Long noncoding RNA Neat1 modulates myogenesis by recruiting Ezh2.

Area of Science:

• Molecular Biology
• Cell Biology
• Developmental Biology

Background:

• Nuclear Enriched Abundant Transcript 1 (Neat1) is known for its role in cell proliferation, particularly in cancer.
• The function of Neat1 in myogenesis (muscle formation) remains largely unexplored.

Purpose of the Study:

• To investigate the role of Neat1 in muscle cell formation and regeneration.
• To elucidate the molecular mechanisms by which Neat1 regulates myogenesis.

Main Methods:

• Gain- and loss-of-function studies were performed in C2C12 myoblast cell line.
• In vivo studies involving Neat1 knockdown were conducted.
• Mechanistic studies involved assessing interactions with Ezh2 and analyzing gene expression of key myogenic markers.

Main Results:

• Neat1 overexpression accelerated myoblast proliferation while suppressing differentiation and fusion.
• Neat1 knockdown in vivo led to increased muscle fiber cross-sectional area but impaired muscle regeneration.
• Neat1 was found to interact with Ezh2, recruiting it to target gene promoters, thereby regulating P21, Myog, Myh4, and Tnni2 expression.

Conclusions:

• Neat1 plays a significant, previously unrecognized role in regulating myogenesis.
• Neat1 promotes myoblast proliferation by downregulating P21 and inhibits differentiation by suppressing myogenic genes.
• The interaction of Neat1 with Ezh2 is a key mechanism through which it controls muscle development and regeneration.