Snake venom composition could be related to hormones and diet

Among the animals that can instill immediate fear in passers-by, snakes rank fairly high. They are stealthy and can strike quickly with precision. Many can inject victims with a nasty poison. Scientists have already found that venom composition varies between and within species. André Zelanis and colleagues wanted to conduct a precise protein profiling of the gland where the toxin is produced to find out more information about this variation.

The researchers analyzed venom from infant and adult snakes, both male and female, of the poisonous species Bothrops jararaca, a well-studied South American snake. Between the infants and adults, about 8 percent of the venom gland protein profiles differed. And the type of toxins expressed in the infants' glands were dominated by a different type than that dominating the adults' toxins, which could help the animals shift their diet from small reptiles and amphibians to mammals. The venom gland proteomes of males and females differed by almost 5 percent. The study's findings could indicate that hormones associated with either aging or gender play a role in what's in a snake's venom, the researchers say.