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Updated: Sep 4, 2025
Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
Published on: April 21, 2018
Venom resistance mechanisms in centipede show tissue specificity
Yunfei Wang1, Chuanlin Yin2, Hao Zhang3
1Key Laboratory of Animal Models and Human Disease Mechanisms, Key Laboratory of Bioactive Peptides of Yunnan Province, Engineering Laboratory of Bioactive Peptides, The National & Local Joint Engineering Center of Natural Bioactive Peptides, KIZ-CUHK Joint Laboratory of Bioresources and Molecular Research in Common Diseases, National Resource Center for Non-Human Primates, Kunming Primate Research Center, National Research Facility for Phenotypic & Genetic Analysis of Model Animals (Primate Facility), Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, 650107 Yunnan, China; College of Wildlife and Protected Area, Northeast Forestry University, Harbin 150040, China.
Centipedes possess a unique KCNQ1 channel splice variant in their venom glands, conferring resistance to their own toxins. This mechanism protects venom glands from self-intoxication, enabling safe toxin storage and secretion.
Area of Science:
- Molecular Biology
- Toxicology
- Animal Physiology
Background:
- Venomous animals use toxins for various interactions, necessitating mechanisms to protect venom-producing tissues.
- Tissue-specific resistance is crucial for venom glands to safely store and secrete toxins.
Purpose of the Study:
- To elucidate the mechanism of tissue-specific toxin resistance in the centipede Scolopendra subspinipes mutilans.
- To identify how venom glands protect themselves from potent toxins.
Main Methods:
- Analysis of KCNQ1 channel gene expression and splicing in centipede venom glands.
- Identification and characterization of a unique KCNQ1 splice variant.
- Investigating the structural and functional properties of the splice variant in relation to toxin binding.
Main Results:
- A novel splice variant of the KCNQ1 channel is highly expressed in the centipede venom gland.
- This variant, differing in exon usage (exon 6 instead of 7) and containing eleven mutated residues, confers resistance to the centipede's toxin (SsTx).
- Resistance is attributed to a partially buried binding site in the modified KCNQ1 channel.
Conclusions:
- Tissue-specific modification of the KCNQ1 channel via alternative splicing provides resistance to endogenous toxins in centipede venom glands.
- This mechanism establishes a protected environment for venom storage and secretion, distinct from known resistance strategies involving single exon mutations.
