title: Maternal uniparental heterodisomy of chromosome 17 in a patient with nephropathic cystinosis.
abstract: We report maternal uniparental disomy of chromosome 17 (mat UPD17) in a 2.5-year-old girl presenting infantile cystinosis. This patient was homozygous for the 57 kb deletion encompassing the CTNS gene, frequently found in patients from the European origin. The proband's mother was heterozygous for the deletion and the father did not carry the deletion. We carried out haplotype analysis with polymorphic markers spanning the whole chromosome 17. Informative markers showed the presence of two maternal alleles but no paternal allele for regions spanning the 17q arm and the proximal half of 17p, and only one maternal allele on the distal 17p arm. As deletion of half of 17p is probably not viable, these results suggest mat UPD17 with heterodisomy of 17q and proximal 17p and isodisomy of distal 17p. This is the first demonstration of mat UPD17, in particular of isodisomy 17p, in cystinosis.
authors.affiliation: AP-HP, Hôpital Necker-Enfants Malades, Département de génétique, Paris, France.
authors.forename: Anne-Sophie
authors.initials: AS
authors.lastname: Lebre
authors.forename: Vincent
authors.initials: V
authors.lastname: Morinière
authors.forename: Olivier
authors.initials: O
authors.lastname: Dunand
authors.forename: Albert
authors.initials: A
authors.lastname: Bensman
authors.forename: Nicole
authors.initials: N
authors.lastname: Morichon-Delvallez
authors.forename: Corinne
authors.initials: C
authors.lastname: Antignac
mesh_terms: D026921:Amino Acid Transport Systems, Neutral / Q000235:genetics; D002675:Child, Preschool; D002886:Chromosomes, Human, Pair 17; D003554:Cystinosis / Q000209:etiology / Q000235:genetics*; D005260:Female; D006801:Humans; D007674:Kidney Diseases / Q000150:complications / Q000235:genetics*; D010375:Pedigree; D024182:Uniparental Disomy
chemical_list: D026921:Amino Acid Transport Systems, Neutral; C111445:CTNS protein, human