Molecular Genetics and Clinical Manifestations of Lipoid Proteinosis

Lipoid proteinosis is a rare autosomal recessive genodermatosis caused by biallelic mutations in the extracellular matrix protein 1 (ECM1) gene. ECM1 encodes a secreted glycoprotein that contributes to dermal structural integrity, basement membrane maintenance and regulation of collagen fibrillogenesis. Loss-of-function variants in ECM1 lead to progressive deposition of PAS-positive hyaline material in the skin, mucous membranes and multiple internal organs. Clinically, the disorder typically presents in early childhood with hoarseness of voice due to laryngeal infiltration, characteristic skin thickening, yellowish papules along the eyelid margins (moniliform blepharosis) and scarring of traumatised sites. Neurological involvement may include bilateral calcifications within the amygdala and hippocampal regions, giving rise to variable neuropsychiatric symptoms, seizures or memory disturbances. Ultrastructural studies have demonstrated abnormal fibrillar clusters adherent to elastic and collagen fibres, while histopathology consistently shows dermal hyaline deposits with disruption of basement membranes. Phenotypic severity varies widely even among individuals carrying similar ECM1 mutations, reflecting complex genotype–phenotype correlations. Current management remains largely supportive, including voice therapy, retinoid trials and multidisciplinary care, although advances in molecular diagnostics now enable rapid identification of novel alleles and carrier screening in consanguineous populations.

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Molecular Genetics and Clinical Manifestations of Lipoid Proteinosis publication trend

The graph below shows the total number of articles in molecular genetics and clinical manifestations of lipoid proteinosis across all publications each year (not limited to Nature Index journals).

Technical terms

Autosomal recessive: Inheritance pattern requiring two mutated gene copies for disease manifestation.

Extracellular matrix protein 1 (ECM1): A secreted glycoprotein crucial for skin structure and basement membrane cohesion.

Nonsense mutation: A point mutation that introduces a premature stop codon, truncating the protein.

Periodic acid–Schiff (PAS) staining: A histochemical stain that highlights polysaccharides and glycoprotein deposits in tissues.

Calcification: Pathological deposition of calcium salts within soft tissues, visible on radiological imaging.

References

1. Acitretin Treatment for Lipoid Proteinosis. Case Reports in Dermatological Medicine (2012).
2. Lipoid Proteinosis: Identification of a Novel Nonsense Mutation c.1246C>T:p.R416X in ECM1 gene from Bangladesh:. Pakistan Journal of Medical Sciences (2023).
3. A Rare Case of Lipoid Proteinosis in a Patient Presenting With Seizures: A Case Report and Literature Review. Cureus (2024).
4. Ultrastructural aspects of the skin in lipoid proteinosis (Urbach-Wiethe disease). Anais Brasileiros de Dermatologia (2021).