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Related Experiment Videos

Seven placental transcripts characterize HELLP-syndrome.

M Buimer1, R Keijser, J M Jebbink

  • 1Department of Obstetrics and Gynecology, Academic Medical Center, Amsterdam, The Netherlands.

Placenta
|April 1, 2008
PubMed
Summary
This summary is machine-generated.

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Gestational hypertensive diseases like preeclampsia (PE) and HELLP syndrome originate in the placenta. Gene expression analysis revealed a distinct placental molecular signature for HELLP syndrome, suggesting it is a separate disease entity from PE.

Area of Science:

  • Obstetrics and Gynecology
  • Molecular Biology
  • Genetics

Background:

  • Gestational hypertensive diseases, including early-onset preeclampsia (PE) and Hemolysis, Elevated Liver enzymes and Low platelets (HELLP) syndrome, are major causes of maternal and perinatal mortality.
  • The human placenta plays a critical role in the development of these conditions, but the underlying molecular mechanisms remain incompletely understood.

Purpose of the Study:

  • To investigate differences in placental gene expression between normotensive pregnant women and those with PE and HELLP syndrome.
  • To identify a distinct molecular signature for HELLP syndrome within placental tissue.
  • To determine if HELLP syndrome is a variant of PE or a separate disease entity based on placental gene expression.

Main Methods:

  • Serial Analysis of Gene Expression (SAGE) profiling to compare placental tissue from control, HELLP, and PE pregnancies.

Related Experiment Videos

  • Quantitative real-time PCR (sqPCR) to validate the expression levels of differentially expressed transcripts.
  • Nearest centroid classification to identify a molecular signature and assess its discriminatory power.

    • Main Results:

    • Comparison of SAGE profiles identified 404 differentially expressed transcripts between control and HELLP/PE placentas.
    • A specific molecular signature for HELLP syndrome was identified, characterized by upregulated expression of FLT1, LEP, PAPPA2, WWTR1 and downregulated expression of CTNNAL, GSTP1, S100A8.
    • This signature discriminated HELLP placentas from control and PE placentas with a 24% misclassification rate, independent of risk factors.

    Conclusions:

    • The identified placental molecular signature suggests that HELLP syndrome is a distinct disease entity, not merely a variant of PE.
    • These findings provide a foundation for further molecular analysis and understanding of PE and HELLP syndrome.
    • The multigenic nature of these disorders is highlighted by the diverse molecular pathways implicated.