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Published on: July 21, 2021
Bmp2 and Bmp4 genetically interact to support multiple aspects of mouse development including functional heart
Takashi Uchimura1, Yoshihiro Komatsu, Momo Tanaka
1Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA.
Genesis (New York, N.Y. : 2000)
|April 25, 2009
Summary
Lowering the dosage of bone morphogenetic proteins (BMPs) 2 and 4 in mice leads to severe heart defects and reduced survival rates. This highlights the critical role of BMP dosage in embryonic development and postnatal cardiac function.
Area of Science:
- Developmental Biology
- Genetics
- Cardiovascular Biology
Background:
- Bone morphogenetic proteins (BMPs) are crucial signaling molecules regulating embryonic development.
- Precise dosage of BMPs is essential for normal mammalian development, with homozygous mutations often causing embryonic lethality.
Purpose of the Study:
- To investigate the impact of reduced dosage of BMP2 and BMP4 ligands on embryonic development and postnatal survival.
- To explore the specific roles of BMP2 and BMP4 in heart formation and function.
Main Methods:
- Generation of compound heterozygous mice for Bmp2 and Bmp4.
- Genotyping and phenotypic analysis of embryos and adult mice.
- Postnatal survival and body weight assessment.
- Detailed examination of cardiac abnormalities, including valve development.
Main Results:
- Compound heterozygous Bmp2/Bmp4 mice exhibited significantly reduced survival rates, with many dying shortly after birth due to ventricular septal defects (VSD).
- Embryos displayed developmental abnormalities including eye and body wall closure defects.
- Surviving adult mice showed progressive cardiac abnormalities, such as branched atrioventricular valve leaflets, and reduced body weight.
Conclusions:
- The dosage of BMP2 and BMP4 is critical for normal heart development during embryogenesis and for maintaining cardiac function postnatally.
- Combined haploinsufficiency of Bmp2 and Bmp4 leads to severe cardiovascular defects, underscoring the importance of balanced BMP signaling.
