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UGT1A8 UDP glucuronosyltransferase family 1 member A8 [ Homo sapiens (human) ]

Gene ID: 54576, updated on 25-Nov-2025
Official Symbol
UGT1A8provided by HGNC
Official Full Name
UDP glucuronosyltransferase family 1 member A8provided by HGNC
Primary source
HGNC:HGNC:12540
See related
Ensembl:ENSG00000242366 MIM:606433; AllianceGenome:HGNC:12540
Gene type
protein coding
RefSeq status
REVIEWED
Organism
Homo sapiens
Lineage
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo
Also known as
GNT1; UGT1; UDPGT; UGT1A; UGT1H; UGT-1A; UGT-1H; UGT1.1; UGT1.8; UGT1A1; UGT1-01; UGT1-08; UGT1A8S; hUG-BR1; UDPGT 1-1; UDPGT 1-8
Summary
This gene encodes a UDP-glucuronosyltransferase, an enzyme of the glucuronidation pathway that transforms small lipophilic molecules, such as steroids, bilirubin, hormones, and drugs, into water-soluble, excretable metabolites. This gene is part of a complex locus that encodes several UDP-glucuronosyltransferases. The locus includes thirteen unique alternate first exons followed by four common exons. Four of the alternate first exons are considered pseudogenes. Each of the remaining nine 5' exons may be spliced to the four common exons, resulting in nine proteins with different N-termini and identical C-termini. Each first exon encodes the substrate binding site, and is regulated by its own promoter. The enzyme encoded by this gene has glucuronidase activity with many substrates including coumarins, phenols, anthraquinones, flavones, and some opioids. [provided by RefSeq, Jul 2008]
Orthologs
all
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See UGT1A8 in Genome Data Viewer
Location:
2q37.1
Exon count:
5
Annotation release Status Assembly Chr Location
RS_2025_08 current GRCh38.p14 (GCF_000001405.40) 2 NC_000002.12 (233617633..233773300)
RS_2025_08 current T2T-CHM13v2.0 (GCF_009914755.1) 2 NC_060926.1 (234106275..234261929)
RS_2024_09 previous assembly GRCh37.p13 (GCF_000001405.25) 2 NC_000002.11 (234526279..234681946)

Chromosome 2 - NC_000002.12Genomic Context describing neighboring genes Neighboring gene ATAC-STARR-seq lymphoblastoid active region 17350 Neighboring gene UDP glucuronosyltransferase family 1 member A12, pseudogene Neighboring gene UDP glucuronosyltransferase family 1 member A complex locus Neighboring gene UDP glucuronosyltransferase family 1 member A11, pseudogene Neighboring gene UDP glucuronosyltransferase family 1 member A10 Neighboring gene UDP glucuronosyltransferase family 1 member A13, pseudogene Neighboring gene NANOG-H3K4me1 hESC enhancer GRCh37_chr2:234599674-234600281 Neighboring gene NANOG-H3K4me1 hESC enhancer GRCh37_chr2:234600282-234600888 Neighboring gene UDP glucuronosyltransferase family 1 member A9 Neighboring gene UDP glucuronosyltransferase family 1 member A7 Neighboring gene H3K4me1 hESC enhancer GRCh37_chr2:234621256-234621756 Neighboring gene H3K4me1 hESC enhancer GRCh37_chr2:234621757-234622257 Neighboring gene UDP glucuronosyltransferase family 1 member A6 Neighboring gene UDP glucuronosyltransferase family 1 member A5 Neighboring gene ribosomal protein L17 pseudogene 11 Neighboring gene UDP glucuronosyltransferase family 1 member A4 Neighboring gene UDP glucuronosyltransferase family 1 member A3 Neighboring gene DnaJ heat shock protein family (Hsp40) member B3 pseudogene Neighboring gene ReSE screen-validated silencer GRCh37_chr2:234668353-234668527 Neighboring gene DnaJ heat shock protein family (Hsp40) member B3 Neighboring gene UDP glucuronosyltransferase family 1 member A2, pseudogene Neighboring gene UDP glucuronosyltransferase family 1 member A1 Neighboring gene maestro heat like repeat family member 2A Neighboring gene H3K4me1 hESC enhancer GRCh37_chr2:234731477-234731977 Neighboring gene H3K4me1 hESC enhancer GRCh37_chr2:234759038-234759538 Neighboring gene H3K27ac hESC enhancer GRCh37_chr2:234763063-234764055 Neighboring gene Holliday junction recognition protein

Go to nucleotide: Graphics FASTA GenBank

  • Project title: Tissue-specific circular RNA induction during human fetal development
  • Description: 35 human fetal samples from 6 tissues (3 - 7 replicates per tissue) collected between 10 and 20 weeks gestational time were sequenced using Illumina TruSeq Stranded Total RNA
  • BioProject: PRJNA270632
  • Publication: PMID 26076956
  • Analysis date: Mon Apr 2 22:54:59 2018

Related articles in PubMed

  1. In Vitro Study on Influences of UGT1A8 Gene Polymorphisms on Mycophenolate Mofetil Metabolism. Zhou Z, et al. Exp Clin Transplant, 2018 Aug. PMID 29025387
  2. Species- and gender-dependent differences in the glucuronidation of a flavonoid glucoside and its aglycone determined using expressed UGT enzymes and microsomes. Dai P, et al. Biopharm Drug Dispos, 2015 Dec. PMID 26317684
  3. Human UDP-glucuronosyltransferase, UGT1A8, glucuronidates dihydrotestosterone to a monoglucuronide and further to a structurally novel diglucuronide. Murai T, et al. Drug Metab Dispos, 2006 Jul. PMID 16595710
  4. Glucuronidation of anabolic androgenic steroids by recombinant human UDP-glucuronosyltransferases. Kuuranne T, et al. Drug Metab Dispos, 2003 Sep. PMID 12920167
  5. Cloning and expression of human UDP-glucuronosyltransferase (UGT) 1A8. Cheng Z, et al. Arch Biochem Biophys, 1998 Aug 15. PMID 9705221

See all (79) citations in PubMed

GeneRIFs: Gene References Into Functions

What's a GeneRIF?
  1. The function of uterine UDP-glucuronosyltransferase 1A8 (UGT1A8) and UDP-glucuronosyltransferase 2B7 (UGT2B7) is involved in endometrial cancer based on estrogen metabolism regulation.
    Title: The function of uterine UDP-glucuronosyltransferase 1A8 (UGT1A8) and UDP-glucuronosyltransferase 2B7 (UGT2B7) is involved in endometrial cancer based on estrogen metabolism regulation.
  2. studies lead to a model for the developmental patterning of UGT1A8, UGT1A9, and UGT1A10 in hepatic and/or extrahepatic tissues involving discrete regulatory modules that may function (independently and cooperatively) in a context-dependent manner
    Title: Cooperative Regulation of Intestinal UDP-Glucuronosyltransferases 1A8, -1A9, and 1A10 by CDX2 and HNF4α Is Mediated by a Novel Composite Regulatory Element.
  3. UGT1A8 gene polymorphisms can affect the activity of UDP glucuronosyltransferase enzyme, which may influence the elimination of mycophenolate mofetil in different patients.
    Title: In Vitro Study on Influences of UGT1A8 Gene Polymorphisms on Mycophenolate Mofetil Metabolism.
  4. Polymorphism of UGT1A8 rs1042597-G variant allele is associated with colorectal cancer.
    Title: Common variants in glucuronidation enzymes and membrane transporters as potential risk factors for colorectal cancer: a case control study.
  5. the in vitro glucuronidation of raloxifene in humans and monkeys was examined using liver and intestinal microsomes and recombinant UGT enzymes (UGT1A1, UGT1A8 and UGT1A9).
    Title: Raloxifene glucuronidation in liver and intestinal microsomes of humans and monkeys: contribution of UGT1A1, UGT1A8 and UGT1A9.
  6. Data suggest UGT1A8 is involved in differential metabolism of dietary flavonoids (glucosides and aglycones); glucuronidation of flavonoid glucosides is considerably slower than glucuronidation of flavonoid aglycones in microsomes of intestine/liver.
    Title: Species- and gender-dependent differences in the glucuronidation of a flavonoid glucoside and its aglycone determined using expressed UGT enzymes and microsomes.
  7. Genetic polymorphisms of UGT1A8, UGT1A9 and HNF-1alpha and gastrointestinal symptoms in renal transplant recipients taking mycophenolic acid.
    Title: Genetic polymorphisms of UGT1A8, UGT1A9 and HNF-1α and gastrointestinal symptoms in renal transplant recipients taking mycophenolic acid.
  8. UGT1A8 Polymorphism is associated with response to raloxifene in breast cancer.
    Title: Characterization of raloxifene glucuronidation: potential role of UGT1A8 genotype on raloxifene metabolism in vivo.
  9. A much higher frequency of UGT1A8*2 variant allele was found in Chinese than in Caucasians and Africans
    Title: Genetic polymorphisms of UGT1A8, UGT1A9, UGT2B7 and ABCC2 in Chinese renal transplant recipients and a comparison with other ethnic populations.
  10. The UGT1A8 and UGT2B4 genotypes associated with decreased predicted enzyme activities, were significantly associated with an increased risk of esophageal squamous cell carcinoma.
    Title: High enzyme activity UGT1A1 or low activity UGT1A8 and UGT2B4 genotypes increase esophageal cancer risk.
Submit: New GeneRIF Correction See all GeneRIFs (22)

Find tests for this gene in the NIH Genetic Testing Registry (GTR)

Review eQTL and phenotype association data in this region using PheGenI

EBI GWAS Catalog

Description
A genome-wide assessment of variability in human serum metabolism.
EBI GWAS Catalog
A genome-wide association study for serum bilirubin levels and gene-environment interaction in a Chinese population.
EBI GWAS Catalog
A genome-wide association study identifies UGT1A1 as a regulator of serum cell-free DNA in young adults: The Cardiovascular Risk in Young Finns Study.
EBI GWAS Catalog
A genome-wide association study of total bilirubin and cholelithiasis risk in sickle cell anemia.
EBI GWAS Catalog
A multi-stage genome-wide association study of bladder cancer identifies multiple susceptibility loci.
EBI GWAS Catalog
An atlas of genetic influences on human blood metabolites.
EBI GWAS Catalog
Association of SNPs in the UGT1A gene cluster with total bilirubin and mortality in the Diabetes Heart Study.
EBI GWAS Catalog
Common variants in the SLCO1B3 locus are associated with bilirubin levels and unconjugated hyperbilirubinemia.
EBI GWAS Catalog
Discovery and refinement of loci associated with lipid levels.
EBI GWAS Catalog
Family-based genome-wide association scan of attention-deficit/hyperactivity disorder.
EBI GWAS Catalog
Genetic determinants influencing human serum metabolome among African Americans.
EBI GWAS Catalog
Genome-wide analysis of hepatic lipid content in extreme obesity.
EBI GWAS Catalog
Genome-wide association meta-analysis for total serum bilirubin levels.
EBI GWAS Catalog
Genome-wide association of serum bilirubin levels in Korean population.
EBI GWAS Catalog
Genome-wide association study identifies multiple loci associated with bladder cancer risk.
EBI GWAS Catalog
Human metabolic individuality in biomedical and pharmaceutical research.
EBI GWAS Catalog
Mayo Genome Consortia: a genotype-phenotype resource for genome-wide association studies with an application to the analysis of circulating bilirubin levels.
EBI GWAS Catalog
UGT1A1 is a major locus influencing bilirubin levels in African Americans.
EBI GWAS Catalog

See variants in ClinVar

See studies and variants in dbVar

See Variation Viewer (GRCh37.p13)

See Variation Viewer (GRCh38)

Products Interactant Other Gene Complex Source Pubs Description

Markers

Homology

Gene Ontology Provided by GOA

Function Evidence Code Pubs
enables UDP-glycosyltransferase activity IBA
Inferred from Biological aspect of Ancestor
more info
  
enables UDP-glycosyltransferase activity IEA
Inferred from Electronic Annotation
more info
  
enables enzyme binding IBA
Inferred from Biological aspect of Ancestor
more info
  
enables enzyme binding IEA
Inferred from Electronic Annotation
more info
  
enables enzyme binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables enzyme inhibitor activity IBA
Inferred from Biological aspect of Ancestor
more info
  
enables enzyme inhibitor activity IDA
Inferred from Direct Assay
more info
 PubMed 
enables fatty acid binding IDA
Inferred from Direct Assay
more info
 PubMed 
enables glucuronosyltransferase activity IDA
Inferred from Direct Assay
more info
 PubMed 
enables glucuronosyltransferase activity IEA
Inferred from Electronic Annotation
more info
  
NOT enables glucuronosyltransferase activity IGI
Inferred from Genetic Interaction
more info
 PubMed 
enables glycosyltransferase activity IEA
Inferred from Electronic Annotation
more info
  
enables protein binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables protein heterodimerization activity IEA
Inferred from Electronic Annotation
more info
  
enables protein heterodimerization activity IPI
Inferred from Physical Interaction
more info
 PubMed 
enables protein homodimerization activity IDA
Inferred from Direct Assay
more info
 PubMed 
enables protein homodimerization activity IEA
Inferred from Electronic Annotation
more info
  
enables retinoic acid binding IC
Inferred by Curator
more info
 PubMed 
enables steroid binding IDA
Inferred from Direct Assay
more info
 PubMed 
enables transferase activity IEA
Inferred from Electronic Annotation
more info
  
Process Evidence Code Pubs
involved_in cellular response to glucocorticoid stimulus IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in coumarin metabolic process IC
Inferred by Curator
more info
 PubMed 
involved_in estrogen metabolic process IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in fatty acid metabolic process IC
Inferred by Curator
more info
 PubMed 
involved_in fatty acid metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in flavone metabolic process IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in flavone metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in flavonoid metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in lipid metabolic process IEA
Inferred from Electronic Annotation
more info
  
involved_in liver development IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in negative regulation of fatty acid metabolic process IC
Inferred by Curator
more info
 PubMed 
involved_in negative regulation of fatty acid metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in negative regulation of steroid metabolic process IC
Inferred by Curator
more info
 PubMed 
involved_in retinoic acid metabolic process IC
Inferred by Curator
more info
 PubMed 
involved_in steroid metabolic process IC
Inferred by Curator
more info
 PubMed 
involved_in steroid metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in sterol metabolic process IBA
Inferred from Biological aspect of Ancestor
more info
  
NOT involved_in xenobiotic metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in xenobiotic metabolic process IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in xenobiotic metabolic process IEA
Inferred from Electronic Annotation
more info
  
Component Evidence Code Pubs
is_active_in endoplasmic reticulum IBA
Inferred from Biological aspect of Ancestor
more info
  
located_in endoplasmic reticulum IDA
Inferred from Direct Assay
more info
 PubMed 
located_in endoplasmic reticulum IEA
Inferred from Electronic Annotation
more info
  
located_in endoplasmic reticulum NAS
Non-traceable Author Statement
more info
 PubMed 
located_in endoplasmic reticulum membrane IEA
Inferred from Electronic Annotation
more info
  
NOT located_in endoplasmic reticulum membrane IKR
Inferred from Key Residues
more info
 PubMed 
located_in endoplasmic reticulum membrane NAS
Non-traceable Author Statement
more info
 PubMed 
Preferred Names
UDP-glucuronosyltransferase 1A8
Names
Bilirubin-specific UDPGT isozyme 1
UDP glucuronosyltransferase 1 family, polypeptide A8
UDP glycosyltransferase 1 family, polypeptide A8
UDP-glucuronosyltransferase 1 family polypeptide A8s
UDP-glucuronosyltransferase 1-1
UDP-glucuronosyltransferase 1-8
UDP-glucuronosyltransferase 1-A
UDP-glucuronosyltransferase 1-H
UDP-glucuronosyltransferase 1A1
NP_061949.3

NEW Try the new Transcript table

RefSeqs maintained independently of Annotated Genomes

These reference sequences exist independently of genome builds. Explain

These reference sequences are curated independently of the genome annotation cycle, so their versions may not match the RefSeq versions in the current genome build. Identify version mismatches by comparing the version of the RefSeq in this section to the one reported in Genomic regions, transcripts, and products above.

Genomic

  1. NG_002601.2 RefSeqGene

    Range
    32902..188556
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. NM_019076.5 → NP_061949.3  UDP-glucuronosyltransferase 1A8 precursor

    See identical proteins and their annotated locations for NP_061949.3

    Status: REVIEWED

    Source sequence(s)
    AC006985, AC019072
    Consensus CDS
    CCDS33402.1
    UniProtKB/Swiss-Prot
    B2R8S3, B8K290, O14928, Q8TEX4, Q8WTQ9, Q8WX85, Q9HAW9
    UniProtKB/TrEMBL
    Q5DSZ6
    Related
    ENSP00000362549.4, ENST00000373450.5
    Conserved Domains (1) summary
    pfam00201
    Location:26 → 521
    UDPGT; UDP-glucoronosyl and UDP-glucosyl transferase

RefSeqs of Annotated Genomes: GCF_000001405.40-RS_2025_08

The following sections contain reference sequences that belong to a specific genome build. Explain

Reference GRCh38.p14 Primary Assembly

Genomic

  1. NC_000002.12 Reference GRCh38.p14 Primary Assembly

    Range
    233617633..233773300
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

Alternate T2T-CHM13v2.0

Genomic

  1. NC_060926.1 Alternate T2T-CHM13v2.0

    Range
    234106275..234261929
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)
Nucleotide Protein
Heading Accession and Version
Protein Accession Links
GenPept Link UniProtKB Link
Q9HAW9.1 GenPept UniProtKB/Swiss-Prot:Q9HAW9

Gene LinkOut

The following LinkOut resources are supplied by external providers. These providers are responsible for maintaining the links.

Chemical Information
Molecular Biology Databases
Research Materials
Miscellaneous