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Novel junctophilin-2 mutation A405S is associated with basal septal hypertrophy and diastolic dysfunction.

Publication ,  Journal Article
Quick, AP; Landstrom, AP; Wang, Q; Beavers, DL; Reynolds, JO; Barreto-Torres, G; Tran, V; Showell, J; Philippen, LE; Morris, SA; Skapura, D ...
Published in: JACC Basic Transl Sci
February 2017

BACKGROUND: Hypertrophic cardiomyopathy (HCM), defined as asymmetric left ventricular hypertrophy, is a leading cause of cardiac death in the young. Perturbations in calcium (Ca2+) handling proteins have been implicated in the pathogenesis of HCM. JPH2-encoded junctophilin 2 is a major component of the junctional membrane complex, the subcellular microdomain involved in excitation-contraction coupling. We hypothesized that a novel JPH2 mutation identified in patients with HCM is causally linked to HCM, and alters intracellular Ca2+ signaling in a pro-hypertrophic manner. OBJECTIVES: To determine using a transgenic mouse model whether a JPH2 mutation found in a HCM patient is responsible for disease development. METHODS: Genetic interrogation of a large cohort of HCM cases was conducted for all coding exons of JPH2. Pseudo-knock-in (PKI) mice containing a novel JPH2 variant were subjected to echocardiography, cardiac MRI, hemodynamic analysis, and histology. RESULTS: A novel JPH2 mutation, A405S, was identified in a genotype-negative proband with significant basal septal hypertrophy. Although initially underappreciated by traditional echocardiographic imaging, PKI mice with this JPH2 mutation (residue A399S in mice) were found to exhibit similar basal hypertrophy using a newly developed echo imaging plane, and this was confirmed using cardiac MRI. Histological analysis demonstrated cardiomyocyte hypertrophy and disarray consistent with HCM. CONCLUSIONS: Variant A405S is a novel HCM-associated mutation in JPH2 found in a proband negative for mutations in the canonical HCM-associated genes. Studies in the analogous mouse model demonstrated for the first time a causal link between a JPH2 defect and HCM. Moreover, novel imaging approaches identified subvalvular septal hypertrophy, specific findings also reported in the human JPH2 mutation carrier.

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Published In

JACC Basic Transl Sci

DOI

ISSN

2452-302X

Publication Date

February 2017

Volume

2

Issue

1

Start / End Page

56 / 67

Location

United States

Related Subject Headings

  • 3201 Cardiovascular medicine and haematology
  • 1103 Clinical Sciences
  • 1102 Cardiorespiratory Medicine and Haematology
 

Citation

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Quick, A. P., Landstrom, A. P., Wang, Q., Beavers, D. L., Reynolds, J. O., Barreto-Torres, G., … Wehrens, X. H. T. (2017). Novel junctophilin-2 mutation A405S is associated with basal septal hypertrophy and diastolic dysfunction. JACC Basic Transl Sci, 2(1), 56–67. https://doi.org/10.1016/j.jacbts.2016.11.004
Quick, Ann P., Andrew P. Landstrom, Qiongling Wang, David L. Beavers, Julia O. Reynolds, Giselle Barreto-Torres, Viet Tran, et al. “Novel junctophilin-2 mutation A405S is associated with basal septal hypertrophy and diastolic dysfunction.JACC Basic Transl Sci 2, no. 1 (February 2017): 56–67. https://doi.org/10.1016/j.jacbts.2016.11.004.
Quick AP, Landstrom AP, Wang Q, Beavers DL, Reynolds JO, Barreto-Torres G, et al. Novel junctophilin-2 mutation A405S is associated with basal septal hypertrophy and diastolic dysfunction. JACC Basic Transl Sci. 2017 Feb;2(1):56–67.
Quick, Ann P., et al. “Novel junctophilin-2 mutation A405S is associated with basal septal hypertrophy and diastolic dysfunction.JACC Basic Transl Sci, vol. 2, no. 1, Feb. 2017, pp. 56–67. Pubmed, doi:10.1016/j.jacbts.2016.11.004.
Quick AP, Landstrom AP, Wang Q, Beavers DL, Reynolds JO, Barreto-Torres G, Tran V, Showell J, Philippen LE, Morris SA, Skapura D, Bos JM, Pedersen SE, Pautler RG, Ackerman MJ, Wehrens XHT. Novel junctophilin-2 mutation A405S is associated with basal septal hypertrophy and diastolic dysfunction. JACC Basic Transl Sci. 2017 Feb;2(1):56–67.
Journal cover image

Published In

JACC Basic Transl Sci

DOI

ISSN

2452-302X

Publication Date

February 2017

Volume

2

Issue

1

Start / End Page

56 / 67

Location

United States

Related Subject Headings

  • 3201 Cardiovascular medicine and haematology
  • 1103 Clinical Sciences
  • 1102 Cardiorespiratory Medicine and Haematology