Key result
hERG nonsense mutations caused a decrease in mutant mRNA levels compared to wild-type alleles via nonsense-mediated mRNA decay, which was reversed by Upf1 knockdown or cycloheximide.
LQT2 nonsense mutations cause a decrease in mutant mRNA levels by nonsense-mediated mRNA decay rather than production of truncated proteins.
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NMD, not truncated proteins, drives LQT2 nonsense effects in models; leaves open mRNA-decay targeting for human arrhythmia therapies.
Gong et al. (2007) studied Long-QT syndrome type 2 (LQT2). hERG nonsense mutations vs. Wild-type allele was evaluated on hERG mRNA expression levels. hERG nonsense mutations caused a decrease in mutant mRNA levels compared to wild-type alleles via nonsense-mediated mRNA decay, which was reversed by Upf1 knockdown or cycloheximide.
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