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Volume 50 Issue 12
Dec.  2023
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Article Contents

Protein O-GlcNAcylation homeostasis regulates facultative heterochromatin to fine-tune sog-Dpp signaling during Drosophila early embryogenesis

doi: 10.1016/j.jgg.2023.05.014
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This project has been supported by the National Natural Science Foundation of China (grants 91853108, 92153301, 31771589, and 32170821 to K.Y, 32101034 to F.C), Department of Science and Technology of Hunan Province (grants 2017RS3013, 2017XK2011, 2018DK2015, 2019SK1012, and 2021JJ10054 to K.Y, and the innovative team program 2019RS1010), and Central South University (2018CX032 to K.Y, 2019zzts046 to Y.Z, 2019zzts339 to X.L, 2021zzts497 to H.Y, and the innovation-driven team project 2020CX016). D.M.F.v.A. is supported by Wellcome Trust Investigator Award (110061), and a Novo Nordisk Foundation Laureate award (NNF21OC0065969).

  • Received Date: 2022-12-17
  • Accepted Date: 2023-05-18
  • Rev Recd Date: 2023-04-30
  • Publish Date: 2023-06-05
  • Protein O-GlcNAcylation is a monosaccharide post-translational modification maintained by two evolutionarily conserved enzymes, O-GlcNAc transferase (OGT) and O-GlcNAcase (OGA). Mutations in human OGT have recently been associated with neurodevelopmental disorders, although the mechanisms linking O-GlcNAc homeostasis to neurodevelopment are not understood. Here, we investigate the effects of perturbing protein O-GlcNAcylation using transgenic Drosophila lines that overexpress a highly active OGA. We reveal that temporal reduction of protein O-GlcNAcylation in early embryos leads to reduced brain size and olfactory learning in adult Drosophila. Downregulation of O-GlcNAcylation induced by the exogenous OGA activity promotes nuclear foci formation of Polycomb-group protein Polyhomeotic and the accumulation of excess K27 trimethylation of histone H3 (H3K27me3) at the mid-blastula transition. These changes interfere with the zygotic expression of several neurodevelopmental genes, particularly short gastrulation (sog), a component of an evolutionarily conserved sog-Decapentaplegic (Dpp) signaling system required for neuroectoderm specification. Our findings highlight the importance of early embryonic O-GlcNAcylation homeostasis for the fidelity of facultative heterochromatin redeployment and initial cell fate commitment of neuronal lineages, suggesting a possible mechanism underpinning OGT-associated intellectual disability.
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