Modeling long QT syndrome type 2 on-a-chip via indepth assessment of isogenic gene-edited 3D cardiac tissues

Jaimeson Veldhuizen, Helen F. Mann, Nina Karamanova, Wade D. Van Horn, Raymond Q. Migrino, David Brafman, Mehdi Nikkhah

Research output: Contribution to journalArticlepeer-review

Abstract

Long QT syndrome (LQTS) is a cardiovascular disease characterized by QT interval prolongation that can lead to sudden cardiac death. Many mutations with heterogeneous mechanisms have been identified in KCNH2, the gene that encodes for hERG (Kv11.1), which lead to onset of LQTS type 2 (LQTS2). In this work, we developed a LQTS2-diseased tissue-on-a-chip model, using 3D coculture of isogenic stem cell-derived cardiomyocytes (CMs) and cardiac fibroblasts (CFs) within an organotypic microfluidic chip technology. Primarily, we created a hiPSC line with R531W mutation in KCNH2 using CRISPR-Cas9 gene-editing technique and characterized the resultant differentiated CMs and CFs. A deficiency in hERG trafficking was identified in KCNH2-edited hiPSC-CMs, revealing a possible mechanism of R531W mutation in LQTS2 pathophysiology. Following creation of a 3D LQTS2 tissue-on-a-chip, the tissues were extensively characterized, through analysis of calcium handling and response to β-agonist. Furthermore, attempted phenotypic rescue via pharmacological intervention of LQTS2 on a chip was investigated.

Original languageEnglish (US)
Article numberabq6720
JournalScience Advances
Volume8
Issue number50
DOIs
StatePublished - 2022

ASJC Scopus subject areas

  • General

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