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• W1978379038 abstract "HES transcriptional repressors are important components of the Notch pathway that regulates neurogenesis from Drosophila to vertebrates. These proteins are normally induced by Notch activity and inhibit neural commitment by antagonizing the activity of proneural genes. We describe here four chick hes genes that are expressed during neurogenesis: three hes5-like genes (hes5-1, hes5-2 and hes5-3) and one hes6-like (hes6-2). We show that hes6-2 represses transcription of the hes5 genes, thus functioning as a negative regulator of Notch signaling. Conversely, hes6-2 may be repressed by hes5 activity. In cells committing to differentiation, we find that hes6-2 is up-regulated by proneural genes and contributes to the proneural program of neuronal commitment by preventing Notch activity in these cells. In neural progenitors, Notch signaling produces an initial burst of hes5 activity, which represses hes6-2. However, as hes5 transcription declines due to negative auto-regulation, hes6-2 may become active and inhibit the remaining hes5 activity to end Notch signaling. These cells can then enter a new cycle of fate decisions and will be kept as progenitors if a new pulse of Notch activity occurs. Maintenance of progenitors during vertebrate neurogenesis therefore requires that these cells go through successive cycles of Notch activity. We propose that the hes5/hes6 circuitry of negative cross-regulations is a conserved feature of the Notch pathway that underlies these cycles in neural progenitors." @default.
• W1978379038 created "2016-06-24" @default.
• W1978379038 creator A5066784159 @default.
• W1978379038 creator A5077255106 @default.
• W1978379038 date "2005-05-01" @default.
• W1978379038 modified "2023-09-23" @default.
• W1978379038 title "A novel hes5/hes6 circuitry of negative regulation controls Notch activity during neurogenesis" @default.
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• W1978379038 doi "https://doi.org/10.1016/j.ydbio.2005.03.017" @default.
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