EST and microarray analysis of horn development in Onthophagus beetles

Area of Science:

• Evolutionary developmental biology (evo-devo)
• Evolutionary ecology
• Genomics

Background:

• Investigates the genetic and genomic basis of novel trait evolution and diversification.
• Focuses on horned beetles (Onthophagus taurus) as an ecologically complex and experimentally tractable model system.

Purpose of the Study:

• To identify candidate genes involved in the evolution and diversification of beetle horns.
• To compare gene expression profiles between developing horns and legs.

Main Methods:

• Developed normalized cDNA libraries from larval and pupal Onthophagus taurus.
• Sequenced expressed sequence tags (ESTs) and assembled them into contigs and singletons.
• Utilized microarrays to contrast transcriptomes of developing head horns, prothoracic horns, and legs.

Main Results:

• Identified a comprehensive list of candidate genes for beetle horn evolution.
• Found similarities and differences in transcription profiles between developing horns and legs, suggesting partial gene recruitment.
• Observed distinct transcription profiles between head and prothoracic horns, indicating independent evolutionary origins.

Conclusions:

• Established a foundation for systematic analysis of genetic mechanisms underlying horned beetle development and diversification.
• Provides significant potential contributions to evolutionary developmental biology research frontiers.