• M Javier Herrero-Turrión, Mitsunori Fukuda, and Faustino Mollinedo.
• Centro de Investigación del Cáncer, Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas (C.S.I.C.)-Universidad de Salamanca, Campus Miguel de Unamuno, E-37007 Salamanca, Spain.
• Biochem. Biophys. Res. Commun. 2006 Feb 10; 340 (2): 386-94.

AbstractWe have identified a new human gene coined sytdep (synaptotagmin XIV-derived protein) in human neutrophils. Sytdep encodes a 188-amino acid sequence with a 21.435kDa deduced molecular mass, showing 75% identity to human synaptotagmin (syt) XIV. Human neutrophils express sytdep, but not syt XIV. Sytdep was upregulated during HL-60 neutrophil differentiation. Sytdep gene is located in human chromosome 4 and contains a unique exon, whereas syt XIV gene, located in chromosome 1, comprises 10 exons with 9 introns. Mouse genome did not contain sytdep. The N-terminal region of sytdep shows no homology with any known protein and, unlike synaptotagmin XIV isoforms, sytdep shows a unique C-terminal C2B domain. Polyclonal antibodies against the C2B domain of syt XIV recognized sytdep as a 27-kDa protein in human neutrophils. Genomic analyses suggest that human sytdep could derive from a retrotranslocation of a syt XIV transcript into chromosome 4.

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