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Nucleic Acids Res. 2014 Mar;42(5):e31. doi: 10.1093/nar/gkt992. Epub 2013 Oct 28.

WISECONDOR: detection of fetal aberrations from shallow sequencing maternal plasma based on a within-sample comparison scheme.

Author information

1
Delft Bioinformatics Lab, Delft University of Technology, Mekelweg 4, 2628 CD Delft, The Netherlands, Department of Clinical Genetics, VU University Medical Center Amsterdam, van der Boechorststraat 7 (BS7/J377), 1081 BT Amsterdam, The Netherlands and Department of Clinical Chemistry, VU University Medical Center Amsterdam, van der Boechorststraat 7 (BS7/J377), 1081 BT Amsterdam, The Netherlands.

Abstract

Genetic disorders can be detected by prenatal diagnosis using Chorionic Villus Sampling, but the 1:100 chance to result in miscarriage restricts the use to fetuses that are suspected to have an aberration. Detection of trisomy 21 cases noninvasively is now possible owing to the upswing of next-generation sequencing (NGS) because a small percentage of fetal DNA is present in maternal plasma. However, detecting other trisomies and smaller aberrations can only be realized using high-coverage NGS, making it too expensive for routine practice. We present a method, WISECONDOR (WIthin-SamplE COpy Number aberration DetectOR), which detects small aberrations using low-coverage NGS. The increased detection resolution was achieved by comparing read counts within the tested sample of each genomic region with regions on other chromosomes that behave similarly in control samples. This within-sample comparison avoids the need to re-sequence control samples. WISECONDOR correctly identified all T13, T18 and T21 cases while coverages were as low as 0.15-1.66. No false positives were identified. Moreover, WISECONDOR also identified smaller aberrations, down to 20 Mb, such as del(13)(q12.3q14.3), +i(12)(p10) and i(18)(q10). This shows that prevalent fetal copy number aberrations can be detected accurately and affordably by shallow sequencing maternal plasma. WISECONDOR is available at bioinformatics.tudelft.nl/wisecondor.

PMID:
24170809
PMCID:
PMC3950725
DOI:
10.1093/nar/gkt992
[Indexed for MEDLINE]
Free PMC Article

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