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A new case of UDP-galactose transporter deficiency (SLC35A2-CDG): molecular basis, clinical phenotype, and therapeutic approach.

Abstract：

:Congenital disorders of glycosylation (CDG) are a group of hereditary metabolic diseases characterized by abnormal glycosylation of proteins and lipids. Often, multisystem disorders with central nervous system involvement and a large variety of clinical symptoms occur. The main characteristics are developmental delay, seizures, and ataxia. In this paper we report the clinical and biochemical characteristics of a 5-year-old girl with a defective galactosylation of N-glycans, resulting in developmental delay, muscular hypotonia, epileptic seizures, inverted nipples, and visual impairment. Next generation sequencing revealed a de novo mutation (c.797G > T, p.G266V) in the X-chromosomal gene SLC35A2 (solute carrier family 35, UDP-galactose transporter, member A2; MIM 300896). While this mutation was found heterozygous, random X-inactivation of the normal allele will lead to loss of normal SLC35A2 activity in respective cells. The functional relevance of the mutation was demonstrated by complementation of UGT-deficient MDCK-RCA(r) and CHO-Lec8 cells by normal UGT-expression construct but not by the mutant version. The effect of dietary galactose supplementation on glycosylation was investigated, showing a nearly complete normalization of transferrin glycosylation.

journal_name

J Inherit Metab Dis

journal_title

Journal of inherited metabolic disease

authors

Dörre K,Olczak M,Wada Y,Sosicka P,Grüneberg M,Reunert J,Kurlemann G,Fiedler B,Biskup S,Hörtnagel K,Rust S,Marquardt T

doi

10.1007/s10545-015-9828-6

subject

Has Abstract

pub_date

2015-09-01 00:00:00

pages

931-40

issue

5

eissn

0141-8955

issn

1573-2665

journal_volume

38

pub_type

杂志文章

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