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This review discusses recent advancements made in using mouse models to investigate the genetic complexity and pathogenesis of alopecia areata, emphasizing potential new treatment targets, but it reports no new findings.

In a mouse model study, researchers found that mutations in Aire reduced alopecia areata frequency, while Notch4 mutations did not lead to the disease, likely due to proximity with a resistance gene.

The researchers reported that dsRNA from damaged skin activates TLR3, promoting hair follicle regeneration, while TLR3-deficient animals fail to initiate this process, suggesting potential therapeutic approaches for hair neogenesis.

This study found that skin microbiota, particularly in wild-type mice, promotes wound-induced hair follicle neogenesis and wound healing, highlighting the potential downsides of routine antibiotic use on skin regeneration.

The researchers reported that hair follicle development and commensal microbe colonization promote the accumulation of regulatory T cells in neonatal skin, with the Ccl20-Ccr6 pathway playing a key role in this process.