Background: pregnancy is associated with reduced activity of multiple sclerosis (MS). However, the biological mechanisms underlying this pregnancy-related decrease in disease activity are poorly understood.This data series contains the subset of data used to generate a healthy donors signature comparing female healthy specimens before pregnancy with respect to female healthy specimens at ninth month pregnancy.

Subjects were followed in the outpatients clinic and blood was collected before pregnancy and at the following time points during pregnancy: first trimester (gestational age at sampling 12 weeks), second trimester (24 weeks), and third trimester (36 weeks). Before-pregnancy samples were obtained in a treatment-free period and after anticonceptional drug withdrawal.Peripheral blood mononuclear cells (PBMCs) obtained from 11 women (7 healthy donors before pregnancy and 4 healthy donors at 9th month pregnancy) were analyzed by oligonucleotide microarray technology.

GeneChip Operating Software (GCOS) (Affymetrix, Santa Clara, CA) was used to generate background-normalized image data (CEL files). Microarray quality controls and statistical validation was done using Bioconductor. The presence of hybridization/construction artifacts was evaluated with the fitPLM function (Bioconductor package affyPLM), and the probe (PM) intensity distribution was evaluated using hist function (Bioconductor package affy). Probe set intensities were obtained by means of RMA (Robust Multichip Average) and normalization was done according to the quantiles method.

https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE17409