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Published on: June 15, 2011
Comprehensive prenatal diagnostics: Exome versus genome sequencing.
Ieva Miceikaite1,2, Christina Fagerberg2, Charlotte Brasch-Andersen1,2
1Department of Clinical Research, Clinical Genome Center & Human Genetics Unit, Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark.
Trio whole exome sequencing (WES) and whole genome sequencing (WGS) significantly improve prenatal diagnosis for fetal anomalies, offering a higher diagnostic yield than chromosomal microarray (CMA). These advanced genetic tests show promise as standalone diagnostic methods.
Area of Science:
- Genetics
- Prenatal Diagnosis
- Genomic Medicine
Background:
- Fetal anomalies require accurate genetic diagnosis for appropriate management.
- Conventional methods like chromosomal microarray (CMA) have limitations in detecting certain genetic variations.
Purpose of the Study:
- To compare the diagnostic yield of trio whole exome sequencing (WES) and trio whole genome sequencing (WGS) against CMA for fetal anomalies.
- To evaluate WES/WGS as potential standalone prenatal diagnostic tools.
Main Methods:
- Included 40 pregnancies with fetal anomalies or increased nuchal translucency (≥5 mm) between 12-21 weeks of gestation.
- Performed trio WES/WGS and CMA on all participants.
Main Results:
- Trio WES/WGS increased the diagnostic yield by 25% in cases with negative CMA results.
- Overall diagnostic yield for WES/WGS was 40%, identifying genetic sequence variants, copy number variants, or aneuploidies.
- WES demonstrated superior detection of mosaic variants compared to WGS due to higher sequencing depth.
Conclusions:
- Prenatal WES/WGS are powerful tools for diagnosing fetal anomalies, exceeding CMA's diagnostic yield.
- WES/WGS show potential as standalone methods for prenatal genetic testing.
- Limitations of WGS in detecting mosaic variants were noted, particularly for chorionic villus samples.
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