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Acylcarnitine – Function, Diagnostics and Relevance

Acylcarnitine is a biochemical compound formed during the transport of fatty acids into the mitochondria. It plays a key role in energy metabolism and serves as an important biomarker for diagnosing metabolic disorders.

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Things worth knowing about "Acylcarnitine"

Acylcarnitine is a biochemical compound formed during the transport of fatty acids into the mitochondria. It plays a key role in energy metabolism and serves as an important biomarker for diagnosing metabolic disorders.

What is Acylcarnitine?

Acylcarnitine is an organic compound formed by the combination of carnitine and an acyl group (a fatty acid residue). It is produced in the body when fatty acids need to be transported into the mitochondria – the so-called powerhouses of the cells – for energy production. Acylcarnitines are therefore essential intermediates in fatty acid metabolism.

Biochemical Function and Mechanism of Action

Long-chain fatty acids cannot cross the inner mitochondrial membrane on their own. To enter the mitochondria, they must first be bound to carnitine. This process is catalyzed by the enzyme Carnitine Palmitoyltransferase I (CPT I), producing acylcarnitine.

The resulting acylcarnitine is transported across the inner mitochondrial membrane by a specific carrier protein called the carnitine-acylcarnitine translocase.
Inside the mitochondria, the acyl group is cleaved from carnitine (by CPT II), and the fatty acid enters beta-oxidation, where it is broken down to generate energy.
The released carnitine is transported back to the cytoplasm and becomes available for further transport cycles.

Acylcarnitines are thus natural intermediates of this transport process and accumulate in elevated amounts when metabolic pathways are disrupted.

Classification of Acylcarnitines

Acylcarnitines are classified according to the chain length of the bound fatty acid:

Short-chain acylcarnitines (C2–C5): e.g., acetylcarnitine (C2), propionylcarnitine (C3)
Medium-chain acylcarnitines (C6–C12): e.g., octanoylcarnitine (C8)
Long-chain acylcarnitines (C14–C20): e.g., palmitoylcarnitine (C16)

Each acylcarnitine profile can point to specific enzyme defects or metabolic disorders.

Role as a Biomarker in Diagnostics

Measuring acylcarnitine profiles in blood is a central tool in newborn screening and the diagnosis of inherited metabolic disorders. Using tandem mass spectrometry (MS/MS), characteristic acylcarnitine patterns can be identified that indicate specific enzyme deficiencies.

Conditions Diagnosed via Acylcarnitine Profiles

Fatty acid oxidation disorders: e.g., MCAD deficiency (Medium-Chain Acyl-CoA Dehydrogenase deficiency) – elevated C8 acylcarnitine
Organic acidurias: e.g., propionic acidemia (elevated C3), methylmalonic acidemia
Carnitine metabolism disorders: e.g., primary carnitine deficiency or CPT I/II deficiency
Amino acid disorders: e.g., isovaleric acidemia (elevated C5)

Acylcarnitine in Newborn Screening

In many countries, newborn screening is mandated by law and includes the analysis of acylcarnitine profiles from a heel-prick dried blood spot test. This screening enables the early detection of more than 20 inherited metabolic disorders before clinical symptoms appear and can be life-saving.

Clinical Relevance in Adults

Acylcarnitines are also increasingly relevant in adult medicine:

Elevated long-chain acylcarnitines have been associated with insulin resistance and type 2 diabetes.
Changes in the acylcarnitine profile may indicate mitochondrial dysfunction.
In sports medicine, acylcarnitines are studied as markers of energy metabolism and muscular response to exercise.

Reference Values and Interpretation

Reference values for individual acylcarnitines vary depending on the laboratory, the patient's age, and the analytical method used. Interpretation of an acylcarnitine profile should always be performed by a specialist in metabolic disorders or a clinical geneticist, as the patterns are complex and must be evaluated within the broader clinical context.

References

Rinaldo P, Cowan TM, Matern D. – Acylcarnitine profile analysis. In: Genetics in Medicine, 10(3):151–156, 2008. Available via PubMed.
Millington DS, Kodo N, Norwood DL, Roe CR. – Tandem mass spectrometry: a new method for acylcarnitine profiling with potential for neonatal screening for inborn errors of metabolism. In: Journal of Inherited Metabolic Disease, 13(3):321–324, 1990.
Schulze A, Lindner M, Kohlmuller D, et al. – Expanded newborn screening for inborn errors of metabolism by electrospray ionization-tandem mass spectrometry. In: Pediatrics, 111(6):1399–1406, 2003.

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