Incontinentia pigmenti
What is it?
Incontinentia pigmenti is a rare X-linked dominant genetic disorder that affects the skin, hair, teeth, nails and central nervous system. It is named from its appearance under a microscope.
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Incontinentia pigmenti.
Additional names
This group contains additional names:
- IP
Signs & symptoms
The disease is characterized by skin abnormalities that begin in childhood, usually a blistering rash which heals, followed by the development of harder skin growths. The skin may develop grey or brown patches which fade with time. Other symptoms can include hair loss, dental abnormalities, eye abnormalities that can lead to vision loss and lined or pitted fingernails and toenails. Associated problems can include delayed development, intellectual disability, seizures and other neurological problems. Most males with the disease do not survive to childbirth.
Diagnosis
The diagnosis of IP is established by clinical findings and occasionally by corroborative skin biopsy. Molecular genetic testing of the NEMO IKBKG gene (chromosomal locus Xq28) reveals disease-causing mutations in about 80% of probands. Such testing is available clinically. In addition, females with IP have skewed X-chromosome inactivation; testing for this can be used to support the diagnosis. Many people in the past were misdiagnosed with a second type of IP, formerly known as IP1. This has now been given its own name: 'Hypomelanosis of Ito' (incontinentia pigmenti achromians). This has a slightly different presentation: swirls or streaks of hypopigmentation and depigmentation. It is not inherited and does not involve skin stages 1 or 2. Some 33–50% of patients have multisystem involvement-eye, skeletal, and neurological abnormalities. Its chromosomal locus is at Xp11, rather than Xq28
Treatment
There does not yet exist a specific treatment for IP. Treatment can only address the individual symptoms
☝️ This is not a substitute for professional medical advice. Please consult with your physician before making any medical decision.
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