Identification of non-recurrent submicroscopic genome imbalances: the advantage of genome-wide microarrays over targeted approaches.
until further notice
SourceEuropean Journal of Human Genetics, 16, 3, (2008), pp. 395-400
Article / Letter to editor
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European Journal of Human Genetics
SubjectDCN 2: Functional Neurogenomics; IGMD 3: Genomic disorders and inherited multi-system disorders; NCMLS 6: Genetics and epigenetic pathways of disease; ONCOL 1: Hereditary cancer and cancer-related syndromes; ONCOL 3: Translational research; UMCN 5.1: Genetic defects of metabolism
Genome-wide analysis of DNA copy-number changes using microarray-based technologies has enabled the detection of de novo cryptic chromosome imbalances in approximately 10% of individuals with mental retardation. So far, the majority of these submicroscopic microdeletions/duplications appear to be unique, hampering clinical interpretation and genetic counselling. We hypothesised that the genomic regions involved in these de novo submicroscopic aberrations would be candidates for recurrent copy-number changes in individuals with mental retardation. To test this hypothesis, we used multiplex ligation-dependent probe amplification (MLPA) to screen for copy number changes at eight genomic candidate regions in a European cohort of 710 individuals with idiopathic mental retardation. By doing so, we failed to detect additional submicroscopic rearrangements, indicating that the anomalies tested are non-recurrent in this cohort of patients. The break points flanking the candidate regions did not contain low copy repeats and/or sequence similarities, thus providing an explanation for its non-recurrent nature. On the basis of these data, we propose that the use of genome-wide microarrays is indicated when testing for copy-number changes in individuals with idiopathic mental retardation.
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