M232R, V180I, and V210I show varying degrees of enrichment in cases over
controls, indicating a weak to moderate increase in risk. Best estimates of
lifetime risk in heterozygotes (Materials and Methods) range from
~0.08% for M232R to ~7.8% for V210I, and
correlate with the proportion of patients with a positive family history. Allele
frequencies for P102L, A117V, D178N and E200K are consistent with up to
100% penetrance, with confidence intervals including all reported
estimates of E200K penetrance based on survival analysis, which range from
~60% to ~90% (19, 23–26). Rates of family history of
neurodegenerative disease in Japanese cases are from (Table S10) and in
European populations are from Kovacs et al (21), with Wilson binomial 95% confidence intervals shown.
*Based on allele counts rounded for privacy (Materials and Methods).
†GSS, Gerstmann Straussler Scheinker disease associated with variants
P102L, A117V and G131V. ‡FFI: fatal familial insomnia associated with a
D178N cis 129M haplotype.