title: Allelic loss in a minimal region on chromosome 16q24 is associated with vitreous seeding of retinoblastoma.
abstract: In addition to RB1 gene mutations, retinoblastomas frequently show gains of 1q and 6p and losses of 16q. To identify suppressor genes on 16q, we analyzed 22 short tandem repeat loci in 58 patients with known RB1 mutations. A subset of tumors was also investigated by conventional and matrix comparative genomic hybridization. In 40 of 58 (69%) tumors, we found no loss of heterozygosity (LOH) at any 16q marker. LOH was detected in 18 of 58 (31%) tumors, including five with allelic imbalance at some markers. In one tumor LOH was only observed at 16q24. As the parental origin of allele loss was unbiased, an imprinted locus is unlikely to be involved. Analysis of gene expression by microarray hybridization and quantitative RT real-time PCR did not identify a candidate suppressor in 16q24. Cadherin 13 (CDH13), CBFA2T3, and WFDC1, which are candidate suppressors in other tumor entities with 16q24 loss, did not show loss of expression. In addition, mutation and methylation analysis showed no somatic alteration of CDH13. Results in all tumors with chromosome 16 alterations define a single minimal deleted region of 5.7 Mb in the telomeric part of 16q24 with the centromeric boundary defined by retention of heterozygosity for a single nucleotide variant in exon 10 of CDH13 (Mb 82.7). Interestingly, clinical presentation of tumors with and without 16q alterations was distinct. Specifically, almost all retinoblastomas with 16q24 loss showed diffuse intraocular seeding. This suggests that genetic alterations in the minimal deleted region are associated with impaired cell-to-cell adhesion.
authors.affiliation: Institut für Humangenetik, Institut für Zellbiologie, and Augenklinik, Universitätsklinikum Essen, Hufelandstrasse 55, D-45122 Essen, Germany.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Gratias
authors.forename: Harald
authors.initials: H
authors.lastname: Rieder
authors.forename: Reinhard
authors.initials: R
authors.lastname: Ullmann
authors.forename: Ludger
authors.initials: L
authors.lastname: Klein-Hitpass
authors.forename: Stephanie
authors.initials: S
authors.lastname: Schneider
authors.forename: Réka
authors.initials: R
authors.lastname: Bölöni
authors.forename: Martin
authors.initials: M
authors.lastname: Kappler
authors.forename: Dietmar R
authors.initials: DR
authors.lastname: Lohmann
mesh_terms: D015820:Cadherins / Q000235:genetics; D002872:Chromosome Deletion; D002885:Chromosomes, Human, Pair 16 / Q000235:genetics*; D019175:DNA Methylation; D004268:DNA-Binding Proteins; D006801:Humans; D019656:Loss of Heterozygosity; D018895:Microsatellite Repeats / Q000235:genetics; D020411:Oligonucleotide Array Sequence Analysis; D019572:Retinal Neoplasms / Q000235:genetics* / Q000473:pathology; D012175:Retinoblastoma / Q000235:genetics* / Q000473:pathology; D016160:Retinoblastoma Protein / Q000235:genetics; D020080:Tandem Repeat Sequences; D014764:Viral Proteins; D014822:Vitreous Body / Q000473:pathology*
chemical_list: D015820:Cadherins; D004268:DNA-Binding Proteins; C099972:H-cadherin; C069215:MuB protein, Enterobacteria phage Mu; D016160:Retinoblastoma Protein; D014764:Viral Proteins