Patterns of gene duplication in lepidopteran pheromone binding proteins

Area of Science:

• Molecular Biology
• Evolutionary Genetics
• Insect Biochemistry

Background:

• Pheromone Binding Proteins (PBPs) are crucial for insect chemoreception, particularly in moths.
• The PBP multigene family exhibits diversity across different lepidopteran species.
• Understanding PBP evolution can shed light on insect communication and adaptation.

Purpose of the Study:

• To isolate and characterize novel Pheromone Binding Proteins (PBPs) from the gypsy moth, *Lymantria dispar*.
• To investigate the evolutionary history and duplication events within the Lepidopteran PBP multigene family.
• To correlate evolutionary findings with the biochemical diversification of moth PBPs.

Main Methods:

• Isolation and characterization of complementary DNAs (cDNAs) encoding two distinct PBPs from *Lymantria dispar*.
• Comparative sequence analysis of *L. dispar* PBP sequences with other published lepidopteran PBPs.
• Phylogenetic analyses to infer evolutionary relationships and identify gene duplication events.

Main Results:

• Two distinct PBP cDNAs were successfully isolated and characterized from the gypsy moth.
• Phylogenetic analyses suggest that the presence of multiple PBPs in different moth superfamilies resulted from independent, recent gene duplication events.
• These findings differentiate from a single, ancient duplication event as the primary driver of PBP diversity.

Conclusions:

• The PBP gene family in moths has evolved through relatively recent, independent duplication events.
• This evolutionary pattern likely contributes to the observed biochemical diversification of PBPs across moth species.
• The study provides insights into the molecular mechanisms driving the evolution of chemosensory systems in insects.