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Glycoconj J. 2016 Dec;33(6):897-906. Epub 2016 Jul 7.

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

Author information

1
Laboratorio de Glicobiología Humana y Diagnóstico Molecular, Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001,Col. Chamilpa, 62209 Cuernavaca, MOR, Cuernavaca, México.
2
INSERM U1197, Paul Brousse Hospital, University of Paris Sud XI, 94800, Villejuif, France.
3
Laboratorio de Glicobiología Humana y Diagnóstico Molecular, Centro de Investigación en Dinámica Celular, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001,Col. Chamilpa, 62209 Cuernavaca, MOR, Cuernavaca, México. duncker@uaem.mx.

Abstract

The human Golgi Cytidine-5'-monophospho-N-acetylneuraminic acid (CMP-Sia) transporter SLC35A1, a member of the nucleotide sugar transporter family, translocates CMP-Sia from the cytosol into the Golgi lumen where sialyltransferases use it as donor substrate for the synthesis of sialoglycoconjugates. In 2005, we reported a novel Congenital Disorder of Glycosylation (CDG) termed CDG-IIf or SLC35A1-CDG, characterized by macrothrombocytopenia, neutropenia and complete lack of the sialyl-Lex 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).

KEYWORDS:

CDG; Lec 2; Morpholinos; SLC35A1; Sialic acid

PMID:
27387429
DOI:
10.1007/s10719-016-9697-8
[Indexed for MEDLINE]

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