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Learn MoreNeurofibromatosis type 1 (NF1) is a common neurodevelopmental disorder caused by a spectrum of distinct germline NF1 gene mutations, traditionally viewed as equivalent loss-of-function alleles. To specifically address the issue of mutational equivalency in a disease with considerable clinical heterogeneity, we engineered seven isogenic human induced pluripotent stem cell lines, each with a different NF1 patient NF1 mutation, to identify potential NF1 mutation-specific effects on human central nervous system cells and tissues. While all mutations increased proliferation and RAS activity in two-dimensional (2D) neural progenitor cells (NPCs) and astrocytes, we observed striking NF1 mutation-specific effects on 2D NPC dopamine levels and NPC proliferation, apoptosis, and neuronal differentiation in developing cerebral organoids. Together, these findings demonstrate NF1 mutational specificity at the cellular and tissue levels, suggesting that the germline NF1 gene mutation is one factor that underlies clinical variability. SOURCE: David GutmannNF Center Washington University in St Louis
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