| HGNC Family | Glycosyltransferases |
| Name | UDP glucuronosyltransferase 1 family, polypeptide A1 |
| Description | 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 preferred substrate of this enzyme is bilirubin, although it also has moderate activity with simple phenols, flavones, and C18 steroids. Mutations in this gene result in Crigler-Najjar syndromes types I and II and in Gilbert syndrome. [provided by RefSeq, Jul 2008] |
| Summary |
{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nUGT1A1 is a critical phase‐II conjugating enzyme that converts lipophilic compounds into water‐soluble metabolites through glucuronidation. In cancer chemotherapy, its most prominent function is the detoxification of SN-38, the active metabolite of irinotecan. By catalyzing SN-38 glucuronidation, UGT1A1 reduces drug bioavailability and toxicity – a property that underlies observations of severe diarrhea and neutropenia in patients receiving irinotecan. Numerous studies have documented that common UGT1A1 polymorphisms (including *28, *6, and other coding or promoter variants) markedly influence enzyme activity, leading to interindividual differences in irinotecan clearance and thus affecting both the occurrence of adverse events as well as the potential for dose escalation in selected patients."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn parallel to its role in drug metabolism, UGT1A1 is indispensable for the conjugation and clearance of endogenous substrates—most notably bilirubin. Reduced UGT1A1 activity resulting from genetic variants such as UGT1A1*28 contributes to conditions like Gilbert’s syndrome and may underlie altered cardiovascular risk profiles and liver function abnormalities. Beyond bilirubin, UGT1A1 also participates in the metabolism of estrogens and other bioactive molecules, while its expression is regulated by xenobiotic receptors and oxidative stress–responsive elements. Collectively, these attributes underscore the enzyme’s dual importance in both xenobiotic detoxification and physiological homeostasis."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "34"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Y Ando, H Saka, M Ando, et al. 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"}, {"type": "b", "children": [{"type": "t", "text": "Sorafenib is an inhibitor of UGT1A1 but is metabolized by UGT1A9: implications of genetic variants on pharmacokinetics and hyperbilirubinemia."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Clin Cancer Res (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1158/1078-0432.CCR-11-2484"}], "href": "https://doi.org/10.1158/1078-0432.CCR-11-2484"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22307138"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22307138"}]}]}]}
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| Synonyms | HUG-BR1, UDPGT 1-1, BILIQTL1 |
| Proteins | UD11_HUMAN |
| NCBI Gene ID | 54658 |
| API | |
| Download Associations | |
| Predicted Functions |
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| Co-expressed Genes |
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| Expression in Tissues and Cell Lines |
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UGT1A1 has 5,516 functional associations with biological entities spanning 8 categories (molecular profile, organism, functional term, phrase or reference, chemical, disease, phenotype or trait, structural feature, cell line, cell type or tissue, gene, protein or microRNA) extracted from 78 datasets.
Click the + buttons to view associations for UGT1A1 from the datasets below.
If available, associations are ranked by standardized value
| Dataset | Summary | |
|---|---|---|
| Achilles Cell Line Gene Essentiality Profiles | cell lines with fitness changed by UGT1A1 gene knockdown relative to other cell lines from the Achilles Cell Line Gene Essentiality Profiles dataset. | |
| Allen Brain Atlas Adult Mouse Brain Tissue Gene Expression Profiles | tissues with high or low expression of UGT1A1 gene relative to other tissues from the Allen Brain Atlas Adult Mouse Brain Tissue Gene Expression Profiles dataset. | |
| CCLE Cell Line Gene CNV Profiles | cell lines with high or low copy number of UGT1A1 gene relative to other cell lines from the CCLE Cell Line Gene CNV Profiles dataset. | |
| ChEA Transcription Factor Binding Site Profiles | transcription factor binding site profiles with transcription factor binding evidence at the promoter of UGT1A1 gene from the CHEA Transcription Factor Binding Site Profiles dataset. | |
| ChEA Transcription Factor Targets | transcription factors binding the promoter of UGT1A1 gene in low- or high-throughput transcription factor functional studies from the CHEA Transcription Factor Targets dataset. | |
| COMPARTMENTS Curated Protein Localization Evidence Scores | cellular components containing UGT1A1 protein from the COMPARTMENTS Curated Protein Localization Evidence Scores dataset. | |
| COMPARTMENTS Curated Protein Localization Evidence Scores 2025 | cellular components containing UGT1A1 protein from the COMPARTMENTS Curated Protein Localization Evidence Scores 2025 dataset. | |
| COMPARTMENTS Text-mining Protein Localization Evidence Scores | cellular components co-occuring with UGT1A1 protein in abstracts of biomedical publications from the COMPARTMENTS Text-mining Protein Localization Evidence Scores dataset. | |
| COMPARTMENTS Text-mining Protein Localization Evidence Scores 2025 | cellular components co-occuring with UGT1A1 protein in abstracts of biomedical publications from the COMPARTMENTS Text-mining Protein Localization Evidence Scores 2025 dataset. | |
| COSMIC Cell Line Gene Mutation Profiles | cell lines with UGT1A1 gene mutations from the COSMIC Cell Line Gene Mutation Profiles dataset. | |
| CTD Gene-Chemical Interactions | chemicals interacting with UGT1A1 gene/protein from the curated CTD Gene-Chemical Interactions dataset. | |
| CTD Gene-Disease Associations | diseases associated with UGT1A1 gene/protein from the curated CTD Gene-Disease Associations dataset. | |
| dbGAP Gene-Trait Associations | traits associated with UGT1A1 gene in GWAS and other genetic association datasets from the dbGAP Gene-Trait Associations dataset. | |
| DepMap CRISPR Gene Dependency | cell lines with fitness changed by UGT1A1 gene knockdown relative to other cell lines from the DepMap CRISPR Gene Dependency dataset. | |
| DISEASES Curated Gene-Disease Association Evidence Scores | diseases involving UGT1A1 gene from the DISEASES Curated Gene-Disease Assocation Evidence Scores dataset. | |
| DISEASES Curated Gene-Disease Association Evidence Scores 2025 | diseases involving UGT1A1 gene from the DISEASES Curated Gene-Disease Association Evidence Scores 2025 dataset. | |
| DISEASES Experimental Gene-Disease Association Evidence Scores 2025 | diseases associated with UGT1A1 gene in GWAS datasets from the DISEASES Experimental Gene-Disease Assocation Evidence Scores 2025 dataset. | |
| DISEASES Text-mining Gene-Disease Association Evidence Scores | diseases co-occuring with UGT1A1 gene in abstracts of biomedical publications from the DISEASES Text-mining Gene-Disease Assocation Evidence Scores dataset. | |
| DISEASES Text-mining Gene-Disease Association Evidence Scores 2025 | diseases co-occuring with UGT1A1 gene in abstracts of biomedical publications from the DISEASES Text-mining Gene-Disease Assocation Evidence Scores 2025 dataset. | |
| DisGeNET Gene-Disease Associations | diseases associated with UGT1A1 gene in GWAS and other genetic association datasets from the DisGeNET Gene-Disease Associations dataset. | |
| DisGeNET Gene-Phenotype Associations | phenotypes associated with UGT1A1 gene in GWAS and other genetic association datasets from the DisGeNET Gene-Phenoptype Associations dataset. | |
| DrugBank Drug Targets | interacting drugs for UGT1A1 protein from the curated DrugBank Drug Targets dataset. | |
| ENCODE Histone Modification Site Profiles | histone modification site profiles with high histone modification abundance at UGT1A1 gene from the ENCODE Histone Modification Site Profiles dataset. | |
| ENCODE Transcription Factor Binding Site Profiles | transcription factor binding site profiles with transcription factor binding evidence at the promoter of UGT1A1 gene from the ENCODE Transcription Factor Binding Site Profiles dataset. | |
| ENCODE Transcription Factor Targets | transcription factors binding the promoter of UGT1A1 gene in ChIP-seq datasets from the ENCODE Transcription Factor Targets dataset. | |
| ESCAPE Omics Signatures of Genes and Proteins for Stem Cells | PubMedIDs of publications reporting gene signatures containing UGT1A1 from the ESCAPE Omics Signatures of Genes and Proteins for Stem Cells dataset. | |
| GAD Gene-Disease Associations | diseases associated with UGT1A1 gene in GWAS and other genetic association datasets from the GAD Gene-Disease Associations dataset. | |
| GAD High Level Gene-Disease Associations | diseases associated with UGT1A1 gene in GWAS and other genetic association datasets from the GAD High Level Gene-Disease Associations dataset. | |
| GeneRIF Biological Term Annotations | biological terms co-occuring with UGT1A1 gene in literature-supported statements describing functions of genes from the GeneRIF Biological Term Annotations dataset. | |
| GeneSigDB Published Gene Signatures | PubMedIDs of publications reporting gene signatures containing UGT1A1 from the GeneSigDB Published Gene Signatures dataset. | |
| GEO Signatures of Differentially Expressed Genes for Diseases | disease perturbations changing expression of UGT1A1 gene from the GEO Signatures of Differentially Expressed Genes for Diseases dataset. | |
| GEO Signatures of Differentially Expressed Genes for Kinase Perturbations | kinase perturbations changing expression of UGT1A1 gene from the GEO Signatures of Differentially Expressed Genes for Kinase Perturbations dataset. | |
| GEO Signatures of Differentially Expressed Genes for Small Molecules | small molecule perturbations changing expression of UGT1A1 gene from the GEO Signatures of Differentially Expressed Genes for Small Molecules dataset. | |
| GEO Signatures of Differentially Expressed Genes for Transcription Factor Perturbations | transcription factor perturbations changing expression of UGT1A1 gene from the GEO Signatures of Differentially Expressed Genes for Transcription Factor Perturbations dataset. | |
| GEO Signatures of Differentially Expressed Genes for Viral Infections | virus perturbations changing expression of UGT1A1 gene from the GEO Signatures of Differentially Expressed Genes for Viral Infections dataset. | |
| GO Biological Process Annotations 2015 | biological processes involving UGT1A1 gene from the curated GO Biological Process Annotations 2015 dataset. | |
| GO Biological Process Annotations 2025 | biological processes involving UGT1A1 gene from the curated GO Biological Process Annotations2025 dataset. | |
| GO Cellular Component Annotations 2015 | cellular components containing UGT1A1 protein from the curated GO Cellular Component Annotations 2015 dataset. | |
| GO Cellular Component Annotations 2025 | cellular components containing UGT1A1 protein from the curated GO Cellular Component Annotations 2025 dataset. | |
| GO Molecular Function Annotations 2015 | molecular functions performed by UGT1A1 gene from the curated GO Molecular Function Annotations 2015 dataset. | |
| GO Molecular Function Annotations 2025 | molecular functions performed by UGT1A1 gene from the curated GO Molecular Function Annotations 2025 dataset. | |
| GTEx Tissue Gene Expression Profiles | tissues with high or low expression of UGT1A1 gene relative to other tissues from the GTEx Tissue Gene Expression Profiles dataset. | |
| GWASdb SNP-Disease Associations | diseases associated with UGT1A1 gene in GWAS and other genetic association datasets from the GWASdb SNP-Disease Associations dataset. | |
| GWASdb SNP-Phenotype Associations | phenotypes associated with UGT1A1 gene in GWAS datasets from the GWASdb SNP-Phenotype Associations dataset. | |
| Heiser et al., PNAS, 2011 Cell Line Gene Expression Profiles | cell lines with high or low expression of UGT1A1 gene relative to other cell lines from the Heiser et al., PNAS, 2011 Cell Line Gene Expression Profiles dataset. | |
| HMDB Metabolites of Enzymes | interacting metabolites for UGT1A1 protein from the curated HMDB Metabolites of Enzymes dataset. | |
| HPA Cell Line Gene Expression Profiles | cell lines with high or low expression of UGT1A1 gene relative to other cell lines from the HPA Cell Line Gene Expression Profiles dataset. | |
| HPA Tissue Gene Expression Profiles | tissues with high or low expression of UGT1A1 gene relative to other tissues from the HPA Tissue Gene Expression Profiles dataset. | |
| HPO Gene-Disease Associations | phenotypes associated with UGT1A1 gene by mapping known disease genes to disease phenotypes from the HPO Gene-Disease Associations dataset. | |
| Hub Proteins Protein-Protein Interactions | interacting hub proteins for UGT1A1 from the curated Hub Proteins Protein-Protein Interactions dataset. | |
| HuGE Navigator Gene-Phenotype Associations | phenotypes associated with UGT1A1 gene by text-mining GWAS publications from the HuGE Navigator Gene-Phenotype Associations dataset. | |
| InterPro Predicted Protein Domain Annotations | protein domains predicted for UGT1A1 protein from the InterPro Predicted Protein Domain Annotations dataset. | |
| JASPAR Predicted Transcription Factor Targets | transcription factors regulating expression of UGT1A1 gene predicted using known transcription factor binding site motifs from the JASPAR Predicted Transcription Factor Targets dataset. | |
| KEGG Pathways | pathways involving UGT1A1 protein from the KEGG Pathways dataset. | |
| Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene CNV Profiles | cell lines with high or low copy number of UGT1A1 gene relative to other cell lines from the Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene CNV Profiles dataset. | |
| Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene Mutation Profiles | cell lines with UGT1A1 gene mutations from the Klijn et al., Nat. Biotechnol., 2015 Cell Line Gene Mutation Profiles dataset. | |
| KnockTF Gene Expression Profiles with Transcription Factor Perturbations | transcription factor perturbations changing expression of UGT1A1 gene from the KnockTF Gene Expression Profiles with Transcription Factor Perturbations dataset. | |
| LOCATE Curated Protein Localization Annotations | cellular components containing UGT1A1 protein in low- or high-throughput protein localization assays from the LOCATE Curated Protein Localization Annotations dataset. | |
| MotifMap Predicted Transcription Factor Targets | transcription factors regulating expression of UGT1A1 gene predicted using known transcription factor binding site motifs from the MotifMap Predicted Transcription Factor Targets dataset. | |
| OMIM Gene-Disease Associations | phenotypes associated with UGT1A1 gene from the curated OMIM Gene-Disease Associations dataset. | |
| Pathway Commons Protein-Protein Interactions | interacting proteins for UGT1A1 from the Pathway Commons Protein-Protein Interactions dataset. | |
| PFOCR Pathway Figure Associations 2024 | pathways involving UGT1A1 protein from the Wikipathways PFOCR 2024 dataset. | |
| Reactome Pathways 2014 | pathways involving UGT1A1 protein from the Reactome Pathways dataset. | |
| Reactome Pathways 2024 | pathways involving UGT1A1 protein from the Reactome Pathways 2024 dataset. | |
| Roadmap Epigenomics Cell and Tissue DNA Methylation Profiles | cell types and tissues with high or low DNA methylation of UGT1A1 gene relative to other cell types and tissues from the Roadmap Epigenomics Cell and Tissue DNA Methylation Profiles dataset. | |
| Roadmap Epigenomics Histone Modification Site Profiles | histone modification site profiles with high histone modification abundance at UGT1A1 gene from the Roadmap Epigenomics Histone Modification Site Profiles dataset. | |
| RummaGEO Drug Perturbation Signatures | drug perturbations changing expression of UGT1A1 gene from the RummaGEO Drug Perturbation Signatures dataset. | |
| RummaGEO Gene Perturbation Signatures | gene perturbations changing expression of UGT1A1 gene from the RummaGEO Gene Perturbation Signatures dataset. | |
| TargetScan Predicted Conserved microRNA Targets | microRNAs regulating expression of UGT1A1 gene predicted using conserved miRNA seed sequences from the TargetScan Predicted Conserved microRNA Targets dataset. | |
| TargetScan Predicted Nonconserved microRNA Targets | microRNAs regulating expression of UGT1A1 gene predicted using nonconserved miRNA seed sequences from the TargetScan Predicted Nonconserved microRNA Targets dataset. | |
| TCGA Signatures of Differentially Expressed Genes for Tumors | tissue samples with high or low expression of UGT1A1 gene relative to other tissue samples from the TCGA Signatures of Differentially Expressed Genes for Tumors dataset. | |
| TISSUES Curated Tissue Protein Expression Evidence Scores | tissues with high expression of UGT1A1 protein from the TISSUES Curated Tissue Protein Expression Evidence Scores dataset. | |
| TISSUES Curated Tissue Protein Expression Evidence Scores 2025 | tissues with high expression of UGT1A1 protein from the TISSUES Curated Tissue Protein Expression Evidence Scores 2025 dataset. | |
| TISSUES Experimental Tissue Protein Expression Evidence Scores | tissues with high expression of UGT1A1 protein in proteomics datasets from the TISSUES Experimental Tissue Protein Expression Evidence Scores dataset. | |
| TISSUES Text-mining Tissue Protein Expression Evidence Scores | tissues co-occuring with UGT1A1 protein in abstracts of biomedical publications from the TISSUES Text-mining Tissue Protein Expression Evidence Scores dataset. | |
| TISSUES Text-mining Tissue Protein Expression Evidence Scores 2025 | tissues co-occuring with UGT1A1 protein in abstracts of biomedical publications from the TISSUES Text-mining Tissue Protein Expression Evidence Scores 2025 dataset. | |
| WikiPathways Pathways 2014 | pathways involving UGT1A1 protein from the Wikipathways Pathways 2014 dataset. | |
| WikiPathways Pathways 2024 | pathways involving UGT1A1 protein from the WikiPathways Pathways 2024 dataset. | |
