Lipoid proteinosis is a condition that results from the formation of numerous small clumps (deposits) of proteins and other molecules in various tissues throughout the body. These tiny clumps appear in the skin, upper respiratory tract, the moist tissues that line body openings such as the eyelids and the inside of the mouth (mucous membranes), and other areas.
The first symptom of this condition is usually a hoarse voice, which is due to deposits in the vocal cords. In infancy the hoarseness is expressed as a weak cry. The voice abnormalities persist throughout life and can ultimately cause difficulty speaking or complete loss of speech. Involvement of the throat, tonsils, and lips can result in breathing problems and upper respiratory tract infections. Deposits in the tongue can result in a thick and shortened tongue. They can also thicken the band of tissue that connects the tongue to the bottom of the mouth (frenulum), making it difficult to extend the tongue. The tongue may also have a smooth appearance due to damage to the taste buds.
A characteristic feature of lipoid proteinosis is the presence of multiple tiny, bead-like bumps lining the upper and lower eyelids along the lash line. These bumps are known as moniliform blepharosis. They may cause eyeball irritation or itching but generally do not impair vision.
The skin and mucous membranes are often fragile in children with lipoid proteinosis, leading to bleeding and scabbing following minor trauma. These problems often first appear in infancy in the mouth and on the face and limbs. Over time, these scabs form blisters and scars. Deposits accumulate in the skin, which causes the skin to become thickened and yellowish in color. Skin damage appears more frequently on areas that experience friction, such as the hands, elbows, knees, buttocks, and armpits. Some people with this condition have hair loss (alopecia) affecting their scalp, eyelashes, and eyebrows.
Neurologic features are also common in people with lipoid proteinosis. Affected individuals may have recurrent seizures (epilepsy) or behavioral and neurological problems, which can include headaches, aggressive behaviors, paranoia, hallucinations, short-term memory loss, and absence of fear. These features are thought to be associated with the presence of deposits and an accumulation of calcium (calcification) in areas of the brain called the temporal lobes. The temporal lobes help process hearing, speech, memory, and emotion. The brain abnormalities and neurological features do not always occur together, so the cause of the neurological features is still unclear.
Deposits can be found in some internal organs, including the stomach, a section of the small intestine called the duodenum, and the colon. The deposits in these tissues often do not cause any symptoms and may disappear over time.
Lipoid proteinosis is thought to be a rare condition; fewer than 500 cases have been described in the scientific literature. This condition occurs more frequently in certain areas of the world, including Turkey, Iran, and the Northern Cape province of South Africa.
Lipoid proteinosis is caused by mutations in the ECM1 gene. This gene provides instructions for making a protein that is found in most tissues within the extracellular matrix, which is an intricate lattice that forms in the space between cells and provides structural support. The ECM1 protein can attach (bind) to numerous structural proteins to provide strength to tissues. It is also involved in the growth and maturation (differentiation) of cells, including skin cells called keratinocytes. The ECM1 protein may also regulate the formation of blood vessels (angiogenesis).
ECM1 gene mutations that cause lipoid proteinosis result in the production of a nonfunctional protein or no protein at all. A lack of functional ECM1 protein reduces binding between ECM1 and other proteins, leading to an unstable extracellular matrix. Without adequate support from the extracellular matrix, cells in the skin and other tissues are weakened. However, the cause of the deposits in skin and other tissues is not clear. The unstable extracellular matrix may cause neighboring cells to overproduce proteins and other materials. It is possible that, as these excess substances accumulate in tissues, they create the deposits characteristic of lipoid proteinosis.
This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.
Other Names for This Condition
- Hyalinosis cutis et mucosae
- Lipid proteinosis
- Lipoid proteinosis of Urbach and Wiethe
- Lipoidosis cutis et mucosae
- Urbach-Wiethe disease
- Urbach-Wiethe lipoid proteinosis
- Urbach-Wiethe syndrome
Additional Information & Resources
Genetic Testing Information
Genetic and Rare Diseases Information Center
Catalog of Genes and Diseases from OMIM
Scientific Articles on PubMed
- Callizo M, Ibáñez-Flores N, Laue J, Cuadrado V, Graell X, Sancho JM. Eyelid lesions in lipoid proteinosis or Urbach-Wiethe disease: case report and review of the literature. Orbit. 2011 Oct;30(5):242-4. doi: 10.3109/01676830.2011.579685. Review. Citation on PubMed
- Dogramaci AC, Celik MM, Celik E, Bayarogullari H. Lipoid proteinosis in the eastern Mediterranean region of Turkey. Indian J Dermatol Venereol Leprol. 2012 May-Jun;78(3):318-22. doi: 10.4103/0378-6323.95447. Citation on PubMed
- Kabre V, Rani S, Pai KM, Kamra S. Lipoid proteinosis: A review with two case reports. Contemp Clin Dent. 2015 Apr-Jun;6(2):233-6. doi: 10.4103/0976-237X.156053. Citation on PubMed or Free article on PubMed Central
- Mcgrath JA. Lipoid proteinosis. Handb Clin Neurol. 2015;132:317-22. doi: 10.1016/B978-0-444-62702-5.00023-8. Review. Citation on PubMed
- Mondejar R, Garcia-Moreno JM, Rubio R, Solano F, Delgado M, Garcia-Bravo B, Rios-Martin JJ, Martinez-Mir A, Lucas M. Clinical and molecular study of the extracellular matrix protein 1 gene in a spanish family with lipoid proteinosis. J Clin Neurol. 2014 Jan;10(1):64-8. doi: 10.3988/jcn.2014.10.1.64. Epub 2014 Jan 6. Citation on PubMed or Free article on PubMed Central
- Nasir M, Latif A, Ajmal M, Qamar R, Naeem M, Hameed A. Molecular analysis of lipoid proteinosis: identification of a novel nonsense mutation in the ECM1 gene in a Pakistani family. Diagn Pathol. 2011 Jul 26;6:69. doi: 10.1186/1746-1596-6-69. Citation on PubMed or Free article on PubMed Central
- Nasir M, Rahman SB, Sieber CM, Mir A, Latif A, Ahmad N, Malik SA, Hameed A. Identification of recurrent c.742G>T nonsense mutation in ECM1 in Pakistani families suffering from lipoid proteinosis. Mol Biol Rep. 2014;41(4):2085-92. doi: 10.1007/s11033-014-3057-1. Epub 2014 Jan 12. Citation on PubMed
- Vahidnezhad H, Youssefian L, Uitto J. Lipoid Proteinosis. 2016 Jan 21 [updated 2021 Jul 22]. In: Adam MP, Ardinger HH, Pagon RA, Wallace SE, Bean LJH, Mirzaa G, Amemiya A, editors. GeneReviews® [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2021. Available from http://www.ncbi.nlm.nih.gov/books/NBK338540/ Citation on PubMed
- Youssefian L, Vahidnezhad H, Daneshpazhooh M, Abdollahzadeh S, Talari H, Khoshnevisan A, Chams-Davatchi C, Mobasher R, Li Q, Uitto J, Akhondzadeh S, Tabrizi M. Lipoid proteinosis: phenotypic heterogeneity in Iranian families with c.507delT mutation in ECM1. Exp Dermatol. 2015 Mar;24(3):220-2. doi: 10.1111/exd.12620. Citation on PubMed