Evolutionary analysis of snake venom reveals that toxin proteins arose from multiple body tissues
Bryan Grieg Fry, Ph.D., a scientist from the University of Melbourne, Australia, has conducted the first comprehensive analysis of the origin and evolution of one of natures most sophisticated bioweapons: snake venom. His results are reported in the March issue of the journal Genome Research. Venomous snakes, all of which belong to the superfamily Colubroidea, evolved glands for the storage and dispersal of their saliva approximately 60-80 million years ago. Since that time, various prey-immobilizing toxins have evolved from innocuous proteins that were normally produced in other body tissues.
Scientists believe that snakes, rather than simply tweaking proteins already expressed in their saliva, recruited and altered proteins for their chemical arsenal from other body tissues. This enabled snakes to develop more specific, highly potent toxins, ones that would cause their victims bodies to turn against themselves upon injection. Over time, these newly derived toxins became a normal part of the saliva protein repertoire. To date, 24 different snake venom toxins have been characterized by scientists, but the evolutionary history – or tissue origin – of these proteins has not been documented.
Maria A. Smit | EurekAlert!
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