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Analysis of Gene Expression in Emerald Ash Borer Agrilus planipennis Using Quantitative Real Time-PCR
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Cytochrome P450 Genes Expressed in Phasmatodea Midguts.

Matan Shelomi1

  • 1Department of Entomology, National Taiwan University, Taipei City 10617, Taiwan.

Insects
|October 27, 2022
PubMed
Summary

Cytochrome P450s (CYPs) in stick insects show unique expansions in certain gene families, particularly CYP15A1. These findings offer insights into insect evolution and detoxification gene diversity.

Keywords:
Phasmatodeacytochrome P450stick insectsxenobiotic metabolism

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Area of Science:

  • Insect molecular biology
  • Evolutionary genomics
  • Biochemistry

Background:

  • Cytochrome P450s (CYPs) are crucial for detoxifying foreign compounds in eukaryotes.
  • Insects utilize CYPs to manage plant chemicals and develop insecticide resistance.
  • CYP diversity may reflect an organism's diet and ecological specialization.

Purpose of the Study:

  • To investigate CYP gene diversity in the midguts of six folivorous stick insect species (Phasmatodea).
  • To identify the CYP complement and explore potential correlations with diet toxicity or specialization.
  • To understand the evolutionary factors shaping CYP genes in Phasmatodea.

Main Methods:

  • Mining CYP genes from six published Phasmatodea transcriptomes.
  • Phylogenetic analysis of identified CYP genes.
  • Comparative analysis of CYP complements across species.

Main Results:

  • The Phasmatodea CYP complement is similar to other insects but has lower overall numbers.
  • Significant expansions were observed in CYP clades 6J1, 6A13/14, 4C1, and 15A1.
  • Multiple CYP15A1 genes were found, a unique trait among insects, with their function currently unknown.
  • No direct correlation was established between CYP profiles and diet specialization or toxicity.

Conclusions:

  • CYP evolution in Phasmatodea involves both lineage-specific expansions and inheritance from common ancestors.
  • The expanded CYP15A1 family in stick insects presents a novel area for functional investigation, potentially involving neofunctionalization.
  • CYP diversity in stick insects appears shaped by factors beyond simple diet specialization or toxicity.