Function and evolution of microRNAs in eusocial Hymenoptera

Area of Science:

• Evolutionary biology
• Molecular genetics
• Behavioral ecology

Background:

• Eusociality, or "true sociality," is a highly successful evolutionary adaptation in insects, characterized by reproductive division of labor and cooperative brood care.
• The molecular underpinnings of social behavior regulation and its evolution in eusocial insects remain largely unexplored.
• Recent advancements in whole-genome sequencing provide opportunities to investigate the genetic basis of eusociality.

Purpose of the Study:

• To discuss recent findings on the role of non-coding microRNAs (miRNAs) in modulating traits associated with reproductive and behavioral divisions of labor in eusocial insects.
• To explore the evolutionary modifications that led to the development of eusociality.
• To investigate the potential contribution of Hymenoptera-specific miRNAs to the evolution of eusocial traits.

Main Methods:

• Analysis of mRNA expression patterns in the brains of various eusocial insect species.
• Bioinformatic analysis of miRNA data.
• Phylogenetic analysis of miRNA evolution.

Main Results:

• Specific social behavioral states in workers and queens correlate with distinct tissue-specific transcriptional profiles.
• Non-coding microRNAs (miRNAs) are implicated in modulating traits related to reproductive and behavioral divisions of labor.
• Bioinformatic and phylogenetic data suggest a role for Hymenoptera-specific miRNAs in the evolution of eusociality.

Conclusions:

• MicroRNAs are significant regulators of social behavior and divisions of labor in eusocial insects.
• Hymenoptera-specific miRNAs likely contributed to the evolutionary success of eusociality in this insect order.
• Further research into miRNA evolution can illuminate the genetic basis of complex social systems.