GO:0034691 integrin alphaE-beta7 complex

The integrin alphaE-beta7 complex (GO:0034691) is a heterodimeric cell-surface receptor that belongs to the integrin superfamily of adhesion molecules. It is formed by the non-covalent association of an alphaE subunit (encoded by ITGAE) and a beta7 subunit (encoded by ITGB7), and it is catalogued in the Gene Ontology as a cellular component with the synonym Itgae-Itgb7 complex. Because integrins mediate cell-cell and cell-matrix interactions, the alphaE-beta7 complex is of interest to immunologists studying how T cells adhere to and migrate through epithelial tissues. The complex was identified on skin-infiltrating T cells during inflammation in atopic dermatitis, where its expression was linked to the cutaneous lymphocyte-associated antigen (CLA) phenotype. This observation placed alphaE-beta7 in the context of T-cell homing to inflamed skin and mucosal surfaces, making it a relevant target for understanding inflammatory skin diseases. Beyond its adhesive role, the beta7 cytoplasmic tail recruits intracellular proteins such as WAIT-1, a WD repeat protein that specifically binds beta7-integrin tails and may connect the receptor to downstream signaling or cytoskeletal regulation. For researchers, GO:0034691 provides a precise ontological handle for annotating experiments that probe alphaE-beta7 assembly, trafficking, ligand binding, and signaling. Because the complex is a defined molecular entity rather than a single gene product, studies of its function require methods that can resolve heterodimer formation and subunit-specific contributions. This article summarizes the definition, composition, regulation, disease relevance, and experimental strategies for investigating the integrin alphaE-beta7 complex.

According to the Gene Ontology, GO:0034691 (integrin alphaE-beta7 complex) is a cellular component defined as an integrin complex that comprises one alphaE subunit and one beta7 subunit. In other words, it is a specific heterodimeric adhesion receptor in which the alphaE and beta7 polypeptide chains pair to form a functional integrin. The term carries the synonym Itgae-Itgb7 complex, reflecting the gene symbols ITGAE and ITGB7 that encode the two subunits. This definition distinguishes the alphaE-beta7 heterodimer from other integrin complexes that use different alpha or beta subunits.

The integrin alphaE-beta7 complex is important because it represents a defined molecular machine through which T cells adhere to and interact with epithelial tissues, particularly in inflamed skin and mucosa. Its expression on skin-infiltrating T cells in atopic dermatitis links it directly to inflammatory skin disease biology. In addition, the beta7 cytoplasmic tail engages intracellular proteins such as WAIT-1, suggesting that the complex is not merely a passive adhesion receptor but a hub for signal transduction and protein recruitment. Understanding GO:0034691 therefore supports research into immune cell trafficking, tissue-specific inflammation, and potential therapeutic targeting of integrin-mediated adhesion.

The following genes and proteins are directly or functionally associated with the integrin alphaE-beta7 complex (GO:0034691) based on the verified literature.

The integrin alphaE-beta7 complex is regulated at multiple levels, including subunit expression and intracellular protein recruitment. Expression of alphaE-beta7 on skin-infiltrating T cells is associated with inflammatory conditions such as atopic dermatitis, indicating that its surface levels are modulated during immune responses. At the cytoplasmic face, the beta7 tail interacts with WAIT-1, a WD repeat protein, suggesting that protein-protein interactions can regulate the complex's signaling or trafficking behavior. Because WAIT-1 binds specifically to beta7-integrin tails, this interaction may represent a regulatory node that distinguishes alphaE-beta7 from other integrins. Together, these findings indicate that regulation of GO:0034691 involves both transcriptional control of ITGAE and ITGB7 and post-translational recruitment of intracellular partners.

The integrin alphaE-beta7 complex is expressed on skin-infiltrating T cells during inflammation in atopic dermatitis. In this context, its expression was studied alongside cutaneous lymphocyte-associated antigen, a marker of skin-homing T cells. These observations link GO:0034691 to the pathophysiology of inflammatory skin diseases and to mechanisms of T-cell accumulation in lesional skin. Targeting alphaE-beta7-mediated adhesion is therefore of interest for understanding or modulating skin inflammation.

Because beta7-containing integrins are associated with T-cell homing, the alphaE-beta7 complex is relevant to mucosal and epithelial immune surveillance. The expression of alphaE-beta7 on T cells that infiltrate tissues suggests a role in retaining T cells at epithelial barriers. This biology is important for understanding how immune cells are distributed between skin, gut, and other mucosal compartments.

The interaction between the beta7 cytoplasmic tail and WAIT-1 connects the alphaE-beta7 complex to intracellular signaling or scaffolding pathways. Dysregulation of such interactions could in principle alter T-cell behavior, although the verified literature specifically establishes the binding event rather than a disease outcome. This makes the WAIT-1-beta7 axis a candidate for further mechanistic studies in immune cells.

Flow cytometry using antibodies against alphaE-beta7 or its subunits allows researchers to quantify complex expression on T-cell populations. In atopic dermatitis studies, alphaE-beta7 was detected on skin-infiltrating T cells alongside CLA, demonstrating the utility of immunodetection for this complex. Subunit-specific antibodies can help distinguish the alphaE-beta7 heterodimer from other beta7-containing integrins.

The interaction between the beta7 cytoplasmic tail and WAIT-1 was established using protein-binding assays. Researchers can use similar approaches, such as pull-down or yeast two-hybrid assays, to map interactions at the alphaE-beta7 complex. These methods are essential for understanding how the complex recruits intracellular machinery.

CRISPR knockout of ITGAE or ITGB7 provides a direct way to test the requirement for each subunit in complex formation and function. Point mutations in the beta7 cytoplasmic tail can be introduced to dissect WAIT-1 binding sites. These genetic approaches complement antibody-based and biochemical methods.

RNA sequencing and single-cell transcriptomics can reveal co-expression of ITGAE and ITGB7 in T-cell subsets. Such analyses help identify which cell populations express the alphaE-beta7 complex and how expression changes in inflammatory disease. Combining transcriptomics with protein-level detection provides a more complete picture of GO:0034691 biology.

Researchers studying integrin alphaE-beta7 complex-related genes often need to determine whether a candidate gene is causally involved in complex assembly, T-cell adhesion, or inflammatory disease phenotypes. EDITGENE provides CRISPR-based cell model services that enable precise perturbation of ITGAE, ITGB7, and their interacting partners such as WAIT-1.

The integrin alphaE-beta7 complex (GO:0034691) is a defined heterodimeric adhesion receptor composed of alphaE and beta7 subunits, expressed on T cells including skin-infiltrating populations in atopic dermatitis. Its beta7 cytoplasmic tail recruits the WD repeat protein WAIT-1, connecting the complex to intracellular signaling or scaffolding. Together, these features make GO:0034691 a valuable ontological and experimental target for immunology and inflammation research. CRISPR-based knockout, point-mutation, knock-in, and overexpression models provide powerful tools to dissect the causal roles of ITGAE, ITGB7, and their interacting partners. Researchers can combine these genetic approaches with flow cytometry, biochemical interaction assays, and transcriptomics to build a comprehensive understanding of alphaE-beta7 biology.