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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Physiology of Smell and Olfactory Pathway01:20

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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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Chemosensory System Decoding: Transcriptome-Wide Identification and Expression Profiling of Olfactory Genes in Lytta

Feng Zhou1, Zhuan-Xia Li1, Jia-Ni Chen1

  • 1College of Life Science Northwest Normal University Lanzhou China.

Ecology and Evolution
|December 12, 2025
PubMed
Summary

This study identifies 70 chemosensory genes in the blister beetle, Lytta sifanica, revealing their diverse expression patterns across tissues. These findings provide crucial insights into the molecular basis of insect olfaction and beetle communication.

Keywords:
antennal transcriptomeblister beetlechemosensory genegene expression analysisgene identification

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Area of Science:

  • Entomology
  • Molecular Biology
  • Genomics

Background:

  • Insect olfaction is mediated by a complex set of olfactory-related proteins.
  • Understanding these proteins is key to insect communication and environmental interaction.
  • Lytta sifanica, an economically important blister beetle, produces cantharidin but its olfactory mechanisms are unknown.

Purpose of the Study:

  • To characterize the molecular basis of olfactory sensation in Lytta sifanica.
  • To identify and analyze chemosensory genes in the antennae of L. sifanica.
  • To investigate the expression patterns of these genes across various tissues.

Main Methods:

  • Transcriptome sequencing of adult L. sifanica antennae.
  • Sequence homology analysis and phylogenetic reconstruction to identify chemosensory genes.
  • RT-PCR to confirm gene expression profiles in multiple tissues.

Main Results:

  • Seventy chemosensory genes were identified, including odorant binding proteins (OBPs), chemosensory proteins (CSPs), gustatory receptors (GRs), odorant receptors (ORs), ionotropic receptors (IRs), and sensory neuron membrane proteins (SNMPs).
  • These genes showed broad expression across tissues, with distinct tissue-specific patterns.
  • Eleven genes were predominantly expressed in the antennae, while others showed specific expression in mouthparts, foreleg tarsi, head, pronotum, and abdomen skin.

Conclusions:

  • The identified chemosensory genes provide a foundational resource for studying olfaction in Lytta sifanica.
  • Distinct expression patterns suggest diverse roles for these genes beyond olfaction, potentially in other sensory modalities or functions.
  • This research enhances our understanding of chemoreception mechanisms in beetles.