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Heart defects in connexin43-deficient mice
J Ya1, E B Erdtsieck-Ernste, P A de Boer
1Department of Anatomy and Embryology, Academic Medical Center, University of Amsterdam, The Netherlands.
Circulation Research
|March 5, 1998
Summary
Connexin43 (CX43) disruption retards embryonic heart looping, causing malformations at the right ventricle and outflow tract junction. This leads to abnormal development, including intertrabecular pouches, impacting cardiac structure.
Area of Science:
- Developmental Biology
- Cardiovascular Research
- Genetics
Background:
- Connexin43 (CX43) is crucial for cardiac development, but its role in specific malformations is not fully understood.
- CX43 expression is widespread in the heart, yet cardiac malformations in CX43-disrupted mice are localized.
Purpose of the Study:
- To investigate the impact of connexin43 (CX43) disruption on cardiac morphogenesis.
- To identify the specific cardiac structures affected by CX43 deficiency during embryonic development.
Main Methods:
- Analysis of CX43-deficient mouse embryos from embryonic day 10 to birth.
- Utilized immunohistochemistry, hybridohistochemistry, and 3D reconstruction of serial heart sections.
Main Results:
- CX43 deficiency markedly retards the D-configuration of the embryonic heart's ascending loop.
- Abnormalities include a persistent craniomedial position of the right ventricle and an acute angle with the outflow tract.
- Delayed looping leads to a "crisscross" configuration and excessive development of intertrabecular pouches at the right ventricle-outflow tract junction.
Conclusions:
- Retarded D-loop formation in CX43-deficient hearts predisposes the right ventricle-outflow tract junction to malformations.
- These malformations include abnormal septation and the development of intertrabecular pouches, potentially affecting tricuspid valve development.