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- W4220807462 abstract "Abstract Since the ancestors of modern humans separated from those of Neandertals, around one hundred amino acid substitutions spread to essentially all modern humans. The biological significance of these changes is largely unknown. Here, we examine all six such amino acid substitutions in the three proteins known to have key roles in kinetochore function and chromosome segregation and to be highly expressed in the stem cells of the developing neocortex. When we introduce these modern human-specific substitutions in the mouse, three substitutions in two of these proteins, KIF18a and KNL1, cause a prolongation of metaphase and a reduction in chromosome segregation errors in apical progenitors of the developing neocortex. Conversely, the ancestral substitutions cause a reduction in metaphase length and an increase in chromosome segregation errors in human brain organoids. Our data also show that, in these aspects, Neandertals were more similar to chimpanzees than to modern humans. Thus, the fidelity of chromosome segregation during neocortex development improved in modern humans after their divergence from Neandertals." @default.
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- W4220807462 date "2022-03-30" @default.
- W4220807462 modified "2023-09-27" @default.
- W4220807462 title "Longer metaphase and fewer chromosome segregation errors in modern human than Neandertal brain development" @default.
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- W4220807462 doi "https://doi.org/10.1101/2022.03.30.486431" @default.
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