MicroRNAs as potential biomarkers for noninvasive detection of fetal trisomy 21

Journal of Assisted Reproduction and Genetics
Ji Hyae LimSo Yeon Park

Abstract

The objective of this study was to discover a panel of microRNAs (miRNAs) as potential biomarkers for noninvasive prenatal testing (NIPT) of trisomy 21 (T21) and to predict the biological functions of identified biomarkers using bioinformatics tools. Using microarray-based genome-wide expression profiling, we compared the expression levels of miRNAs in whole blood samples from non-pregnant women, whole blood samples from pregnant women with euploid or T21 fetuses, and placenta samples from euploid or T21 fetuses. We analyzed the differentially expressed miRNAs according to disease and tissue type (P value <0.05 and two-fold expression change). To predict functions of target genes of miRNAs, the functional annotation tools were used. We identified 299 miRNAs which reasonably separate the whole blood from the placenta. Among the identified miRNAs, 150 miRNAs were up-regulated in the placenta, and 149 miRNAs were down-regulated. Most of the up-regulated miRNAs in the placenta were members of the mir-498, mir-379, and mir-127 clusters. Among the up-regulated miRNAs in the placenta, mir-1973 and mir-3196 were expressed at higher levels in the T21 placenta than in the euploid placenta. The two miRNAs potentially regulate 203 target g...Continue Reading

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