Enables O-fucosylpeptide 3-beta-N-acetylglucosaminyltransferase activity. Involved in lymphocyte differentiation; negative regulation of Notch signaling pathway involved in somitogenesis; and somitogenesis. Acts upstream of or within several processes, including compartment pattern specification; positive regulation of Notch signaling pathway; and regulation of somitogenesis. Predicted to be located in Golgi membrane. Is expressed in several structures, including alimentary system; embryo ectoderm; genitourinary system; inner ear; and paraxial mesenchyme. Human ortholog(s) of this gene implicated in spondylocostal dysostosis. Orthologous to human LFNG (LFNG O-fucosylpeptide 3-beta-N-acetylglucosaminyltransferase). [provided by Alliance of Genome Resources, Apr 2022]