GDA
Guanine deaminase
Also known as: CYPIN, GAH, GUAD_HUMAN
Cross-references: UniProt · Ensembl · Human Protein Atlas · GeneCards · NCBI Gene
Protein identityUniProt · HPA
- UniProt accession
- Q9Y2T3
- Gene
- GDA
- Ensembl
- ENSG00000119125
- Chromosome
- 9
- Canonical length
- 454 aa
- Protein class
- Enzymes, Metabolic proteins, Plasma proteins, Predicted intracellular proteins
- Subcellular location
- Nucleoplasm
- Quaternary structure
- Homodimer
OverviewNCBI Gene
This gene encodes an enzyme responsible for the hydrolytic deamination of guanine. Studies in rat ortholog suggest this gene plays a role in microtubule assembly. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Nov 2011]
Canonical amino-acid sequenceUniProt
454 residues, UniProt reviewed canonical sequence.
>Q9Y2T3|GDA
1 MCAAQMPPLA HIFRGTFVHS TWTCPMEVLR DHLLGVSDSG KIVFLEEASQ QEKLAKEWCF
61 KPCEIRELSH HEFFMPGLVD THIHASQYSF AGSSIDLPLL EWLTKYTFPA EHRFQNIDFA
121 EEVYTRVVRR TLKNGTTTAC YFATIHTDSS LLLADITDKF GQRAFVGKVC MDLNDTFPEY
181 KETTEESIKE TERFVSEMLQ KNYSRVKPIV TPRFSLSCSE TLMGELGNIA KTRDLHIQSH
241 ISENRDEVEA VKNLYPSYKN YTSVYDKNNL LTNKTVMAHG CYLSAEELNV FHERGASIAH
301 CPNSNLSLSS GFLNVLEVLK HEVKIGLGTD VAGGYSYSML DAIRRAVMVS NILLINKVNE
361 KSLTLKEVFR LATLGGSQAL GLDGEIGNFE VGKEFDAILI NPKASDSPID LFYGDFFGDI
421 SEAVIQKFLY LGDDRNIEEV YVGGKQVVPF SSSVLocalizationUniProt · AlphaFold · HPA
Whether an antibody against GDA can act on the native protein depends on physical access: surface and secreted proteins are reachable by circulating antibodies, intracellular proteins usually are not.
- Antibody reachability
- Intracellular
- Secreted
- No
- Transmembrane segments
- 0
- Mean surface accessibility (rSASA)
- 0.2
- Highest tissue expression
- 89 nTPM
Expression across tissuesHPA
Tissue
- small intestine: 89 nTPM
- duodenum: 89 nTPM
- cerebral cortex: 70 nTPM
- liver: 57 nTPM
- basal ganglia: 48 nTPM
- amygdala: 47 nTPM
Single-cell type
- endometrial luminal cells: 2,093 nCPM
- enterocytes: 1,691 nCPM
- endometrial glandular cells: 1,151 nCPM
- endometrial ciliated cells: 906 nCPM
- endometrial secretory cells: 844 nCPM
- proximal tubule cells: 296 nCPM
Immune cell
- basophil: 0.7 nTPM
- naive B-cell: 0.3 nTPM
- neutrophil: 0.3 nTPM
- NK-cell: 0.3 nTPM
- gdT-cell: 0.2 nTPM
- naive CD8 T-cell: 0.2 nTPM
Brain region
- basal ganglia: 100 nTPM
- cerebral cortex: 91 nTPM
- hypothalamus: 87 nTPM
- hippocampal formation: 52 nTPM
- white matter: 51 nTPM
- amygdala: 35 nTPM
ReferencesPubMed · IEDB
Publications for GDA from three distinct lines of evidence, kept separate because they answer different questions: whether antibodies are directed at the protein, whether a B-cell epitope has been mapped on it, and whether a T-cell epitope has. Each is labelled with its source.
Reference: AutoantibodyPubMed
2 publications
- Clinical and genetic characteristics of diabetic patients with high-titer (>10,000 U/ml) of antibodies to glutamic acid decarboxylase.
2005 · Immunol Lett · RCR 0.2 · 7 citations - A Novel IgG-IgM Autoantibody Panel Enhances Detection of Early-stage Lung Adenocarcinoma from Benign Nodules.
2025 · Genomics Proteomics Bioinformatics · 3 citations
Reference: B cellIEDB
1 publication
- Identification of the antigenic epitopes of maternal autoantibodies in autism spectrum disorders.
2018 · Brain Behav Immun · RCR 1.2 · 27 citations
Sources: PubMed — antigen-level antibody evidence from a custom retrieval. Records matching a controlled set of autoantibody terms (the MeSH descriptors Autoantibodies and Autoantigens, with title and abstract term variants) were obtained through NCBI E-utilities, and their titles and abstracts parsed for constructions that direct an antibody at a named protein rather than for co-occurrence. Captured names were resolved against UniProt nomenclature and each antigen adjudicated individually against the source text. IEDB — curated epitope assays from the Immune Epitope Database (Vita et al., Nucleic Acids Research 2019). Bibliographic records from PubMed and MeSH, U.S. National Library of Medicine; citation metrics from NIH iCite (Hutchins et al., PLoS Biology 2016). Titles link to PubMed; abstracts are not reproduced here. The NLM does not endorse this analysis.
Genetic constraint and essentialitygnomAD · DepMap
Does the body need this protein intact? Low LOEUF or a strong DepMap dependency means loss or blockade of the protein is likely to be felt.
- gnomAD LOEUF (loss-of-function intolerance)
- 0.22
- gnomAD pLI
- 1
- gnomAD missense Z
- 1.46
- DepMap mean gene effect
- 0.03
- DepMap dependency class
- none
Cancer expressionTCGA
Across TCGA tumor cohorts, this protein is over-expressed in roughly 4% of surveyed tumor types (aggregate summary; per-cohort expression, alteration, and survival load in the interactive view).
OntologyGO
Biological processes
- allantoin metabolic process
- amide catabolic process
- deoxyguanosine catabolic process
- dGMP catabolic process
- GMP catabolic process
- guanine catabolic process
- guanine metabolic process
- nervous system development
- nucleobase-containing compound metabolic process
Molecular functions
- zinc ion binding
- guanine deaminase activity
Cellular components
Protein domainsUniProt · Pfam · InterPro
- Amidohydrolase-related
- Metal-dependent hydrolase, composite domain superfamily
- Metal-dependent hydrolase
- Amidohydrolase family
- Guanine deaminase
- Metallo-dependent Hydrolases
KeywordsUniProt
InteractionsUniProt · HPA
Protein binding partners of GDA in the human serome: UniProt-annotated complex subunits plus reported interactors. Each links to its own Seroatlas record.
Antibody and autoantibody relevanceSeroatlas analysis
Seroatlas reads GDA as an antibody target. Whether an autoantibody or antibody against GDA could matter depends on whether native GDA is physically reachable, whether the body needs it intact, and whether it acts in a disease-relevant tissue.
GDA is annotated as predominantly intracellular. Intracellular proteins are common autoantibody markers, becoming visible to the immune system after cell injury or altered processing, but are usually markers of disease rather than direct drivers.
Annotation status
The present source text does not explicitly label GDA as an autoantigen. Seroatlas presents hypothesis context only and does not manufacture a known-serology claim.
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