Ichthyosis follicularis-alopecia-photophobia syndrome

Ichthyosis follicularis-alopecia-photophobia syndrome (IFAP syndrome), also known as ichthyosis follicularis with atrichia and photophobia, is a rare genetic disorder characterized by a triad of distinctive features: ichthyosis follicularis (widespread spiny follicular hyperkeratosis affecting the skin), alopecia (absence or severe reduction of hair from birth), and photophobia (extreme sensitivity to light). The condition primarily affects the skin, hair, and eyes. The ichthyosis follicularis manifests as non-inflammatory keratotic projections arising from hair follicles distributed over most of the body, giving the skin a rough, thorn-like texture. The alopecia is typically universal or near-universal, affecting the scalp, eyebrows, eyelashes, and body hair. Photophobia can be severe and is often associated with corneal and other ocular abnormalities. Additional features may include short stature, intellectual disability, seizures, recurrent infections, and various other ectodermal abnormalities such as nail dystrophy and dental anomalies. Some patients may also develop psoriasiform dermatitis, angular cheilitis, and eczema. The condition is caused by mutations in the MBTPS2 gene located on the X chromosome, which encodes a membrane-bound transcription factor protease involved in cholesterol homeostasis and endoplasmic reticulum stress response. The disease predominantly affects males, while carrier females may show variable, often milder manifestations. There is currently no cure for IFAP syndrome. Treatment is symptomatic and supportive, focusing on management of skin symptoms with emollients and keratolytic agents, protection of the eyes from light exposure using tinted lenses or sunglasses, and addressing associated complications such as seizures or infections. A multidisciplinary approach involving dermatology, ophthalmology, neurology, and genetics is recommended for optimal patient care.

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