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Fatty Acid Oxidation Disorders

Fatty Acid Oxidation Disorders (FAODs) are inherited metabolic conditions caused by defects in mitochondrial β-oxidation processes. This impairment disrupts energy production while allowing toxic metabolic intermediates to accumulate. These disorders present notable diagnostic complexities and demand targeted research strategies for therapeutic development. Protheragen provides end-to-end preclinical solutions specifically designed for FAOD studies, encompassing disease mechanism modeling through comprehensive therapeutic assessment protocols.

Overview of Fatty Acid Oxidation Disorders

Fatty Acid Oxidation Disorders are autosomal recessive conditions that disrupt the body's ability to convert fats into energy, particularly during periods of fasting or increased energy demand. The clinical spectrum ranges from severe neonatal presentations to milder adult-onset forms, with manifestations including hypoketotic hypoglycemia, cardiomyopathy, skeletal myopathy, hepatic dysfunction, and sudden death.

Our services focus on the most clinically significant FAOD subtypes:

  • Medium-chain acyl-CoA dehydrogenase deficiency (MCAD): The most common FAOD, presenting with vomiting, lethargy, hepatomegaly, and life-threatening metabolic crises during catabolic stress
  • Very long-chain acyl-CoA dehydrogenase deficiency (VLCAD): Associated with cardiac and hepatic involvement in infancy or exercise-induced rhabdomyolysis in older patients
  • Long-chain 3-hydroxyacyl-CoA dehydrogenase deficiency (LCHAD): Characterized by retinopathy, peripheral neuropathy, and recurrent rhabdomyolysis
  • Carnitine palmitoyltransferase deficiencies (CPT1/CPT2): Presenting as hepatic encephalopathy (CPT1) or muscle pain and myoglobinuria (CPT2)

The complex pathophysiology of FAODs—involving energy depletion, lipotoxicity, and multi-organ dysfunction—demands specialized research models and analytical approaches that accurately recapitulate human disease mechanisms.

Fig1. Role of key enzymes in the oxidation of fatty acids in the mitochondria. (Merritt, et al., 2020)

Genetic Characteristics of FAODs

FAODs are primarily inherited in an autosomal recessive manner, meaning that an individual must inherit two copies of the defective gene (one from each parent) to develop the disorder. Genetic mutations in specific enzymes involved in fatty acid metabolism, such as ACADM for MCAD deficiency, HADHA for LCHAD deficiency, and ACADVL for VLCAD deficiency, are the underlying causes of these conditions. These mutations disrupt the normal metabolic pathways, leading to the accumulation of toxic intermediates and impaired energy production.

Fig2. Main clinical symptoms of fatty acid oxidation disorders (FAOD). (Vianey-Saban, et al., 2023)

Clinical Pain Points and Research Needs

Despite advances in newborn screening and genetic testing, FAODs remain challenging to manage due to their variable presentations and potential for severe complications. Current treatments, such as dietary modifications and carnitine supplementation, are often insufficient to prevent metabolic crises and long-term organ damage. The development of more effective therapies, including gene therapy and targeted small molecules, is crucial to improving outcomes for patients with FAODs. However, the rarity and complexity of these disorders necessitate specialized preclinical models and research tools to accelerate therapeutic development.

Our Services

Protheragen is committed to advancing research and development in amino acid metabolism defects, offering a comprehensive suite of services tailored to support the unique challenges of these disorders.

Diagnostic method development services for achondroplasia.

Genetically Engineered Animal Models

We have established a portfolio of validated FAOD animal models that faithfully mimic human disease phenotypes:

  • MCAD knockout mice: Display fasting-induced hypoglycemia, hepatic steatosis, and elevated medium-chain acylcarnitines (C6-C10), replicating human MCAD deficiency 14
  • VLCAD-/- mice: Develop cardiac hypertrophy and exercise intolerance, enabling study of therapeutic interventions for cardiomyopathy 1
  • LCHAD-deficient models: Exhibit retinal degeneration and neuropathy for investigating disease progression mechanisms 1
  • Tissue-specific conditional knockouts: For studying organ-specific manifestations (liver, muscle, heart)

All models undergo comprehensive metabolic characterization including:

  • Plasma acylcarnitine profiling by tandem mass spectrometry
  • Tissue lipidomics and metabolomics
  • Energy metabolism assessment
  • Histopathological evaluation of target organs
Therapy development services for achondroplasia.

Cellular Models and Mechanistic Studies

Our in vitro platforms enable detailed investigation of FAOD pathophysiology and drug screening:

  • Patient-derived fibroblast lines: From various FAOD subtypes, maintained in our biobank with full clinical metadata 8
  • Induced pluripotent stem cell (iPSC) models: Differentiated into hepatocytes, cardiomyocytes, and myocytes to study tissue-specific effects
  • CRISPR-engineered cell lines: With precise mutations matching clinical variants
  • Comprehensive metabolic assays:
  • Fatty acid oxidation flux analysis (radiolabeled substrates)
  • Mitochondrial function assessment (Seahorse technology)
  • Lipid droplet quantification and dynamics
  • Reactive oxygen species measurement
Therapy development services for achondroplasia.

Therapeutic Development Support

  • Small molecule evaluation:
  • Screening of candidate compounds
  • Dose-response studies in cellular and animal models
  • Pharmacokinetic/pharmacodynamic profiling
  • Gene therapy development:
  • AAV vector design and optimization
  • Biodistribution studies in relevant models
  • Long-term efficacy and safety monitoring
  • Nutritional/metabolic interventions:
  • Evaluation of modified dietary regimens
  • Assessment of carnitine supplementation strategies
  • Testing of emergency protocols for metabolic crises
Therapy development services for achondroplasia.

Our specialized metabolic analytics support all phases of FAOD research: High-resolution mass spectrometry, Tissue imaging mass spectrometry and Integrated multi-omics.

Fatty acid oxidation disorders are complex and potentially life-threatening conditions that require specialized preclinical research and development efforts. Protheragen is at the forefront of FAOD research, offering a wide range of services tailored to address the unique challenges of these disorders. By working closely with scientists and pharmaceutical companies, we aim to accelerate the development of innovative therapies and improve outcomes for patients affected by these rare metabolic disorders. If you are interested in our services or would like to collaborate on FAOD research, please contact us for more information and a detailed quote.

References

  • Merritt JL 2nd.; et al. Clinical manifestations and management of fatty acid oxidation disorders. Rev Endocr Metab Disord. 2020;21(4):479-493.
  • Vianey-Saban C.; et al. Fifty years of research on mitochondrial fatty acid oxidation disorders: The remaining challenges. J Inherit Metab Dis. 2023;46(5):848-873.

All of our services and products are intended for preclinical research use only and cannot be used to diagnose, treat or manage patients.

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