The xylosyltransferase Iota gene polymorphism c.343G>T (p.A115S) is associated with decreased serum glycosaminoglycan levels.
OBJECTIVE
The xylosyltransferases I and II (XT-I, XT-II, EC 2.4.2.26) are the chain-initiating enzymes in the biosynthesis of glycosaminoglycans (GAGs). This is the first investigation of changes in the serum GAG amount and composition in association with polymorphisms in XYLT1 and XYLT2.


METHODS
Genotyping of three genetic variations in the genes XYLT1 and XYLT2 was performed in 223 healthy blood donor samples. Serum samples were analyzed for their GAG Delta-disaccharide content by reversed-phase high-performance liquid chromatography (RP-HPLC). Furthermore serum XT activity was determined by a radiochemical assay.


RESULTS
The single nucleotide polymorphism (SNP) c.343G>T in XYLT1 exon 1 correlated with a significantly decreased GAG content in the serum (p<0.01). For the other two investigated XYLT2 variations (c.166G>A in exon 2 and c.1253C>T in exon 6) no changes in the serum GAG amount were detected. No investigated SNPs were associated with changes to serum XT activities.


CONCLUSIONS
The XYLT1 SNP c.343G>T is associated with a decreased GAG amount in the serum of healthy blood donors.
Ambrosius
Michael
M
Institut für Laboratoriums- und Transfusionsmedizin, Herz- und Diabeteszentrum Nordrhein-Westfalen, Universitätsklinik der Ruhr-Universität Bochum, Georgstrabetae 11, 32545 Bad Oeynhausen, Germany.
Kleesiek
Knut
K
Götting
Christian
C
D000328:Adult; D002851:Chromatography, High Pressure Liquid; D005260:Female; D005838:Genotype; D006025:Glycosaminoglycans / Q000097:blood*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010430:Pentosyltransferases / Q000235:genetics* / Q000502:physiology*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics* / Q000502:physiology; D000097608:UDP Xylose-Protein Xylosyltransferase
D006025:Glycosaminoglycans; D010430:Pentosyltransferases; D000097608:UDP Xylose-Protein Xylosyltransferase