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Tropomyosin 1: multiple roles in the developing heart and in the formation of congenital heart defects

England, Jennifer; Granados-Riveron, Javier T.; Polo-Parada, Luis; Kuriakose, Diji; Moore, Christopher; Brook, J. David; Rutland, Catrin S.; Setchfield, Kerry; Gell, Christopher; Ghosh, Tushar K.; Bu'Lock, Frances A.; Thornborough, Christopher; Ehler, Elisabeth; Loughna, Siobhan

Authors

Jennifer England

Javier T. Granados-Riveron

Luis Polo-Parada

Diji Kuriakose

Christopher Moore christopher.moore@nottingham.ac.uk

DAVID BROOK david.brook@nottingham.ac.uk
Professor of Human Genetics

Catrin S. Rutland

Kerry Setchfield

Christopher Gell

Tushar K. Ghosh

Frances A. Bu'Lock

Christopher Thornborough

Elisabeth Ehler



Abstract

Tropomyosin 1 (TPM1) is an essential sarcomeric component, stabilising the thin filament and facilitating actin's interaction with myosin. A number of sarcomeric proteins, such as alpha myosin heavy chain, play crucial roles in cardiac development. Mutations in these genes have been linked to congenital heart defects (CHDs), occurring in approximately 1 in 145 live births. To date, TPM1 has not been associated with isolated CHDs. Analysis of 380 CHD cases revealed three novel mutations in the TPM1 gene; IVS1 + 2T > C, I130V, S229F and a polyadenylation signal site variant GATAAA/AATAAA. Analysis of IVS1 + 2T > C revealed aberrant pre-mRNA splicing. In addition, abnormal structural properties were found in hearts transfected with TPM1 carrying I130V and S229F mutations. Phenotypic analysis of TPM1 morpholino-treated embryos revealed roles for TPM1 in cardiac looping, atrial septation and ventricular trabeculae formation and increased apoptosis was seen within the heart. In addition, sarcomere assembly was affected and altered action potentials were exhibited. This study demonstrated that sarcomeric TPM1 plays vital roles in cardiogenesis and is a suitable candidate gene for screening individuals with isolated CHDs.

Citation

England, J., Granados-Riveron, J. T., Polo-Parada, L., Kuriakose, D., Moore, C., Brook, J. D., …Loughna, S. (2017). Tropomyosin 1: multiple roles in the developing heart and in the formation of congenital heart defects. Journal of Molecular and Cellular Cardiology, 106, https://doi.org/10.1016/j.yjmcc.2017.03.006

Journal Article Type Article
Acceptance Date Mar 24, 2017
Online Publication Date Mar 27, 2017
Publication Date May 31, 2017
Deposit Date May 10, 2017
Publicly Available Date May 10, 2017
Journal Journal of Molecular and Cellular Cardiology
Print ISSN 0022-2828
Electronic ISSN 1095-8584
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 106
DOI https://doi.org/10.1016/j.yjmcc.2017.03.006
Keywords Cardiac development; Congenital heart defects; Structural protein; Tropomyosin 1
Public URL http://eprints.nottingham.ac.uk/id/eprint/42722
Publisher URL http://www.sciencedirect.com/science/article/pii/S0022282817300615
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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