Leukonychia totalis

What causes leukonychia totalis?

Leukonychia totalis (also called total leukonychia) is thought to be due to abnormal keratinization (conversion into keratin) of the nail plate. Keratin is a protein that is a major component of the epidermis (outer layer of skin), hair, nails, and horny tissues.

The condition is usually inherited, following either an autosomal dominant or autosomal recessive inheritance pattern. These inherited forms can be caused by mutations in the PLCD1 gene.

In some cases, leukonychia occurs in association with other underlying abnormalities or syndromes. Conditions that have been reported include palmoplantar keratoderma; certain types of cysts; severe keratosis pilaris; pili torti; hypotrichosis (lack of hair growth); onychorrhexis (brittle nails); koilonychia (spoon-shaped nails); Bart-Pumphrey syndrome; and Buschkell-Gorlin syndrome, when it occurs with sebaceous cysts and kidney stones. It has also reportedly been associated with typhoid fever, leprosy, cirrhosis, nail biting, trichinosis, and cytotoxic drugs (drugs that are toxic to cells). In a few cases, the cause of leukonychia is unknown (idiopathic).

Last updated on 05-01-20

Is leukonychia totalis inherited?

Leukonychia totalis can be inherited in either an autosomal dominant or autosomal recessive manner. It may also occur as part of various underlying conditions or abnormalities, some of which have their own specific genetic cause(s) and inheritance patterns. In some cases, the condition is idiopathic (of unknown cause).

Autosomal dominant inheritance means that having a change (mutation) in only one copy of the disease-causing gene is enough to cause signs or symptoms. When a person with an autosomal dominant condition has children, each child has a 50% (1 in 2) risk to inherit the mutated copy of the gene.

Autsomal recessive inheritance means that a person must have mutations in both copies of the disease-causing gene to have the condition. Usually, one mutated copy is inherited from each parent, who are each referred to as a carrier. Carriers of an autosomal recessive condition typically do not have any signs or symptoms.

Last updated on 05-01-20

How might leukonychia totalis be treated?

There is no universally successful treatment for the whitening of the nails in people with leukonychia totalis. However, if the condition is known to have an underlying cause, treating that cause (when possible) may improve the condition.

Last updated on 05-01-20

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The RareGuru disease database is regularly updated using data generously provided by GARD, the United States Genetic and Rare Disease Information Center.

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