CONVERGENT EVOLUTION BETWEEN ENDOSYMBIOTIC BACTERIA IN FEATHER-FEEDING LICE

Area of Science:

• Microbial Genomics
• Symbiotic Relationships
• Evolutionary Biology

Background:

• Feather-feeding lice have nutrient-deficient diets, relying on bacterial endosymbionts.
• Endosymbiotic bacteria of the genus Sodalis in lice exhibit genome degeneration.
• The evolutionary trajectory of other bacterial endosymbionts in lice remains largely unexplored.

Purpose of the Study:

• To investigate the genome of an endosymbiotic Enterobacter species from a feather-feeding louse.
• To determine if this Enterobacter endosymbiont has undergone a similar degenerative process as Sodalis.
• To assess the metabolic capabilities of the Enterobacter endosymbiont in complementing the louse's diet.

Main Methods:

• Genome sequencing of the endosymbiotic Enterobacter species.
• Comparative genomic analysis of gene content related to nutrient synthesis.
• Analysis of gene loss and retention patterns in the endosymbiont.

Main Results:

• The endosymbiotic Enterobacter species possesses a reduced genome.
• It retains genes for B vitamin synthesis, compensating for the louse's dietary deficiency.
• It lacks genes for amino acid synthesis, mirroring Sodalis endosymbionts.

Conclusions:

• Both Sodalis and Enterobacter endosymbionts have independently evolved similar genome reduction strategies.
• These bacterial endosymbionts provide crucial metabolic services to feather-feeding lice.
• The findings suggest convergent evolution in bacterial endosymbionts adapting to parasitic hosts.