Objective: The objective of this study was to assess the first formal approach for monitoring genetic/developmental syndromes associated with the presence of an increased nuchal translucency (NT) thickness (>3 mm) in the first trimester of pregnancy.
Methods: Multiple technologies-a DNA chip using the APEX technology, qPCR, microfluidic PCR, and sequencing-were applied to assay 310 mutations across five conditions-Noonan syndrome, congenital adrenal hyperplasia, spinal muscular atrophy (SMA), DiGeorge syndrome, and Smith-Lemli Opitz syndrome.
Results: We report the results of assessing the first 120 patients in which 8 cases of Noonan syndrome were detected as well as an unusually high rate of heterozygosity for SMA.
Conclusion: While testing for Noonan syndrome in association with increased NT appears warranted, the reported association of the remaining four genetic syndromes is likely to be weak and possibly insignificant.
Copyright © 2011 John Wiley & Sons, Ltd.