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Cell trafficking disorders (CTD) are genetic defects impacting complex molecules, often misdiagnosed. Recognizing CTD as a distinct group is crucial for accurate diagnosis and treatment of these multisystem inherited metabolic diseases.

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Area of Science:

  • Biochemistry
  • Genetics
  • Immunology

Background:

  • Cell trafficking disorders (CTD) represent the largest category of inborn errors of metabolism (IEM), stemming from genetic defects in complex molecules.
  • They are often overlooked as isolated rare diseases rather than a cohesive group, particularly by non-metabolic specialists.
  • Complex lipid metabolism is intrinsically linked to cell trafficking and organelle interactions at membrane contact sites.

Purpose of the Study:

  • To highlight cell trafficking disorders (CTD) as a significant and under-recognized category of inborn errors of metabolism (IEM).
  • To emphasize the characteristic multisystemic manifestations of CTD, including neurological and immune system involvement.
  • To discuss the diagnostic challenges and limited biomarkers associated with CTD.

Main Methods:

  • Review of genetic defects affecting complex molecules and cell trafficking pathways.
  • Analysis of clinical presentations, including multisystem manifestations and neurological involvement.
  • Comparison of CTD with other inborn errors of metabolism (IEM) such as mitochondrial, peroxisomal, lysosomal disorders, CDG, and autophagy disorders.

Main Results:

  • CTD involve mutations in over 370 genes, impacting complex lipid metabolism and organelle interactions.
  • Clinical features are diverse, affecting multiple organ systems and mimicking other IEMs; neurological and immune system involvement are particularly characteristic.
  • Most CTD are progressive, may present with metabolic crises, and are typically diagnosed via exome sequencing, with few available biomarkers.

Conclusions:

  • Cell trafficking disorders (CTD) constitute a major, yet underappreciated, category of inborn errors of metabolism (IEM) requiring broader recognition.
  • The multisystemic nature and unique immune system involvement in CTD necessitate specialized diagnostic approaches.
  • Further research into biomarkers and diagnostic strategies is essential for improved management of CTD.