# Bioinformatics Study on Site-Specific Variations of Eotaxin-3, a Key Chemokine in Eosinophilic Esophagitis (EoE)

## TL;DR

This study uses bioinformatics to analyze how genetic variations in Eotaxin-3 affect its structure and function in eosinophilic esophagitis.

## Contribution

A web application was developed to visualize and analyze 3D models of Eotaxin-3 variants and their structural impacts.

## Key findings

- 44 out of 105 amino acid substitutions caused changes in structural parameters.
- Six variations affected highly conserved amino acids, suggesting functional importance despite no structural change.
- The web application allows users to explore and download 3D models of Eotaxin-3 variants.

## Abstract

Eotaxin-3 is a key chemokine with a relevant role in eosinophilic esophagitis, a rare chronic immune/antigen-mediated inflammatory disorder. Eotaxin-3 is a potent activator of eosinophil emergence and migration, which may lead to allergic airway inflammation. We investigated, using bioinformatics tools, the protein structure and the possible effects of the known variations reported in public databases. Following a procedure already established, we created a 3D model of the whole protein and modeled the structure of 105 protein variants due to known point mutations. The effects of the amino acid substitution at the level of impact on protein structure, stability, and possibly function were detected by the bioinformatics procedure and described in detail. A web application was implemented to browse the results of the analysis and visualize the 3D models, with the opportunity of downloading the models and analyzing them using their own software. Among 105 amino acid substitutions investigated, the study evidenced in 44 cases at least one change in any of the investigated structural parameters. Other six variations are also relevant, although a structural effect was not detected by our analysis, because they affected amino acids highly conserved, which suggests a possible function role. All these variations should be the object of particular attention, as they may induce a loss of functionality in the protein.