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Development 138 (10): 1925-1934


RESEARCH ARTICLES

Regulation of mammalian Notch signaling and embryonic development by the protein O-glucosyltransferase Rumi

Rodrigo Fernandez-Valdivia1, Hideyuki Takeuchi2, Amin Samarghandi1, Mario Lopez1, Jessica Leonardi3, Robert S. Haltiwanger2, and Hamed Jafar-Nejad1,3,4,5,6,*

1 Brown Foundation Institute of Molecular Medicine (IMM), The University of Texas Health Science Center, Houston, TX 77030, USA
2 Department of Biochemistry and Cell Biology, Institute for Cell and Developmental Biology, Stony Brook University, Stony Brook, NY 11794, USA
3 Program in Developmental Biology, Baylor College of Medicine, Houston, TX 77030, USA
4 Department of Biochemistry and Molecular Biology, Medical School, The University of Texas Health Science Center, Houston, TX 77030, USA
5 Program in Genes and Development, The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77030, USA
6 Program in Biochemistry and Molecular Biology, The University of Texas Graduate School of Biomedical Sciences, Houston, TX 77030, USA

* Author for correspondence (hamed.jafar-nejad{at}uth.tmc.edu)

Accepted for publication 18 February 2011.

Abstract: Protein O-glucosylation is a conserved post-translational modification that occurs on epidermal growth factor-like (EGF) repeats harboring the C1-X-S-X-P-C2 consensus sequence. The Drosophila protein O-glucosyltransferase (Poglut) Rumi regulates Notch signaling, but the contribution of protein O-glucosylation to mammalian Notch signaling and embryonic development is not known. Here, we show that mouse Rumi encodes a Poglut, and that Rumi–/– mouse embryos die before embryonic day 9.5 with posterior axis truncation and severe defects in neural tube development, somitogenesis, cardiogenesis and vascular remodeling. Rumi knockdown in mouse cell lines results in cellular and molecular phenotypes of loss of Notch signaling without affecting Notch ligand binding. Biochemical, cell culture and cross-species transgenic experiments indicate that a decrease in Rumi levels results in reduced O-glucosylation of Notch EGF repeats, and that the enzymatic activity of Rumi is key to its regulatory role in the Notch pathway. Genetic interaction studies show that removing one copy of Rumi in a Jag1+/– (jagged 1) background results in severe bile duct morphogenesis defects. Altogether, our data indicate that addition of O-glucose to EGF repeats is essential for mouse embryonic development and Notch signaling, and that Jag1-induced signaling is sensitive to the gene dosage of the protein O-glucosyltransferase Rumi. Given that Rumi–/– embryos show more severe phenotypes compared to those displayed by other global regulators of canonical Notch signaling, Rumi is likely to have additional important targets during mammalian development.

Key Words: Notch signaling • O-glucosylation • Mouse • Jag1 • EGF repeat • Drosophila

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