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Mal de Meleda (MDM)

Mal de Meleda (MDM) 



Overview

Mal de Meleda (MDM) is a rare, inherited autosomal recessive skin disorder characterized by severe, progressive thickening of the skin on the palms and soles (palmoplantar keratoderma), often spreading to the wrists and ankles. It appears in infancy, often with sharply defined, waxy yellow-brown plaques, and is typically managed with oral retinoids.

Symptoms

Palmoplantar Keratoderma: The skin on the palms of the hands and soles of the feet becomes diffusely thick, hard, waxy, and yellowish.

Transgredient Spread: The keratoderma often spreads to the back of the hands and feet (dorsum), wrists, ankles, and lower forearms in a "glove and stocking" distribution.

Erythema (Redness): Affected areas are often surrounded by a sharp, clearly demarcated red, scaly border.

Plaques on Joints: Thickened, scaly, and rough plaques frequently appear on the elbows, knees, and knuckles.

Causes

Protein Function: The \(SLURP1\) gene provides instructions for producing the SLURP-1 protein, which acts as a regulator in the skin.

Cell Signaling: SLURP-1 interacts with nicotinic acetylcholine receptors in the skin to help control the growth, maturation, and death (apoptosis) of skin cells.

Mutation Impact: Pathogenic variants (mutations) in this gene—such as missense, nonsense, or splicing mutations—result in little to no functional SLURP-1 protein.

The Result: The lack of functional SLURP-1 disrupts normal skin cell turnover and inflammation control. This leads to the buildup of excess skin cells and subsequent hyperkeratosis (thickening of the skin).

Diagnosis

Clinical Evaluation: Doctors look for diffuse, waxy, and thickened skin on the palms and soles that develops shortly after birth. A hallmark feature is the extension of this hyperkeratosis onto the dorsal (top) surfaces of the hands and feet.

History: A careful family history, often highlighting consanguinity (closely related parents), is common because of the recessive inheritance pattern.

Genetic Testing: The gold standard for confirming Mal de Meleda is identifying homozygous or compound heterozygous mutations in the \(SLURP1\) gene.

Histopathology: Skin biopsies can be used, which typically show pronounced thickening of the stratum corneum, hypergranulosis, and acanthosis, although they are not specific enough for a standalone diagnosis

Treatment

Oral Retinoids: These are the mainstay of treatment to reduce hyperkeratosis (skin thickening).Acitretin: Frequently used at low doses (e.g., \(10\) to \(20\text{ mg/day}\)). It helps regulate skin growth, though long-term use requires monitoring for liver toxicity.

Alitretinoin:

Keratolytics: Urea-based lotions and salicylic acid are applied to soften thickened skin, making mechanical debridement (removal) easier.

Antimicrobials: Because Mal de Meleda often causes foul odor and creates an environment prone to bacterial and fungal superinfections, regular cleansing with antibacterial washes or potassium permanganate (Condy's solution) followed by topical antifungals is essential.

Type of Doctor Department : A dermatologist

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