Lipid storage myopathy, ichthyosis, and steatorrhea

Area of Science:

• Biochemistry
• Genetics
• Cell Biology

Background:

• A 41-year-old male presented with ichthyosis, ectropion, steatorrhea, and progressive proximal limb weakness.
• Clinical presentation suggested a systemic metabolic disorder affecting multiple organs.

Observation:

• Biopsies revealed abnormal lipid accumulation in muscle, liver, skin, leukocytes, and gastric mucosa.
• Lipid accumulation was pronounced in cultured skin and muscle cells, increasing with cell generations.
• Electron microscopy showed lipid globules lacking limiting membranes.

Findings:

• Thin-layer chromatography identified the stored lipid as triglyceride, with no excess cholesterol.
• Muscle carnitine concentration and carnitine palmityltransferase activity were normal.
• Leukocyte 14CO2 production from palmitate was not impaired, ruling out certain fatty acid oxidation defects.

Implications:

• The widespread triglyceride accumulation and its persistence in cell cultures indicate a genetic error in lipid metabolism.
• This case highlights a potential novel inherited metabolic disease affecting triglyceride homeostasis.
• Further research is needed to elucidate the specific genetic defect and its molecular mechanisms.