Exome sequencing analysis on products of conception: a cohort study to evaluate clinical utility and genetic etiology for pregnancy loss

Abstract

Purpose

Pregnancy loss ranging from spontaneous abortion (SAB) to stillbirth can result from monogenic causes of Mendelian inheritance. This study evaluated the clinical application of exome sequencing (ES) in identifying the genetic etiology for pregnancy loss.

Methods

A cohort of 102 specimens from products of conception (POC) with normal karyotype and absence of pathogenic copy-number variants were selected for ES. Abnormality detection rate (ADR) and variants of diagnostic value correlated with SAB and stillbirth were evaluated.

Results

ES detected 6 pathogenic variants, 16 likely pathogenic variants, and 17 variants of uncertain significance favor pathogenic (VUSfp) from this cohort. The ADR for pathogenic and likely pathogenic variants was 22% and reached 35% with the inclusion of VUSfp. The ADRs of SAB and stillbirth were 36% and 33%, respectively. Affected genes included those associated with multisystem abnormalities, neurodevelopmental disorders, cardiac anomalies, skeletal dysplasia, metabolic disorders, and renal diseases.

Conclusion

These results supported the clinical utility of ES for detecting monogenic etiology of pregnancy loss. The identification of disease-associated variants provided information for follow-up genetic counseling of recurrence risk and management of subsequent pregnancies. Discovery of novel variants could provide insight for underlying molecular mechanisms causing fetal death.

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Fig. 1: A scheme for variant annotation, filtering and classification.
Fig. 2: Clinical demographics for the 102 products of conception (POC) cases.

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Correspondence to Winifred Mak MD, PhD or Allen E. Bale MD, PhD or Hui Zhang MD, PhD or Peining Li PhD.

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Zhao, C., Chai, H., Zhou, Q. et al. Exome sequencing analysis on products of conception: a cohort study to evaluate clinical utility and genetic etiology for pregnancy loss. Genet Med (2020). https://doi.org/10.1038/s41436-020-01008-6

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Keywords

  • exome sequencing (ES)
  • pregnancy loss
  • products of conception (POC)
  • abnormality detection rate (ADR)
  • genetic etiology

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