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- W164032496 abstract "Information on gene expression in brain of patients with Down Syndrome (DS, trisomy 21) is limited and molecular biological research is focussing on mapping and sequencing chromosome 21. The information on gene expression in DS available follows the current concept of a gene dosage effect due to a third copy of chromosome 21 claiming overexpression of genes encoded on this chromosome. Based upon the availability of fetal brain and recent technology of gene hunting, we decided to use subtractive hybridization to evaluate differences in gene expression between DS and control brains. Subtractive hybridization was applied on two fetal brains with DS and two age and sex matched controls, 23rd week of gestation, and mRNA steady state levels were evaluated generating a subtractive library. Subtracted sequences were identified by gene bank and assigned by alignments to individual genes. We found a series of up- and downregulated sequences consisting of chromosomal transcripts, enzymes of intermediary metabolism, hormones, transporters/channels and transcription factors (TFs). We show that trisomy 21 or aneuploidy leads to the deterioration of gene expression and the derangement of transcripts described describes the involvement of chromosomes other than chromosome 21, explains impairment of transport, carriers, channels, signaling, known metabolic and hormones imbalances. The dys-coordinated expression of transcription factors including homeobox genes, POU-domain TFs, helix-loop-helix-motifs, LIM domain containing TFs, leucine zippers, forkhead genes, maybe of pathophysiological significance for abnormal brain development and wiring found in patients with DS. This is the first description of the concomitant expression of a large series of sequences indicating disruption of the concerted action of genes in that disorder." @default.
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- W164032496 date "1999-01-01" @default.
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- W164032496 title "Gene expression in fetal Down Syndrome brain as revealed by subtractive hybridization" @default.
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- W164032496 doi "https://doi.org/10.1007/978-3-7091-6380-1_8" @default.
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