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Title: Loss-of-function variants in Kv 11.1 cardiac channels as a biomarker for SUDEP.
Austin Authors: Soh, Ming S;Bagnall, Richard D;Bennett, Mark F ;Bleakley, Lauren E;Mohamed Syazwan, Erlina S;Marie Phillips, A;Chiam, Mathew D F;McKenzie, Chaseley E;Hildebrand, Michael S ;Crompton, Douglas;Bahlo, Melanie;Semsarian, Christopher;Scheffer, Ingrid E ;Berkovic, Samuel F ;Reid, Christopher A
Affiliation: School of Biosciences, University of Melbourne, Melbourne, VIC, Australia
The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, VIC, Australia
Murdoch Children's Research Institute, The Royal Children's Hospital, Parkville, VIC, Australia
Department of Paediatrics, University of Melbourne, Royal Children's Hospital, Parkville, VIC, Australia
Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, The University of Sydney, Sydney, NSW, Australia
Faculty of Medicine and Health, The University of Sydney, Sydney, NSW, Australia
Epilepsy Research Centre
Neurology Department, Northern Health, Epping, VIC, Australia
Population Health and Immunity Division, The Walter and Eliza Hall Institute of Medical Research, Melbourne, VIC, Australia
Department of Medical Biology, University of Melbourne, Melbourne, VIC, Australia
Issue Date: 18-May-2021 2021-05-18
Publication information: Annals of Clinical and Translational Neurology 2021; online first: 18 May
Abstract: To compare the frequency and impact on the channel function of KCNH2 variants in SUDEP patients with epilepsy controls comprising patients older than 50 years, a group with low SUDEP risk, and establish loss-of-function KCNH2 variants as predictive biomarkers of SUDEP risk. We searched for KCNH2 variants with a minor allele frequency of <5%. Functional analysis in Xenopus laevis oocytes was performed for all KCNH2 variants identified. KCNH2 variants were found in 11.1% (10/90) of SUDEP individuals compared to 6.0% (20/332) of epilepsy controls (p = 0.11). Loss-of-function KCNH2 variants, defined as causing >20% reduction in maximal amplitude, were observed in 8.9% (8/90) SUDEP patients compared to 3.3% (11/332) epilepsy controls suggesting about threefold enrichment (nominal p = 0.04). KCNH2 variants that did not change channel function occurred at a similar frequency in SUDEP (2.2%; 2/90) and epilepsy control (2.7%; 9/332) cohorts (p > 0.99). Rare KCNH2 variants (<1% allele frequency) associated with greater loss of function and an ~11-fold enrichment in the SUDEP cohort (nominal p = 0.03). In silico tools were unable to predict the impact of a variant on function highlighting the need for electrophysiological analysis. These data show that loss-of-function KCNH2 variants are enriched in SUDEP patients when compared to an epilepsy population older than 50 years, suggesting that cardiac mechanisms contribute to SUDEP risk. We propose that genetic screening in combination with functional analysis can identify loss-of-function KCNH2 variants that could act as biomarkers of an individual's SUDEP risk.
DOI: 10.1002/acn3.51381
ORCID: 0000-0002-5689-2082
PubMed URL: 34002542
Type: Journal Article
Appears in Collections:Journal articles

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