title: Accurate detection of uniparental disomy and microdeletions by SNP array analysis in myelodysplastic syndromes with normal cytogenetics.
abstract: Progress in the management of patients with myelodysplastic syndromes (MDS) has been hampered by the inability to detect cytogenetic abnormalities in 40-60% of cases. We prospectively analyzed matched pairs of bone marrow and buccal cell (normal) DNA samples from 51 MDS patients by single nucleotide polymorphism (SNP) arrays, and identified somatically acquired clonal genomic abnormalities in 21 patients (41%). Among the 33 patients with normal bone marrow cell karyotypes, 5 (15%) had clonal, somatically acquired aberrations by SNP array analysis, including 4 with segmental uniparental disomies (UPD) and 1 with three separate microdeletions. Each abnormality was detected more readily in CD34+ cells than in unselected bone marrow cells. Paired analysis of bone marrow and buccal cell DNA from each patient was necessary to distinguish true clonal genomic abnormalities from inherited copy number variations and regions with apparent loss of heterozygosity. UPDs affecting chromosome 7q were identified in two patients who had a rapidly deteriorating clinical course despite a low-risk International Prognostic Scoring System score. Further studies of larger numbers of patients will be needed to determine whether 7q UPD detected by SNP array analysis will identify higher risk MDS patients at diagnosis, analogous to those with 7q cytogenetic abnormalities.
authors.affiliation: Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.
authors.forename: S
authors.initials: S
authors.lastname: Heinrichs
authors.forename: R V
authors.initials: RV
authors.lastname: Kulkarni
authors.forename: C E
authors.initials: CE
authors.lastname: Bueso-Ramos
authors.forename: R L
authors.initials: RL
authors.lastname: Levine
authors.forename: M L
authors.initials: ML
authors.lastname: Loh
authors.forename: C
authors.initials: C
authors.lastname: Li
authors.forename: D
authors.initials: D
authors.lastname: Neuberg
authors.forename: S M
authors.initials: SM
authors.lastname: Kornblau
authors.forename: J-P
authors.initials: JP
authors.lastname: Issa
authors.forename: D G
authors.initials: DG
authors.lastname: Gilliland
authors.forename: G
authors.initials: G
authors.lastname: Garcia-Manero
authors.forename: H M
authors.initials: HM
authors.lastname: Kantarjian
authors.forename: E H
authors.initials: EH
authors.lastname: Estey
authors.forename: A T
authors.initials: AT
authors.lastname: Look
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002872:Chromosome Deletion; D005260:Female; D006801:Humans; D007621:Karyotyping; D019656:Loss of Heterozygosity; D008297:Male; D008875:Middle Aged; D009190:Myelodysplastic Syndromes / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D020641:Polymorphism, Single Nucleotide; D024182:Uniparental Disomy