National Institutes of Health/National Cancer Institute (NIH/NCI)
United States
Citation
Journal: Proc Natl Acad Sci U S A / Year: 2023 Title: Destabilizing NF1 variants act in a dominant negative manner through neurofibromin dimerization. Authors: Lucy C Young / Ruby Goldstein de Salazar / Sae-Won Han / Zi Yi Stephanie Huang / Alan Merk / Matthew Drew / Joseph Darling / Vanessa Wall / Reinhard Grisshammer / Alice Cheng / Madeline R ...Authors: Lucy C Young / Ruby Goldstein de Salazar / Sae-Won Han / Zi Yi Stephanie Huang / Alan Merk / Matthew Drew / Joseph Darling / Vanessa Wall / Reinhard Grisshammer / Alice Cheng / Madeline R Allison / Matthew J Sale / Dwight V Nissley / Dominic Esposito / Jana Ognjenovic / Frank McCormick / Abstract: The majority of pathogenic mutations in the neurofibromatosis type I () gene reduce total neurofibromin protein expression through premature truncation or microdeletion, but it is less well ...The majority of pathogenic mutations in the neurofibromatosis type I () gene reduce total neurofibromin protein expression through premature truncation or microdeletion, but it is less well understood how loss-of-function missense variants drive NF1 disease. We have found that patient variants in codons 844 to 848, which correlate with a severe phenotype, cause protein instability and exert an additional dominant-negative action whereby wild-type neurofibromin also becomes destabilized through protein dimerization. We have used our neurofibromin cryogenic electron microscopy structure to predict and validate other patient variants that act through a similar mechanism. This provides a foundation for understanding genotype-phenotype correlations and has important implications for patient counseling, disease management, and therapeutics.
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