Linked Life Data

17701443

Source:http://linkedlifedata.com/resource/pubmed/id/17701443

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2007-9-6
pubmed:abstractText
Cystinuria is an autosomal recessive disorder caused by defective transport of cystine and the dibasic amino acids ornithine, lysine and arginine across cell membranes. Poor solubility of cystine in urine leads to kidney stones and associated symptoms and complications. Mutations of genes SLC3A1 and SLC7A9 encoding for amino acid transport systems are responsible for different types of cystinuria. In this study we describe a new LC-MS/MS assay for these amino acids in urine. Moreover, we report a novel splice-acceptor site mutation in the SLC7A9 gene that we believe is the cause of the phenotype observed in four siblings from a first-cousin marriage. Into the wells of a 96-well microtitre plate, 10 microl of urine was mixed with 90 microl of a solution containing [(2)H4]cystine, [(2)H2]ornithine, [(13)C,(2)H4]arginine and [(2)H5]glutamine that was used as an internal standard for lysine. Chromatographic separation was achieved isocratically and detection was in the selected-reaction monitoring mode. The injection-to-injection time was 8 min. Calibration curves were linear up to 1000 micromol/L. Intra-day (n = 10) and inter-day (n = 6) variations (750 and 10 micromol/L) were less than 11.4%. Urine samples from healthy individuals (n = 135) were analysed and age-matched reference ranges were generated. The method was applied retrospectively and prospectively to analyse samples (n = 13) from nine cystinuria patients. The mutation reported here was not found in 100 controls with similar ethnicity to the studied family and is believed to have consequences for the transcribed mature RNA and protein structure and function.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1573-2665
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
30
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
611
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
LC-MS/MS determination of dibasic amino acids for the diagnosis of cystinuria. Application in a family affected by a novel splice-acceptor site mutation in the SLC7A9 gene.
pubmed:affiliation
National Laboratory for Newborn Screening, King Faisal Specialist Hospital and Research Centre, Taksussi Road, PO Box 3354, Riyadh, 11211, Saudi Arabia.
pubmed:publicationType
Journal Article, Case Reports