CONTINUING MEDICAL EDUCATION Incontinentia pigmenti: A review and update on the molecular basis of pathophysiology

Incontinentia pigmenti is an uncommon X-linked dominant disorder, lethal in the majority of affected males in utero and variably expressed in females. Cutaneous manifestations are classically subdivided into 4 stages: vesicular, verrucous, hyperpigmented, and atrophic. Various hair and nail abnormalities, dental anomalies, and ophthalmologic and neurologic deficits are associated with the disorder. The gene for incontinentia pigmenti has been mapped to Xq28. Recently, mutations in the NEMO/IKK gene located at Xq28 have been found to cause expression of the disease. Knockout mice heterozygous for NEMO/IKK gene deficiency develop a clinical phenotype very similar to that of incontinentia pigmenti. NEMO/IKK is an essential component of the newly discovered nuclear factor B (NF-B) signaling pathway. When activated, NF-B controls the expression of multiple genes, including cytokines and chemokines, and protects cells against apoptosis. The mechanism by which NEMO/IKK deficiency causes, via the NF-B pathway, the phenotypical expression of the disease has recently been elucidated. In addition, the newest research findings on eosinophil recruitment through eotaxin release by activated keratinocytes are de-scribed in the review. Finally, anhidrotic ectodermal dysplasia with immunodeficiency, a disorder allelic to incontinentia pigmenti, is discussed together with implications on the current understanding of NF-B function. (J Am Acad Dermatol 2002;47:169-87.