title: Molecular genetic assay of mucopolysaccharidosis IVA in South China.
abstract: Mucopolysaccharidosis IVA (MPS IVA) is an autosomal recessive lysosomal storage disorder caused by the deficiency of N-acetylgalactosamine-6-sulfate sulfatase (GALNS). Molecular mutational analysis was performed by PCR product sequencing for fourteen exons and exon-intron boundaries of GALNS gene in 21 patients from 19 unrelated families with severe MPS IVA in South China. We identified fifteen different mutations, including 10 reported mutations (p.P125L, p.G290S, p.M318R, p.G340D, p.L366P, p.R386C, p.A392V, c.1243-1G>C, p.L440RfsX54 and p.X523E) and five novel mutations (p.N177S, p.G290R, p.F306S, p.W403_T404delinsCS, p.W520X). All five novel mutations were inherited from parents of the patients and not found in 100 normal control alleles. Three mutations, p.M318R, p.L366P and p.R386C were common, accounting for 36.8% of mutant alleles investigated. One patient homozygous of p.A392V and the other two unrelated patients homozygous of p.L366P presented classical disease course. The results show that the GALNS gene has a different mutational spectrum in South China as compared to other regions. The p.A392V and p.L366P mutations were associated with severe phenotype of MPS IVA.
authors.affiliation: Department of Endocrinology and Metabolism, Guangzhou Women and Children's Medical Center, Guangzhou Medical College, Guangzhou, China.
authors.forename: Dengmin
authors.initials: D
authors.lastname: He
authors.forename: Yonglan
authors.initials: Y
authors.lastname: Huang
authors.forename: Zhiying
authors.initials: Z
authors.lastname: Ou
authors.forename: Huiying
authors.initials: H
authors.lastname: Sheng
authors.forename: Sheyong
authors.initials: S
authors.lastname: Li
authors.forename: Xiaoyuan
authors.initials: X
authors.lastname: Zhao
authors.forename: Ru
authors.initials: R
authors.lastname: Li
authors.forename: Jipeng
authors.initials: J
authors.lastname: Zheng
authors.forename: Li
authors.initials: L
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D001483:Base Sequence; D016022:Case-Control Studies; D002648:Child; D002681:China; D002811:Chondroitinsulfatases / Q000235:genetics*; D017124:Conserved Sequence; D005260:Female; D006720:Homozygote; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009085:Mucopolysaccharidosis IV / Q000209:etiology / Q000235:genetics*; D009154:Mutation; D055815:Young Adult
chemical_list: D002811:Chondroitinsulfatases; C102295:GALNS protein, human
keywords: Cr; GAG; GALNS; GALNS gene; MPS; Mucopolysaccharidosis type IVA; Mutation; N-acetylgalactosamine-6-sulfate sulfatase; SNP; creatinine; glycosaminoglycan; mucopolysaccharidosis; single nucleotide polymorphism