Cornelia de Lange syndrome affects multiple parts of the body, resulting in characteristic facial features, limb defects, growth retardation, and intellectual disability.  Genetic testing can help to confirm a diagnosis and aid in genetic counseling for a family.
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Test Code 7040
Turnaround Time (TAT) 14-21 days
Number of Genes 5

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We now offer single site analysis (SSA) at no additional cost to family members

following single gene or panel testing* of the first family member (proband) within 90 days of the original Ambry report date.

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*excludes Secondary Findings and SNP Array tests

Test Description

Our Cornelia de Lange Syndrome panel includes next generation sequencing (NGS) and deletion/duplication analysis of the NIPBL, SMC1A, HDAC8, RAD21, and SMC3 genes. Genomic deoxyribonucleic acid (gDNA) is isolated from the patient’s specimen using standardized methodology and quantified. Sequence enrichment of the targeted coding exons and adjacent intronic nucleotides is carried out by a bait-capture methodology using long biotinylated oligonucleotide probes, and is followed by polymerase chain reaction (PCR) and Next-Generation sequencing. Additional Sanger sequencing is performed for any regions missing or with insufficient read depth coverage for reliable heterozygous variant detection. Reportable small insertions and deletions, potentially homozygous variants, variants in regions complicated by pseudogene interference, and single nucleotide variant calls not satisfying 100x depth of coverage and 40% het ratio thresholds are verified by Sanger sequencing.1 Gross deletion/duplication analysis for all genes is performed using a custom pipeline based on read-depth from NGS data and/or targeted chromosomal microarray with confirmatory MLPA when applicable. 

  1. Mu W, et al. Sanger confirmation is required to achieve optimal sensitivity and specificity in next-generation sequencing panel testing. J Mol Diagn. 2016. 18(6):923-932.
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