Fetal medicine

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Clinical utility of array comparative genomic hybridisation for prenatal diagnosis: a cohort study of 3171 pregnancies

  1. C-N Lee1,
  2. S-Y Lin2,3,
  3. C-H Lin1,
  4. J-C Shih1,
  5. T-H Lin1,
  6. Y-N Su4,5

Article first published online: 7 FEB 2012

DOI: 10.1111/j.1471-0528.2012.03279.x

Issue

BJOG: An International Journal of Obstetrics & Gynaecology

BJOG: An International Journal of Obstetrics & Gynaecology

Volume 119, Issue 5, pages 614–625, April 2012

Additional Information

How to Cite

Lee, C.-N., Lin, S.-Y., Lin, C.-H., Shih, J.-C., Lin, T.-H. and Su, Y.-N. (2012), Clinical utility of array comparative genomic hybridisation for prenatal diagnosis: a cohort study of 3171 pregnancies. BJOG: An International Journal of Obstetrics & Gynaecology, 119: 614–625. doi: 10.1111/j.1471-0528.2012.03279.x

Author Information

  1. 1

    Department of Obstetrics and Gynaecology, National Taiwan University Hospital, Taipei, Taiwan

  2. 2

    Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan

  3. 3

    Department of Obstetrics and Gynaecology, Hsin-Chu branch, National Taiwan University Hospital, Hsin Chu, Taiwan

  4. 4

    Graduate Institute of Clinical Genomics, National Taiwan University, Taipei, Taiwan

  5. 5

    Department of Medical Genetics, National Taiwan University Hospital, Taipei, Taiwan

*Dr Y-N Su, Graduate Institute of Clinical Genomics, National Taiwan University, No. 8 Chung-Shan South Road, Taipei, Taiwan. Email ynsu@ntu.edu.tw

Publication History

  1. Issue published online: 12 MAR 2012
  2. Article first published online: 7 FEB 2012
  3. Accepted 5 December 2011. Published Online 7 February 2012.

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Keywords:

  • Array comparative genomic hybridisation;
  • chromosomal abnormalities;
  • fetal ultrasound;
  • prenatal;
  • prenatal cytogenetics

Please cite this paper as: Lee C, Lin S, Lin C, Shih J, Lin T, Su Y. Clinical utility of array comparative genomic hybridisation for prenatal diagnosis: a cohort study of 3171 pregnancies. BJOG 2012;119:614–625.

Objective  To evaluate the clinical value of prenatal array comparative genomic hybridisation (CGH) in screening for submicroscopic genomic imbalances.

Design  Cross-sectional study.

Setting  Tertiary referral centre.

Population  From June 2008 to February 2011, 3171 fetuses underwent prenatal array CGH testing and karyotyping at the National Taiwan University Hospital. Indications for invasive prenatal diagnosis included abnormal karyotype, abnormal ultrasound, advanced maternal age and parental anxiety.

Methods  In all, 2497 fetuses were screened with 1-Mb resolution bacterial artificial chromosome array-based CGH, and 674 fetuses with 60-K oligonucleotide array-based CGH. Multiplex ligation-dependent probe amplification, fluorescence in situ hybridization, or 105-K oligonucleotide array CGH provided further confirmation.

Main outcome measure  Copy number variations identified by array CGH.

Results  Array CGH detected numerical chromosome anomalies in 37 (1.2%) fetuses, microdeletion/duplication in 34 (1.1%) fetuses, large deletion/duplication in 13 (0.4%) fetuses, benign copy number changes in 13 (0.4%) fetuses and variation of unknown clinical significance in five (0.2%) fetuses. Array CGH was effective in identifying submicroscopic genomic imbalance in fetuses with de novo balance translocations (2/17, 1.8%), supernumerary marker chromosomes (3/6, 50%), and abnormal prenatal ultrasound findings (33/194, 17.0%). Array CGH detected microdeletions/duplications in 12 fetuses with normal karyotype.

Conclusion  Prenatal array CGH is effective in screening for submicroscopic genomic imbalance. Array CGH may add 8.2% to the diagnostic field, compared with conventional karyotyping, for fetuses with abnormal ultrasound results, and is particularly useful in fetuses with karyotypic balanced translocation or marker chromosomes. There is a 0.52% baseline risk of submicroscopic genomic imbalance, even in women with an uneventful prenatal examination.

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