Unique microbes found inside scorpion venom

Jenn Hoskins
26th January, 2026

Unique microbes found inside scorpion venom

To investigate geographic influences on the newly discovered venom microbiome, this study compared two scorpion species, Anuroctonus phaiodactylus (A) and Paruroctonus becki (B), collected from four distinct sites across the Mojave and Great Basin deserts (C).

Image adapted from: Murdoch et al. / CC BY (Source)

Key Findings

  • Scorpion venom, previously thought sterile, harbors diverse bacterial communities in both Paruroctonus becki and Anuroctonus phaiodactylus species
  • The bacterial composition of scorpion venom varies between species, suggesting each has a unique microbiome
  • Geographical location influences the venom microbiome, with scorpions from the Great Basin desert exhibiting greater bacterial diversity than those from California
Animal venoms, historically viewed as sterile environments due to their low nutrient content and antimicrobial properties, are now being recognized as potential habitats for bacteria. This challenges the long-held assumption that venom is devoid of microbial life and opens new avenues for understanding venom composition and function. Researchers at Eastern Connecticut State University and the University of Dubuque[1] investigated whether scorpion venom harbors bacterial communities, and if these communities vary depending on the scorpion species and geographic location. The study focused on two scorpion species – Paruoctonus becki and Anuroctonus phaiodactylus – collected from the Mojave and Great Basin deserts. Previous research into the broader role of microbes in animal health has demonstrated the significant impact of commensal bacteria on host metabolism and immunity[2]. This work highlighted that disruptions in these bacterial communities can contribute to age-related diseases, including chronic inflammation and cancer, and that maintaining a healthy microbial balance is crucial for longevity. The researchers sought to determine if a similar relationship existed within scorpion venom itself. To achieve this, they employed 16S rRNA amplicon sequencing, a technique used to identify and characterize bacterial species based on their genetic material. Importantly, this study differed from previous investigations by analyzing the venom secretion directly, rather than examining the venom gland and surrounding tissues. This approach provided a more accurate representation of the actual microbial inhabitants of the venom. The findings revealed that both scorpion species did indeed contain diverse bacterial communities. This contradicts the previous understanding of venom as a sterile substance. While the specific bacterial composition differed between the two species, suggesting a species-specific microbiome, there was also evidence of geographic variation within each species. This indicates that environmental factors play a role in shaping the venom’s microbial landscape. Interestingly, this discovery aligns with the growing body of evidence emphasizing the complex interplay between animals and their associated microbial communities. The presence of bacteria in scorpion venom raises questions about their potential roles. They could be involved in venom toxicity, prey digestion, or even defense against competing microbes. Furthermore, this research builds upon studies detailing the enzymatic complexity of scorpion venoms[3], which identified a core set of enzymes present across multiple scorpion species. The presence of bacteria could contribute to this enzymatic diversity, potentially through the production of novel enzymes or the modification of existing venom components. The study also echoes findings from research on pain-inducing venoms[4], which demonstrated the importance of venom components beyond simple toxicity in predator deterrence. Bacteria within the venom could contribute to the overall deterrent effect, potentially through the production of painful or irritating compounds. The research team’s work represents a crucial first step in understanding the ecology of scorpion venom microbiomes. Future research will focus on identifying the specific functions of these bacteria and their impact on scorpion biology.

BiochemEcologyAnimal Science

References

Main Study

1) Microbiota discovered in scorpion venom

Published 22nd January, 2026

https://doi.org/10.1371/journal.pone.0328427

Related Studies

2) PGRP-SC2 promotes gut immune homeostasis to limit commensal dysbiosis and extend lifespan.

https://doi.org/10.1016/j.cell.2013.12.018

3) The Enzymatic Core of Scorpion Venoms.

https://doi.org/10.3390/toxins14040248

4) Defensive Venoms: Is Pain Sufficient for Predator Deterrence?

https://doi.org/10.3390/toxins12040260


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