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Sox9 Is Required for Nail-Bed Differentiation and Digit-Tip Regeneration
Miguel Lao1, Alicia Hurtado2, Alejandro Chacón de Castro1
1Laboratories 127 and a105, Department of Genetics and Biotechnology Institute, Center for Biomedical Research, University of Granada, Avenida del Conocimiento S/N, Armilla, Granada, Spain.
The Journal of Investigative Dermatology
|April 10, 2022
Summary
The transcription factor Sox9 is crucial for nail growth and digit regeneration. Its absence causes abnormal nail growth and impaired regeneration in mice.
Area of Science:
- Developmental Biology
- Regenerative Medicine
- Mammalian Anatomy
Background:
- The nail organ is a complex structure essential for digit function and regeneration.
- Understanding the molecular mechanisms of nail growth and digit tip regeneration is vital for treating related diseases and injuries.
Purpose of the Study:
- To investigate the role of the transcription factor Sox9 in nail organ homeostasis and digit tip regeneration.
- To identify Sox9-expressing cell populations and their contribution to nail growth and regeneration.
Main Methods:
- Utilized mouse models with Sox9 knockout.
- Employed genetic lineage tracing to track Sox9-expressing cells.
- Analyzed nail morphology, cell differentiation, and digit regeneration capacity.
Main Results:
- Sox9 is expressed in nail bed stem cells and basal epidermal layers of the digit tip.
- Sox9 deficiency leads to nail matrix stem cell differentiation failure, resulting in abnormal nail overgrowth.
- Sox9 knockout mice exhibit compromised digit tip regeneration.
- Sox9 plays a role in maintaining the hyponychium epidermis.
Conclusions:
- Sox9 is essential for proper nail growth by regulating nail matrix stem cell differentiation.
- Sox9 is critical for digit tip regeneration in mammals.
- Findings provide insights into nail diseases and potential therapeutic strategies for regeneration.
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