Enables several functions, including Notch binding activity; chromatin DNA binding activity; and transcription coactivator activity. Involved in several processes, including blood vessel endothelial cell differentiation; heart development; and negative regulation of cell differentiation. Acts upstream of or within several processes, including animal organ development; nervous system development; and tube morphogenesis. Located in several cellular components, including adherens junction; apical plasma membrane; and cell surface. Is expressed in several structures, including alimentary system; cardiovascular system; central nervous system; genitourinary system; and sensory organ. Human ortholog(s) of this gene implicated in Adams-Oliver syndrome; adult T-cell leukemia; and aortic valve disease 1. Orthologous to human NOTCH1 (notch receptor 1). [provided by Alliance of Genome Resources, Apr 2022]