Document Detail


High-resolution molecular karyotyping in patients with developmental delay and/or multiple congenital anomalies in a clinical setting.
MedLine Citation:
PMID:  20486943     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Microarray-based comparative genomic hybridization (array-CGH) enables genomewide investigation of copy-number changes at high resolution and has recently been implemented as a clinical diagnostic tool. In this study we evaluate the usefulness of high-resolution arrays as a diagnostic tool in our laboratory and investigate the diagnostic yield in the first 160 patients who were clinically referred for investigation of developmental delay (DD)/multiple congenital anomalies (MCA). During this period both 38K BAC-arrays and 244K oligonucleotide-arrays were used. Copy-number variations (CNVs) not previously reported as normal variants were detected in 22.5% of cases. In 13.1% the aberrations were considered causal to the phenotype and in 9.4% the clinical significance was uncertain. There was no difference in diagnostic yield between patients with mild, moderate or severe DD. Although the effective resolution of the 244K oligonucleotide-arrays was higher than the 38K BAC-array, the diagnostic yield of both platforms was approximately equal and no causal aberrations <300 kb were detected in this patient cohort. We experienced that increasing the resolution of a whole genome screen in the diagnostic setting has its drawback of detecting an increased number of CNVs with uncertain contribution to a phenotype. Based on our experiences, array-CGH is recommended as the first-step analysis in the genetic evaluation of patients with DD and/or MCA.
Authors:
J Wincent; B-M Anderlid; M Lagerberg; M Nordenskjöld; J Schoumans
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Clinical genetics     Volume:  79     ISSN:  1399-0004     ISO Abbreviation:  Clin. Genet.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-07     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0253664     Medline TA:  Clin Genet     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  147-57     Citation Subset:  IM    
Copyright Information:
© 2010 John Wiley & Sons A/S.
Affiliation:
Department of Molecular Medicine and Surgery and Center for Molecular Medicine, CMM L8:02, Karolinska Institutet, Karolinska University Hospital, Solna, S-171 76 Stockholm, Sweden. Josephine.Wincent@ki.se
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