GO:0017162 obsolete aryl hydrocarbon receptor binding

GO:0017162, obsolete aryl hydrocarbon receptor binding, is a retired molecular function term in the Gene Ontology that was previously used to annotate proteins capable of binding to an aryl hydrocarbon receptor (AhR). The term belongs to the molecular_function aspect and carried the definition 'Binding to an aryl hydrocarbon receptor,' but it is no longer recommended for annotation because the concept is better represented by more general and stable GO terms. Understanding this obsolete term is useful for researchers who encounter legacy annotations, older datasets, or literature that predates the ontology revision, and who need to map those annotations to current vocabularies. The aryl hydrocarbon receptor is a ligand-activated transcription factor that responds to a wide range of environmental and endogenous chemicals, and its binding interactions are a major focus in toxicology, pharmacology, and drug safety assessment. Computational and in silico approaches frequently attempt to predict whether a compound will bind AhR as part of toxicity screening, which explains why the biological concept behind GO:0017162 remains practically relevant even though the term itself is obsolete. For modern research, the key message is that AhR-binding claims should be supported by experimental evidence and annotated with current GO terms rather than the retired identifier. This article explains what GO:0017162 originally meant, why it was obsoleted, which genes and proteins are involved in AhR biology, and how CRISPR-based models and functional genomics methods can be used to study AhR-binding mechanisms rigorously.

In simple terms, GO:0017162 was a label for 'binding to an aryl hydrocarbon receptor.' The QuickGO definition states: OBSOLETE. Binding to an aryl hydrocarbon receptor. This means the term described a molecular function in which a protein or other molecule physically interacts with an aryl hydrocarbon receptor. Because the ontology curators determined that this concept is not a distinct, well-defined molecular function, the term was marked obsolete and should not be used for new annotations. Researchers should instead use appropriate parent terms such as protein binding or signaling receptor binding, depending on the specific interaction being described.

Although GO:0017162 is obsolete, the biological process it described, binding to the aryl hydrocarbon receptor, remains highly important because AhR is a central mediator of xenobiotic responses and a key consideration in drug toxicity prediction. In silico toxicology models often include AhR binding as an endpoint, and accurate interpretation of legacy annotations is essential for computational biologists and toxicologists who work with historical datasets. Understanding why the term was retired also helps researchers choose correct current GO terms and design experiments that directly test AhR-binding hypotheses.

The following genes and proteins are relevant to aryl hydrocarbon receptor biology and to the interpretation of the obsolete GO:0017162 term, based on published literature.

The aryl hydrocarbon receptor pathway is regulated at multiple levels, including ligand availability, chaperone-mediated stabilization, and feedback repression. In silico models of drug toxicity often incorporate AhR binding as a regulated endpoint, reflecting the pathway's sensitivity to chemical exposure. Because GO:0017162 is obsolete, modern studies should describe AhR regulation using current GO terms and experimental evidence.

AhR binding is a key consideration in predictive toxicology because activation of AhR by xenobiotics can lead to adverse effects. In silico models attempt to predict drug toxicity by evaluating AhR binding, but these predictions must be validated experimentally. The obsolete GO term GO:0017162 may appear in legacy datasets used for such modeling, so researchers should map it to current terms.

AhR signaling has been implicated in cancer biology, where it can influence cell proliferation, differentiation, and survival. Binding interactions with AhR are therefore of interest for understanding tumor-promoting or tumor-suppressive mechanisms. CRISPR-based models can help determine whether specific AhR-binding partners are causally involved in cancer phenotypes.

AhR is involved in immune regulation, including effects on inflammatory cytokine expression and immune cell differentiation. Binding to AhR by endogenous or exogenous ligands can modulate these responses. Experimental models that disrupt AhR or its binding partners can clarify the role of these interactions in immune-related diseases.

The obsoletion of GO:0017162 means that older datasets may contain annotations that are no longer valid. Researchers analyzing such data should be aware that 'aryl hydrocarbon receptor binding' annotations may need to be reinterpreted using current GO terms. This is particularly important in computational toxicology, where legacy data are often reused.

Co-immunoprecipitation, pull-down assays, and surface plasmon resonance can directly test whether a protein binds to AhR. These methods provide physical evidence of interaction and can be used to validate computational predictions.

AhR-dependent transcriptional activity can be measured using reporter genes driven by AhR-responsive promoters, such as CYP1A1. These assays link binding events to functional outcomes and are useful for screening compounds.

CRISPR knockout, point mutation, knock-in, and overexpression models allow causal testing of genes involved in AhR binding and signaling. These models can be combined with transcriptomics or proteomics to dissect pathway mechanisms.

Computational approaches predict AhR binding and toxicity, but require experimental validation. Bioinformatics pipelines should map obsolete GO terms like GO:0017162 to current annotations to maintain data quality.

Researchers studying obsolete aryl hydrocarbon receptor binding-related genes often need to determine whether a candidate gene is causally involved in AhR signaling or toxicity. EDITGENE provides CRISPR-based cell model services that enable precise genetic perturbations and functional readouts, helping teams move from computational predictions to experimental validation.

GO:0017162 obsolete aryl hydrocarbon receptor binding is a retired molecular function term that once described binding to the aryl hydrocarbon receptor. Although it is no longer used for annotation, the underlying biology remains important in toxicology, drug safety, cancer, and immunology. Researchers should use current GO terms and experimental validation, including CRISPR-based models, to study AhR interactions rigorously.