A gene regulatory network to control EMT programs in development and disease

Area of Science:

• Molecular Biology
• Developmental Biology
• Cancer Research

Background:

• Epithelial to Mesenchymal Transition (EMT) is crucial for cell plasticity in development and disease.
• EMT is orchestrated by transcription factors (EMT-TFs) like Snail, Zeb, Twist, and Prrx, often activated by TGF-β.
• Snail1 and Prrx1 expression correlates with distinct clinical outcomes and stem-like properties in cancer.

Purpose of the Study:

• To investigate the regulatory relationship between Snail1 and Prrx1 during EMT.
• To elucidate the molecular mechanism underlying the complementary expression patterns of Snail1 and Prrx1.
• To understand the role of this regulatory network in controlling EMT programs in development and disease.

Main Methods:

• Analysis of gene expression patterns during vertebrate development and in cancer.
• In vitro and in vivo validation of gene regulatory interactions.
• Investigation of feedback loops involving transcription factors and microRNAs (miR-15 family).

Main Results:

• Snail1 and Prrx1 exhibit complementary expression patterns.
• A feedback loop was identified where Snail1 represses Prrx1, and Prrx1 activates miR-15 to attenuate Snail1.
• This network establishes hierarchical temporal expression of Snail1 and Prrx1 during EMT.

Conclusions:

• The Snail1-Prrx1 feedback loop, involving microRNAs, governs EMT dynamics.
• This regulatory mechanism provides a switch for different EMT programs.
• Findings have significant implications for understanding development and cancer progression.