Darier disease: a guide to the physician.

Area of Science:

• Genetics
• Dermatology
• Cell Biology

Background:

• Darier disease is an autosomal dominant skin disorder characterized by keratotic papules.
• It results from mutations in the ATP2A2 gene, which encodes the sarco/endoplasmic reticulum Ca2+ ATPase isoform 2 (SERCA2 protein).
• SERCA pumps are crucial for maintaining low cytosolic calcium (Ca2+) levels by transporting Ca2+ into the sarco/endoplasmic reticulum.

Purpose of the Study:

• To investigate the genetic basis of Darier disease.
• To understand the role of ATP2A2 mutations and intracellular calcium homeostasis in disease presentation.
• To explore potential compensatory mechanisms contributing to phenotypic variability.

Main Methods:

• Analysis of ATP2A2 gene mutations in Darier disease patients.
• Review of existing literature on SERCA pump function and calcium regulation in epithelial cells.
• Examination of phenotypic variations and potential genetic or cellular compensation strategies.

Main Results:

• Ninety-two distinct ATP2A2 mutations have been identified in Darier disease patients, with no specific mutation hotspot.
• Significant phenotypic variability exists within and between families affected by Darier disease.
• Potential compensatory mechanisms include increased expression of the normal ATP2A2 allele or compensation by other SERCA pumps (SERCA1, SERCA3).

Conclusions:

• ATP2A2 mutations are the cause of Darier disease, impacting calcium transport.
• Intracellular calcium homeostasis and SERCA pump activity are critical for skin health.
• Phenotypic variability may be influenced by compensatory mechanisms regulating intracellular calcium levels.