Genomic Insights into Wolbachia Strain wCin2USA1 Reveal Promising Cytoplasmic Incompatibility Potential and Next-Generation Dengue Biocontrol

Abstract

Dengue fever poses a growing public health challenge globally, resulting in significant morbidity and economic burden. The use of Wolbachia-mediated biocontrol represents a promising, cost-effective, and environmentally sustainable strategy for managing dengue transmission. However, the susceptibility of existing Wolbachia strains utilized in controlling Aedes aegypti necessitates the investigation of novel strains to enhance dengue control efficacy. This study aimed to identify potential alternative Wolbachia strains for dengue control by comparing the genomes of seven Wolbachia pipientis strains: wMel, wAlbB, wlrr, wHm-C, wAnm, ant7, and a strain isolated from Aedes aegypti. We conducted comprehensive genomic analyses, including phylogenetic assessments, metabolic pathway evaluations, and characterization of the Cytoplasmic Incompatibility Factor (Cif) genes. Our analyses identified the strain wCin2USA1 as a strong candidate for alternative dengue control strategies. This strain demonstrated remarkable genomic similarities to wMel, an already established strain used as biocontrol for Aedes aegypti. Importantly, this strain presented two distinct pairs of Cif genes from different monophyletic types, each homologous to the Cif genes found in wMel and wAlbB. This genetic architecture suggests a high degree of compatibility and demonstrates promising potential for the suppression of Aedes aegypti populations through the induction of Cytoplasmic Incompatibility. The presence of multiple intact prophage regions also suggests greater adaptability compared to established strains. Our findings support the hypothesis that wCin2USA1 could serve as an effective biocontrol agent against dengue transmission. This work provides critical insights into developing innovative Wolbachia-based interventions aimed at mitigating the persistent threat posed by dengue fever. Future research should concentrate on optimizing release methodologies, evaluating ecological impacts, and assessing the strains effectiveness against the dengue virus. Author SummaryDengue fever is one of the fastest-growing mosquito-borne diseases in the world, causing illness and economic challenges in many countries. Current mosquito control methods, such as insecticides, are often costly, less effective over time, and harmful to the environment. An alternative approach uses naturally occurring bacteria called Wolbachia, which live inside insects. When certain Wolbachia strains are introduced into mosquitoes, they can reduce the insects ability to spread viruses like dengue. In our study, we compared the genetic makeup of several Wolbachia strains to identify new candidates that may work better for controlling dengue. We discovered that a strain called wCin2USA1 has strong potential because it shares important features with two strains already used successfully, while also having unique advantages. These include genes that help prevent mosquitoes from reproducing normally when carrying different Wolbachia strains, which can reduce mosquito populations. Our findings suggest that wCin2USA1 could be developed as a new, environmentally friendly tool to help reduce dengue transmission.