Fatty Aldehyde Metabolism in Genetic Disorders

Fatty aldehyde metabolism centres on the enzymatic conversion of long-chain fatty alcohols into fatty acids via intermediate aldehydes. In healthy cells, fatty alcohols are oxidised to fatty aldehydes by fatty alcohol:NAD+ oxidoreductase and subsequently converted to fatty acids by fatty aldehyde dehydrogenase (FALDH). Genetic defects affecting these enzymes lead to the accumulation of fatty aldehydes and alcohols, which are cytotoxic and disrupt membrane lipid composition. Sjögren-Larsson syndrome (SLS) exemplifies such a disorder, arising from autosomal recessive mutations in the ALDH3A2 gene encoding FALDH. Biochemical hallmarks include elevated levels of long-chain fatty alcohols and ether lipids in skin, plasma and brain tissues, contributing to ichthyosis, spasticity and intellectual disability. Beyond SLS, emerging evidence implicates perturbed fatty aldehyde detoxification in broader neurodegenerative and dermatological conditions. Advances in analytical techniques such as lipidomics and imaging mass spectrometry have elucidated the spatial distribution of lipid metabolites within affected tissues, revealing how aldehyde accumulation interferes with myelin integrity and keratinocyte differentiation. Therapeutic strategies under exploration include small-molecule chaperones to restore residual enzyme function, gene therapy approaches to correct ALDH3A2 variants and dietary modulation of lipid precursors. Understanding fatty aldehyde metabolism not only informs the management of rare inherited disorders but also sheds light on the roles of aldehyde stress in common age-related and inflammatory diseases.

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Fatty Aldehyde Metabolism in Genetic Disorders publication trend

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Technical terms

Fatty aldehyde dehydrogenase (FALDH): Mitochondrial enzyme converting long-chain fatty aldehydes into corresponding fatty acids, encoded by ALDH3A2.

Fatty alcohols: Long-chain aliphatic alcohols derived from lipid metabolism, which require oxidation to prevent toxic accumulation.

Ether lipids: Class of lipids featuring an ether bond at the sn-1 position, important for membrane structure and neural function; accumulation reflects metabolic imbalance.

Lipidomics: Large-scale analytical approach to characterise and quantify lipid species in biological samples, often using mass spectrometry.

Sjögren-Larsson syndrome (SLS): Rare autosomal recessive disorder caused by FALDH deficiency, manifesting with ichthyosis, spastic diplegia and intellectual impairment.

References

1. Disturbed brain ether lipid metabolism and histology in Sjögren‐Larsson syndrome. Journal of Inherited Metabolic Disease (2020).
2. Sjögren–Larsson syndrome: accumulation of free fatty alcohols in cultured fibroblasts and plasma. Journal of Lipid Research (2000).
3. Abnormal fatty alcohol metabolism in cultured keratinocytes from patients with Sjögren-Larsson syndrome. Journal of Lipid Research (2007).
4. Discovery of novel diagnostic biomarkers for Sjögren-Larsson syndrome by untargeted lipidomics. Biochimica et Biophysica Acta (BBA) - Molecular and Cell Biology of Lipids (2024).
5. Sjogren-Larsson syndrome brain volumetric reductions demonstrated with an automated software. Arquivos de Neuro-Psiquiatria (2023).