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Published on: September 23, 2014
Zinc Finger Protein Znf296 Is a Cardiac-Specific Splicing Regulator Required for Cardiomyocyte Formation
Xianpeng Li1, Shuaiqi Yang2, Lu Wang2
1College of Marine Life Sciences, Institute of Evolution and Marine Biodiversity and Key Laboratory of Evolution and Marine Biodiversity (Ministry of Education), Ocean University of China, Qingdao, China; Laboratory for Marine Biology and Biotechnology, Qingdao Marine Science and Technology Center, Qingdao, China; Institute of Brain Science and Brain-Inspired Research, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.
Insights
The zinc finger protein Znf296 is crucial for heart development and function. Loss of Znf296 in zebrafish causes heart defects by disrupting cardiomyocyte structure and gene splicing, a role conserved in human heart cells.
Area of Science:
- Cardiovascular Biology
- Molecular Genetics
- Developmental Biology
Background:
- Heart failure is a complex cardiovascular disease with unclear single-gene causes.
- Cardiac gene regulation at transcriptional and post-transcriptional levels is vital for heart function.
- Dysfunctional cardiac regulatory genes contribute to various heart diseases.
Purpose of the Study:
- To investigate the role of the zinc finger protein Znf296 in heart development and cardiac function.
- To elucidate the molecular mechanisms by which Znf296 influences cardiomyocyte structure and contractility.
- To determine if Znf296's function in heart development is conserved across species.
Main Methods:
- Utilized zebrafish (Danio rerio) as a model organism to study heart development.
- Generated znf296-deficient zebrafish embryos to observe cardiac phenotypes.
- Analyzed cardiomyocyte structure, cytoskeleton, and sarcomere organization.
- Investigated the impact of Znf296 deficiency on alternative splicing of key cardiac genes.
- Examined the interaction between Znf296 and myelin transcription factor 1-like (Myt1la).
- Assessed ZNF296's role in human cardiomyocytes.
Main Results:
- Znf296 deficiency in zebrafish led to significant heart defects, including reduced ventricular and atrial capacities.
- Cardiomyocytes in deficient embryos showed reduced numbers, disorganized cytoskeleton, and absent sarcomeres.
- Loss of Znf296 altered the alternative splicing of essential genes involved in heart development and disease (e.g., mef2ca, sparc, tpm2).
- Znf296 physically and functionally interacted with Myt1la to regulate cardiac splicing and development.
- ZNF296 was found to regulate alternative splicing in human cardiomyocytes, maintaining structural integrity.
Conclusions:
- Znf296 is essential for proper heart development and cardiac contractile function.
- The protein regulates cardiomyocyte differentiation and structural integrity through control of alternative splicing.
- Znf296's role in maintaining cardiovascular health is conserved between zebrafish and humans.
- Znf296 represents a potential target for understanding and treating heart diseases related to splicing defects.
Abstract:
Heart formation and function are tightly regulated at transcriptional and post-transcriptional levels. The dysfunction of cardiac cell-specific regulatory genes leads to various heart diseases. Heart failure is one of the most severe and complex cardiovascular diseases, which could be fatal if not treated promptly. However, the exact causes of heart failure are still unclear, especially at the level of single-gene causation. Here, an essential role was uncovered for the zinc finger protein Znf296 in heart development and cardiac contractile function. Specifically, znf296-deficient zebrafish embryos displayed heart defects characterized by decreased systolic and diastolic capacities of the ventricle and atrium. This was associated with reduced numbers and disrupted structural integrity of cardiomyocytes, including disorganized cytoskeleton and absence of sarcomeres. Mechanistically, the loss of Znf296 altered the alternative splicing of a subset of genes important for heart development and disease, such as mef2ca, sparc, tpm2, camk2g1, tnnt3b, and pdlim5b. Furthermore, Znf296 biochemically and functionally interacted with myelin transcription factor 1-like, a (Myt1la) in regulating cardiac-specific splicing and heart development. Importantly, ZNF296 also regulated alternative splicing in human cardiomyocytes to maintain structural integrity. These results suggest that Znf296 plays a conserved role for the differentiation of cardiomyocytes and the proper function of the cardiovascular system.
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