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Author Notes:

Corresponding Author: Karen J. Gibbins, MD, MSCI, University of Utah Health, Department of OB/GYN, Division of Maternal-Fetal Medicine, Suite 2B200, 30 North Medical Drive, Salt Lake City, UT 84132, 801-581-8425 (o), Karen.gibbins@hsc.utah.edu.

Comments and views of the author(s) do not necessarily represent the views of the NICHD

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Research Funding:

Supported by grants (HD45925, HD45944, HD45952, HD45953, HD45954, and HD45925) from the Eunice Kennedy Shriver National Institute of Child Health and Human Development

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Obstetrics & Gynecology
  • Pediatrics
  • Smith-Lemli-Opitz
  • stillbirth
  • genetic syndrome
  • cholesterol biosynthesis
  • PRENATAL-DIAGNOSIS
  • REDUCTASE GENE
  • DHCR7
  • CHOLESTEROL
  • FREQUENCY
  • SPECTRUM

Smith-Lemli-Opitz Mutations in Unexplained Stillbirths

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Journal Title:

American Journal of Perinatology

Volume:

Volume 35, Number 10

Publisher:

, Pages 936-939

Type of Work:

Article | Post-print: After Peer Review

Abstract:

Objective Smith-Lemli-Opitz syndrome (SLOS) is an autosomal recessive syndrome caused by a defect in cholesterol biosynthesis with mutations in 7-dehydrocholesterol reductase (DHCR7). A total of 3% of Caucasians carry DHCR7 mutations, theoretically resulting in a homozygote frequency of 1/4000. However, SLOS occurs in only 1/20,000 to 60,000 live births. Our objective was to assess DHCR7 mutations in unexplained stillbirths. Study Design Prospective, multicenter, population-based case-control study of all stillbirths and a representative sample of live births enrolled in five geographic areas. Cases with stillbirth due to obstetric complications, infection, or aneuploidy, and those with poor quality deoxyribonucleic acid (DNA) were excluded. DNA was extracted from placental tissue stored at -80°C, and exons 3 to 9 of the DCHR7 gene were amplified, purified, and subjected to bidirectional sequencing to identify mutations. Results One-hundred forty four stillbirths were unexplained and had adequate DNA for analysis. Nine stillbirths of 139 (6.5%) had a single mutation in one allele in coding exons 3 to 9 of DHCR7 (Table 1). One case (0.7%) was a compound heterozygote for mutations in exons 3 to 9 of DHCR7; this fetus had no clinical or histologic features of SLOS. Conclusion We detected SLOS mutations in only 0.7% of stillbirths. This does not support a strong association between unrecognized DHCR7 mutations and stillbirth.

Copyright information:

© 2018 Georg Thieme Verlag. All rights reserved.

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