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Published on: September 7, 2017
Cell specific patterns of methylation in the human placenta
Ariadna Grigoriu1, Jose Carlos Ferreira, Sanaa Choufani
1Department of Obstetrics & Gynecology, Maternal-Fetal Medicine Division, Hospital for Sick Children, Toronto, ON, Canada.
Epigenetics
|December 7, 2010
Summary
DNA methylation patterns in placental cells are cell-type specific, with cytotrophoblasts driving the overall placental methylation profile. This epigenetic regulation impacts gene expression and cell function.
Area of Science:
- Reproductive Biology
- Epigenetics
- Genomics
Background:
- Epigenetic processes, including DNA methylation, are crucial for regulating gene expression.
- Tissue-specific gene expression is a fundamental biological principle.
- The placenta's unique cellular composition suggests potential for cell-type specific epigenetic regulation.
Purpose of the Study:
- To investigate whether DNA methylation is cell-type specific within the human placenta.
- To compare DNA methylation profiles between placental cytotrophoblasts and fibroblasts.
- To identify differentially methylated regions associated with specific placental cell types.
Main Methods:
- Isolation and purification of human placental cytotrophoblasts and fibroblasts.
- DNA methylation profiling using Illumina Methylation27 arrays on isolated cells and whole placental villi.
- Bioinformatic analysis including Euclidean cluster analysis and differential methylation analysis.
- Validation of candidate methylation differences using targeted pyrosequencing.
Main Results:
- Euclidean cluster analysis revealed distinct methylation profiles for cytotrophoblasts and fibroblasts.
- Significant differences in DNA methylation were identified between cytotrophoblasts, fibroblasts, and whole placental villi.
- Specific CpG sites, including those in the promoter of CGB5 and tumor suppressor genes, showed differential methylation.
- The methylation profile of whole placental villi closely resembled that of cytotrophoblasts.
Conclusions:
- DNA methylation is cell-type specific in the human placenta.
- Epigenetic regulation plays a key role in the functional specialization of placental cytotrophoblasts.
- The methylation profile of the placenta is predominantly influenced by cytotrophoblasts.
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