ANAPC13

gene
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Also known as SWM1APC13DKFZP566D193

Summary

ANAPC13 (anaphase promoting complex subunit 13, HGNC:24540) is a protein-coding gene on chromosome 3q22.2, encoding Anaphase-promoting complex subunit 13 (Q9BS18). Component of the anaphase promoting complex/cyclosome (APC/C), a cell cycle-regulated E3 ubiquitin ligase that controls progression through mitosis and the G1 phase of the cell cycle. It is a selective cancer dependency (DepMap: 65.5% of cell lines).

This gene encodes a component of the anaphase promoting complex, a large ubiquitin-protein ligase that controls cell cycle progression by regulating the degradation of cell cycle regulators such as B-type cyclins. The encoded protein is evolutionarily conserved and is required for the integrity and ubiquitin ligase activity of the anaphase promoting complex. Pseudogenes and splice variants have been found for this gene; however, the biological validity of some of the splice variants has not been determined.

Source: NCBI Gene 25847 — RefSeq curated summary.

At a glance

  • GWAS associations: 24
  • Clinical variants (ClinVar): 17 total — 2 pathogenic
  • Cancer dependency (DepMap): dependent in 65.5% of screened cell lines
  • MANE Select transcript: NM_015391

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:24540
Approved symbolANAPC13
Nameanaphase promoting complex subunit 13
Location3q22.2
Locus typegene with protein product
StatusApproved
AliasesSWM1, APC13, DKFZP566D193
Ensembl geneENSG00000129055
Ensembl biotypeprotein_coding
OMIM614484
Entrez25847

Gene structure

Transcript identifiers

Ensembl transcripts: 20 — 18 protein_coding, 2 retained_intron

ENST00000354910, ENST00000503439, ENST00000508755, ENST00000510994, ENST00000511751, ENST00000514612, ENST00000891857, ENST00000891858, ENST00000891859, ENST00000891860, ENST00000891861, ENST00000891862, ENST00000891863, ENST00000891864, ENST00000891865, ENST00000924686, ENST00000924687, ENST00000924688, ENST00000961476, ENST00000961477

RefSeq mRNA: 3 — MANE Select: NM_015391 NM_001242374, NM_001242375, NM_015391

CCDS: CCDS3085

Canonical transcript exons

ENST00000354910 — 3 exons

ExonStartEnd
ENSE00000885901134482806134482931
ENSE00001413445134485952134485985
ENSE00002078678134477706134478715

Expression profiles

Bgee: expression breadth ubiquitous, 295 present calls, max score 98.72.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 34.0085 / max 775.5929, expressed in 1813 samples.

FANTOM5 promoters (5 alternative TSS)

Promoter IDTPM avgSamples expressed
4470726.54001806
447064.80231632
447042.12211083
447050.3713151
447030.172860

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
nephron tubuleUBERON:000123198.72gold quality
parotid glandUBERON:000183198.52gold quality
pigmented layer of retinaUBERON:000178298.50gold quality
corpus epididymisUBERON:000435998.43gold quality
palpebral conjunctivaUBERON:000181298.10gold quality
kidney epitheliumUBERON:000481998.05gold quality
heart right ventricleUBERON:000208098.01gold quality
renal glomerulusUBERON:000007497.98gold quality
caput epididymisUBERON:000435897.96gold quality
metanephric glomerulusUBERON:000473697.84gold quality
cauda epididymisUBERON:000436097.76gold quality
renal medullaUBERON:000036297.72gold quality
myocardiumUBERON:000234997.69gold quality
left ventricle myocardiumUBERON:000656697.39gold quality
germinal epithelium of ovaryUBERON:000130497.38gold quality
metanephrosUBERON:000008197.37gold quality
islet of LangerhansUBERON:000000697.28gold quality
hypothalamusUBERON:000189897.24gold quality
upper leg skinUBERON:000426297.16gold quality
choroid plexus epitheliumUBERON:000391197.15gold quality
visceral pleuraUBERON:000240197.10gold quality
cortex of kidneyUBERON:000122597.09gold quality
parietal pleuraUBERON:000240097.09gold quality
pleuraUBERON:000097797.07gold quality
bronchial epithelial cellCL:000232897.06gold quality
skin of hipUBERON:000155497.03gold quality
adult mammalian kidneyUBERON:000008297.00gold quality
kidneyUBERON:000211396.94gold quality
epithelium of bronchusUBERON:000203196.87gold quality
middle temporal gyrusUBERON:000277196.85gold quality

Single-cell (SCXA)

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

ExperimentMarker?Max mean expression
E-ANND-3no0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

59 targeting ANAPC13, 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-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-512-3P99.9767.351049
HSA-MIR-4725-3P99.9669.532520
HSA-MIR-6780B-5P99.9669.602562
HSA-MIR-6772-5P99.9467.01577
HSA-MIR-539-5P99.9370.302855
HSA-MIR-10527-5P99.9172.283754
HSA-MIR-130599.9171.433443
HSA-MIR-806399.9169.763146
HSA-MIR-367199.9073.043897
HSA-MIR-427199.8868.322244
HSA-MIR-1255A99.7468.09744
HSA-MIR-1255B-5P99.7468.16741
HSA-MIR-442899.7366.411733
HSA-MIR-430699.7270.503630
HSA-MIR-1296-3P99.7264.04636
HSA-MIR-6892-3P99.6866.401178
HSA-MIR-6758-3P99.5767.551078
HSA-MIR-510-3P99.5470.062965
HSA-MIR-5571-5P99.4966.991764
HSA-MIR-432599.4972.201342
HSA-MIR-1213199.4868.721673
HSA-MIR-1213299.4768.901341
HSA-MIR-425199.4069.193363
HSA-MIR-4797-5P99.3968.011354
HSA-MIR-103A-1-5P99.3967.781545
HSA-MIR-103A-2-5P99.3967.721577

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 65.5% of screened cell lines.

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
danio_rerioanapc13ENSDARG00000078435
mus_musculusAnapc13ENSMUSG00000035048
rattus_norvegicusAnapc13ENSRNOG00000008459

Protein

Protein identifiers

Anaphase-promoting complex subunit 13Q9BS18 (reviewed: Q9BS18)

Alternative names: Cyclosome subunit 13

All UniProt accessions (2): Q9BS18, A8K3Z6

UniProt curated annotations — full annotation on UniProt →

Function. Component of the anaphase promoting complex/cyclosome (APC/C), a cell cycle-regulated E3 ubiquitin ligase that controls progression through mitosis and the G1 phase of the cell cycle. The APC/C complex acts by mediating ubiquitination and subsequent degradation of target proteins: it mainly mediates the formation of ‘Lys-11’-linked polyubiquitin chains and, to a lower extent, the formation of ‘Lys-48’- and ‘Lys-63’-linked polyubiquitin chains. The APC/C complex catalyzes assembly of branched ‘Lys-11’-/‘Lys-48’-linked branched ubiquitin chains on target proteins.

Subunit / interactions. The mammalian APC/C is composed at least of 14 distinct subunits ANAPC1, ANAPC2, CDC27/APC3, ANAPC4, ANAPC5, CDC16/APC6, ANAPC7, CDC23/APC8, ANAPC10, ANAPC11, CDC26/APC12, ANAPC13, ANAPC15 and ANAPC16 that assemble into a complex of at least 19 chains with a combined molecular mass of around 1.2 MDa; APC/C interacts with FZR1 and FBXO5.

Subcellular location. Nucleus.

Pathway. Protein modification; protein ubiquitination.

Similarity. Belongs to the APC13 family.

RefSeq proteins (3): NP_001229303, NP_001229304, NP_056206* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR008401Apc13Family

Pfam: PF05839

UniProt features (9 total): helix 4, sequence conflict 2, chain 1, region of interest 1, strand 1

Structure

Experimental structures (PDB)

20 structures.

PDBMethodResolution (Å)
9GAWELECTRON MICROSCOPY2.9
6Q6GELECTRON MICROSCOPY3.2
6Q6HELECTRON MICROSCOPY3.2
8PKPELECTRON MICROSCOPY3.2
5G05ELECTRON MICROSCOPY3.4
8TAUELECTRON MICROSCOPY3.5
4UI9ELECTRON MICROSCOPY3.6
6TNTELECTRON MICROSCOPY3.78
6TLJELECTRON MICROSCOPY3.8
5G04ELECTRON MICROSCOPY3.9
6TM5ELECTRON MICROSCOPY3.9
9N9RELECTRON MICROSCOPY3.9
9N9SELECTRON MICROSCOPY3.9
8TARELECTRON MICROSCOPY4
5LCWELECTRON MICROSCOPY4.2
5A31ELECTRON MICROSCOPY4.3
5KHUELECTRON MICROSCOPY4.8
5KHRELECTRON MICROSCOPY6.1
5L9TELECTRON MICROSCOPY6.4
5L9UELECTRON MICROSCOPY6.4

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9BS18-F174.060.13

Function

Pathways and Gene Ontology

Reactome pathways

4 pathways

IDPathway
R-HSA-983168Antigen processing: Ubiquitination & Proteasome degradation
R-HSA-1280218Adaptive Immune System
R-HSA-168256Immune System
R-HSA-983169Class I MHC mediated antigen processing & presentation

MSigDB gene sets: 169 (showing top): BUYTAERT_PHOTODYNAMIC_THERAPY_STRESS_DN, REACTOME_ADAPTIVE_IMMUNE_SYSTEM, REACTOME_CLASS_I_MHC_MEDIATED_ANTIGEN_PROCESSING_PRESENTATION, REACTOME_ANTIGEN_PROCESSING_UBIQUITINATION_PROTEASOME_DEGRADATION, GOBP_ANAPHASE_PROMOTING_COMPLEX_DEPENDENT_CATABOLIC_PROCESS, GOBP_MACROMOLECULE_CATABOLIC_PROCESS, GOBP_REGULATION_OF_MEIOTIC_CELL_CYCLE, GOBP_PROTEIN_K11_LINKED_UBIQUITINATION, GOBP_REGULATION_OF_CELL_CYCLE, MORF_PPP6C, GOBP_REGULATION_OF_REPRODUCTIVE_PROCESS, YAO_TEMPORAL_RESPONSE_TO_PROGESTERONE_CLUSTER_13, GOBP_POST_TRANSLATIONAL_PROTEIN_MODIFICATION, GOBP_PROTEIN_POLYUBIQUITINATION, GOBP_MITOTIC_CELL_CYCLE

GO Biological Process (8): regulation of mitotic cell cycle (GO:0007346), anaphase-promoting complex-dependent catabolic process (GO:0031145), cell division (GO:0051301), regulation of meiotic cell cycle (GO:0051445), protein K48-linked ubiquitination (GO:0070936), protein K11-linked ubiquitination (GO:0070979), protein branched polyubiquitination (GO:0141198), protein ubiquitination (GO:0016567)

GO Molecular Function (1): protein binding (GO:0005515)

GO Cellular Component (2): anaphase-promoting complex (GO:0005680), nucleus (GO:0005634)

Reactome top-level categories

Rollup of top-3 pathways:

CategoryPathways
Class I MHC mediated antigen processing & presentation1
Immune System1
Adaptive Immune System1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
protein polyubiquitination3
regulation of cell cycle2
mitotic cell cycle1
proteasome-mediated ubiquitin-dependent protein catabolic process1
cellular process1
meiotic cell cycle1
regulation of reproductive process1
protein modification by small protein conjugation1
binding1
nuclear ubiquitin ligase complex1
cullin-RING ubiquitin ligase complex1
intracellular membrane-bounded organelle1

Protein interactions and networks

STRING

964 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
ANAPC13CDC26Q8NHZ8965
ANAPC13ANAPC10Q9UM13963
ANAPC13ANAPC16Q96DE5944
ANAPC13CDC23Q9UJX2925
ANAPC13ANAPC11Q9NYG5877
ANAPC13ANAPC15P60006867
ANAPC13ANAPC5Q9UJX4855
ANAPC13CDC16Q13042843
ANAPC13CDC27P30260794
ANAPC13CDC20Q12834671
ANAPC13OR2B3O76000507
ANAPC13SLC35F4A4IF30474
ANAPC13CDK2P24941468
ANAPC13ANAPC4Q9UJX5457
ANAPC13FZR1Q9UM11452

IntAct

54 interactions, top by confidence:

ABTypeScore
CDC20BUB1Bpsi-mi:“MI:0914”(association)0.980
ANAPC2CDC27psi-mi:“MI:0915”(physical association)0.910
ANAPC13CDC23psi-mi:“MI:0915”(physical association)0.880
ANAPC4CDC27psi-mi:“MI:0914”(association)0.860
ANAPC5CDC27psi-mi:“MI:0914”(association)0.810
CDC16BUB1Bpsi-mi:“MI:0914”(association)0.790
CDC23BUB1Bpsi-mi:“MI:0914”(association)0.790
ANAPC16BUB1Bpsi-mi:“MI:0914”(association)0.730
ANAPC2BUB1Bpsi-mi:“MI:0914”(association)0.730
ANAPC13CDC27psi-mi:“MI:0914”(association)0.640
CDC26BUB1Bpsi-mi:“MI:0914”(association)0.640
C16orf87CDC27psi-mi:“MI:0914”(association)0.640
Cdc20BUB1psi-mi:“MI:0914”(association)0.560
Cdc20BUB1psi-mi:“MI:0915”(physical association)0.560
Cdc23BUB1Bpsi-mi:“MI:0915”(physical association)0.560
Cdc16BUB1Bpsi-mi:“MI:0915”(physical association)0.560
Cdc26BUB1Bpsi-mi:“MI:0915”(physical association)0.560
ANAPC13WFS1psi-mi:“MI:0915”(physical association)0.560

BioGRID (133): ANAPC13 (Two-hybrid), ANAPC13 (Affinity Capture-RNA), ANAPC13 (Affinity Capture-RNA), ANAPC13 (Co-purification), ANAPC13 (Affinity Capture-Western), ANAPC13 (Co-fractionation), TAF4 (Co-fractionation), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS), ANAPC13 (Affinity Capture-MS)

ESM2 similar proteins: A0A023IWK5, A2BT05, A2BYF5, A2C4H7, A5PJU8, A8W7N1, K4JY29, O64242, P02677, P03715, P04564, P06885, P07543, P09692, P0C2K6, P0DJH2, P0DTH7, P11967, P31182, P33713, P43511, P52820, P68116, P68117, P68249, P80504, P80529, P83767, P85087, P85112, P85211, P85509, P85512, P85800, P86043, P86929, Q2NKV2, Q32PD7, Q3U898, Q46J74

Diamond homologs: Q28IW8, Q2NKV2, Q5RBV4, Q8R034, Q9BS18

SIGNOR signaling

1 interactions.

AEffectBMechanism
ANAPC13“form complex”APC-cbinding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 29 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
Inhibition of the proteolytic activity of APC/C required for the onset of anaphase by mitotic spindle checkpoint components13434.1×2e-33
Inactivation of APC/C via direct inhibition of the APC/C complex13355.2×7e-32
Conversion from APC/C:Cdc20 to APC/C:Cdh1 in late anaphase11300.5×3e-26
APC-Cdc20 mediated degradation of Nek2A13289.4×1e-30
APC:Cdc20 mediated degradation of cell cycle proteins prior to satisfation of the cell cycle checkpoint13289.4×1e-30
Phosphorylation of the APC/C10286.2×2e-23
Activation of APC/C and APC/C:Cdc20 mediated degradation of mitotic proteins13279.1×2e-30
Aberrant regulation of mitotic exit in cancer due to RB1 defects10273.2×3e-23

GO biological processes:

GO termPartnersFoldFDR
regulation of meiotic cell cycle11421.3×2e-26
protein branched polyubiquitination10421.3×2e-24
anaphase-promoting complex-dependent catabolic process11386.2×3e-26
protein K11-linked ubiquitination10195.9×1e-20
mitotic spindle assembly checkpoint signaling5140.4×2e-09
regulation of mitotic cell cycle11132.4×1e-20
protein K48-linked ubiquitination1084.3×9e-17
cell division1534.6×2e-20

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic2
Likely pathogenic0
Uncertain significance10
Likely benign0
Benign0

Top pathogenic / likely-pathogenic (2)

Variant IDHGVSClassification
1708468GRCh37/hg19 3q22.2(chr3:133998370-134678040)x1Pathogenic
4279117GRCh37/hg19 3q22.2(chr3:134113279-134337513)x1Pathogenic

SpliceAI

630 predictions. Top by Δscore:

VariantEffectΔscore
3:134478712:CATT:Cacceptor_gain1.0000
3:134478714:TT:Tacceptor_gain1.0000
3:134482822:T:TAdonor_gain1.0000
3:134485100:T:TAdonor_gain1.0000
3:134478711:TCATT:Tacceptor_gain0.9900
3:134478712:CATTC:Cacceptor_gain0.9900
3:134478714:TTCTG:Tacceptor_loss0.9900
3:134478715:TCTGA:Tacceptor_loss0.9900
3:134478716:C:CCacceptor_gain0.9900
3:134478717:T:Aacceptor_loss0.9900
3:134482801:CCT:Cdonor_loss0.9900
3:134482802:CTA:Cdonor_loss0.9900
3:134482804:A:ACdonor_gain0.9900
3:134482804:ACC:Adonor_loss0.9900
3:134482805:C:CCdonor_gain0.9900
3:134482927:CAAAT:Cacceptor_gain0.9900
3:134482928:AAATC:Aacceptor_loss0.9900
3:134482930:ATC:Aacceptor_loss0.9900
3:134482932:C:CCacceptor_gain0.9900
3:134482933:T:Gacceptor_loss0.9900
3:134478713:ATT:Aacceptor_gain0.9700
3:134482928:AAAT:Aacceptor_gain0.9600
3:134482934:G:Cacceptor_loss0.9600
3:134485072:C:CAdonor_gain0.9600
3:134485659:T:Adonor_gain0.9600
3:134485731:T:TAdonor_gain0.9600
3:134478724:G:Cacceptor_gain0.9500
3:134478718:G:Cacceptor_loss0.9400
3:134482805:CCA:Cdonor_gain0.9400
3:134482929:AAT:Aacceptor_gain0.9400

AlphaMissense

0 scored. Top likely-pathogenic:

dbSNP variants (sampled 300 via entrez): RS1000813621 (3:134483449 AG>A), RS1000849571 (3:134478736 T>A), RS1001369834 (3:134485301 A>G), RS1002333677 (3:134482892 C>A), RS1002660373 (3:134485998 C>A,T), RS1002707571 (3:134485844 C>A), RS1003526390 (3:134486225 G>A,C,T), RS1003606310 (3:134481395 C>T), RS1003765302 (3:134486391 CG>C), RS1003861050 (3:134482512 A>G), RS1003939031 (3:134481722 T>G), RS1004237989 (3:134486681 T>A,G), RS1004369669 (3:134480987 T>G), RS1004381127 (3:134480624 T>C), RS1004696123 (3:134486473 A>G)

Disease associations

OMIM: gene MIM:614484 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

24 associations (top):

StudyTraitp-value
GCST000174_11Height7.000000e-08
GCST004063_33Waist circumference adjusted for body mass index8.000000e-07
GCST004063_38Waist circumference adjusted for body mass index2.000000e-11
GCST004063_42Waist circumference adjusted for body mass index1.000000e-06
GCST004407_3Neurocognitive impairment in HIV-1 infection (dichotomous)2.000000e-06
GCST004500_102Waist circumference adjusted for BMI (adjusted for smoking behaviour)1.000000e-12
GCST004500_13Waist circumference adjusted for BMI (adjusted for smoking behaviour)2.000000e-08
GCST004500_51Waist circumference adjusted for BMI (adjusted for smoking behaviour)6.000000e-07
GCST004501_26Waist circumference adjusted for BMI (joint analysis main effects and smoking interaction)8.000000e-07
GCST004501_7Waist circumference adjusted for BMI (joint analysis main effects and smoking interaction)7.000000e-13
GCST004501_8Waist circumference adjusted for BMI (joint analysis main effects and smoking interaction)4.000000e-07
GCST004504_4Waist circumference adjusted for BMI in non-smokers9.000000e-07
GCST004504_5Waist circumference adjusted for BMI in non-smokers2.000000e-12
GCST004504_6Waist circumference adjusted for BMI in non-smokers2.000000e-07
GCST004562_177Waist circumference adjusted for body mass index9.000000e-09
GCST004562_75Waist circumference adjusted for body mass index4.000000e-06
GCST004562_91Waist circumference adjusted for body mass index1.000000e-09
GCST004563_227Waist circumference adjusted for BMI (joint analysis main effects and physical activity interaction)2.000000e-08
GCST004563_68Waist circumference adjusted for BMI (joint analysis main effects and physical activity interaction)2.000000e-09
GCST004563_82Waist circumference adjusted for BMI (joint analysis main effects and physical activity interaction)5.000000e-06
GCST004564_123Waist circumference adjusted for BMI in active individuals4.000000e-09
GCST004564_124Waist circumference adjusted for BMI in active individuals2.000000e-06
GCST004564_125Waist circumference adjusted for BMI in active individuals4.000000e-10
GCST008839_555Height9.000000e-19

EFO canonical traits (4, from GWAS)

EFO IDTrait name
EFO:0007789BMI-adjusted waist circumference
EFO:0007998cognitive impairment measurement
EFO:0004318smoking behavior
EFO:0008002physical activity measurement

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

22 total (human), top 22 by PubMed support.

ChemicalActions (top 5)PubMed papers
Air Pollutantsaffects expression, increases abundance, decreases expression2
aristolochic acid Iincreases expression1
dicrotophosdecreases expression1
beauvericinaffects cotreatment, decreases expression1
triphenyl phosphateaffects expression1
bisphenol Aaffects expression1
trichostatin Aaffects expression1
sodium arsenitedecreases expression1
1-aminomethylphosphonic acidincreases expression1
CGP 52608increases reaction, affects binding1
enniatinsaffects cotreatment, decreases expression1
Glyphosatedecreases expression1
Chelating Agentsaffects binding, decreases expression1
Copperaffects binding, decreases expression1
Doxorubicindecreases expression1
Formaldehydedecreases expression1
Ozoneaffects expression, increases abundance1
Valproic Acidaffects expression1
Aflatoxin M1decreases expression1
Monocrotalineincreases expression, increases metabolic processing1
Okadaic Aciddecreases expression1
Particulate Matterdecreases expression, increases 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.