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Toxins
|July 26, 2016
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Summary

Rear-fanged snake venom composition reveals broadly distributed toxins like CRiSPs and CTLs, alongside unique three-finger toxins. Further research is needed to fully understand venom evolution in this diverse snake group.

Keywords:
Colubridaeevolutionproteinssnaketoxinstranscriptomics

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Area of Science:

  • Herpetology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Most snake venom research focuses on front-fanged species, neglecting the diverse rear-fanged snakes.
  • Understanding rear-fanged snake venom is crucial for a complete picture of snake venom evolution.
  • Existing knowledge on rear-fanged snake venom composition is limited.

Purpose of the Study:

  • To review the current knowledge of rear-fanged snake venom composition.
  • To analyze available protein and transcript sequences of venom toxins.
  • To provide new transcriptome data for three rear-fanged snake species.

Main Methods:

  • Literature review of existing studies on rear-fanged snake venom.
  • Compilation and analysis of protein and transcript sequences of venom toxins.
  • Generation of new transcriptome data from three rear-fanged snake venoms.

Main Results:

  • Cysteine-rich secretory proteins (CRiSPs), C-type lectins (CTLs), and snake venom metalloproteinases (SVMPs) are common in rear-fanged snake venoms.
  • Three-finger toxins (3FTxs) appear largely restricted to the Colubridae family.
  • Snake venom matrix metalloproteinases are present in several species, with some toxins transcribed at lower levels.

Conclusions:

  • The study provides insights into the evolution of snake venom toxin families.
  • Generalizations about rear-fanged snake venom are limited due to the small number of species studied.
  • New venom protein families are likely to be discovered, especially in species with specialized diets.