Mimicking Darier Disease In Vitro: A Human Epidermal Organoid Approach.

Area of Science:

• Dermatology
• Genetics
• Cell Biology

Background:

• Darier disease (DD) is a rare genetic disorder linked to ATP2A2 gene mutations.
• Calcium dysregulation and poor keratinocyte adhesion are hallmarks of DD.
• Limited availability of disease models hinders understanding of DD's molecular mechanisms.

Purpose of the Study:

• To develop and validate a human epidermal organoid model for studying Darier disease.
• To investigate the molecular and phenotypic characteristics of DD using this novel model.
• To establish a platform for personalized drug screening in Darier disease.

Main Methods:

• Generation of human epidermal organoids from Darier disease patient keratinocytes.
• Analysis of acantholysis, desmosomal protein localization, and epidermal barrier function.
• Transcriptomic profiling to identify molecular pathways affected in DD organoids.

Main Results:

• The DD organoid model successfully recapitulated key pathological features of Darier disease, including acantholysis and desmosomal dysfunction.
• Mislocalization of desmosomal proteins was observed in the DD organoids.
• Transcriptomic analysis revealed significant perturbations in pathways related to epidermal development, cell adhesion, and keratinocyte differentiation.

Conclusions:

• Human epidermal organoids derived from DD patients represent a valuable and effective model for studying Darier disease.
• This model provides a unique platform for investigating the complex molecular pathology of DD.
• The developed organoid system holds promise for personalized drug screening and therapeutic development for Darier disease.