Essential fatty acids in clinically stable children with propionic acidaemia

Area of Science:

• Biochemistry
• Metabolic Disorders
• Pediatrics

Background:

• Propionic acidemia (PA) is a metabolic disorder characterized by the accumulation of odd-chain fatty acids.
• The impact of PA on the synthesis of long-chain polyunsaturated fatty acids (LCPUFA) remains largely uninvestigated.

Purpose of the Study:

• To investigate whether LCPUFA synthesis is affected in children with propionic acidemia.
• To compare fatty acid composition in plasma phospholipids, triglycerides, and sterol esters between PA patients and healthy controls.

Main Methods:

• Analysis of plasma phospholipid, triglyceride, and sterol ester fatty acid composition in five clinically stable children with PA.
• Comparison of results with 18 age-matched healthy controls.
• Quantification of odd-numbered fatty acids and assessment of omega-6 and omega-3 LCPUFA synthesis pathways.

Main Results:

• Odd-numbered fatty acids were detected in all PA patients, with median values of zero in controls.
• No significant differences were observed in the percentage contributions of linoleic acid (omega-6 precursor) and arachidonic acid (omega-6 product) between groups.
• Similarly, alpha-linolenic acid (omega-3 precursor) and docosahexaenoic acid (omega-3 product) levels did not differ between PA patients and controls.

Conclusions:

• Disturbances in fatty acid metabolism associated with propionic acidemia do not appear to impair LCPUFA synthesis in clinically stable children.
• LCPUFA synthesis pathways remain intact despite the presence of accumulated odd-chain fatty acids in PA.