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Background <p>The blowfly <i>Lucilia cuprina</i> is a destructive parasite of sheep that causes flystrike or myiasis. Larvae consume the animal’s living flesh, producing large wounds that can lead to death. The main aim of this study was to identify genes that may play important roles in the behavior and physiology of <i>L. cuprina</i> larvae.</p> Methods <p>An RNA-Seq analysis of RNA from whole larvae at different developmental stages and third-instar head and gut tissues was used to identify sensory receptors and other genes relevant to the physiology of <i>L. cuprina</i> larvae. In addition, CRISPR/Cas9 gene editing was used to obtain a loss-of-function mutation for the <i>L. cuprina</i> odorant coreceptor gene (<i>LcupOrco</i>). The response of mutant larvae and adult females to fresh and rotten meat at different temperatures was evaluated.</p> Results <p>The RNA-Seq analysis suggested that odorant (OR), gustatory, ionotropic, and <i>Pickpocket</i> receptors may not play a central role in the <i>L. cuprina</i> larval sensory signaling and digestive systems. Rather, ATP-binding cassettes (ABCs) were highly enriched in head and gut RNA, and odorant-binding proteins (OBPs) only in the head. To confirm that ORs are not essential for larval detection of rotten beef, diet-choice assays were performed including larvae and adults homozygous for a null mutation in <i>LcupOrco</i>. While the attraction of adult females to rotten beef was disrupted, <i>LcupOrco</i> mutant larvae showed no change in diet preference.</p> Conclusions <p>The expression pattern of the ABC and OBP gene families suggests a central role in the sensory system of the <i>L. cuprina</i> larva for these receptors. Behavioral assays showed that ORs are essential for the adult female response to rotten beef, but not for larval behavior. These findings are consistent with high levels of expression of <i>LcupOrco</i> in the adult female antenna but very low expression in larvae.</p> Graphical abstract <p></p>

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Genetic and behavioral analyses suggest that larval and adult stages of Lucilia cuprina employ different sensory systems to detect rotten beef

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月9日

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  • Juan P. Wulff,
  • Rachel K. Laminack,
  • Maxwell J. Scott

摘要

Background

The blowfly Lucilia cuprina is a destructive parasite of sheep that causes flystrike or myiasis. Larvae consume the animal’s living flesh, producing large wounds that can lead to death. The main aim of this study was to identify genes that may play important roles in the behavior and physiology of L. cuprina larvae.

Methods

An RNA-Seq analysis of RNA from whole larvae at different developmental stages and third-instar head and gut tissues was used to identify sensory receptors and other genes relevant to the physiology of L. cuprina larvae. In addition, CRISPR/Cas9 gene editing was used to obtain a loss-of-function mutation for the L. cuprina odorant coreceptor gene (LcupOrco). The response of mutant larvae and adult females to fresh and rotten meat at different temperatures was evaluated.

Results

The RNA-Seq analysis suggested that odorant (OR), gustatory, ionotropic, and Pickpocket receptors may not play a central role in the L. cuprina larval sensory signaling and digestive systems. Rather, ATP-binding cassettes (ABCs) were highly enriched in head and gut RNA, and odorant-binding proteins (OBPs) only in the head. To confirm that ORs are not essential for larval detection of rotten beef, diet-choice assays were performed including larvae and adults homozygous for a null mutation in LcupOrco. While the attraction of adult females to rotten beef was disrupted, LcupOrco mutant larvae showed no change in diet preference.

Conclusions

The expression pattern of the ABC and OBP gene families suggests a central role in the sensory system of the L. cuprina larva for these receptors. Behavioral assays showed that ORs are essential for the adult female response to rotten beef, but not for larval behavior. These findings are consistent with high levels of expression of LcupOrco in the adult female antenna but very low expression in larvae.

Graphical abstract