Erythrokeratodermia Variabilis
- Author: Gabriele Richard, MD; Chief Editor: Dirk M Elston, MD more...
Background
Erythrokeratodermia variabilis (EKV) is a rare genetic skin disorder listed in Online Mendelian Inheritance in Man (OMIM) # 133200. Erythrokeratodermia variabilis belongs to the clinically and genetically heterogeneous group of erythrokeratodermas.
Erythrokeratodermia variabilis is characterized by the coexistence of 2 distinct morphologic features: hyperkeratosis and transient erythema. de Buy Wenninger recognized and described the first cases of erythrokeratodermia variabilis in the Netherlands in 1907.[1] In 1925, Mendes da Costa presented a detailed clinical description of the disease in a mother and daughter, reviewed 8 similar cases that were previously published, and coined the name "erythro- et keratodermia variabilis."[2] During the next decades, multiple case reports emerged in the Northern European literature, including a study of 33 affected members of a Dutch family and 29 affected persons in 5 generations of a Swiss family.[3] In 1964, Barsky and Bernstein reported the first case in the American literature.[4]
Pathophysiology
Erythrokeratodermia variabilis is an inherited disorder of cornification associated with noninflammatory erythema. Marked hyperkeratosis is present, probably because of an increased proliferation and disturbed differentiation of keratinocytes.
In approximately two thirds of erythrokeratodermia variabilis patients, mutations have been identified in 2 connexin genes, GJB3 encoding connexin-31 and GJB4 encoding connexin-30.3. Connexins are a family of transmembrane proteins that assemble into hexameric hemichannels and form gated intercellular gap junction channels. The finding of mutations in GJB3 and GJB4 suggests that the clinical manifestations of erythrokeratodermia variabilis are caused by impaired gap junctional intercellular communication or hemichannel function due to a dominant effect of mutant gap junction proteins.[5, 6]
Epidemiology
Frequency
United States
Erythrokeratodermia variabilis is rare, and its accurate prevalence is not known. More than 200 cases are reported in patients with diverse genetic backgrounds. Fifty-four affected individuals from 16 families were known to the author in the United States in 2004.
Mortality/Morbidity
Erythrokeratodermia variabilis is a chronic skin disorder without other organ manifestations; patients have a normal life expectancy. Depending on the extent and severity of erythrokeratodermia variabilis, the skin lesions can be severely disfiguring and have a tremendous psychosocial effect on the patients. Generalized hyperkeratosis may be associated with heat intolerance.
Race
Erythrokeratodermia variabilis has been reported worldwide. Most cases were whites of northern and middle European origin, but erythrokeratodermia variabilis also occurs in African Americans and Asians.
Sex
Both sexes are affected equally.
Age
More than 50% of patients present with symptoms at birth or in the neonatal period. Approximately 90% of patients present with EKV within the first year of life. In general, onset of disease is earlier in individuals with severe disease, including generalized hyperkeratosis.
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