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Updated: Dec 31, 2025
Analysis of Neural Crest Migration and Differentiation by Cross-species Transplantation
Published on: February 7, 2012
ADAR1 mediated regulation of neural crest derived melanocytes and Schwann cell development
Nadjet Gacem1,2, Anthula Kavo2,3, Lisa Zerad1
1Laboratory of Embryology and Genetics of Human Malformation, Imagine Institute, INSERM UMR 1163, Universite Paris Descartes-Universite de Paris, Paris, France.
Abstract:
The neural crest gives rise to numerous cell types, dysfunction of which contributes to many disorders. Here, we report that adenosine deaminase acting on RNA (ADAR1), responsible for adenosine-to-inosine editing of RNA, is required for regulating the development of two neural crest derivatives: melanocytes and Schwann cells. Neural crest specific conditional deletion of Adar1 in mice leads to global depigmentation and absence of myelin from peripheral nerves, resulting from alterations in melanocyte survival and differentiation of Schwann cells, respectively. Upregulation of interferon stimulated genes precedes these defects, which are associated with the triggering of a signature resembling response to injury in peripheral nerves. Simultaneous extinction of MDA5, a key sensor of unedited RNA, rescues both melanocytes and myelin defects in vitro, suggesting that ADAR1 safeguards neural crest derivatives from aberrant MDA5-mediated interferon production. We thus extend the landscape of ADAR1 function to the fields of neural crest development and disease.
Insights
Adenosine deaminase acting on RNA (ADAR1) is crucial for neural crest development. Its absence causes depigmentation and myelin defects by triggering an injury response, highlighting ADAR1
Area of Science:
- Developmental Biology
- Neuroscience
- RNA Biology
Background:
- The neural crest is a transient embryonic structure that generates diverse cell types.
- Dysregulation in neural crest development is linked to various human disorders.
- Adenosine deaminase acting on RNA (ADAR1) modifies RNA and is essential in cellular processes.
Purpose of the Study:
- To investigate the role of ADAR1 in neural crest development.
- To understand the molecular mechanisms underlying ADAR1's function in neural crest derivatives.
- To explore the implications of ADAR1 dysfunction in neural crest-related diseases.
Main Methods:
- Conditional deletion of Adar1 in neural crest cells of mice.
- Analysis of melanocyte survival and differentiation.
- Assessment of Schwann cell myelination.
- Gene expression analysis of interferon-stimulated genes.
- In vitro experiments involving MDA5 inhibition.
Main Results:
- Conditional deletion of Adar1 in neural crest cells led to global depigmentation and lack of peripheral nerve myelin.
- These defects were associated with impaired melanocyte survival and Schwann cell differentiation.
- Upregulation of interferon-stimulated genes and an "injury response" signature were observed.
- Inhibition of MDA5 rescued melanocyte and myelin defects in vitro.
Conclusions:
- ADAR1 is essential for the proper development and maintenance of melanocytes and Schwann cells.
- ADAR1 prevents aberrant MDA5-mediated interferon production, safeguarding neural crest derivatives.
- This study expands the known functions of ADAR1 to neural crest development and associated diseases.
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