title: Evidence for association of SLC7A9 gene haplotypes with cystinuria manifestation in SLC7A9 mutation carriers.
abstract: Cystinuria is a complex genetic disorder. In the present study, we report on the strict linkage disequilibrium of SLC7A9 mutations with the wild type SLC7A9 haplotype of 15 single nucleotide polymorphisms (SNPs) and their effect on cystinuria manifestation and classification. Specifically, screening for mutations and polymorphisms was performed in the family members of ten cystinuric patients with SLC7A9 gene mutations. The molecular genetic and clinical data of cystinuric patients and their relatives were combined to construct the SLC7A9 SNP haplotypes and evaluate the manifestation of the disorder in carriers for a SLC7A9 gene mutation. It was found that all carriers of a SLC7A9 mutation manifested cystinuria if their normal allele had non-wild type nucleotides in two or more of the identified polymorphic sites. Subsequently, the polymorphic background of the SLC7A9 gene probably affects the expression of the disorder in SLC7A9 mutation carriers and points to a revised genetic classification of cystinuric patients.
authors.affiliation: Laboratory of Molecular Urology and Reproductive Genetics, Ioannina University School of Medicine, Ioannina, Greece.
authors.forename: Anthoula
authors.initials: A
authors.lastname: Chatzikyriakidou
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Sofikitis
authors.forename: Vasiliki
authors.initials: V
authors.lastname: Kalfakakou
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Siamopoulos
authors.forename: Ioannis
authors.initials: I
authors.lastname: Georgiou
mesh_terms: D026923:Amino Acid Transport Systems, Basic / Q000235:genetics*; D003555:Cystinuria / Q000145:classification / Q000453:epidemiology / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006239:Haplotypes; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D015810:Linkage Disequilibrium; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors
chemical_list: D026923:Amino Acid Transport Systems, Basic; C499489:SLC7A9 protein, human