Abstract
Gangliosides are sialic acid-containing glycosphingolipids that are most abundant in the nerve tissues. The quantity and expression pattern of gangliosides in brain change drastically throughout development and are mainly regulated through stage-specific expression of glycosyltransferase (ganglioside synthase) genes. We previously demonstrated that acetylation of histones H3 and H4 on the N-acetylgalactosaminyltransferase I (GalNAcT, GA2/GM2/GD2/GT2-synthase) gene promoter resulted in recruitment of trans-activation factors. In addition, we reported that epigenetic activation of the GalNAcT gene was also detected as accompanied by an apparent induction of neuronal differentiation in neural stem cells responding to an exogenous supplement of ganglioside GM1. Here, we present evidence supporting the concept that nuclear GM1 is associated with gene regulation in neuronal cells. We found that nuclear GM1 binds acetylated histones on the promoters of the GalNAcT and NeuroD1 genes in differentiated neurons. Our study demonstrates for the first time that GM1 interacts with chromatin via acetylated histones at the nuclear periphery of neuronal cells.
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Abbreviations
- AcH3:
-
Acetylated histone H3
- AcH4:
-
Acetylated histone H4
- ChIP:
-
Chromatin immunoprecipitation
- GalNAcT:
-
N-acetylgalactosaminyltransferase I (GA2/GM2/GD2/GT2-synthase)
- H3K27me3:
-
Histone H3 with trimethylation on lysine 27
- NPC:
-
Neuronal precursor cell
- NSC:
-
Neural stem cell
- ST-II:
-
Sialyltransferase II (GD3-synthase)
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Acknowledgments
We thank Dr. Wei-Hua Wu for helpful comments on this manuscript. This work was supported in part by a VA Merit Award (1 IO1BX001388 to RKY) and NIH Grants (RO1 NS26994 and RO1 NS11853 to RKY).
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Tsai, YT., Itokazu, Y. & Yu, R.K. GM1 Ganglioside is Involved in Epigenetic Activation Loci of Neuronal Cells. Neurochem Res 41, 107–115 (2016). https://doi.org/10.1007/s11064-015-1742-7
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DOI: https://doi.org/10.1007/s11064-015-1742-7