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Prothrombin G20210A is a bifunctional gene polymorphism.

Angela M Carter¹, Mythily Sachchithananthan, Stan Stasinopoulos

¹Academic Unit of Molecular Vascular Medicine, University of Leeds, United Kingdom.

Thrombosis and Haemostasis

|June 1, 2002

Summary

The G20210A polymorphism impacts prothrombin mRNA processing and stability. This genetic variant leads to increased prothrombin protein and mRNA levels, affecting gene expression.

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Area of Science:

Molecular Biology
Genetics

Background:

The G20210A polymorphism is known to influence prothrombin mRNA processing.
Understanding the full impact of this polymorphism on gene expression is crucial.

Purpose of the Study:

To investigate the effect of the G20210A polymorphism on prothrombin mRNA stability.
To determine if this polymorphism alters prothrombin protein and mRNA levels.

Main Methods:

Transfection of NIH-3T3 cells with prothrombin cDNA variants (G vs. A).
mRNA stability assays using chimeric globin transcripts with prothrombin 3'-UTR variants.
Identification of RNA-binding protein interactions with the prothrombin 3'-UTR.

Main Results:

Cells expressing the 20210A variant produced three-fold more prothrombin protein and mRNA than those with the 20210G variant.

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The 20210G variant of the prothrombin 3'-UTR conferred greater instability to reporter transcripts compared to the 20210A variant.

Both prothrombin 3'-UTR variants bind cellular proteins, including HuR, an RNA-binding protein linked to mRNA stability.

Conclusions:

The G20210A polymorphism is bifunctional, affecting both mRNA processing and decay rates.
This polymorphism influences prothrombin gene expression through modulation of mRNA stability and processing efficiency.