Episode Details

Prepared by: Claudinéia Pereira Costa, PhD; Meghan Barrett, PhD

Note: This report has not been peer-reviewed and has only been generated for the Forum. Results should be interpreted with caution, though we do follow peer-reviewed methodologies.

Executive Summary

• We analyzed the publicly-available Kerria lacca (Hemiptera: Kerriidae) genome, which was generated from late-stage, sessile adult females, for evidence of nine receptor genes in seven orthologous gene families related to heat, cold, chemical, and mechanical nociception in other insects.
  • Finding any of these genes does not prove nociception is present; functional assays and confirmation of these receptors in nociceptors would be needed.
  • Finding these genes are absent does not prove nociception is absent; other genes may exist for nociception and different insect groups have evolved their own receptors. 
  • Nevertheless, finding presence/absence of these genes may be probability-shifting compared to true ignorance of their presence/absence.
• We find K. lacca has six of seven gene families, including genes that (in other species) encode for proteins with noxious heat, cold, chemical, and mechanical responsiveness. 
  • Pkd2, which in fruit fly larvae is expected to have a direct role in cold sensing in Class III multidendritic neurons, was not detected in the search.
• These data do not prove [...]

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Outline:

(00:36) Executive Summary

(02:14) Introduction

(08:51) Findings and Discussion

(08:55) Strong support for genes that may encode responsiveness to noxious heat, chemical, and mechanical stimuli in adult female K. lacca genome

(10:22) K. lacca gene copy number profile is similar to other hemipterans for these gene families

(11:21) Noxious cold-sensing channel Pkd2, with function known from fruit flies, was not detected; but, other mechanisms for cold-sensing could still be present, as cold-sensing is critically understudied in arthropods

(14:55) Further research confirming the nociceptive functions of the proteins encoded by these genes, as well as their expression in nociceptors, is needed to confirm nociception in K. lacca

(16:24) Methods

(16:27) Obtaining the Genome

(16:46) Gene Family Analysis

(20:00) Code Availability

(20:31) Acknowledgements

The original text contained 1 footnote which was omitted from this narration.

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First published:
August 17th, 2026

Source:
https://forum.effectivealtruism.org/posts/2JdY8vuMAYcbqX5p9/research-report-a-genetic-basis-for-potential-nociception-in

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Narrated by TYPE III AUDIO.

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