Characterization of the prothrombin gene expression during nerve differentiation

Area of Science:

• Neuroscience
• Molecular Biology
• Gene Regulation

Background:

• Investigating non-hepatic thrombin expression in the nervous system is of scientific interest.
• Prothrombin gene expression in neuroblastomas requires understanding its transcriptional regulation.

Purpose of the Study:

• To investigate the transcriptional regulation of the prothrombin gene in neuroblastoma cells.
• To identify the regulatory elements and factors involved in prothrombin gene expression in N2a cells.

Main Methods:

• Analysis of murine prothrombin gene transcription in proliferating and differentiating N2a cells.
• Site-directed mutagenesis and DNA binding assays to identify promoter elements and transcription factor binding sites.
• Electrophoretic mobility shift assays (EMSA) to study nuclear complex formation.

Main Results:

• Murine prothrombin gene is transcribed in proliferating N2a cells, with decreased transcripts during differentiation.
• Nuclear complex C-I binds to the promoter region (-248/-140), with a core binding site at -237/-231.
• A putative CRE site (-186/-179) interacts with CREM and is essential for promoter activity.
• Prothrombin gene transcription depends on cooperative binding of C-I and CREM to the promoter.

Conclusions:

• Prothrombin gene transcription in proliferating N2a cells is critically dependent on the cooperative interaction between C-I and a CRE site in the promoter.
• Lack of prothrombin expression during nerve differentiation is primarily due to the absence of C-I complex formation.