Sialic Acid Binding Ig Like Lectin 10 (SIGLEC10)

By searching an EST database for sequences resembling CD33 (SIGLEC3) and screening a spleen cDNA library, Munday et al. (2001) isolated a cDNA encoding SIGLEC10. Sequence analysis predicted that the 697-amino acid SIGLEC10 protein contains a signal peptide, an N-terminal V-set Ig-like domain and 4 C2-set Ig-like domains, 5 potential N-linked glycosylation sites, a transmembrane region, and a 126-residue cytoplasmic tail with 3 putative ITIMs. Northern blot analysis detected a major 3.0-kb SIGLEC10 transcript, with highest levels in spleen, lymph node, blood leukocytes, and appendix. Little or no expression was observed in pancreas, thyroid, and testis. Flow cytometric analysis demonstrated eosinophil-specific expression of SIGLEC10, but at a lower level than that of SIGLEC8.