# Genome-Wide Identification of MicroRNAs and Immune-Related Proteins Provides Insights into Antiviral Adaptations in Common Vampire Bat

## TL;DR

This study explores how common vampire bats tolerate viruses without getting sick by analyzing their genome, immune proteins, and microRNAs.

## Contribution

The study identifies novel miRNAs and immune-related proteins in vampire bats, revealing unique antiviral adaptations.

## Key findings

- Conserved interferon regulators and immune proteins were identified in D. rotundus.
- Nineteen novel miRNAs target genes involved in antiviral defense and stress response.
- Key regulatory hubs like MYC and BCL2 influence immune balance and cell survival.

## Abstract

The common vampire bat (Desmodus rotundus) harbors many viruses but rarely develops disease, suggesting unique immune strategies. In this study, we combined genomic comparison, protein annotation, and microRNA analysis to investigate its antiviral mechanisms. We identified conserved interferon regulators, immune-related proteins, and novel miRNAs targeting genes involved in apoptosis, stress response, and infection pathways. Network analysis further highlighted key hub genes controlling immune balance. Our findings show that D. rotundus relies on finely tuned gene regulation to tolerate viruses without pathology.

Bats are natural reservoirs for diverse viruses, yet they rarely develop disease, suggesting unique antiviral adaptations. In this study, we performed a comprehensive genome-wide analysis in the common vampire bat (Desmodus rotundus), integrating comparative genomics, functional annotation, microRNA (miRNA) discovery, target prediction, and network-based analyses. Comparative genomic analysis revealed that Phyllostomus discolor exhibits the highest protein homology (97.4%) with D. rotundus. Alignment of interferon regulatory factors (IRFs) indicated strong conservation of IRF1, IRF5, and IRF8, while IRF4 and IRF7 showed divergence, reflecting bat-specific modulation of interferon signaling. Functional annotation of previously uncharacterized proteins identified immune-related elements, including toll-like receptor 4, syncytin-1, and endogenous retroviral sequences, highlighting the integration of viral components into host immunity. We further identified 19 novel miRNAs in D. rotundus, with high-confidence target genes such as SOD2, TRIM28, and FGFR1 involved in antiviral defense, apoptosis regulation, and oxidative stress response. Functional enrichment analyses revealed processes associated with wound healing, apoptosis suppression, infection response, and longevity. Network entropy analysis highlighted central regulatory hubs, including MYC, BCL2, and KIF1B, influencing cell cycle, survival, and immune balance. Collectively, these results demonstrate that D. rotundus employs an integrated regulatory network combining conserved immune factors, lineage-specific gene divergence, and miRNA-mediated fine-tuning to achieve viral tolerance without pathology. This study expands our understanding of bat antiviral biology and provides candidate molecular targets for future functional and translational research.