title: 1471 delTTCT a Common Mutation of Tunisian Patients with Lysinuric Protein Intolerance.
abstract: BACKGROUND
  Lysinuric protein intolerance is an inherited aminoaciduria caused by defective cationic amino acid transport. It is an autosomal recessive disease caused by mutations in the SLC7A 7 gene. The objective of this study was to identify the mutations of Tunisians patients in order to offer the genetic counseling and the prenatal diagnosis to families.
  
  
  METHODS
  Five affected Tunisian children (4 girls and 1 boy) belonging to four consanguineous families were considered. The diagnosis was made based on the plasma for amino acids quantification by Ion Exchange chromatography, the DNA for mutational analysis by DHPLC and sequencing, and the amniotic fluid for prenatal diagnosis.
  
  
  RESULTS
  For the 5 patients, clinical features were dominated by failure to thrive, bone marrow abnormalities, hepatosplenomegaly, and mental retardation. The diagnosis for all patients was confirmed by biochemical analysis with hyperammonemia, hyperexcretion of urinary dibasic amino acids, and a high amount of orotic acid in the urine. The 1471 delTTCT mutation was identified in exon 9 in the homozygous state for all Tunisian patients. Genetic counseling was performed for three out of four families, four heterozygous and two homozygous healthy siblings were identified. The result of prenatal diagnosis showed the presence of the 1471 de1TTCT mutation in the homozygous state for the third pregnancy and heterozygous state for the fourth.
  
  
  CONCLUSIONS
  The 1471 deITTCT mutation seems to be a common mutation of Tunisian population. The identification of this specific mutation provides a tool for confirmatory diagnosis, genetic counseling, and prenatal diagnosis.
authors.forename: Nadia
authors.initials: N
authors.lastname: Esseghir
authors.forename: Chiraz Souissi
authors.initials: CS
authors.lastname: Bouchlaka
authors.forename: Sondess Hadj
authors.initials: SH
authors.lastname: Fredj
authors.forename: Amel
authors.initials: A
authors.lastname: Ben Chehida
authors.forename: Hatem
authors.initials: H
authors.lastname: Azzouz
authors.forename: Monique
authors.initials: M
authors.lastname: Fontaine
authors.forename: Neji
authors.initials: N
authors.lastname: Tebib
authors.forename: Gilbert
authors.initials: G
authors.lastname: Briand
authors.forename: Taieb
authors.initials: T
authors.lastname: Messaoud
authors.forename: Amel Ben Ammar
authors.initials: AB
authors.lastname: Elgaaied
authors.forename: Naziha
authors.initials: N
authors.lastname: Kaabachi
mesh_terms: D000592:Amino Acid Metabolism, Inborn Errors / Q000235:genetics*; D027241:Amino Acid Transport System y+L; D002675:Child, Preschool; D005260:Female; D027301:Fusion Regulatory Protein 1, Light Chains / Q000235:genetics*; D017353:Gene Deletion; D006801:Humans; D007223:Infant; D008297:Male
chemical_list: D027241:Amino Acid Transport System y+L; D027301:Fusion Regulatory Protein 1, Light Chains; C421261:SLC7A7 protein, human