Project description:We report a deletion on 11q13.3-q13.4 in one patients with severe mental retardation. We analyzed a patient with mental retardation and the related parents with a whole genome SNP Array.
Project description:This series represent the data set belonging to the publication by de Vries et al. Diagnostic genome profiling in mental retardation. American Journal of Human Genetics, vol 77: 606-616 (2005). In this study 100 patients with unexplained mental retardation were analyzed for DNA copy-number changes using a tiling-resolution genomewide microarray containing 32,447 BACs. Keywords: CGH
Project description:In the study we present a multicenter study in which three European diagnostic centres assessed the use of Affymetrix Mapping 500k SNP arrays for molecular karyotyping in patients with mental retardation. Each centre tested DNA from 40 patients with unexplained mental retardation together with their parents. In addition, 38 DNA samples containing known submicroscopic copy number variations (CNVs) were run for validation purposes.
Project description:In the study we present a multicenter study in which three European diagnostic centres assessed the use of Affymetrix Mapping 500k SNP arrays for molecular karyotyping in patients with mental retardation. Each centre tested DNA from 40 patients with unexplained mental retardation together with their parents. In addition, 38 DNA samples containing known submicroscopic copy number variations (CNVs) were run for validation purposes Keywords: genomic hybridisation
Project description:In this study 405 patients with unexplained mental retardation and 89 unaffected parents were analyzed for DNA copy-number changes using a tiling-resolution genomewide microarray containing 32,447 BACs. This series contains 367 slides from 315 individuals previously not reported, plus an additional 239 slides from 179 individuals previously reported in the series GSE3191. Keywords: array CGH
Project description:We report a recurrent microdeletion syndrome causing mental retardation, epilepsy and variable facial and digital dysmorphisms. We describe nine patients, including six probands; two with de novo deletions, two who inherited the deletion from an affected parent, and two with unknown inheritance. The proximal breakpoint of the largest deletion is contiguous with breakpoint 3 (BP3) of the Prader-Willi/Angelman region extending 3.95 Mb distally to BP5. A smaller 1.5 Mb deletion has proximal breakpoint within the larger deletion (BP4) and shares the same distal BP5. This recurrent 1.5 Mb deletion contains six genes, including a candidate gene for epilepsy (CHRNA7) that is likely responsible for the observed seizure phenotype. The BP4-BP5 region undergoes frequent inversion, suggesting a possible link between this inversion polymorphism and recurrent deletion. The frequency of these microdeletions in mental retardation cases is ~0.3% (6/2082 tested), a prevalence comparable to that of the Williams, Angelman, and Prader-Willi syndromes. Keywords: microdeletion, genomic disorder, mental retardation, epilepsy
