Global DNA Hypermethylation in Down Syndrome Placenta [RNA-Seq]

We have performed genome-wide DNA methylation analysis at single base resolution and gene expression analysis, resulted in hypermethylation in all autosomes in DS samples, mediated by down-regulation of all three TET family genes, and down-regulation of REST/NRSF. Genes located on chr21 were up-regulated by a median of 45% in DS compared to normal villi, while genes with promoter hypermethylation were down regulated. Overall design: Comparison of RNA expression in human placenta between 5 normal and 4 Trisomy 21 samples.