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Evaluating DNA methylation and gene expression variability in the human term placenta.

L Avila1, R K Yuen, D Diego-Alvarez

  • 1Department of Medical Genetics, University of British Columbia, Child & Family Research Institute, 950 West 28th Ave.,Vancouver, BC, Canada.

Placenta
|October 16, 2010
PubMed
Summary

Placental gene expression and DNA methylation show significant within-tissue variability. Processing time impacts mRNA levels, while DNA methylation remains stable, highlighting critical factors for molecular studies.

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Area of Science:

  • Reproductive Biology
  • Epigenetics
  • Molecular Biology

Background:

  • Placental gene expression studies face challenges from within-tissue variability and sampling methods.
  • DNA methylation, an epigenetic regulator, may also exhibit variability but is less understood in the placenta.

Purpose of the Study:

  • To investigate within- and between-placenta variation in gene expression and DNA methylation.
  • To assess the impact of sample location and processing time on these molecular measures.

Main Methods:

  • Analyzed gene expression (real-time PCR) and DNA methylation (pyrosequencing) in samples from 38 term placentae.
  • Quantified expression of CDH1, CDH11, ID2, PLAC1, KISS1 and methylation of LINE1, KISS1, PTPN6, CASP8, APC.

Main Results:

  • Significant within-placenta correlations for both gene expression and DNA methylation were observed.
  • Sample location had minimal impact, but processing time significantly affected mRNA levels (PLAC1, KISS1).
  • DNA methylation levels were relatively stable over the 24-hour processing period.

Conclusions:

  • Multiple sampling sites are essential for accurate placental molecular studies due to site-to-site variability.
  • Rapid mRNA degradation necessitates careful consideration of post-delivery processing time.
  • Observed variations may reflect differences in cell composition rather than solely cellular-level epigenetic or expression changes.