Arab Board Dermatology Final

Practice session

An infant is evaluated for generalized erythroderma with serpiginous, migratory polycyclic scaling plaques with double-edged scale (ichthyosis linearis circumflexa), extreme atopy, and brittle lusterless hair. Microscopic hair mount reveals 'bamboo hair' (trichorrhexis invaginata). What gene is mutated in this syndrome?

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