# Insights on SNPs of Human Activation-Induced Cytidine Deaminase AID

## TL;DR

This paper reviews how genetic variations in the AID enzyme affect its function and may contribute to immune disorders and cancer.

## Contribution

The study integrates bioinformatics and experimental data to identify SNPs in AID that may disrupt its function.

## Key findings

- Among 208 SNPs in AID, 62 are predicted to negatively impact its function.
- AID dysregulation is linked to immune disorders and oncogenic mutations.
- The study highlights the role of AID in maintaining immune homeostasis.

## Abstract

DNA-deaminase AID plays a pivotal role in adaptive immunity, antibody diversification and epigenetic regulation. AID catalyzes cytidine deamination in immunoglobulin genes, facilitating somatic hypermutation (SHM), class-switch recombination (CSR) and gene conversion (GC). However, the dysregulation of AID activity can lead to oncogenic mutations and immune disorders such as hyper-IgM syndrome type 2 (HIGM2). At present the number of studies investigating the role of AID polymorphic variants in the promotion of pathology is low. The current review examines the structural and functional aspects of AID, focusing on the impact of amino acid substitutions—both natural polymorphisms and artificial mutations—on its catalytic activity, substrate binding and interactions with regulatory proteins. Additionally, a bioinformatic analysis of single-nucleotide polymorphisms of AID deposited in the dbSNP database was performed. SNPs leading to amino acid substitutions in the primary protein structure were analyzed. The bioinformatic analysis of SNPs in the AID gene predicts that among 208 SNPs causing amino acid substitutions in the primary protein structure, 62 substitutions may have significant negative impact on the functioning of AID. The integration of computational predictions with experimental data underscores the importance of AID regulation in maintaining immune homeostasis and highlights potential markers for immune-related pathologies. This comprehensive analysis provides insights into the molecular mechanisms of AID dysfunction and its implications for disease.