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X-linked ichthyosis (abbreviated XLI) is a skin condition caused by the hereditary deficiency of the steroid sulfatase (STS) enzyme that affects 1 in 2000 to 1 in 6000 males. [2] XLI manifests with dry, scaly skin [ 3 ] and is due to deletions [ 4 ] [ 5 ] or mutations [ 6 ] in the STS gene.
Ichthyosis (also named fish scale disease) [1] is a family of genetic skin disorders characterized by dry, thickened, scaly skin. [2] The more than 20 types of ichthyosis range in severity of symptoms, outward appearance, underlying genetic cause and mode of inheritance (e.g., dominant, recessive, autosomal or X-linked). [3]
Ichthyosis follicularis, alopecia, and photophobia (IFAP) syndrome is an extremely rare genetic syndrome caused by mutations in the MBTPS2 gene. [ 2 ] : 564 It is extremely rare: there were only 40 known cases (all male) until 2011.
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A congenital deficiency in the enzyme is associated with X-linked ichthyosis, a scaly-skin disease affecting roughly 1 in every 2,000 to 6,000 males. [7] [8] The excessive skin scaling and hyperkeratosis is caused by a lack of breakdown and thus accumulation of cholesterol sulfate, a steroid that stabilizes cell membranes and adds cohesion, in the outer layers of the skin.
Most cases are caused by mutations in the EDA gene, which are inherited in an X-linked recessive pattern, called x-linked hypohidrotic ectodermal dysplasia (XLHED). A condition is considered X-linked if the mutated gene that causes the disorder is located on the X chromosome, one of the two sex chromosomes.
A child with Harlequin-type ichthyosis. Visible plates on the skin and changes in the appearance of the ears and fingers, are symptoms of Harlequin-type ichthyosis. [10] Newborns with harlequin-type ichthyosis present with thick, fissured armor-plate hyperkeratosis. [11] Sufferers feature severe cranial and facial deformities.
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