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Related Experiment Video

Updated: May 16, 2026

Rearing and Injection of Manduca sexta Larvae to Assess Bacterial Virulence
09:04

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Published on: December 11, 2012

A comprehensive analysis of the Manduca sexta immunotranscriptome.

Ramesh T Gunaratna1, Haobo Jiang

  • 1Department of Entomology and Plant Pathology, Oklahoma State University, Stillwater, OK 74078, USA.

Developmental and Comparative Immunology
|November 27, 2012
PubMed
Summary

Manduca sexta research reveals 232 immunity-related genes, including pathogen recognition and signal transduction proteins. This study enhances understanding of insect innate immunity and identifies key defense pathways in fat body and hemocytes.

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Last Updated: May 16, 2026

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Area of Science:

  • Insect immunology
  • Biochemistry
  • Genomics

Background:

  • Manduca sexta is a key model organism for studying insect innate immunity.
  • Previous RNA-Seq studies have investigated its tissue immunotranscriptomes.
  • Functional analysis of transcriptomes in organisms lacking sequenced genomes is crucial.

Purpose of the Study:

  • To functionally analyze larval fat body and hemocyte transcriptomes of Manduca sexta using BLAST2GO.
  • To identify and categorize immunity-related genes and pathways.
  • To compare gene discovery methods based on homology and abundance changes.

Main Methods:

  • RNA-Sequencing (RNA-Seq) data analysis.
  • BLAST2GO for functional annotation of transcriptomes.
  • Identification of homologous contigs using immunity-related sequences from other insects.
  • Analysis of transcript levels and Gene Ontology (GO) classifications.

Main Results:

  • Established a repertoire of 232 immunity-related genes involved in pathogen recognition, signal transduction, and microbe killing.
  • Identified significant differences in nine GO categories, with a 155% increase in extracellular proteins post-immune challenge.
  • Mapped key components of Toll, IMD, MAPK-JNK-p38, and JAK-STAT signaling pathways, observing minor mRNA level changes.

Conclusions:

  • The study validates previous gene discovery methods for organisms lacking sequenced genomes.
  • Findings provide a comprehensive catalog of immunity-related genes and pathways in Manduca sexta.
  • This work lays the foundation for further in-depth analysis of the Manduca sexta immunogenome.