Unveiling the Mystery of PEDV's Origins: A Deep Dive into the Bat Virome in Indochina
Bats, often overlooked in scientific research, are the unsung heroes of our ecosystem, acting as critical reservoirs for viruses with a high potential for cross-species spillover. A recent study led by researchers from Beijing University of Chemical Technology, the Academy of Military Medical Sciences, and their partners has shed light on the bat virome diversity in Indochina, offering crucial insights into the origins of porcine epidemic diarrhea virus (PEDV).
The team, from 2020 to 2024, analyzed 659 samples from 197 bats across 16 species using next-generation sequencing (NGS). Their findings revealed a treasure trove of viral strains, with 137 identified across 27 families, including 40 novel species. The Rhinolophidae bats from China's Yunnan and Guangxi Zhuang Autonomous Region provinces emerged as the viral diversity hotspots, hosting 13 viral families and MERS-like coronaviruses. Conversely, Cambodian bats carried viruses that were evolutionarily distant from known strains, presenting a unique genetic landscape.
A groundbreaking discovery was the identification of a PEDV-related virus in Cambodian Chaerephon plicatus bats. This virus, named CBMo.plicatusPEDV-like_1, exhibited a remarkable 90.36% genome homology with the PEDV CV777 strain and displayed a recombinant structure, combining suid-adapted ORF1ab and bat-adapted Spike genes. This finding further solidifies the evidence suggesting bats as the potential evolutionary source of PEDV. Recombination analysis of 18 sequences revealed a high frequency of viral genetic exchange, with five regions showing no breakpoints (BFRs), emphasizing the dynamic nature of viral evolution.
Deep learning models further underscored the risks of host adaptation. The ORF1ab of the PEDV-related virus showed a preference for suids (pigs), while its Spike gene favored bats, raising concerns about potential spillover if mutations occur. This highlights the importance of continued surveillance and research to prevent future zoonotic outbreaks.
"Our findings underscore critical surveillance gaps," said corresponding author Yigang Tong. "The unique ecology of the Indochina Peninsula drives viral diversity and recombination. We call for enhanced cross-border 'One Health' initiatives targeting bat-human interfaces and recombination hotspots to prevent future zoonotic outbreaks."
Yigang Tong, a renowned virologist, holds a BSc in Genetics from Fudan University, an M.S. in Medical Genetics, and a Ph.D. in Microbiology from the Academy of Military Medical Sciences (AMMS) in China. His extensive research experience, including a postdoctoral fellowship at the University of British Columbia (UBC), Canada, and his work as a research scientist at the General Hospital of Beijing Military Region, has positioned him as a pioneer in virology. Tong's contributions include identifying cepharanthine, a component of traditional Chinese medicine, as a potent broad-spectrum antiviral agent against coronaviruses and developing innovative bioinformatics methods for phage genome terminal identification and functional prophage detection in bacterial genomes.
His current research interests focus on virology, antiviral drugs, vaccines, bacteriophage, and bioinformatics, addressing global challenges posed by emerging infectious diseases and drug-resistant bacteria. With over 500 publications in peer-reviewed international journals, including Nature, PNAS, and Lancet Infectious Diseases, Tong's work has been widely recognized. His study on Ebola virus evolution, published in Nature, was named one of the "Top 10 Scientific Advances in China" in 2015.
This groundbreaking research highlights the importance of continued surveillance and collaboration to prevent future zoonotic outbreaks. As we delve deeper into the bat virome in Indochina, we unlock the secrets of viral evolution and pave the way for innovative solutions to protect human and animal health.
