IL26

gene
On this page

Also known as AK155IL-26

Summary

IL26 (interleukin 26, HGNC:17119) is a protein-coding gene on chromosome 12q15, encoding Interleukin-26 (Q9NPH9). May play a role in local mechanisms of mucosal immunity and seems to have a pro-inflammatory function.

This gene was identified by its overexpression specifically in herpesvirus samimiri-transformed T cells. The encoded protein is a member of the IL10 family of cytokines. It is a secreted protein and may function as a homodimer. This protein is thought to contribute to the transformed phenotype of T cells after infection by herpesvirus samimiri.

Source: NCBI Gene 55801 — RefSeq curated summary.

At a glance

  • GWAS associations: 6
  • Clinical variants (ClinVar): 32 total
  • MANE Select transcript: NM_018402

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:17119
Approved symbolIL26
Nameinterleukin 26
Location12q15
Locus typegene with protein product
StatusApproved
AliasesAK155, IL-26
Ensembl geneENSG00000111536
Ensembl biotypeprotein_coding
OMIM605679
Entrez55801

Gene structure

Transcript identifiers

Ensembl transcripts: 1 — 1 protein_coding

ENST00000229134

RefSeq mRNA: 1 — MANE Select: NM_018402 NM_018402

CCDS: CCDS8981

Canonical transcript exons

ENST00000229134 — 5 exons

ExonStartEnd
ENSE000007516956822558668225810
ENSE000007516966822544468225500
ENSE000007516976822514968225283
ENSE000007516986820201868202083
ENSE000007516996820134968201931

Expression profiles

Bgee: expression breadth broad, 44 present calls, max score 56.74.

FANTOM5 (CAGE): breadth tissue_specific, TPM avg 0.2045 / max 55.8177, expressed in 41 samples.

FANTOM5 promoters (5 alternative TSS)

Promoter IDTPM avgSamples expressed
1319640.105525
1319650.055319
1319630.034112
1319620.00572
1319610.00402

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
vermiform appendixUBERON:000115456.74gold quality
deciduaUBERON:000245056.55gold quality
lower lobe of lungUBERON:000894955.91silver quality
caecumUBERON:000115354.36gold quality
hair follicleUBERON:000207352.93gold quality
amniotic fluidUBERON:000017352.15silver quality
bone marrow cellCL:000209251.40gold quality
mucosa of transverse colonUBERON:000499151.31gold quality
granulocyteCL:000009451.29silver quality
Brodmann (1909) area 46UBERON:000648349.30gold quality
blood vessel layerUBERON:000479749.29gold quality
cervix squamous epitheliumUBERON:000692249.20gold quality
olfactory bulbUBERON:000226448.92gold quality
choroid plexus epitheliumUBERON:000391148.89gold quality
myocardiumUBERON:000234948.87gold quality
type B pancreatic cellCL:000016948.83gold quality
cardiac muscle of right atriumUBERON:000337948.55gold quality
CA1 field of hippocampusUBERON:000388148.50gold quality
quadriceps femorisUBERON:000137748.47gold quality
oviduct epitheliumUBERON:000480448.46gold quality
vastus lateralisUBERON:000137948.25gold quality
left ventricle myocardiumUBERON:000656648.24gold quality
orbitofrontal cortexUBERON:000416748.20gold quality
upper arm skinUBERON:000426348.06gold quality
cervix epitheliumUBERON:000480148.04gold quality
tongue squamous epitheliumUBERON:000691947.92gold quality
mucosa of urinary bladderUBERON:000125947.80gold quality
nasal cavity epitheliumUBERON:000538447.70gold quality
epithelial cell of pancreasCL:000008347.50gold quality
thymusUBERON:000237047.42gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 0.

ExperimentMarker?Max mean expression
E-ANND-3no1.76

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

30 targeting IL26, 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-4668-3P100.0068.742635
HSA-MIR-19A-3P99.9875.332762
HSA-MIR-19B-3P99.9875.442754
HSA-MIR-1213699.9872.815713
HSA-MIR-60799.9773.625593
HSA-MIR-551B-5P99.9671.283493
HSA-MIR-205-3P99.9269.923165
HSA-MIR-806399.9169.763146
HSA-MIR-990299.8969.152250
HSA-MIR-469899.8471.414303
HSA-MIR-1212999.7267.451311
HSA-MIR-561-3P99.6470.903647
HSA-MIR-426199.5970.303415
HSA-MIR-549A-3P99.5468.17825
HSA-MIR-147B-5P99.4570.622432
HSA-MIR-2116-5P99.3269.341273
HSA-MIR-125798.9768.021133
HSA-MIR-16-1-3P98.7069.231538
HSA-MIR-1-5P98.7068.661017
HSA-MIR-394598.6864.21553
HSA-MIR-124898.4767.541314
HSA-MIR-3187-5P98.3665.741776
HSA-MIR-1285-3P97.7267.021932
HSA-MIR-5189-5P97.7266.961814
HSA-MIR-4797-3P97.4867.14989
HSA-MIR-5187-3P97.2867.101037
HSA-MIR-61297.2665.951597
HSA-MIR-686097.2166.311656
HSA-MIR-3184-3P96.9666.91845
HSA-MIR-151A-3P95.5265.29516

Literature-anchored findings (GeneRIF, showing 36)

  • common polymorphisms in the IFNgamma/IL-26 gene region may contribute to sex bias in susceptibility to rheumatoid arthritis, by distorting the propensity of female carriers versus male carriers to contract this disease. (PMID:14558082)
  • The active receptor complex for IL-26 is a heterodimer composed of two receptor proteins: IL-20 receptor 1 and IL-10 receptor 2. Signaling through the IL-26 receptor results in activation of STAT1 and STAT3. (PMID:14764663)
  • sensitivity to recombinant interleukin-26(IL-26) of various cell lines strictly correlated with the expression of IL-20 receptor 1 and blocking antibodies against either IL-10 receptor 2 or IL-20 receptor 1 inhibited IL-26-dependent signal transduction (PMID:15178681)
  • Identify a second enhancer element positioned between IL26 and IFNG required for both IL26 and IFNG expression. One function of this enhancer is to facilitate recruitment of RNA polymerase II to promoters of both genes. (PMID:22622197)
  • IL-26 appears as a novel proinflammatory cytokine, located upstream of the proinflammatory cascade, that may constitute a promising target to treat rheumatoid arthritis and chronic inflammatory disorders. (PMID:23055831)
  • IL-26 differentially modulates the infection by different enveloped viruses. (PMID:23875025)
  • The negative influence of IL-26 on the anti-mycobacterial activity and its constitutive presence in both serum and monocyte supernatants prompt a proposal that IL26 as a candidate gene for tuberculosis susceptibility. (PMID:25157980)
  • IL-26 is emerging as a potentially important player in host defense and may also be a pathogenic factor in the chronic inflammatory disorders of humans. [Review] (PMID:26202572)
  • this study shows that single nucleotide polymorphism near IL-26 gene is associated with familial vitiligo and existence of halo nevi in Estonian patients (PMID:26429320)
  • Our study indicates that IL-26 is a potential biomarker of disease severity in pediatric asthma without signs of Th2-mediated inflammation. (PMID:27029915)
  • this study shows that IL-26 is a unique cationic protein more similar to a soluble pattern recognition receptor than to conventional cytokines (PMID:28356384)
  • IL-26 levels are higher in synovial fluid compared to plasma in spondyloarthritis. IL-26 was identified in axial facet joints of spondyloarthritis patients. Myofibroblasts from the spondyloarthritis synovium produce large amounts of IL-26. IL-26 induces bone mineralization in human osteoblasts. (PMID:28365787)
  • this paper shows that IL-26 is overexpressed in Behcet’s disease and enhances Th17 related -cytokines (PMID:28811236)
  • IL-26 activates STAT1/3 and leads to the induction of IL-6 and IL-8 expression in non-transformed cells derived from human colon. (PMID:28852311)
  • The varIL26 genotype is associated with reduced PMN capacity to kill bacteria. A varIL26 genotype is associated with decreased levels of anti-TNF-alpha in CD patients. IL26 may help explain the role of bactDNA as a risk factor of flare in CD patients. (PMID:28879509)
  • non-specific T-cell killing represents an efficient amplification mechanism of the initially Ag-specific allergic reaction. Our findings suggest that IL-26 could play a crucial role in this amplification mechanism being an allergen independent cytokine highly expressed in ACD patients and constitutively ready to act in complex killing system proper of this disease. (PMID:29498775)
  • increased in airways by long-term but not by short-term tobacco smoking (PMID:29780024)
  • IL-26 acted directly on vascular endothelial cells, promoting proliferation and tube formation, possibly through protein kinase B, extracellular signal-regulated kinase, and NF-kappaB pathways (PMID:30423328)
  • A new T helper 17 cytokine in hidradenitis suppurativa: antimicrobial and proinflammatory role of interleukin-26. (PMID:30829398)
  • IL-26 promotes IL-22 secretion and Th22 generation by CD4(+) T cells isolated from tuberculous pleural effusion patients. IL-26 may play an active role in the pathogenesis of tuberculous pleurisy. (PMID:30834948)
  • the Th17 cytokine IL-26 contributes to host defense against intracellular bacteria (PMID:30939123)
  • IL-26 is an independent prognostic factor indicating unfavorable prognosis in hepatocellular carcinoma patients with liver resection. (PMID:30956053)
  • Increased IL-26 Expression Promotes T Helper Type 17- and T Helper Type 2-Associated Cytokine Production by Keratinocytes in Atopic Dermatitis. (PMID:31465744)
  • An observational study suggests IL-26 as a novel potential indicator for inflammation in chronic HBV infection and provides some new information about the mechanism underlying the serum IL-26 elevation in chronic hepatitis B patients. (PMID:31895778)
  • Interleukin 26 Skews Macrophage Polarization Towards M1 Phenotype by Activating cJUN and the NF-kappaB Pathway. (PMID:32290250)
  • IL26, a Noncanonical Mediator of DNA Inflammatory Stimulation, Promotes TNBC Engraftment and Progression in Association with Neutrophils. (PMID:32366475)
  • IL-26 gene variants and protein expression in Tunisian asthmatic patients. (PMID:32683104)
  • Interleukin-26 activates macrophages and facilitates killing of Mycobacterium tuberculosis. (PMID:33057074)
  • Serum Interleukin-26 Is a New Biomarker for Disease Activity Assessment in Systemic Lupus Erythematosus. (PMID:34054830)
  • Interleukin-26 Has Synergistic Catabolic Effects with Palmitate in Human Articular Chondrocytes via the TLR4-ERK1/2-c-Jun Signaling Pathway. (PMID:34572149)
  • Complex Involvement of Interleukin-26 in Bacterial Lung Infection. (PMID:34777376)
  • Interleukin-26-DNA complexes promote inflammation and dermal-epidermal separation in a modified human cryosection model of bullous pemphigoid. (PMID:36311716)
  • IL-26 modulates T cell function in autoimmune hepatitis. (PMID:37155188)
  • Systemic IL-26 correlates with improved asthma control in children sensitized to dog allergen. (PMID:38622712)
  • Increased interleukin-26 in the peripheral joints of patients with axial spondyloarthritis and psoriatic arthritis, co-localizing with CD68-positive synoviocytes. (PMID:38799447)
  • The evolving landscape of IL-10, IL-22 and IL-26 in pleurisy especially in tuberculous pleurisy. (PMID:39003443)

Cross-species orthologs

0 orthologs

Paralogs (4): IL10 (ENSG00000136634), IL19 (ENSG00000142224), IL20 (ENSG00000162891), IL24 (ENSG00000162892)

Protein

Protein identifiers

Interleukin-26Q9NPH9 (reviewed: Q9NPH9)

Alternative names: Protein AK155

All UniProt accessions (2): Q9NPH9, A0A7R8GUW8

UniProt curated annotations — full annotation on UniProt →

Function. May play a role in local mechanisms of mucosal immunity and seems to have a pro-inflammatory function. May play a role in inflammatory bowel disease. Activates STAT1 and STAT3, MAPK1/3 (ERK1/2), JUN and AKT. Induces expression of SOCS3, TNF and IL-8, secretion of IL-8 and IL-10 and surface expression of ICAM1. Decreases proliferation of intestinal epithelial cells. Is inhibited by heparin.

Subunit / interactions. Homodimer.

Subcellular location. Secreted.

Tissue specificity. Expressed in HVS transformed T-cells but not other T-cell lines or primary stimulated T-cells. Expressed in colonic T-cells including Th17 inflammatory T-cells; the expression is significantly increased in serum of patients with Crohn’s disease (at protein level).

Induction. By Herpesvirus saimiri infection.

Similarity. Belongs to the IL-10 family.

RefSeq proteins (1): NP_060872* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR0090794_helix_cytokine-like_coreHomologous_superfamily
IPR020423IL-10_CSConserved_site
IPR020443IL-10/19/20/24/26Family

Pfam: PF00726

UniProt features (2 total): signal peptide 1, chain 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9NPH9-F185.810.68

Function

Pathways and Gene Ontology

Reactome pathways

1 pathways

IDPathway
R-HSA-8854691Interleukin-20 family signaling

MSigDB gene sets: 77 (showing top): GOBP_NEGATIVE_REGULATION_OF_EPITHELIAL_CELL_PROLIFERATION, GOBP_REGULATION_OF_STRESS_ACTIVATED_PROTEIN_KINASE_SIGNALING_CASCADE, REACTOME_CYTOKINE_SIGNALING_IN_IMMUNE_SYSTEM, GOBP_INFLAMMATORY_RESPONSE, GOBP_POSITIVE_REGULATION_OF_MAPK_CASCADE, GOBP_POSITIVE_REGULATION_OF_CYTOKINE_PRODUCTION, GOBP_CELL_SURFACE_RECEPTOR_SIGNALING_PATHWAY_VIA_JAK_STAT, GOBP_POSITIVE_REGULATION_OF_STRESS_ACTIVATED_PROTEIN_KINASE_SIGNALING_CASCADE, GOBP_CELL_CELL_SIGNALING, GOBP_PHOSPHATIDYLINOSITOL_3_KINASE_PROTEIN_KINASE_B_SIGNAL_TRANSDUCTION, GOBP_CYTOKINE_PRODUCTION, GOBP_REGULATION_OF_RESPONSE_TO_STRESS, NIKOLSKY_BREAST_CANCER_12Q13_Q21_AMPLICON, GOBP_POSITIVE_REGULATION_OF_INTRACELLULAR_SIGNAL_TRANSDUCTION, GOBP_POSITIVE_REGULATION_OF_PHOSPHATIDYLINOSITOL_3_KINASE_PROTEIN_KINASE_B_SIGNAL_TRANSDUCTION

GO Biological Process (10): positive regulation of cytokine production (GO:0001819), immune response (GO:0006955), cell-cell signaling (GO:0007267), positive regulation of stress-activated MAPK cascade (GO:0032874), positive regulation of transcription by RNA polymerase II (GO:0045944), positive regulation of receptor signaling pathway via JAK-STAT (GO:0046427), negative regulation of epithelial cell proliferation (GO:0050680), positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction (GO:0051897), positive regulation of ERK1 and ERK2 cascade (GO:0070374), signal transduction (GO:0007165)

GO Molecular Function (1): cytokine activity (GO:0005125)

GO Cellular Component (3): extracellular region (GO:0005576), obsolete extracellular space (GO:0005615), cytosol (GO:0005829)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Signaling by Interleukins1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cell communication2
signaling2
positive regulation of MAPK cascade2
cellular anatomical structure2
cytokine production1
regulation of cytokine production1
positive regulation of gene expression1
positive regulation of multicellular organismal process1
immune system process1
response to stimulus1
regulation of stress-activated MAPK cascade1
stress-activated MAPK cascade1
positive regulation of stress-activated protein kinase signaling cascade1
regulation of transcription by RNA polymerase II1
transcription by RNA polymerase II1
positive regulation of DNA-templated transcription1
cell surface receptor signaling pathway via JAK-STAT1
regulation of receptor signaling pathway via JAK-STAT1
positive regulation of receptor signaling pathway via STAT1
negative regulation of cell population proliferation1
epithelial cell proliferation1
regulation of epithelial cell proliferation1
phosphatidylinositol 3-kinase/protein kinase B signal transduction1
regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction1
positive regulation of intracellular signal transduction1
ERK1 and ERK2 cascade1
regulation of ERK1 and ERK2 cascade1
cellular process1
regulation of cellular process1
cellular response to stimulus1
receptor ligand activity1
cytoplasm1

Protein interactions and networks

STRING

806 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
IL26IL10RBQ08334993
IL26IL20RAQ9UHF4980
IL26IL22RA1Q8N6P7921
IL26IL20RBQ6UXL0896
IL26IL19Q9UHD0887
IL26IL22Q9GZX6831
IL26IL24Q13007824
IL26IFNLR1Q8IU57820
IL26IL10RAQ13651807
IL26IL17AQ16552799
IL26IFNL2Q8IZJ0799
IL26IFNL1Q8IU54797
IL26IL17FQ96PD4741
IL26IL23RQ5VWK5734
IL26IFNL3Q8IZI9724

IntAct

2 interactions, top by confidence:

ABTypeScore
IL26YLPM1psi-mi:“MI:0914”(association)0.350

BioGRID (8): CASP6 (Affinity Capture-MS), C11orf84 (Affinity Capture-MS), YLPM1 (Affinity Capture-MS), RBMXL1 (Affinity Capture-MS), ARGLU1 (Affinity Capture-MS), S100P (Reconstituted Complex), S100A6 (Reconstituted Complex), APP (Reconstituted Complex)

ESM2 similar proteins: A2T6Z6, A7UHZ5, O35256, O35257, O46673, O77812, O97798, P01574, P01575, P01576, P01577, P01578, P03180, P05012, P09320, P0C6Z6, P0CAP9, P0DMS7, P18121, P18893, P18917, P29456, P34207, P46651, P47965, P48411, P51496, P51497, P55029, P68677, P68678, P70499, P79338, Q07370, Q0Z972, Q29055, Q5Q0V6, Q6XZW6, Q7TSL0, Q80ZF2

Diamond homologs: A2T6Z6, P03180, P0C6Z6, P0CAP9, P22301, Q9NPH9

SIGNOR signaling

2 interactions.

AEffectBMechanism
IL26up-regulatesIL10RBbinding
IL26up-regulatesIL20RAbinding

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance30
Likely benign1
Benign1

Top pathogenic / likely-pathogenic (0)

SpliceAI

425 predictions. Top by Δscore:

VariantEffectΔscore
12:68201932:C:CCacceptor_gain1.0000
12:68225147:A:ACdonor_gain1.0000
12:68225148:C:CCdonor_gain1.0000
12:68225148:CA:Cdonor_gain1.0000
12:68225148:CACA:Cdonor_gain1.0000
12:68201927:CCAAT:Cacceptor_gain0.9900
12:68201928:CAAT:Cacceptor_gain0.9900
12:68201928:CAATC:Cacceptor_gain0.9900
12:68201929:AATCT:Aacceptor_loss0.9900
12:68201930:ATC:Aacceptor_loss0.9900
12:68201931:TC:Tacceptor_loss0.9900
12:68201932:C:CGacceptor_loss0.9900
12:68201933:T:Gacceptor_loss0.9900
12:68202016:AC:Adonor_gain0.9900
12:68202017:CC:Cdonor_gain0.9900
12:68225140:TATAC:Tdonor_loss0.9900
12:68225141:ATAC:Adonor_loss0.9900
12:68225142:TACTT:Tdonor_loss0.9900
12:68225143:ACTT:Adonor_loss0.9900
12:68225144:C:CAdonor_loss0.9900
12:68225145:TTACA:Tdonor_loss0.9900
12:68225146:TA:Tdonor_loss0.9900
12:68225146:TAC:Tdonor_gain0.9900
12:68225147:A:Gdonor_loss0.9900
12:68225147:ACA:Adonor_gain0.9900
12:68225148:C:Tdonor_loss0.9900
12:68225148:CAC:Cdonor_gain0.9900
12:68225148:CACAG:Cdonor_gain0.9900
12:68225279:TTTTT:Tacceptor_gain0.9900
12:68225280:TTTT:Tacceptor_gain0.9900

AlphaMissense

1136 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
12:68201908:T:AK151N0.969
12:68201908:T:GK151N0.969
12:68225248:G:CF88L0.944
12:68225248:G:TF88L0.944
12:68225250:A:GF88L0.944
12:68225475:A:GL66S0.940
12:68201897:T:AE155V0.910
12:68202024:A:CF141L0.905
12:68202024:A:TF141L0.905
12:68202026:A:GF141L0.905
12:68201877:A:GW162R0.898
12:68201877:A:TW162R0.898
12:68225472:A:GL67S0.897
12:68225447:A:CF75L0.888
12:68225447:A:TF75L0.888
12:68225449:A:GF75L0.888
12:68201909:T:AK151I0.883
12:68201907:C:GA152P0.864
12:68202033:T:AK138N0.861
12:68202033:T:GK138N0.861
12:68201897:T:GE155A0.853
12:68225448:A:GF75S0.839
12:68225249:A:GF88S0.838
12:68225598:T:AK53N0.838
12:68225598:T:GK53N0.838
12:68202034:T:AK138I0.833
12:68201894:A:GL156P0.832
12:68225245:G:CF89L0.830
12:68225245:G:TF89L0.830
12:68225247:A:GF89L0.830

dbSNP variants (sampled 300 via entrez): RS1000007312 (12:68225249 A>G), RS1000134161 (12:68226783 T>C), RS1000371251 (12:68219284 T>C), RS1000437279 (12:68201447 T>G), RS1000447960 (12:68220390 A>T), RS1000508549 (12:68202976 A>T), RS1000539942 (12:68207623 T>A,C), RS1000648843 (12:68214029 C>G), RS1000870922 (12:68215205 A>G), RS1000942378 (12:68214828 C>T), RS1000969704 (12:68220950 T>G), RS1001059942 (12:68222047 A>C), RS1001163295 (12:68207379 AC>A), RS1001254848 (12:68220708 C>A), RS1001386441 (12:68222418 G>A)

Disease associations

OMIM: gene MIM:605679 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

6 associations (top):

StudyTraitp-value
GCST000311_11Ulcerative colitis5.000000e-07
GCST000311_2Ulcerative colitis3.000000e-12
GCST000624_12Ulcerative colitis4.000000e-12
GCST000964_37Ulcerative colitis1.000000e-16
GCST001725_19Inflammatory bowel disease9.000000e-32
GCST004866_10Alopecia areata4.000000e-07

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

10 total (human), top 10 by PubMed support.

ChemicalActions (top 5)PubMed papers
2,5,2’,5’-tetrachlorobiphenylincreases expression1
pentanaldecreases expression1
Arsenic Trioxideincreases expression1
Acetaminophendecreases expression1
Benzo(a)pyreneaffects methylation1
Cadmiumincreases abundance, increases expression1
Mustard Gasincreases expression1
Nickelincreases expression1
Dinoprostonedecreases expression1
Cadmium Chlorideincreases abundance, increases expression1

Clinical trials (associated diseases)

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

  • Disease cohort memberships (association, not causation — diseases whose associated-gene cohort lists this gene; a subset are also under Associated diseases): alopecia areata