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Updated: Mar 27, 2026

The Insect Galleria mellonella as a Powerful Infection Model to Investigate Bacterial Pathogenesis

The Insect Galleria mellonella as a Powerful Infection Model to Investigate Bacterial Pathogenesis

Published on: December 11, 2012

A Cross-Order Comparative Genomics Analysis of Insect Innate Immunity Suggests Niche-Specific Adaptation.

Triveni Shelke¹, Vanika Gupta², Ishaan Gupta¹

¹Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology, New Delhi, India.

Journal of Computational Biology : a Journal of Computational Molecular Cell Biology

|March 25, 2026

Summary

This summary is machine-generated.

Insect innate immunity evolved with gene duplications and losses, showing lineage-specific innovations. Key immune genes like PGRP-SA and diptericin show positive selection, impacting pest management strategies.

Keywords:

comparative genomics gene family expansion insect immunity positive selection

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Area of Science:

Evolutionary biology
Immunology
Genomics

Background:

Insects face diverse pathogens, necessitating robust innate immunity.
Understanding the evolution of insect innate immunity is crucial but incomplete.
Genomic data offers insights into evolutionary paths of immune genes.

Purpose of the Study:

To analyze the class-level evolution of innate immunity in insects over ~300 million years.
To identify conserved immune components and lineage-specific innovations.
To investigate the evolutionary dynamics of immune genes across five major insect orders.

Main Methods:

Orthogroup analysis to track immune protein evolution.
Gene family dynamics assessment (duplications, losses).
Phylogenetic construction and positive selection analysis on immune proteins.

Main Results:

Incoherent distribution of immune orthologs across insect orders.
Noted gene losses (e.g., Defensin, transferrin, Cathepsin B) in specific lineages.
Lineage-specific conservation of antimicrobial peptides and expansion/contraction of PGRP-SA and Spatzle families.
Positive selection signatures found in PGRP-SA and diptericin proteins.

Conclusions:

Insect innate immunity shows significant evolutionary diversification driven by gene dynamics.
Adaptive evolution of specific immune proteins (PGRP-SA, diptericin) is evident.
Findings inform strategies for insect pest management and conservation.