Meta-Analysis of Gene Expression Reveals the Core Transcriptomic Profile of Lesional Scalp in Alopecia Areata

    August 2025 in “ Dermatology and Therapy ”
    Irene Rivera‐Ruiz, Jesús Gay-Mimbrera, Pedro Jesús Gómez‐Arias, Macarena Aguilar-Luque, M. Juan-Cencerrado, Carmen Mochón‐Jiménez, Esmeralda Parra-Peralbo, Beatriz Isla-Tejera, Francisco Gómez‐García, Juan Ruano
    This study conducted a meta-analysis of gene expression data from 132 samples (82 patients with alopecia areata and 50 controls) to establish a comprehensive molecular signature of lesional scalp in alopecia areata. The analysis identified 5109 differentially expressed genes (DEGs), with 2710 upregulated and 2399 downregulated, significantly more than the 120 DEGs shared across the five studies analyzed. Key findings include consistently expressed genes such as CXCL9, CCL18, and CXCL10, and highlighted pathways involving chemokines/receptors and markers of cytotoxic T lymphocytes and NK cells. Downregulated genes were related to keratins and proteins crucial for hair follicle structure. The study also found enrichment in Th1, Th2, and Th17 pathways, particularly through JAK-STAT signaling, providing new insights into alopecia areata's pathogenesis and potential treatment targets.
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