Parasitic wasps do not lack lipogenesis.

Area of Science:

• Biochemistry
• Metabolic pathways
• Evolutionary biology

Background:

• Fatty acids are essential metabolites synthesized de novo through lipogenesis.
• Previous studies suggested parasitic wasps (parasitoids) lack lipogenesis, implying evolutionary trait loss.
• This challenged the understanding of metabolic capabilities in parasitoids.

Purpose of the Study:

• To investigate the presence and extent of de novo fatty acid biosynthesis in parasitoids.
• To re-evaluate the widely accepted notion that parasitoids have lost the ability to perform lipogenesis.
• To understand the regulation of lipogenesis in relation to lipid reserves in parasitoids.

Main Methods:

• Utilized ¹³C-labelled α-d-glucose to trace de novo fatty acid synthesis.
• Analyzed 13 species of parasitoids across seven families.
• Studied the model organism Nasonia vitripennis, including lipid analysis and ¹³C incorporation.

Main Results:

• Demonstrated de novo fatty acid biosynthesis from glucose in 13 parasitoid species.
• Confirmed lipogenesis occurs in Nasonia vitripennis even with intact lipid reserves.
• Observed increased ¹³C incorporation rates in females with depleted fat reserves.

Conclusions:

• The presumed 'lack of lipogenesis' in parasitoids is not universally applicable and needs re-evaluation.
• Parasitoids retain the metabolic capability for de novo fatty acid synthesis.
• Lipogenesis regulation in parasitoids may be influenced by lipid storage levels.