Why the study?
Does the MiRP2-R83H mutation cause familial periodic paralysis?
Observational (n=321)
Does the MiRP2-R83H mutation cause familial periodic paralysis?
The MiRP2-R83H mutation is present in healthy controls and does not cause weakness upon provocation, challenging its previously reported causal role in familial periodic paralysis.
Answers are grounded in this paper and cite their sources.
MiRP2-R83H should not be deemed causative for periodic paralysis; leaves open stricter control-based criteria for channelopathy variant pathogenicity.
An R83H point mutation in KCNE3-encoded MiRP2 has been reported to cause 2% of all cases of familial periodic paralysis. The authors found MiRP2-R83H in 3 of 321 control subjects and in 5 unaffected related individuals. Provocation of an unaffected carrier with glucose or KCl did not induce weakness. The authors propose that causality criteria for mutations require exclusion of mutations in n = ln(P)/ln(1 - p(1)) ethnically matched control chromosomes (P = acceptable error probability; p(1) = mutation prevalence in patient chromosomes).
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Jurkat‐Rott et al. (2004) conducted an observational in Familial periodic paralysis (n=321). MiRP2-R83H mutation vs. Absence of mutation was evaluated on Presence of MiRP2-R83H mutation and induction of weakness.
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