Wnt Signaling Interactor WTIP (Wilms Tumor Interacting Protein) Underlies Novel Mechanism for Cardiac Hypertrophy

Hannah N. De Jong, Frederick E. Dewey, Pablo Cordero, Rachelle A. Victorio, Anna Kirillova, Yong Huang, Roshni Madhvani, Kinya Seo, Andreas A. Werdich, Feng Lan, Mark Orcholski, W. Robert Liu, Ayca Erbilgin, Matthew T. Wheeler, Rui Chen, Stephen Pan, Young M. Kim, Krishna Bommakanti, Cherisse A. Marcou, J. Martijn BosFrancois Haddad, Michael Ackerman, Ramachandran S. Vasan, Calum Macrae, Joseph C. Wu, Vinicio De Jesus Perez, Michael Snyder, Victoria N. Parikh, Euan A. Ashley

Research output: Contribution to journalArticlepeer-review

Abstract

Background: The study of hypertrophic cardiomyopathy (HCM) can yield insight into the mechanisms underlying the complex trait of cardiac hypertrophy. To date, most genetic variants associated with HCM have been found in sarcomeric genes. Here, we describe a novel HCM-associated variant in the noncanonical Wnt signaling interactor WTIP (Wilms tumor interacting protein) and provide evidence of a role for WTIP in complex disease. Methods: In a family affected by HCM, we used exome sequencing and identity-by-descent analysis to identify a novel variant in WTIP (p.Y233F). We knocked down WTIP in isolated neonatal rat ventricular myocytes with lentivirally delivered short hairpin ribonucleic acids and in Danio rerio via morpholino injection. We performed weighted gene coexpression network analysis for WTIP in human cardiac tissue, as well as association analysis for WTIP variation and left ventricular hypertrophy. Finally, we generated induced pluripotent stem cell-derived cardiomyocytes from patient tissue, characterized size and calcium cycling, and determined the effect of verapamil treatment on calcium dynamics. Results: WTIP knockdown caused hypertrophy in neonatal rat ventricular myocytes and increased cardiac hypertrophy, peak calcium, and resting calcium in D rerio. Network analysis of human cardiac tissue indicated WTIP as a central coordinator of prohypertrophic networks, while common variation at the WTIP locus was associated with human left ventricular hypertrophy. Patient-derived WTIP p.Y233F-induced pluripotent stem cell-derived cardiomyocytes recapitulated cellular hypertrophy and increased resting calcium, which was ameliorated by verapamil. Conclusions: We demonstrate that a novel genetic variant found in a family with HCM disrupts binding to a known Wnt signaling protein, misregulating cardiomyocyte calcium dynamics. Further, in orthogonal model systems, we show that expression of the gene WTIP is important in complex cardiac hypertrophy phenotypes. These findings, derived from the observation of a rare Mendelian disease variant, uncover a novel disease mechanism with implications across diverse forms of cardiac hypertrophy.

Original languageEnglish (US)
Pages (from-to)E003563
JournalCirculation. Genomic and precision medicine
Volume15
Issue number4
DOIs
StatePublished - Aug 1 2022
Externally publishedYes

Keywords

  • calcium
  • cardiomyopathy, hypertrophic
  • humans
  • induced pluripotent stem cells
  • myocytes, cardiac
  • zebra fish

ASJC Scopus subject areas

  • Genetics
  • Cardiology and Cardiovascular Medicine
  • Genetics(clinical)

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