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Differentially expressed mRNA transcripts in the placenta delivered by preterm versus term spontaneous labour - GSE18809

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Differentially expressed mRNA transcripts in the placenta delivered by preterm versus term spontaneous labour - GSE18809
Purpose

We hypothesized that preterm spontaneous labor involves aberrant changes in mRNA expression in the placenta. To test this hypothesis, we interrogated the mRNA levels of >50,000 genes and transcript variants using gene expression microarray (Human Genome U133 Plus 2.0 Array, Affymetrix) on 5 placentas collected from preterm spontaneous delivery (<34 weeks of gestation) and another 5 placentas collected from term spontaneous delivery (38-39 weeks).We have identified 229 and 162 genes that were up- or down-regulated, respectively, for more than 3-fold in the preterm placentas compared to the term placentas (Mann-Whitney Rank Sum Test, with multiple testing correction by the Benjamini-Hochberg method, adjusted p-value <= 0.05).
Experimental Design

Placentas collected from (i) preterm spontaneous delivery (<34 weeks of gestation) and (ii) term spontaneous delivery (38-39 weeks of gestation) were subjected to RNA extraction and hybridization on Affymetrix microarrays. To identify gene expression patterns that are commonly involved in preterm spontaneous labour, we analyzed 5 placentas from each of these 2 groups and tested for any differentially expressed genes by Mann-Whitney Rank Sum Test.
Platform Affymetrix HG-U133_Plus_2
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