Molecular evolution of snake venom toxins

Area of Science:

• Evolutionary biology
• Molecular evolution
• Zoology

Background:

• Snake venom toxins exhibit significant diversity.
• Understanding the evolutionary relationships of these toxins is crucial for comprehending venom complexity.

Purpose of the Study:

• To construct phylogenetic trees for 62 snake venom toxins from the Proteroglyphae suborder.
• To propose a plausible evolutionary model for these toxins.

Main Methods:

• Matrix method for phylogenetic tree construction.
• Minimum Spanning Tree-Cluster Analysis (MSTCA) technique.
• Nodal ancestral sequence calculations and amino acid change rate comparisons.

Main Results:

• The MSTCA technique yielded the lowest percent deviation (8.55%).
• The constructed phylogenetic tree largely agrees with established zoological classifications.
• A derived evolutionary model suggests short neurotoxins are the ancestral form.

Conclusions:

• Snake venom toxin evolution is shaped by gene duplication and allelomorphism.
• Short neurotoxins represent the ancient form, with diversification leading to current toxin types.
• Phylogenetic analysis provides insights into venom toxin evolution and relationships.