RCC1L

gene
On this page

Summary

RCC1L (RCC1 like, HGNC:14948) is a protein-coding gene on chromosome 7q11.23, encoding RCC1-like G exchanging factor-like protein (Q96I51). Guanine nucleotide exchange factor (GEF) for mitochondrial dynamin-related GTPase OPA1. It is a selective cancer dependency (DepMap: 58.6% of cell lines).

This gene encodes a protein containing regulator of chromosome condensation 1-like repeats. The encoded protein may function as a guanine nucleotide exchange factor. This gene is located in a region of chromosome 7 that is deleted in Williams-Beuren syndrome, a multisystem developmental disorder. Alternative splicing results in multiple transcript variants.

Source: NCBI Gene 81554 — RefSeq curated summary.

At a glance

  • Clinical variants (ClinVar): 12 total
  • Cancer dependency (DepMap): dependent in 58.6% of screened cell lines
  • MANE Select transcript: NM_030798

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:14948
Approved symbolRCC1L
NameRCC1 like
Location7q11.23
Locus typegene with protein product
StatusApproved
Ensembl geneENSG00000274523
Ensembl biotypeprotein_coding
OMIM620739
Entrez81554

Gene structure

Transcript identifiers

Ensembl transcripts: 16 — 14 protein_coding, 2 retained_intron

ENST00000610322, ENST00000614461, ENST00000615250, ENST00000616051, ENST00000618035, ENST00000618102, ENST00000894006, ENST00000894007, ENST00000894008, ENST00000894009, ENST00000894010, ENST00000894011, ENST00000894012, ENST00000936501, ENST00000954050, ENST00000954051

RefSeq mRNA: 4 — MANE Select: NM_030798 NM_001281441, NM_001363447, NM_030798, NM_148842

CCDS: CCDS5577, CCDS64683, CCDS64684

Canonical transcript exons

ENST00000610322 — 11 exons

ExonStartEnd
ENSE000037191327506666475066792
ENSE000037199557505271175052796
ENSE000037244757505858875058769
ENSE000037276357507064075070769
ENSE000037346337504218375043109
ENSE000037393457505590175056074
ENSE000037422067506329275063343
ENSE000037469077507341475073802
ENSE000037479257506458275064648
ENSE000037523857506120775061291
ENSE000037545377505752975057616

Expression profiles

Bgee: expression breadth ubiquitous, 262 present calls, max score 94.64.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 19.1387 / max 233.7594, expressed in 1811 samples.

FANTOM5 promoters (2 alternative TSS)

Promoter IDTPM avgSamples expressed
8436818.18991810
843670.9487651

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
gastrocnemiusUBERON:000138894.64gold quality
hindlimb stylopod muscleUBERON:000425294.42gold quality
muscle of legUBERON:000138394.19gold quality
apex of heartUBERON:000209893.42gold quality
right adrenal gland cortexUBERON:003582793.25gold quality
right adrenal glandUBERON:000123393.24gold quality
left adrenal glandUBERON:000123492.75gold quality
right lobe of liverUBERON:000111492.31gold quality
left adrenal gland cortexUBERON:003582592.22gold quality
heart left ventricleUBERON:000208492.01gold quality
mucosa of transverse colonUBERON:000499192.01gold quality
cardiac ventricleUBERON:000208291.57gold quality
adrenal glandUBERON:000236991.55gold quality
right atrium auricular regionUBERON:000663191.49gold quality
muscle organUBERON:000163091.48gold quality
lower esophagus muscularis layerUBERON:003583391.43gold quality
lower esophagusUBERON:001347391.42gold quality
adrenal cortexUBERON:000123591.40gold quality
popliteal arteryUBERON:000225090.95gold quality
tibial arteryUBERON:000761090.93gold quality
stromal cell of endometriumCL:000225590.89gold quality
muscle layer of sigmoid colonUBERON:003580590.87gold quality
esophagogastric junction muscularis propriaUBERON:003584190.85gold quality
aortaUBERON:000094790.70gold quality
right coronary arteryUBERON:000162590.68gold quality
thoracic aortaUBERON:000151590.54gold quality
ascending aortaUBERON:000149690.50gold quality
adrenal tissueUBERON:001830390.31gold quality
descending thoracic aortaUBERON:000234590.22gold quality
heartUBERON:000094890.11gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3yes6.46

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

26 targeting RCC1L, 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-4283100.0066.422097
HSA-MIR-548AN99.9770.912817
HSA-MIR-551B-5P99.9671.283493
HSA-MIR-548AA99.9670.643753
HSA-MIR-548AP-3P99.9670.643753
HSA-MIR-548T-3P99.9670.643753
HSA-MIR-1236-3P99.9468.041695
HSA-MIR-548D-3P99.8770.674362
HSA-MIR-548BB-3P99.8670.584354
HSA-MIR-548AC99.8470.774351
HSA-MIR-548H-3P99.8470.804349
HSA-MIR-548Z99.8470.804349
HSA-MIR-6515-3P99.8268.191933
HSA-MIR-430799.8270.453374
HSA-MIR-430699.7270.503630
HSA-MIR-371499.7170.742671
HSA-MIR-466399.6265.33957
HSA-MIR-464499.3569.122514
HSA-MIR-185-5P99.3568.602497
HSA-MIR-1207-3P98.9966.221532
HSA-MIR-4755-3P98.7765.591915
HSA-MIR-1910-3P98.4467.511695
HSA-MIR-660-3P98.1466.041434
HSA-MIR-6511A-5P98.1367.471770
HSA-MIR-27B-5P97.3466.55549
HSA-MIR-4485-5P95.9159.69198

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 58.6% of screened cell lines.

Literature-anchored findings (GeneRIF, showing 2)

  • Using X-ray crystallography, established the structure of human Williams-Beuren Syndrome Chromosomal Region 16 (WBSCR16), and showed that WBSCR16 has seven-bladed b-propeller fold (the RCC1 fold) with unique surface features. (PMID:28608466)
  • RCC1L (WBSCR16) isoforms coordinate mitochondrial ribosome assembly through their interaction with GTPases. (PMID:32735630)

Cross-species orthologs

6 orthologs

OrganismSymbolGene ID
danio_reriorcc1lENSDARG00000059583
mus_musculusRcc1lENSMUSG00000061979
rattus_norvegicusRcc1lENSRNOG00000001483
drosophila_melanogasterCG3862FBGN0031286
drosophila_melanogasterCG33288FBGN0053288
caenorhabditis_elegansW09G3.7WBGENE00012370

Paralogs (9): ALS2 (ENSG00000003393), HERC1 (ENSG00000103657), SERGEF (ENSG00000129158), RCBTB1 (ENSG00000136144), RCBTB2 (ENSG00000136161), RPGR (ENSG00000156313), RCCD1 (ENSG00000166965), RCC2 (ENSG00000179051), RCC1 (ENSG00000180198)

Protein

Protein identifiers

RCC1-like G exchanging factor-like proteinQ96I51 (reviewed: Q96I51)

Alternative names: Williams-Beuren syndrome chromosomal region 16 protein

All UniProt accessions (2): Q96I51, A0A087WT38

UniProt curated annotations — full annotation on UniProt →

Function. Guanine nucleotide exchange factor (GEF) for mitochondrial dynamin-related GTPase OPA1. Activates OPA1, by exchanging bound GDP for free GTP, and drives OPA1 and MFN1-dependent mitochondrial fusion. Plays an essential role in mitochondrial ribosome biogenesis. As a component of a functional protein-RNA module, consisting of RCC1L, NGRN, RPUSD3, RPUSD4, TRUB2, FASTKD2 and 16S mitochondrial ribosomal RNA (16S mt-rRNA), controls 16S mt-rRNA abundance and is required for intra-mitochondrial translation of core subunits of the oxidative phosphorylation system. Plays an essential role in mitochondrial ribosome biogenesis via its association with GTPases that play a role in the assembly of the large ribosome subunit. Plays an essential role in mitochondrial ribosome biogenesis via its association with GTPases that play a role in the assembly of the small ribosome subunit.

Subunit / interactions. Forms a regulatory protein-RNA complex, consisting of RCC1L, NGRN, RPUSD3, RPUSD4, TRUB2, FASTKD2 and 16S mt-rRNA. Interacts with 16S mt-rRNA; this interaction is direct. Interacts with OPA1; this interaction is direct. Interacts with NME6; this interaction mediates activation of nucleoside diphosphate kinase activity. Associates with the mitochondrial ribosome large subunit (mt-LSU). Associates with the mitochondrial ribosome small subunit (mt-SSU).

Subcellular location. Mitochondrion membrane Mitochondrion inner membrane Mitochondrion inner membrane Mitochondrion inner membrane.

Tissue specificity. Ubiquitous.

Disease relevance. WBSCR16 is located in the Williams-Beuren syndrome (WBS) critical region. WBS results from a hemizygous deletion of several genes on chromosome 7q11.23, thought to arise as a consequence of unequal crossing over between highly homologous low-copy repeat sequences flanking the deleted region. Haploinsufficiency of WBSCR16 may be the cause of certain cardiovascular and musculo-skeletal abnormalities observed in the disease.

Domain organisation. The RCC1-like repeats assemble into a circular seven-bladed beta propeller structure. Each blade is composed of four antiparallel beta-strands with loops between each strand.

Isoforms (3)

UniProt IDNamesCanonical?
Q96I51-11, V1yes
Q96I51-22, V3
Q96I51-33, V2

RefSeq proteins (4): NP_001268370, NP_001350376, NP_110425, NP_683682 (=MANE)

Domains & families (InterPro)

IDNameType
IPR000408Reg_chr_condensRepeat
IPR009091RCC1/BLIP-IIHomologous_superfamily
IPR053035Mitochondrial_GEF_domainFamily
IPR058923RCC1-like_domDomain

Pfam: PF00415, PF25390

UniProt features (54 total): strand 33, repeat 7, turn 4, splice variant 3, helix 3, transit peptide 1, chain 1, sequence variant 1, mutagenesis site 1

Structure

Experimental structures (PDB)

1 structures.

PDBMethodResolution (Å)
5XGSX-RAY DIFFRACTION2

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q96I51-F189.790.80

Functional residue map

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

Mutagenesis-validated functional residues (1):

PositionPhenotype
1–37loss of mitochondrial localization.

Function

Pathways and Gene Ontology

Reactome pathways

2 pathways

IDPathway
R-HSA-6793080rRNA modification in the mitochondrion
R-HSA-9937008Mitochondrial mRNA modification

MSigDB gene sets: 147 (showing top): GOBP_RIBOSOME_BIOGENESIS, GGGNRMNNYCAT_UNKNOWN, GRAESSMANN_APOPTOSIS_BY_DOXORUBICIN_DN, GOBP_RIBOSOME_ASSEMBLY, YY1_Q6, MONNIER_POSTRADIATION_TUMOR_ESCAPE_UP, MCBRYAN_PUBERTAL_BREAST_4_5WK_DN, GOBP_RIBOSOMAL_LARGE_SUBUNIT_ASSEMBLY, BLALOCK_ALZHEIMERS_DISEASE_UP, GOBP_RIBOSOMAL_SMALL_SUBUNIT_BIOGENESIS, GOBP_PROTEIN_RNA_COMPLEX_ORGANIZATION, GOCC_MITOCHONDRIAL_ENVELOPE, GOBP_ORGANELLE_ASSEMBLY, MCBRYAN_PUBERTAL_BREAST_5_6WK_UP, GOBP_MITOCHONDRIAL_FUSION

GO Biological Process (3): mitochondrial fusion (GO:0008053), mitochondrial small ribosomal subunit assembly (GO:0180026), mitochondrial large ribosomal subunit assembly (GO:1902775)

GO Molecular Function (6): RNA binding (GO:0003723), guanyl-nucleotide exchange factor activity (GO:0005085), GTP binding (GO:0005525), rRNA binding (GO:0019843), nucleotide binding (GO:0000166), protein binding (GO:0005515)

GO Cellular Component (5): mitochondrion (GO:0005739), mitochondrial inner membrane (GO:0005743), mitochondrial matrix (GO:0005759), mitochondrial membrane (GO:0031966), membrane (GO:0016020)

Reactome top-level categories

Rollup of top-2 pathways:

CategoryPathways
rRNA processing in the mitochondrion1
Metabolism of RNA1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
mitochondrial ribosome assembly2
mitochondrion2
mitochondrion organization1
organelle fusion1
ribosomal small subunit assembly1
ribosomal large subunit assembly1
nucleic acid binding1
GTP binding1
GDP binding1
GTPase regulator activity1
guanyl ribonucleotide binding1
purine ribonucleoside triphosphate binding1
RNA binding1
nucleoside phosphate binding1
heterocyclic compound binding1
binding1
cytoplasm1
intracellular membrane-bounded organelle1
organelle inner membrane1
mitochondrial membrane1
intracellular organelle lumen1
mitochondrial envelope1
organelle membrane1
cellular anatomical structure1

Protein interactions and networks

STRING

1528 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
RCC1LNEK6Q9HC98830
RCC1LNGRNQ9NPE2779
RCC1LRPUSD4Q96CM3749
RCC1LRPGRIP1Q96KN7744
RCC1LRABIFP47224736
RCC1LRPUSD3Q6P087735
RCC1LPDE6DO43924722
RCC1LNEK7Q8TDX7715
RCC1LFASTKD2Q9NYY8698
RCC1LRANP17080683
RCC1LNEK1Q96PY6659
RCC1LRAB40ALP0C0E4647
RCC1LIQCB1Q15051641
RCC1LUBE3AP78355632
RCC1LNEK3P51956629

IntAct

87 interactions, top by confidence:

ABTypeScore
RCC1LNME6psi-mi:“MI:0914”(association)0.720
RCC1LNME6psi-mi:“MI:0915”(physical association)0.720
NME6RCC1Lpsi-mi:“MI:0915”(physical association)0.720
GOLPH3RCC1Lpsi-mi:“MI:0914”(association)0.640
ETFRF1NDUFAB1psi-mi:“MI:0914”(association)0.640
LIN28AIGF2BP3psi-mi:“MI:0914”(association)0.640
FAM120ASYNCRIPpsi-mi:“MI:0914”(association)0.640
YWHAGRCC1Lpsi-mi:“MI:0915”(physical association)0.560
SETDB1RCC1Lpsi-mi:“MI:0915”(physical association)0.560
KAT5RCC1Lpsi-mi:“MI:0915”(physical association)0.560
LMO3RCC1Lpsi-mi:“MI:0915”(physical association)0.560
IGF2BP3PTCD1psi-mi:“MI:0914”(association)0.530
DHHHSPA5psi-mi:“MI:0914”(association)0.530
MRPL13GTPBP10psi-mi:“MI:0914”(association)0.530
MRPL2GTPBP10psi-mi:“MI:0914”(association)0.530
ILF2IGF2BP3psi-mi:“MI:0914”(association)0.530

BioGRID (134): WBSCR16 (Affinity Capture-MS), MRPL45 (Co-fractionation), WBSCR16 (Affinity Capture-MS), WBSCR16 (Affinity Capture-MS), WBSCR16 (Affinity Capture-MS), TRUB2 (Affinity Capture-MS), C6orf203 (Affinity Capture-MS), NME6 (Affinity Capture-MS), WBSCR16 (Affinity Capture-MS), NRD1 (Affinity Capture-MS), DHRS4 (Affinity Capture-MS), PMPCB (Affinity Capture-MS), PMPCA (Affinity Capture-MS), STARD7 (Affinity Capture-MS), NUDT19 (Affinity Capture-MS)

ESM2 similar proteins: A1L3K1, A2AFS3, A5PKD9, A6QQ60, A8MYP8, B5DFI8, B5DFK7, G3MWR8, O35217, O73884, P07992, P0C7P0, P28686, P42642, P48801, Q01134, Q08DW9, Q2HJ19, Q3SZB3, Q4R766, Q5EA46, Q5M8M2, Q5R890, Q5TH74, Q5XIJ5, Q5ZIN0, Q5ZJB7, Q63750, Q67FW5, Q6DD70, Q6GL10, Q6GV29, Q6PCB6, Q6UXG2, Q7RTP6, Q7Z6J6, Q86XW9, Q8CJ19, Q8N2K0, Q8N5X7

Diamond homologs: A1L4W5, F1RD40, F2Z461, O74881, O75592, O94955, O95199, O95714, P0C5Y8, P28745, P31386, Q13105, Q15034, Q15751, Q3MHW0, Q4U2R1, Q52KW8, Q54HT1, Q54VW7, Q5BIW4, Q5DX34, Q5RCZ7, Q5SVQ8, Q6NXM2, Q6NYE2, Q6P798, Q6ZPR6, Q7TPH6, Q80YD6, Q811F1, Q8BK67, Q8IVU3, Q8NDN9, Q920R0, Q92834, Q96I51, Q96Q42, Q99LJ7, Q9CTN4, Q9CYF5

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 76 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
Mitochondrial ribosome-associated quality control1124.1×2e-10
Mitochondrial translation initiation1022.7×1e-09
Mitochondrial translation elongation1022.7×1e-09
Mitochondrial translation819.7×3e-07
Mitochondrial translation termination1019.6×4e-09
Translation910.0×1e-05
mRNA Splicing59.8×4e-03
Processing of Capped Intron-Containing Pre-mRNA68.8×2e-03

GO biological processes:

GO termPartnersFoldFDR
mitochondrial translation1126.5×1e-10
RNA processing515.2×1e-03
translation710.0×8e-04
RNA splicing78.6×1e-03
mRNA processing77.7×2e-03
mRNA splicing, via spliceosome67.6×5e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance6
Likely benign0
Benign1

Top pathogenic / likely-pathogenic (0)

SpliceAI

1646 predictions. Top by Δscore:

VariantEffectΔscore
7:75052709:AC:Adonor_gain1.0000
7:75052710:CC:Cdonor_gain1.0000
7:75052797:C:CCacceptor_gain1.0000
7:75055899:A:ACdonor_gain1.0000
7:75055900:C:CTdonor_gain1.0000
7:75055900:CTGGT:Cdonor_gain1.0000
7:75058586:A:ATdonor_loss1.0000
7:75058587:CCT:Cdonor_loss1.0000
7:75058765:CAGAC:Cacceptor_gain1.0000
7:75058766:AGAC:Aacceptor_gain1.0000
7:75058768:ACCTA:Aacceptor_loss1.0000
7:75058771:T:Aacceptor_loss1.0000
7:75058774:CACAG:Cacceptor_gain1.0000
7:75058776:C:CTacceptor_gain1.0000
7:75058777:A:Tacceptor_gain1.0000
7:75058778:G:Cacceptor_gain1.0000
7:75058778:G:GCacceptor_gain1.0000
7:75063361:T:Cacceptor_gain1.0000
7:75063361:T:TCacceptor_gain1.0000
7:75064649:C:CCacceptor_gain1.0000
7:75066662:ACCT:Adonor_gain1.0000
7:75066663:CCTC:Cdonor_gain1.0000
7:75066789:CTCG:Cacceptor_gain1.0000
7:75066791:CG:Cacceptor_gain1.0000
7:75066793:C:CCacceptor_gain1.0000
7:75070634:GCTCA:Gdonor_loss1.0000
7:75070635:CTCAC:Cdonor_loss1.0000
7:75070636:TCA:Tdonor_loss1.0000
7:75070637:CA:Cdonor_loss1.0000
7:75070638:A:ACdonor_gain1.0000

AlphaMissense

2958 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
7:75061268:A:CS242R1.000
7:75061268:A:TS242R1.000
7:75061270:T:GS242R1.000
7:75052748:C:TG427E0.999
7:75052776:A:GW418R0.999
7:75052776:A:TW418R0.999
7:75056054:A:GW360R0.999
7:75056054:A:TW360R0.999
7:75058634:C:TG308E0.999
7:75058638:A:GW307R0.999
7:75058638:A:TW307R0.999
7:75070740:G:CF118L0.999
7:75070740:G:TF118L0.999
7:75070742:A:GF118L0.999
7:75052718:G:TP437Q0.998
7:75052749:C:GG427R0.998
7:75052749:C:TG427R0.998
7:75052772:C:AG419V0.998
7:75052773:C:GG419R0.998
7:75056035:C:TG366E0.998
7:75058629:A:GS310P0.998
7:75058634:C:AG308V0.998
7:75058635:C:GG308R0.998
7:75058635:C:TG308R0.998
7:75058679:T:AD293V0.998
7:75061211:T:AQ261H0.998
7:75061211:T:GQ261H0.998
7:75061230:C:TG255E0.998
7:75064629:A:CN201K0.998
7:75064629:A:TN201K0.998

dbSNP variants (sampled 300 via entrez): RS1000023208 (7:75051825 C>T), RS1000088023 (7:75060638 C>A), RS1000176824 (7:75057407 G>A,T), RS1000252114 (7:75057538 C>A), RS1000431179 (7:75063685 G>A), RS1000438190 (7:75051461 G>C), RS1000646905 (7:75056391 C>A,G,T), RS1000676421 (7:75067594 C>A,T), RS1000693600 (7:75062160 T>A,G), RS1000865612 (7:75063480 A>G,T), RS1000876203 (7:75067327 G>A), RS1000897169 (7:75036368 C>T), RS1000907326 (7:75067099 C>T), RS1000978023 (7:75030062 C>G), RS1001103593 (7:75072787 G>C)

Disease associations

OMIM: gene MIM:620739 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

0 associations (top):

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

28 total (human), top 28 by PubMed support.

ChemicalActions (top 5)PubMed papers
sodium arseniteaffects cotreatment, decreases expression, increases abundance, increases expression4
aristolochic acid Iincreases expression1
trichostatin Aaffects expression1
beta-lapachonedecreases expression1
di-n-butylphosphoric acidaffects expression1
AM 251decreases expression1
monomethylarsonous aciddecreases expression1
K 7174decreases expression1
Air Pollutantsaffects expression, increases abundance1
Amiodaroneincreases expression1
Arsenicdecreases expression, increases abundance1
Benzo(a)pyrenedecreases expression1
Demecolcineincreases expression1
Diethylhexyl Phthalatedecreases expression, increases expression1
Hydrogen Peroxideaffects cotreatment, decreases expression1
Leaddecreases expression1
Ozoneaffects expression, increases abundance1
Ribonucleotidesaffects binding1
Smokedecreases expression1
Theophyllineaffects cotreatment, decreases expression1
Thiramdecreases expression1
Tretinoinaffects cotreatment, decreases expression1
Vincristineincreases expression1
7,8-Dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxidedecreases expression1
Aflatoxin B1increases methylation1
Palmitic Acidincreases expression1
Copper Sulfatedecreases expression1
Lactic Aciddecreases 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.