910.09

Functional residue map

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

Ligand- & substrate-binding residues (7): 32; 37; 64; 66; 68; 70; 75

Post-translational modifications (1): 32

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 241 (showing top): CHIARADONNA_NEOPLASTIC_TRANSFORMATION_KRAS_DN, KAAB_HEART_ATRIUM_VS_VENTRICLE_UP, GOBP_CANONICAL_NF_KAPPAB_SIGNAL_TRANSDUCTION, GRAESSMANN_APOPTOSIS_BY_DOXORUBICIN_UP, GRAESSMANN_RESPONSE_TO_MC_AND_DOXORUBICIN_UP, DACOSTA_UV_RESPONSE_VIA_ERCC3_UP, GOBP_POSITIVE_REGULATION_OF_CYTOKINE_PRODUCTION, GOBP_VESICLE_MEDIATED_TRANSPORT, GOBP_INTERLEUKIN_1_PRODUCTION, GOBP_LEUKOCYTE_MEDIATED_IMMUNITY, BOYLAN_MULTIPLE_MYELOMA_D_DN, GOLDRATH_ANTIGEN_RESPONSE, GOBP_CELL_ACTIVATION_INVOLVED_IN_IMMUNE_RESPONSE, BROWNE_HCMV_INFECTION_48HR_DN, GOBP_MAST_CELL_ACTIVATION

GO Biological Process (5): positive regulation of cytokine production (GO:0001819), protein transport (GO:0015031), positive regulation of interleukin-1 alpha production (GO:0032730), positive regulation of canonical NF-kappaB signal transduction (GO:0043123), mast cell degranulation (GO:0043303)

GO Molecular Function (10): copper ion binding (GO:0005507), calcium ion binding (GO:0005509), zinc ion binding (GO:0008270), lipid binding (GO:0008289), fibroblast growth factor binding (GO:0017134), protein homodimerization activity (GO:0042803), calcium-dependent protein binding (GO:0048306), RAGE receptor binding (GO:0050786), protein binding (GO:0005515), metal ion binding (GO:0046872)

GO Cellular Component (9): extracellular region (GO:0005576), obsolete extracellular space (GO:0005615), nucleus (GO:0005634), nucleoplasm (GO:0005654), nucleolus (GO:0005730), cytoplasm (GO:0005737), cytosol (GO:0005829), plasma membrane (GO:0005886), perinuclear region of cytoplasm (GO:0048471)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure5
transition metal ion binding2
binding2
nuclear lumen2
cytoplasm2
cytokine production1
regulation of cytokine production1
positive regulation of gene expression1
positive regulation of multicellular organismal process1
transport1
intracellular protein localization1
establishment of protein localization1
interleukin-1 alpha production1
regulation of interleukin-1 alpha production1
positive regulation of interleukin-1 production1
canonical NF-kappaB signal transduction1
regulation of canonical NF-kappaB signal transduction1
positive regulation of intracellular signal transduction1
mast cell activation involved in immune response1
mast cell mediated immunity1
lysosome localization1
leukocyte degranulation1
establishment of organelle localization1
metal ion binding1
growth factor binding1
identical protein binding1
protein dimerization activity1
calcium ion binding1
protein binding1
signaling receptor binding1
cation binding1
intracellular membrane-bounded organelle1
intracellular membraneless organelle1
intracellular anatomical structure1
membrane1
cell periphery1

Protein interactions and networks

STRING

1026 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
S100A13SYT1P21579982
S100A13FGF1P05230922
S100A13IL1AP01583818
S100A13PBRM1Q86U86808
S100A13SPHK1Q9NYA1763
S100A13CRABP2P29373742
S100A13S100A6P06703717
S100A13S100A3P33764700
S100A13S100A10P08206685
S100A13S100A2P29034680
S100A13S100ZQ8WXG8671
S100A13CLEC1BQ9P126662
S100A13HRNRQ86YZ3643
S100A13S100A7P31151584
S100A13S100BP04271570

IntAct

57 interactions, top by confidence:

ABTypeScore
KIFAP3KIF3Cpsi-mi:“MI:0914”(association)0.640
SDC2PDPK1psi-mi:“MI:0914”(association)0.640
PLEKHF2S100A13psi-mi:“MI:0915”(physical association)0.560
S100A13PLEKHF2psi-mi:“MI:0915”(physical association)0.560
S100A13S100A14psi-mi:“MI:0915”(physical association)0.560
TNFS100A13psi-mi:“MI:0407”(direct interaction)0.560
S100A13TNFpsi-mi:“MI:0407”(direct interaction)0.560
SNRNP27UBA6psi-mi:“MI:0914”(association)0.530
MGST3GAPDHSpsi-mi:“MI:0914”(association)0.530
CCL5C4Apsi-mi:“MI:0914”(association)0.530
S100A13TP53psi-mi:“MI:0407”(direct interaction)0.440
S100A13SLC8A1psi-mi:“MI:0407”(direct interaction)0.440
S100A13EEF1Gpsi-mi:“MI:0915”(physical association)0.400
FER1L5psi-mi:“MI:0915”(physical association)0.400
TK2psi-mi:“MI:0915”(physical association)0.400
S100A13S100A13psi-mi:“MI:0915”(physical association)0.370
S100A13IGBP1psi-mi:“MI:0915”(physical association)0.370
IRF9S100A13psi-mi:“MI:0915”(physical association)0.370
ESYT2psi-mi:“MI:0914”(association)0.350
E5ESYT2psi-mi:“MI:0914”(association)0.350
APPESYT2psi-mi:“MI:0914”(association)0.350
SDC2METTL8psi-mi:“MI:0914”(association)0.350
SPRY2SNX3psi-mi:“MI:0914”(association)0.350

BioGRID (55): S100A13 (Two-hybrid), PLEKHF2 (Two-hybrid), S100A13 (Affinity Capture-MS), S100A13 (Affinity Capture-MS), S100A13 (Affinity Capture-MS), S100A13 (Affinity Capture-MS), S100A13 (Affinity Capture-MS), S100A13 (Affinity Capture-MS), S100A13 (Biochemical Activity), S100A13 (Affinity Capture-Western), S100A13 (Two-hybrid), S100A14 (Two-hybrid), SYT1 (Co-purification), FGF1 (Co-purification), S100A13 (Proximity Label-MS)

ESM2 similar proteins: O77691, O77791, P02638, P02639, P04271, P04354, P04467, P04631, P05937, P05942, P05964, P06702, P06703, P07091, P07171, P10462, P12658, P14069, P23297, P24479, P25815, P26447, P27004, P28318, P29034, P30801, P31151, P35466, P35467, P50114, P56565, P79105, P79880, P80310, P80511, P97352, Q0VCM0, Q14ST5, Q28050, Q2EN75

Diamond homologs: A7K6Y9, O77691, O77791, P02632, P02633, P02634, P02638, P02639, P04271, P04631, P05942, P05964, P06702, P06703, P07091, P10462, P14069, P20930, P23297, P24480, P25815, P26447, P27003, P28318, P28783, P29034, P29377, P30801, P33763, P33764, P35466, P35467, P50114, P50116, P50117, P56565, P62818, P62819, P63083, P63084

SIGNOR signaling

1 interactions.

AEffectBMechanism
PBRM1“up-regulates quantity by expression”S100A13“transcriptional regulation”

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance16
Likely benign2
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

1121 predictions. Top by Δscore:

VariantEffectΔscore
1:153619034:ACATC:Aacceptor_gain1.0000
1:153619035:CATC:Cacceptor_gain1.0000
1:153619035:CATCC:Cacceptor_gain1.0000
1:153619036:ATC:Aacceptor_gain1.0000
1:153619037:TC:Tacceptor_gain1.0000
1:153619038:CC:Cacceptor_gain1.0000
1:153619039:C:CCacceptor_gain1.0000
1:153619039:CTGA:Cacceptor_loss1.0000
1:153619040:T:Cacceptor_loss1.0000
1:153619051:C:CTacceptor_gain1.0000
1:153626316:CTAC:Cdonor_loss1.0000
1:153626318:A:Cdonor_loss1.0000
1:153626319:CCTT:Cdonor_loss1.0000
1:153626529:CTGAC:Cacceptor_gain1.0000
1:153626535:T:Gacceptor_loss1.0000
1:153628497:G:GGdonor_gain1.0000
1:153630659:GGAT:Gdonor_gain1.0000
1:153630660:G:GTdonor_gain1.0000
1:153630660:GAT:Gdonor_gain1.0000
1:153630663:G:GGdonor_gain1.0000
1:153619039:C:Tacceptor_gain0.9900
1:153619048:C:CTacceptor_gain0.9900
1:153619051:C:Tacceptor_gain0.9900
1:153619052:A:Tacceptor_gain0.9900
1:153626318:A:ACdonor_gain0.9900
1:153626319:C:CCdonor_gain0.9900
1:153626530:TGAC:Tacceptor_gain0.9900
1:153626531:GAC:Gacceptor_gain0.9900
1:153626533:CCTG:Cacceptor_gain0.9900
1:153626534:C:CCacceptor_gain0.9900

AlphaMissense

0 scored. Top likely-pathogenic:

dbSNP variants (sampled 300 via entrez): RS1000143162 (1:153620784 G>A,T), RS1000212278 (1:153619295 G>A), RS1000284570 (1:153620411 A>C), RS1000918441 (1:153622332 C>T), RS1001120163 (1:153632245 A>G), RS1001272366 (1:153620862 T>C), RS1001530344 (1:153632397 G>A), RS1001587220 (1:153632503 C>T), RS1001829229 (1:153625659 C>T), RS1001903315 (1:153632676 C>G,T), RS1002184205 (1:153632941 G>A,C), RS1002210709 (1:153636317 G>A), RS1002257869 (1:153632654 G>A), RS1002348892 (1:153627471 C>G), RS1002516231 (1:153634101 C>T)

Disease associations

OMIM: gene MIM:601989 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

1 associations (top):

StudyTraitp-value
GCST90002400_521Plateletcrit4.000000e-15

EFO canonical traits (1, from GWAS)

EFO IDTrait name
EFO:0007985platelet crit

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Benzo(a)pyreneaffects methylation, increases expression4
sodium arsenitedecreases expression, increases expression3
methylmercuric chloridedecreases expression2
Air Pollutantsdecreases expression, increases abundance2
Copperaffects binding, affects cotreatment, affects folding, affects secretion2
Doxorubicinaffects expression, increases expression2
Rotenonedecreases expression, increases expression2
Smokedecreases expression, increases abundance2
7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxidedecreases expression, increases expression2
Aflatoxin B1affects expression, increases methylation2
Particulate Matterdecreases expression, increases abundance2
aristolochic acid Iincreases expression1
FR900359increases phosphorylation1
dicrotophosdecreases expression1
bisphenol Aincreases expression1
pyrogallol 1,3-dimethyl etheraffects cotreatment, decreases expression, affects localization, increases expression1
beta-lapachoneincreases expression1
perfluorooctanoic acidincreases expression1
cuprous chlorideaffects binding, affects cotreatment, affects folding1
phenanthrenedecreases expression1
lewisiteincreases expression1
CGP 52608affects binding, increases reaction1
entinostatincreases expression1
K 7174increases expression1
fenpyroximateincreases expression1
pyrimidifenincreases expression1
nutlin 3affects cotreatment, increases secretion1
Grape Seed Proanthocyanidinsaffects cotreatment, decreases expression1
bisphenol AFincreases expression1
Decitabineaffects expression1

Cellosaurus cell lines

1 cell lines: 1 transformed cell line

First 10 cell lines (id-ordered, not curated):

CellosaurusNameCategorySex
CVCL_B3GFAbcam HEK293T S100A13 KOTransformed cell lineFemale

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.