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Cardiovascular Mettl3 Deficiency Causes Congenital Cardiac Defects and Postnatal Lethality in Mice
Qianqian Feng1, Lihua Qi1, Jiaqi Huang1
1Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Peking University; State Key Laboratory of Vascular Homeostasis and Remodeling, Beijing 100191, China.
International Journal of Biological Sciences
|April 30, 2025
Summary
N6-methyladenosine (m6A) RNA methylation is crucial for cardiovascular development. METTL3 deficiency causes congenital heart defects by downregulating key developmental genes, suggesting m6A as a therapeutic target for CHDs.
Area of Science:
- Epigenetics
- Molecular Biology
- Developmental Biology
Background:
- N6-methyladenosine (m6A) is the most prevalent RNA modification.
- Its role in cardiovascular development and congenital heart diseases (CHDs) remains unclear.
- Evidence suggests a link between m6A modification, CHD-related genes, and reduced METTL3 expression in CHD risk factors.
Purpose of the Study:
- To investigate the role of m6A RNA methylation in cardiovascular development.
- To determine if m6A RNA methylation modulates congenital heart diseases (CHDs).
- To explore the function of methyltransferase-like 3 (METTL3) in heart development.
Main Methods:
- Cardiovascular-specific Mettl3 knockout mouse model (Tagln-Cre; Mettl3).
- Analysis of congenital cardiac defects and postnatal lethality.
- m6A-specific methylated RNA-immunoprecipitation sequencing (MeRIP-seq).
- Quantitative analysis of gene expression (SOX4, SOX11, MEF2A).
Main Results:
- Cardiovascular Mettl3 deficiency led to postnatal lethality and severe cardiac defects.
- Identified SOX4, SOX11, and MEF2A as direct targets of METTL3-mediated m6A methylation.
- Mettl3 deficiency resulted in downregulated expression of SOX4, SOX11, and MEF2A.
- Established a link between insufficient m6A methylation and congenital cardiac defects.
Conclusions:
- Cardiovascular METTL3-catalyzed m6A RNA methylation is essential for normal heart development.
- METTL3 deficiency causes congenital heart defects by downregulating key transcription factors (Mef2a, Sox4, Sox11).
- METTL3-mediated m6A RNA methylation represents a potential therapeutic target for CHDs.
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