Researchers Uncover PAX3 Protein's Role in Cancer Development

The multi-faceted transcription factor plays key roles in both development and disease, according to new review.

Mar. 19, 2026 at 2:00am

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Researchers have conducted a comprehensive review of the Paired Box 3 (PAX3) protein, which plays a critical role in the formation of tissues and organs during embryonic development and can positively or negatively regulate gene expression. The review found that PAX3 is essential for the development of nerves, muscles, and melanocytes in embryos, and also maintains adult tissues in stem cells. However, in some cancers such as muscle tumors and melanoma, PAX3 is present at abnormally high levels and promotes tumor progression.

Why it matters

Understanding the role of PAX3 in normal and pathological cells could provide insights into potential therapies for tissue regeneration or blocking tumor growth. PAX3 function may be promoted in regenerating cells for stem cell therapy, or inhibited when these cells grow out of control in cancer.

The details

The researchers performed an overview of the literature and recent findings on PAX3, reviewing its structure, post-translational modifications, regulation of expression, transcriptional targets, and binding partners in normal development and mature tissues. They also studied PAX3's role in Waardenburg Syndrome, melanoma, alveolar rhabdomyosarcoma, and neuroblastoma.

  • The review was published on March 19, 2026.

The players

Deborah Lang

The corresponding author of the review, an associate professor of dermatology at Boston University Chobanian & Avedisian School of Medicine.

Boston University

The institution where the research was conducted and the review was published.

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What they’re saying

“PAX3 is a dynamic and multi-faceted transcription factor that plays numerous roles in both development and disease, underscoring the importance of improving our understanding of this vital factor.”

— Deborah Lang, Associate Professor of Dermatology

What’s next

The researchers suggest that further understanding of PAX3's role in normal and pathological cells could provide insights into potential therapies for tissue regeneration or blocking tumor growth.

The takeaway

This review highlights the critical and multi-faceted role of the PAX3 protein in both embryonic development and cancer progression, underscoring the importance of continued research to uncover the mechanisms by which this transcription factor controls such a wide array of key cellular functions.