Unveiling metabolic integration in psyllids and their nutritional endosymbionts through comparative transcriptomics...

Area of Science:

• Insect-microbe interactions
• Symbiosis
• Genomics and transcriptomics

Background:

• Psyllids harbor the endosymbiont Carsonella, which synthesizes essential nutrients.
• Carsonella lacks genes for complete nutrient synthesis, implying host gene compensation.
• Investigating host-microbe gene expression is crucial for understanding symbiotic nutrient provisioning.

Purpose of the Study:

• To compare gene expression in bacteriomes of two psyllid species, Bactericera cockerelli and Diaphorina citri.
• To identify conserved and species-specific gene expression patterns related to symbiosis.
• To elucidate host adaptations in regulating nutrient metabolism and nitrogen recycling.

Main Methods:

• Comparative transcriptomics of bacteriomes from B. cockerelli and D. citri.
• Analysis of gene expression patterns for collaborative and lineage-specific genes.
• Focus on genes involved in nutrient synthesis and nitrogen metabolism.

Main Results:

• Conserved gene expression observed in collaborative psyllid genes, including horizontally transferred genes.
• Species-specific gene expression patterns suggest differential nutritional metabolism between psyllid species.
• Evidence indicates glutamate dehydrogenase (GDH) may be key for nitrogen recycling in bacteriomes.
• Lineage-specific gene clusters showed differential expression in B. cockerelli and D. citri.

Conclusions:

• Psyllid host genes play a compensatory role in nutrient synthesis for Carsonella symbionts.
• Host adaptations in gene expression regulate symbiosis, influenced by host, microbiome, and environment.
• Understanding these adaptations is vital for insect nutritional ecology and pest management.