J Syst Evol

• Research Article •    

Genomic and functional insights into dietary diversification in New World leaf-nosed bats (Phyllostomidae)

Yiran Xu1#, Yingcan Li1#, Huiqiao Hu1, Hengwu Jiao2, and Huabin Zhao1*   

  1. 1 College of Life Sciences, Key Laboratory of Biodiversity and Environment on the Qinghai-Tibetan Plateau of the Ministry of Education, Wuhan University, Wuhan 430072, China;
    2 School of Life Sciences, Central China Normal University, Wuhan 430079, China
    *Author for correspondence. E-mail:huabinzhao@whu.edu.cn
    #These authors contributed equally to this work
  • Received:2023-10-08 Accepted:2024-01-15

Abstract: The most significant driver of adaptive radiation in the New World leaf-nosed bats (Phyllostomidae) is their remarkably diverse feeding habits, yet there remains a notable scarcity of studies addressing the genetic underpinnings of dietary diversification in this family. In this study, we have assembled a new genome for a representative species of phyllostomid bat, the fringe-lipped bat (Trachops cirrhosis), and integrated it with eight published phyllostomid genomes, along with an additional 10 genomes of other bat species. Comparative genomic analysis across 10,200 orthologus genes has unveiled that those genes subject to divergent selection within the Phyllostomidae clade are notably enriched in metabolism-related pathways. Furthermore, we identified molecular signatures of divergent selection in the bitter receptor gene Tas2r1, as well as 14 genes involved in digesting key nutrients such as carbohydrates, proteins, and fats. In addition, our cell-based functional assays conducted on Tas2r1 showed a broader spectrum of perception for bitter compounds in phyllostomids compared to non-phyllostomid bats, suggesting functional diversification of bitter taste in Phyllostomidae. Together, our genomic and functional analyses lead us to propose that divergent selection of genes associated with taste, digestion and absorption, and metabolism assumes a pivotal role in steering the extreme dietary diversification in Phyllostomidae. This study not only illuminates the genetic mechanisms underlying dietary adaptations in Phyllostomidae bats but also enhances our understanding of their extraordinary adaptive radiation.

Key words: Dietary diversification, Evolutionary genomics, Bats