{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,6]],"date-time":"2026-11-06T22:43:28Z","timestamp":1794005008895,"version":"4.8.0"},"reference-count":58,"publisher":"Oxford University Press (OUP)","issue":"2","license":[{"start":{"date-parts":[[2025,8,30]],"date-time":"2025-08-30T00:00:00Z","timestamp":1756512000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"name":"Mayo Clinic Windland Smith Rice Comprehensive Sudden Cardiac Death Program"},{"DOI":"10.13039\/100001330","name":"Dr. Scholl Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100001330","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100014535","name":"Mayo Clinic Center for Individualized Medicine High-Definition Therapeutics","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100014535","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001711","name":"Swiss National Science Foundation","doi-asserted-by":"publisher","award":["310030_197595"],"award-info":[{"award-number":["310030_197595"]}],"id":[{"id":"10.13039\/501100001711","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001711","name":"Swiss National Science Foundation","doi-asserted-by":"publisher","award":["323530_207033"],"award-info":[{"award-number":["323530_207033"]}],"id":[{"id":"10.13039\/501100001711","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100020401","name":"Bern Center of Precision Medicine Lighthouse Project","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100020401","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,1,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background and Aims<\/jats:title>\n                    <jats:p>Type 1 short QT syndrome (SQT1) is a genetic channelopathy caused by gain-of-function variants in KCNH2, resulting in shortened cardiac repolarization and QT intervals, which predispose patients to ventricular arrhythmias and sudden cardiac death. This study aimed to investigate the therapeutic efficacy of KCNH2-specific suppression-and-replacement (KCNH2-SupRep) gene therapy in a transgenic rabbit model of SQT1.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>KCNH2-SupRep was developed by combining a KCNH2-shRNA with its corresponding shRNA-immune KCNH2-cDNA into an AAV9 vector, delivered directly into the aortic root (1 \u00d7 1010\u2005vg\/kg). Therapeutic efficacy was evaluated in vivo by electrocardiogram, ex vivo by optical mapping, and at cellular levels by patch-clamp, calcium imaging, and qPCR in ventricular cardiomyocytes (VCMs).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>In vivo, KCNH2-SupRep normalized the heart rate-corrected QT interval (QTc) in SQT1 rabbits, without affecting repolarization heterogeneity. Ex vivo, KCNH2-SupRep corrected the action potential duration (APD90) and resolved the increased apicobasal APD90 heterogeneity observed in untreated (UT)-SQT1 hearts, supporting an antiarrhythmic effect, which was further validated by reduced re-entry formation in silico. At cellular levels, KCNH2-SupRep prolonged APD90 in VCMs from SupRep-SQT1 rabbits closer to wildtype levels compared with UT- and sham-SQT1. Additionally, KCNH2-SupRep restored the cellular surrogate of the electro-mechanical window and normalized IKr in nearly 50% of VCMs, in line with a 50%\u201360% suppression of the mutant KCNH2 transcript.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This proof-of-concept study is the first to demonstrate the efficacy of gene therapy for SQT1 in a medium-sized animal model. KCNH2-SupRep gene therapy successfully corrected the pathologic phenotype in vivo, ex vivo, and at cellular levels in transgenic SQT1 rabbits.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1093\/eurheartj\/ehaf660","type":"journal-article","created":{"date-parts":[[2025,8,15]],"date-time":"2025-08-15T11:53:20Z","timestamp":1755258800000},"page":"199-213","source":"Crossref","is-referenced-by-count":12,"title":["AAV9-mediated\n                    <i>KCNH2<\/i>\n                    suppression-replacement gene therapy in a transgenic rabbit model of type 1 short QT syndrome"],"prefix":"10.1093","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9298-3678","authenticated-orcid":false,"given":"Saranda","family":"Nimani","sequence":"first","affiliation":[{"name":"Translational Cardiology, Department of Cardiology and Department of Physiology, University Hospital Bern, University of Bern , B\u00fchlplatz 5, Bern 3012 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