Msx1 expression regulation by its own antisense RNA: consequence on tooth development and bone regeneration

Area of Science:

• Genetics
• Developmental Biology
• Molecular Biology

Background:

• Msx homeogenes, particularly Msx1, are crucial for dental and craniofacial development.
• Msx1 is expressed in adult bone, but its function in this tissue remains largely unknown.
• Bidirectional transcription of Msx1 generates both sense (S) and antisense (AS) long noncoding RNAs.

Purpose of the Study:

• To investigate the relationship between Msx1 sense and antisense RNAs.
• To explore the role of Msx1 RNAs in adult bone tissue.
• To determine if Msx1 RNA dysregulation is linked to bone homeostasis disturbances.

Main Methods:

• In vivo mapping of Msx1 S and AS RNAs in adult mice.
• In vitro experiments assessing the effect of Msx1 AS RNA on Msx1 S expression and protein localization.
• Analysis of gene expression changes (Dlx5, Bmp4) in response to Msx1 RNA modulation.

Main Results:

• Both Msx1 S and AS RNAs were detected in adult mouse bone tissue.
• Msx1 AS RNA reduced endogenous Msx1 S expression and altered Msx1 protein distribution in vitro.
• Msx1 AS RNA was shown to modulate Msx1 function, affecting Dlx5 and Bmp4 expression.

Conclusions:

• Msx1 S and AS RNAs exhibit specific expression patterns and interact functionally.
• Msx1 AS RNA can regulate Msx1 gene expression and protein localization.
• These findings suggest a significant involvement of Msx1 in alveolar bone biology and potential implications for bone loss and tooth agenesis.