LRRC8B

gene
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Also known as TA-LRRPKIAA0231

Summary

LRRC8B (leucine rich repeat containing 8 VRAC subunit B, HGNC:30692) is a protein-coding gene on chromosome 1p22.2, encoding Volume-regulated anion channel subunit LRRC8B (Q6P9F7). Non-essential component of the volume-regulated anion channel (VRAC, also named VSOAC channel), an anion channel required to maintain a constant cell volume in response to extracellular or intracellular osmotic changes.

Contributes to volume-sensitive anion channel activity. Involved in monoatomic anion transmembrane transport. Located in cytoplasm and plasma membrane. Part of monoatomic ion channel complex.

Source: NCBI Gene 23507 — RefSeq curated summary.

At a glance

  • GWAS associations: 6
  • Clinical variants (ClinVar): 78 total
  • MANE Select transcript: NM_001369817

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:30692
Approved symbolLRRC8B
Nameleucine rich repeat containing 8 VRAC subunit B
Location1p22.2
Locus typegene with protein product
StatusApproved
AliasesTA-LRRP, KIAA0231
Ensembl geneENSG00000197147
Ensembl biotypeprotein_coding
OMIM612888
Entrez23507

Gene structure

Transcript identifiers

Ensembl transcripts: 6 — 6 protein_coding

ENST00000330947, ENST00000439853, ENST00000449440, ENST00000639264, ENST00000640258, ENST00000882796

RefSeq mRNA: 4 — MANE Select: NM_001369817 NM_001134476, NM_001369817, NM_001369819, NM_015350

CCDS: CCDS724

Canonical transcript exons

ENST00000330947 — 6 exons

ExonStartEnd
ENSE000010673768958262589584789
ENSE000013695648956824789568307
ENSE000013816498957959189579688
ENSE000013904518956843989568493
ENSE000014527598959277189597861
ENSE000038989988952482989525022

Expression profiles

Bgee: expression breadth ubiquitous, 260 present calls, max score 97.29.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 12.4378 / max 488.7921, expressed in 1527 samples.

FANTOM5 promoters (3 alternative TSS)

Promoter IDTPM avgSamples expressed
39626.97581272
39615.19901354
39600.2631105

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
Brodmann (1909) area 23UBERON:001355497.29gold quality
middle temporal gyrusUBERON:000277195.65gold quality
endothelial cellCL:000011595.11gold quality
oocyteCL:000002393.80gold quality
secondary oocyteCL:000065592.96gold quality
orbitofrontal cortexUBERON:000416792.23gold quality
superior frontal gyrusUBERON:000266192.16gold quality
Brodmann (1909) area 46UBERON:000648392.02gold quality
primary visual cortexUBERON:000243691.82gold quality
postcentral gyrusUBERON:000258191.58gold quality
entorhinal cortexUBERON:000272890.90gold quality
parietal lobeUBERON:000187290.87gold quality
adrenal tissueUBERON:001830390.12gold quality
occipital lobeUBERON:000202189.42gold quality
prefrontal cortexUBERON:000045189.28gold quality
bronchial epithelial cellCL:000232887.08gold quality
Brodmann (1909) area 9UBERON:001354086.75gold quality
epithelium of nasopharynxUBERON:000195186.65gold quality
dorsolateral prefrontal cortexUBERON:000983486.65gold quality
frontal cortexUBERON:000187086.59gold quality
epithelium of bronchusUBERON:000203186.34gold quality
cerebral cortexUBERON:000095686.06gold quality
neocortexUBERON:000195085.80gold quality
bronchusUBERON:000218585.77gold quality
gingival epitheliumUBERON:000194985.16gold quality
corpus callosumUBERON:000233685.14gold quality
CA1 field of hippocampusUBERON:000388185.11gold quality
nasal cavity epitheliumUBERON:000538484.35silver quality
gingivaUBERON:000182884.34gold quality
Ammon’s hornUBERON:000195484.15gold quality

Single-cell (SCXA)

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

ExperimentMarker?Max mean expression
E-ANND-3yes6.73

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

221 targeting LRRC8B, 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-30A-5P100.0076.313233
HSA-MIR-30B-5P100.0076.293248
HSA-MIR-30C-5P100.0076.293248
HSA-MIR-30D-5P100.0076.323233
HSA-MIR-30E-5P100.0076.323242
HSA-MIR-4776-3P100.0068.731340
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-3163100.0077.238605
HSA-MIR-5011-5P100.0083.465820
HSA-MIR-6867-5P100.0082.213464
HSA-MIR-1277-5P100.0073.955056
HSA-MIR-3646100.0073.565283
HSA-MIR-366299.9973.825684
HSA-MIR-428299.9975.366408
HSA-MIR-607799.9968.042299
HSA-MIR-548AW99.9972.573559
HSA-MIR-548C-3P99.9974.017587
HSA-MIR-6759-5P99.9966.54785
HSA-MIR-223-3P99.9970.141140
HSA-MIR-513B-5P99.9969.962150
HSA-MIR-196A-1-3P99.9972.152772
HSA-MIR-450099.9972.722367
HSA-MIR-477599.9875.006394
HSA-MIR-569699.9872.364487
HSA-MIR-19A-3P99.9875.332762
HSA-MIR-19B-3P99.9875.442754
HSA-MIR-499A-5P99.9870.791323

Literature-anchored findings (GeneRIF, showing 2)

  • identified four genes, named TA-LRRP, AD158, LRRC5, and FLJ23420, as unknown LRRC8-like genes (PMID:15094057)
  • LRRC8B participates in intracellular Ca(2+) homeostasis by acting as a leak channel in the endoplasmic reticulum. (PMID:28972132)

Cross-species orthologs

2 orthologs

OrganismSymbolGene ID
mus_musculusLrrc8bENSMUSG00000070639
rattus_norvegicusLrrc8bENSRNOG00000002129

Paralogs (31): LRRC7 (ENSG00000033122), PHLPP2 (ENSG00000040199), LRRC40 (ENSG00000066557), LRCH4 (ENSG00000077454), PHLPP1 (ENSG00000081913), SHOC2 (ENSG00000108061), ERBIN (ENSG00000112851), LRRC39 (ENSG00000122477), LRCH2 (ENSG00000130224), LRCH1 (ENSG00000136141), LRRC8A (ENSG00000136802), LRRC1 (ENSG00000137269), MFHAS1 (ENSG00000147324), LRRC27 (ENSG00000148814), LRRK1 (ENSG00000154237), LRRC58 (ENSG00000163428), LRRC2 (ENSG00000163827), LRRC18 (ENSG00000165383), LRRC28 (ENSG00000168904), LRRC8E (ENSG00000171017), LRRC8C (ENSG00000171488), LRRC8D (ENSG00000171492), PIDD1 (ENSG00000177595), SCRIB (ENSG00000180900), LRCH3 (ENSG00000186001), LRRIQ4 (ENSG00000188306), LRRC10 (ENSG00000198812), LRRC10B (ENSG00000204950), LRRC30 (ENSG00000206422), LRRC69 (ENSG00000214954), LRRD1 (ENSG00000240720)

Protein

Protein identifiers

Volume-regulated anion channel subunit LRRC8BQ6P9F7 (reviewed: Q6P9F7)

Alternative names: Leucine-rich repeat-containing protein 8B, T-cell activation leucine repeat-rich protein

All UniProt accessions (4): A0A384N5V6, A0A7I2RK03, C9JGJ7, Q6P9F7

UniProt curated annotations — full annotation on UniProt →

Function. Non-essential component of the volume-regulated anion channel (VRAC, also named VSOAC channel), an anion channel required to maintain a constant cell volume in response to extracellular or intracellular osmotic changes. The VRAC channel conducts iodide better than chloride and can also conduct organic osmolytes like taurine. Channel activity requires LRRC8A plus at least one other family member (LRRC8B, LRRC8C, LRRC8D or LRRC8E); channel characteristics depend on the precise subunit composition.

Subunit / interactions. Heterohexamer; oligomerizes with other LRRC8 proteins (LRRC8A, LRRC8C, LRRC8D and/or LRRC8E) to form a heterohexamer. In vivo, the subunit composition may depend primarily on expression levels, and heterooligomeric channels containing various proportions of the different LRRC8 proteins may coexist.

Subcellular location. Cell membrane. Endoplasmic reticulum membrane.

Domain organisation. The volume-regulated anion channel (VRAC) channel forms a trimer of dimers, with symmetry mismatch between the pore-forming domain and the cytosolic LRR repeats, a topology similar to gap junction proteins.

Similarity. Belongs to the LRRC8 family.

RefSeq proteins (4): NP_001127948, NP_001356746, NP_001356748, NP_056165 (=MANE)

Domains & families (InterPro)

IDNameType
IPR001611Leu-rich_rptRepeat
IPR003591Leu-rich_rpt_typical-subtypRepeat
IPR021040LRRC8_Pannexin-likeDomain
IPR026906LRR_5Repeat
IPR032675LRR_dom_sfHomologous_superfamily
IPR052595LRRC69/RLPFamily

Pfam: PF12534, PF13306, PF13855

Catalyzed reactions (Rhea), 3 shown:

  • chloride(in) = chloride(out) (RHEA:29823)
  • iodide(out) = iodide(in) (RHEA:66324)
  • taurine(out) = taurine(in) (RHEA:66328)

UniProt features (34 total): repeat 13, topological domain 5, transmembrane region 4, sequence variant 4, modified residue 2, disulfide bond 2, sequence conflict 2, chain 1, glycosylation site 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q6P9F7-F181.760.36

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 (2): 186, 196

Disulfide bonds (2): 55–304, 109–289

Glycosylation sites (1): 78

Function

Pathways and Gene Ontology

Reactome pathways

2 pathways

IDPathway
R-HSA-5223345Miscellaneous transport and binding events
R-HSA-382551Transport of small molecules

MSigDB gene sets: 168 (showing top): GOBP_AMINO_ACID_TRANSMEMBRANE_TRANSPORT, GOBP_NUCLEOTIDE_TRANSPORT, GOBP_ORGANIC_ACID_TRANSPORT, GOBP_ORGANOPHOSPHATE_ESTER_TRANSPORT, GOBP_NUCLEOTIDE_TRANSMEMBRANE_TRANSPORT, GOBP_AMINO_ACID_TRANSPORT, GOBP_NUCLEOBASE_CONTAINING_COMPOUND_TRANSPORT, GOBP_ORGANIC_ANION_TRANSPORT, GOBP_DICARBOXYLIC_ACID_TRANSPORT, GOBP_PURINE_NUCLEOTIDE_TRANSPORT, GOBP_ACIDIC_AMINO_ACID_TRANSPORT, HAN_SATB1_TARGETS_DN, GOBP_IMPORT_INTO_CELL, chr1p22, GOBP_CARBOHYDRATE_DERIVATIVE_TRANSPORT

GO Biological Process (5): aspartate transmembrane transport (GO:0015810), monoatomic anion transmembrane transport (GO:0098656), cyclic-GMP-AMP transmembrane import across plasma membrane (GO:0140361), monoatomic ion transport (GO:0006811), monoatomic ion transmembrane transport (GO:0034220)

GO Molecular Function (2): volume-sensitive anion channel activity (GO:0005225), protein binding (GO:0005515)

GO Cellular Component (6): cytoplasm (GO:0005737), endoplasmic reticulum membrane (GO:0005789), plasma membrane (GO:0005886), monoatomic ion channel complex (GO:0034702), endoplasmic reticulum (GO:0005783), membrane (GO:0016020)

Reactome top-level categories

Rollup of top-1 pathways:

CategoryPathways
Transport of small molecules1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure2
amino acid transmembrane transport1
C4-dicarboxylate transport1
acidic amino acid transport1
nitrogen compound transport1
carboxylic acid transmembrane transport1
monoatomic anion transport1
monoatomic ion transmembrane transport1
purine ribonucleotide transport1
adenine nucleotide transport1
cyclic nucleotide transport1
import across plasma membrane1
guanine nucleotide transmembrane transport1
transport1
monoatomic ion transport1
transmembrane transport1
monoatomic anion channel activity1
binding1
intracellular anatomical structure1
organelle membrane1
nuclear outer membrane-endoplasmic reticulum membrane network1
endoplasmic reticulum subcompartment1
membrane1
cell periphery1
transmembrane transporter complex1
cytoplasm1
endomembrane system1
intracellular membrane-bounded organelle1

Protein interactions and networks

STRING

1060 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
LRRC8BLRRC8AQ8IWT6580
LRRC8BBEST1O76090577
LRRC8BTTYH2Q9BSA4570
LRRC8BCLCA2Q9UQC9550
LRRC8BCLCN3P51790541
LRRC8BCLCA4Q14CN2514
LRRC8BTTYH3Q9C0H2503
LRRC8BTTYH1Q9H313494
LRRC8BSTK32CQ86UX6486
LRRC8BSLC41A1Q8IVJ1471
LRRC8BCFTRP13569461
LRRC8BCLCA1A8K7I4461
LRRC8BANO1Q5XXA6456
LRRC8BBEST3Q8N1M1450
LRRC8BHEPACAMQ14CZ8447

IntAct

8 interactions, top by confidence:

ABTypeScore
LRRC8ALRRC8Bpsi-mi:“MI:0915”(physical association)0.740
LRRC8BSLC25A17psi-mi:“MI:0914”(association)0.530
LRRC8Bpsi-mi:“MI:0915”(physical association)0.400
TTYH1TMEM223psi-mi:“MI:0914”(association)0.350
LRRC8BCDH2psi-mi:“MI:0914”(association)0.350

BioGRID (66): LRRC8D (Affinity Capture-MS), LRRC8C (Affinity Capture-MS), LRRC8A (Affinity Capture-MS), LRRC8E (Affinity Capture-MS), TSPAN3 (Affinity Capture-MS), ATP2A3 (Affinity Capture-MS), SLC44A1 (Affinity Capture-MS), ABCB9 (Affinity Capture-MS), TMEM164 (Affinity Capture-MS), ANO6 (Affinity Capture-MS), TM2D3 (Affinity Capture-MS), SLC25A17 (Affinity Capture-MS), ADCK2 (Affinity Capture-MS), LMBR1 (Affinity Capture-MS), CHPT1 (Affinity Capture-MS)

ESM2 similar proteins: A0JM56, A0JPI9, A2BFL2, A5PK13, A6H639, J9SQF3, O13066, P19686, P33402, Q02108, Q0VAA2, Q14BP6, Q15111, Q15813, Q3USB7, Q498T9, Q4R642, Q4V8D9, Q4ZHS0, Q5DU41, Q5FVQ9, Q5RAG3, Q5RBD9, Q5RJH2, Q5ZIJ9, Q5ZIU8, Q62688, Q68F79, Q6DN12, Q6GQN5, Q6NU09, Q6P9F7, Q6WRX3, Q7Z7L7, Q80ZJ6, Q8BG40, Q8CDU4, Q8CIR4, Q8CIV8, Q8HXA6

Diamond homologs: A5PK13, Q3KRC6, Q498T9, Q4V8I7, Q5DU41, Q5U308, Q66JT1, Q68F79, Q6NSJ5, Q6NU09, Q6P9F7, Q7L1W4, Q80WG5, Q8BGR2, Q8IWT6, Q8R502, Q8TDW0, D4AC13, O35103, O35367, O42235, O46378, O46379, O60938, O62702, O75093, O77742, P13605, P24014, P28654, P28675, P50608, P50609, P51884, P51885, P51886, P51887, P51888, P51890, P58681

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance66
Likely benign2
Benign5

Top pathogenic / likely-pathogenic (0)

SpliceAI

1714 predictions. Top by Δscore:

VariantEffectΔscore
1:89568308:G:GGdonor_gain1.0000
1:89528327:T:Gdonor_gain0.9900
1:89568304:T:Gdonor_gain0.9900
1:89568304:TTAA:Tdonor_loss0.9900
1:89568305:TAAGT:Tdonor_loss0.9900
1:89568307:AGT:Adonor_loss0.9900
1:89568308:GT:Gdonor_loss0.9900
1:89568309:T:TCdonor_loss0.9900
1:89568492:GG:Gdonor_gain0.9900
1:89568493:GG:Gdonor_gain0.9900
1:89579684:CTGTA:Cdonor_gain0.9900
1:89579686:GTA:Gdonor_gain0.9900
1:89579689:G:GGdonor_gain0.9900
1:89582623:A:AGacceptor_gain0.9900
1:89582624:G:GGacceptor_gain0.9900
1:89584790:G:GGdonor_gain0.9900
1:89552842:G:GTdonor_gain0.9800
1:89568241:CCCTA:Cacceptor_loss0.9800
1:89568242:CCTA:Cacceptor_loss0.9800
1:89568243:CTA:Cacceptor_loss0.9800
1:89568245:A:Gacceptor_loss0.9800
1:89568311:AGTTA:Adonor_loss0.9800
1:89568433:CCTTA:Cacceptor_loss0.9800
1:89568434:CTTAG:Cacceptor_loss0.9800
1:89568435:TTA:Tacceptor_loss0.9800
1:89568436:TAGGA:Tacceptor_loss0.9800
1:89568437:A:Tacceptor_loss0.9800
1:89568438:G:GTacceptor_loss0.9800
1:89582624:GTTT:Gacceptor_gain0.9800
1:89592937:G:GTdonor_gain0.9800

AlphaMissense

5278 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
1:89583140:T:AW164R1.000
1:89583140:T:CW164R1.000
1:89583809:T:CF387L1.000
1:89583810:T:CF387S1.000
1:89583811:C:AF387L1.000
1:89583811:C:GF387L1.000
1:89582720:T:AW24R0.999
1:89582720:T:CW24R0.999
1:89582975:T:AC109S0.999
1:89582975:T:CC109R0.999
1:89582976:G:AC109Y0.999
1:89582976:G:CC109S0.999
1:89582977:T:GC109W0.999
1:89583117:T:CL156P0.999
1:89583125:T:CC159R0.999
1:89583127:C:GC159W0.999
1:89583142:G:CW164C0.999
1:89583142:G:TW164C0.999
1:89583362:T:CF238L0.999
1:89583364:T:AF238L0.999
1:89583364:T:GF238L0.999
1:89583384:G:CR245P0.999
1:89583560:T:AC304S0.999
1:89583560:T:CC304R0.999
1:89583561:G:CC304S0.999
1:89583562:T:GC304W0.999
1:89583689:T:CF347L0.999
1:89583691:T:AF347L0.999
1:89583691:T:GF347L0.999
1:89583743:G:CD365H0.999

dbSNP variants (sampled 300 via entrez): RS1000031664 (1:89549334 T>C), RS1000086693 (1:89548903 C>T), RS1000149310 (1:89587976 A>G), RS1000157978 (1:89542090 C>T), RS1000189578 (1:89522691 C>T), RS1000283792 (1:89555970 C>T), RS1000297940 (1:89561373 C>T), RS1000303972 (1:89593660 A>G), RS1000325431 (1:89542798 C>A,T), RS1000395392 (1:89555113 G>A), RS1000489626 (1:89563604 A>T), RS1000495194 (1:89571199 T>C), RS1000574343 (1:89567151 T>C), RS1000576940 (1:89525333 C>G,T), RS1000583047 (1:89560087 A>G)

Disease associations

OMIM: gene MIM:612888 | 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
GCST001999_2Adverse response to chemotherapy (neutropenia/leucopenia) (paclitaxel)9.000000e-07
GCST002006_5Adverse response to chemotherapy (neutropenia/leucopenia) (paclitaxel + carboplatin)3.000000e-06
GCST009391_524Metabolite levels7.000000e-06
GCST012071_3Response to selenium supplementation (change in plasma selenium concentration)3.000000e-06
GCST90002393_35Monocyte count4.000000e-16
GCST90002394_142Monocyte percentage of white cells2.000000e-12

EFO canonical traits (4, from GWAS)

EFO IDTrait name
EFO:0010117pyruvate measurement
EFO:0600021response to dietary selenium supplementation
EFO:0005091monocyte count
EFO:0007989monocyte percentage of leukocytes

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Valproic Acidaffects cotreatment, decreases expression, decreases methylation, increases expression6
trichostatin Aaffects cotreatment, decreases expression3
Estradiolaffects cotreatment, decreases expression, increases expression3
methacrylaldehydeaffects cotreatment, decreases expression, increases abundance2
entinostataffects cotreatment, decreases expression2
Panobinostataffects cotreatment, decreases expression2
Acroleinaffects cotreatment, decreases expression, increases abundance2
Arsenicaffects methylation, affects cotreatment, increases abundance, increases expression2
Ozoneaffects cotreatment, decreases expression, increases abundance2
Phenylmercuric Acetateaffects cotreatment, decreases expression2
aristolochic acid Idecreases expression1
3-((6-(2-methoxyphenyl)pyrimidin-4-yl)amino)phenyl)methane sulfonamidedecreases expression1
testosterone enanthateaffects expression1
methylmercuric chloridedecreases expression1
triphenyl phosphateaffects expression1
alpha-pineneaffects cotreatment, decreases expression, increases abundance1
bisphenol Adecreases methylation1
2-methyl-4-isothiazolin-3-oneincreases expression1
tris(2-butoxyethyl) phosphateaffects expression1
sodium arseniteincreases expression, affects cotreatment, increases abundance1
butyraldehydedecreases expression1
manganese chlorideaffects cotreatment, increases abundance, increases expression1
CGP 52608affects binding, increases reaction1
4-(5-benzo(1,3)dioxol-5-yl-4-pyridin-2-yl-1H-imidazol-2-yl)benzamideaffects cotreatment, decreases expression1
abrinedecreases expression1
dorsomorphindecreases expression, affects cotreatment1
bisphenol Sdecreases methylation1
jinfukangdecreases expression1
incobotulinumtoxinAdecreases expression1
Sunitinibdecreases 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.