Data from: Integrated molecular and metatranscriptomic evidence of Tacaribe virus and the brain virome profile of Molossus molossus bat sampled in Brazil

Tacaribe virus (TCRV), a New World arenavirus (NWA), is associated with neotropical frugivorous bats, particularly Artibeus spp., and is considered to have zoonotic potential. Here, we report the detection of TCRV in multiple biological compartments of a Molossus molossus (velvety free-tailed bat), an insectivorous species commonly found in Brazilian urban ecosystems. Brain tissues negative for rabies were subjected to high-throughput RNA sequencing, revealing a diverse array of viral taxa, including partial L and S segments of TCRV with respective genome coverages of 68.2% and 65.6%,. These sequences shared 90% nucleotide identity and 94% amino acid identity with TCRV reference strains. Phylogenetic reconstruction grouped the newly identified TCRV sequences and the TCRV strain A354 (isolated from a Brazilian Artibeus planirostris bat) within a clade that also includes Tietê mammarenavirus strains (Brazilian Carollia perspicillata bat), both of which are genetically divergent members of the Arenaviridae family. The detection of TCRV in M. molossus may indicate previously unrecognized circulation of this virus in insectivorous bats, expanding our understanding of its tissue tropism and host range. This finding is particularly significant given the synanthropic behavior of M. molossus bats and its potential implications for TCRV evolution. Moreover, our results highlight the critical role of untargeted high-throughput sequencing in uncovering overlooked viral diversity, enabling the detection of unexpected pathogens in non-traditional hosts and tissues. While TCRV remains poorly characterized in terms of human pathogenicity, continued surveillance is warranted to assess potential spillover risks.