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Sunday, February 12, 2017
Two major groups of rabies virus display distinct evolutionary trends.
Genome data reveal the evolutionary patterns that underlie jumps between rabies host species.Using hundreds of viral genome sequences, scientists have shown that two major groups of rabies virus have unique evolutionary tendencies and their findings are presented in a study published in PLOS Pathogens.
Diseases that jump from other vertebrate hosts to humans are a major public health threat, but the evolutionary mechanisms behind these jumps are poorly understood. With its long history of jumping between host species, the rabies virus offers a good opportunity to identify evolutionary patterns associated with such shifts.
The scientists compared 321 viral genome sequences collected from 66 countries over 65 years. The analysis revealed very different evolutionary patterns for bat-related rabies, which is found in bats and some carnivores; versus dog-related rabies, which is responsible for almost all human cases of rabies and is found in both dogs and wild carnivores.
The data suggest that different subgroups of bat-related rabies do not evolve uniformly, but dog-related rabies usually evolves at a steady rate. For dog-related rabies, host jumping was linked to multiple evolutionary patterns, such as parallel changes in amino acid sequences between different host species. The data also suggest that dog-related rabies may not need to evolve much to jump to new carnivore hosts.
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