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mRNA Cap Methylation in Pluripotency and Differentiation.
Laura Grasso1, Olga Suska1, Lindsay Davidson2
1Centre for Gene Regulation and Expression, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK.
Cell Reports
|July 26, 2016
Summary
Regulated mRNA cap methylation, controlled by RAM, drives embryonic stem cell differentiation and reprogramming by altering gene expression. This dynamic mark is crucial for developmental transitions.
Area of Science:
- Molecular Biology
- Developmental Biology
- Epigenetics
Background:
- The mRNA cap is crucial for RNA processing and translation.
- Embryonic stem cell (ESC) differentiation involves significant changes in gene expression.
- ERK1/2 signaling is a known regulator of differentiation and pluripotency.
Purpose of the Study:
- To investigate the role of mRNA cap methylation in ESC differentiation.
- To elucidate the mechanism by which RAM regulates gene expression during differentiation.
- To determine if RAM influences cellular reprogramming.
Main Methods:
- Quantification of mRNA cap methylation levels in ESCs and during differentiation.
- Analysis of RAM (mRNA cap methyltransferase activating subunit) expression and activity.
- Investigation of ERK1/2-mediated phosphorylation and degradation of RAM.
- Assessment of fibroblast reprogramming efficiency with altered RAM expression.
Main Results:
- RAM expression and mRNA cap methylation are high in ESCs, correlating with pluripotency gene expression.
- RAM is suppressed during neural differentiation, leading to pluripotency gene repression and neural gene activation.
- ERK1/2 phosphorylates RAM, targeting it for degradation and facilitating loss of pluripotency.
- Increased RAM expression enhances fibroblast reprogramming efficiency.
Conclusions:
- Regulated mRNA cap methylation by RAM is a key mechanism controlling gene expression during ESC differentiation.
- RAM acts as a dynamic mark that instructs changes in gene expression for developmental transitions.
- The mRNA cap methylation pathway is a target for influencing cellular reprogramming and differentiation.
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