CONSERVATION OF MOLECULAR PREPATTERNS DURING THE EVOLUTION OF CUTICLE MORPHOLOGY IN DROSOPHILA LARVAE

Area of Science:

• Evolutionary developmental biology
• Comparative genomics
• Drosophila melanogaster research

Background:

• Cuticle specialization in Drosophila larvae offers insights into morphological evolution.
• The virilis species group exhibits significant variation in larval dorsal hair distribution.

Purpose of the Study:

• Investigate the molecular, genetic, and developmental underpinnings of morphological evolution.
• Determine the evolutionary mechanisms behind diverse cuticle phenotypes in Drosophila.

Main Methods:

• Comparative analysis of cuticle morphology across Drosophila virilis species group.
• Examination of gene expression patterns related to larval patterning.

Main Results:

• Significant differences in dorsal hair coverage (20% vs. 70%) observed between species.
• Phenotypic similarities in cuticle morphology do not align with proposed phylogenetic relationships, suggesting convergent evolution.
• Conserved gene expression patterns found despite divergent cuticle morphologies.

Conclusions:

• Morphological evolution in this context likely results from altered responses to conserved molecular prepatterns.
• Convergent evolution of similar cuticle phenotypes occurred independently in different lineages.