Array Comparative Genomic Hybridization as a Diagnostic Tool for Syndromic Heart Defects

Jeroen Breckpot, Bernard Thienpont, Hilde Peeters, Thomy de Ravel, Amihood Singer, Maissa Rayyan, Karel Allegaert, Christine Vanhole, Benedicte Eyskens, Joris Robert Vermeesch, Marc Gewillig, Koenraad Devriendt*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

82 Citations (Scopus)

Abstract

Objectives: To investigate different aspects of the introduction of array comparative genomic hybridization (aCGH) in clinical practice. Study design: A total 150 patients with a syndromic congenital heart defect (CHD) of unknown cause were analyzed with aCGH at 1-Mb resolution. Twenty-nine of these patients, with normal results on 1Mb aCGH, underwent re-analysis with 244-K oligo-microarray. With a logistic regression model, we assessed the predictive value of patient characteristics for causal imbalance detection. On the basis of our earlier experience and the literature, we constructed an algorithm to evaluate the causality of copy number variants. Results: With 1-Mb aCGH, we detected 43 structural variants not listed as clinically neutral polymorphisms, 26 of which were considered to be causal. A systematic comparison of the clinical features of these 26 patients to the remaining 124 patients revealed dysmorphism as the only feature with a significant predictive value for reaching a diagnosis with 1-Mb aCGH. With higher resolution analysis in 29 patients, 75 variants not listed as clinically neutral polymorphisms were detected, 2 of which were considered to be causal. Conclusions: Molecular karyotyping yields an etiological diagnosis in at least 18% of patients with a syndromic CHD. Higher resolution evaluation results in an increasing number of variants of unknown significance.

Original languageEnglish
Pages (from-to)810-817.e4
JournalJournal of Pediatrics
Volume156
Issue number5
DOIs
Publication statusPublished - May 2010
Externally publishedYes

Bibliographical note

Funding Information:
Supported by grants from the FWO ( FWOG.0254.05 ) and the Belgian program of Interuniversity Poles of attraction ( GOA/2006/12 ). K.D. is a senior clinical investigator and J.B. is an aspirant investigator of the FWO Vlaanderen. B.T. is supported by a grant from the IWT Vlaanderen . The other authors declare no conflicts of interest.

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