What is it about?
<<Chemosensory proteins (CSPs) are small soluble proteins that mediate olfactory recognition at the periphery of sensory receptors in insects, similarly to odorant-binding proteins (OBPs)>> This is an example of spin. It is now obvious that this insect protein superfamily's nomenclature and function are out of date. We propose renaming this protein family to reflect the latest discoveries regarding its locations, functions, and traits. Because of the highly conserved molecular characteristic of its structure, we propose renaming the protein "4CSP" (4-Cysteine Soluble Protein) instead of "CSP". This would avoid making reference to chemosensory proteins, which are present in the insect body's fat and gut.
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Why is it important?
Avoiding the Spin and overinterpreting facts based on a very nebulous theory is crucial. These "OS-D/CSPs" (and OBPs) are insect "olfactory" proteins, according to the first theory. However, they are up-regulated in the gut and fat body when we apply pesticide, most likely for a role in lipid metabolism and insecticide breakdown. These proteins are expressed in many different tissues when insecticide is not present. Why might we think that when they bind linoleic acid in reaction to insecticide exposure, they perceive the insecticide (thiametoxam)? It is crucial to take this into account in order to prevent another spin.
Perspectives
The 4CSP protein family, which has widespread tissue expression and a role in pesticide resistance, development, and general insect physiology in relation to lipid transport, exchange, and metabolism, opens up a new area of research. 4CSPs are found in every insect cell, but they are not as close to olfactory receptors. Targeting a protein that plays such a crucial part in the operation of an insect cell is likely to be very beneficial for both practical perspectives to control the insect in agriculture industry challenges as well as basic understanding of how a cell functions.
Prof. Dr. Jean-François Jeff Picimbon
Qilu University of Technology
Read the Original
This page is a summary of: Renaming the ‘OS-D/CSP’ Family (Part 1): ‘4-Cysteine Soluble Proteins’ (4CSPs)—Molecular Nomenclature, Structure, Expression, Evolution, Tissue-Distribution, and Pleiotropy, Insects, February 2026, MDPI AG,
DOI: 10.3390/insects17020202.
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