A functional splice variant of the human Golgi CMP-sialic acid transporter.

antigen (NeuAcα2-3Galβ1-4(Fucα1-3)GlcNAc-R) on polymorphonuclear cells. This disease was caused by the presence of inactive SLC35A1 alleles. It was also found that the SLC35A1 generates additional isoforms through alternative splicing. In this work, we demonstrate that one of the reported isoforms, the del177 with exon 6 skipping, is able to maintain sialylation in HepG2 cells submitted to wt knockdown and restore sialylation to normal levels in the Chinese Hamester Ovary (CHO) cell line Lec2 mutant deficient in CMP-Sia transport. The characteristics of the alternatively spliced protein are discussed as well as therapeutic implications of this finding in CDGs caused by mutations in nucleotide sugar transporters (NSTs).

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