ZFIN ID: ZDB-PUB-150531-3
Loss of Function Mutations in NNT Are Associated with Left Ventricular Noncompaction
Bainbridge, M.N., Davis, E.E., Choi, W.Y., Dickson, A., Martinez, H.R., Wang, M., Dinh, H., Muzny, D., Pignatelli, R., Katsanis, N., Boerwinkle, E., Gibbs, R., Jefferies, J.L.
Date: 2015
Source: Circulation. Cardiovascular genetics   8(4): 544-52 (Journal)
Registered Authors: Choi, Wen-Yee, Davis, Erica, Dickson, Amy, Katsanis, Nicholas
Keywords: genetics, human, genomics, left ventricular noncompaction, noncompaction cardiomyopathy
MeSH Terms:
  • Animals
  • Animals, Genetically Modified
  • Embryo, Nonmammalian/embryology
  • Embryo, Nonmammalian/metabolism
  • Exome/genetics
  • Family Health
  • Female
  • Frameshift Mutation*
  • Genetic Complementation Test
  • Genetic Predisposition to Disease/genetics*
  • Humans
  • Isolated Noncompaction of the Ventricular Myocardium/genetics*
  • Luminescent Proteins/genetics
  • Luminescent Proteins/metabolism
  • Male
  • Microscopy, Confocal
  • Mitochondrial Proteins/genetics
  • NADP Transhydrogenase, AB-Specific/genetics*
  • Pedigree
  • Sequence Analysis, DNA
  • Zebrafish/embryology
  • Zebrafish/genetics
PubMed: 26025024 Full text @ Circ Cardiovasc Genet
-Left ventricular noncompaction (LVNC) is an autosomal dominant, genetically heterogeneous cardiomyopathy with variable severity, which may co-occur with cardiac hypertrophy.
-Here, we generated whole exome sequence (WES) data from multiple members from five families with LVNC. In four out of five families, the candidate causative mutation segregates with disease in known LVNC genes MYH7 and TPM1. Subsequent sequencing of MYH7 in a larger LVNC cohort identified seven novel likely disease causing variants. In the fifth family, we identified a frameshift mutation in NNT, a nuclear encoded mitochondrial protein, not implicated previously in human cardiomyopathies. Resequencing of NNT in additional LVNC families identified a second likely pathogenic missense allele. Suppression of nnt in zebrafish caused early ventricular malformation and contractility defects, likely driven by altered cardiomyocyte proliferation. In vivo complementation studies showed that mutant human NNT failed to rescue nnt morpholino-induced heart dysfunction, indicating a probable haploinsufficiency mechanism.
-Together, our data expand the genetic spectrum of LVNC and demonstrate how the intersection of WES with in vivo functional studies can accelerate the identification of genes that drive human genetic disorders.