Visualizing Genetics: An Investigation of Dermoscopy as a Tool for Genetic Variant Prediction in Capillary...

Area of Science:

• Dermatology
• Genetics
• Medical Diagnostics

Background:

• Capillary malformations (CMs) are congenital vascular anomalies with diverse genetic causes.
• Accurate genetic diagnosis of CMs is crucial for treatment and counseling but can be challenging.
• Distinct dermoscopic features may correlate with specific CM genotypes.

Purpose of the Study:

• To investigate genotype-phenotype correlations in congenital capillary malformations using dermoscopy.
• To determine if dermoscopic findings can aid in the genetic diagnosis of CMs.

Main Methods:

• Retrospective cohort study of 22 patients with genetically confirmed CMs.
• Analysis of polarized dermoscopic images for specific vascular and structural features.
• Categorization of dermoscopic features by gene mutation (EPHB4, GNA11/GNAQ, PIK3CA/PIK3R1, RASA1).

Main Results:

• EPHB4-CMs showed branching vessels.
• RASA1-CMs presented with color but lacked visible vessels.
• GNA11/GNAQ-CMs displayed widthwise vessel cross-sections without branching.
• PIK3CA-CMs exhibited purple lacunae (lymphatic component) or varied presentations.

Conclusions:

• Distinct dermoscopic features correlate with specific CM genotypes.
• Dermoscopy can assist in narrowing differential diagnoses for CMs.
• Dermoscopy shows potential to guide genetic testing and interpret variants of uncertain significance (VUS).