Abstract
We report 281 individuals carrying a pathogenic recurrent NF1 missense variant at p.Met1149, p.Arg1276, or p.Lys1423, representing three nontruncating NF1 hotspots in the University of Alabama at Birmingham (UAB) cohort, together identified in 1.8% of unrelated NF1 individuals. About 25% (95% confidence interval: 20.5–31.2%) of individuals heterozygous for a pathogenic NF1 p.Met1149, p.Arg1276, or p.Lys1423 missense variant had a Noonan-like phenotype, which is significantly more compared with the “classic” NF1-affected cohorts (all p <.0001). Furthermore, p.Arg1276 and p.Lys1423 pathogenic missense variants were associated with a high prevalence of cardiovascular abnormalities, including pulmonic stenosis (all p <.0001), while p.Arg1276 variants had a high prevalence of symptomatic spinal neurofibromas (p <.0001) compared with “classic” NF1-affected cohorts. However, p.Met1149-positive individuals had a mild phenotype, characterized mainly by pigmentary manifestations without externally visible plexiform neurofibromas, symptomatic spinal neurofibromas or symptomatic optic pathway gliomas. As up to 0.4% of unrelated individuals in the UAB cohort carries a p.Met1149 missense variant, this finding will contribute to more accurate stratification of a significant number of NF1 individuals. Although clinically relevant genotype–phenotype correlations are rare in NF1, each affecting only a small percentage of individuals, together they impact counseling and management of a significant number of the NF1 population.
Original language | English (US) |
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Pages (from-to) | 299-315 |
Number of pages | 17 |
Journal | Human mutation |
Volume | 41 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 2020 |
Keywords
- NF1
- genotype–phenotype correlation
- p.Arg1276
- p.Lys1423
- p.Met1149
ASJC Scopus subject areas
- Genetics
- Genetics(clinical)