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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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RNA-Seq and expression microarray highlight different aspects of the fetal amniotic fluid transcriptome [RNA-Seq]

ABSTRACT: The second trimester fetal transcriptome can be assessed based on cell-free RNA found within the amniotic fluid supernatant. The objective of this study was to compare the suitability of two technologies for profiling the human fetal transcriptome: RNA-Seq and expression microarray. Comparisons were based on total numbers of gene detected, rank-order gene expression, and functional genomic analysis. Fewer gene transcripts were observed using RNA-Seq than microarray (4,158 vs 8,842). Correlation of total expression within each sample ranged from R=0.43 to R=0.57. On average, there was 59% concordance in gene identity among the top 10% of genes ranked by expression. The RNA-Seq data yielded more significant pathways enrichment within the ?Physiological Systems Development and Function? categories of IPA. Alternative splicing of many well-known genes, including those previously studied in fetal development, such as H19 and IGF2 is detected by RNA-Seq. Also included in this paper is discussion of the technical challenges inherent to working with cell-free fetal RNA and possible solutions. Cell-free fetal RNA from the amniotic fluid supernatant of five second trimester fetuses was divided and prepared in tandem for analysis using either the Illumina HiSeq 2000 or Affymetrix HG-U133 Plus 2.0 GeneChip microarray.

ORGANISM(S): Homo sapiens

SUBMITTER: Lillian Zwemer

PROVIDER: E-GEOD-49890 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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RNA-Seq and expression microarray highlight different aspects of the fetal amniotic fluid transcriptome [microarray]

Project description:The second trimester fetal transcriptome can be assessed based on cell-free RNA found within the amniotic fluid supernatant. The objective of this study was to compare the suitability of two technologies for profiling the human fetal transcriptome: RNA-Seq and expression microarray. Comparisons were based on total numbers of gene detected, rank-order gene expression, and functional genomic analysis. Fewer gene transcripts were observed using RNA-Seq than microarray (4,158 vs 8,842). Correlation of total expression within each sample ranged from R=0.43 to R=0.57. On average, there was 59% concordance in gene identity among the top 10% of genes ranked by expression. The RNA-Seq data yielded more significant pathways enrichment within the ?Physiological Systems Development and Function? categories of IPA. Alternative splicing of many well-known genes, including those previously studied in fetal development, such as H19 and IGF2 is detected by RNA-Seq. Also included in this paper is discussion of the technical challenges inherent to working with cell-free fetal RNA and possible solutions. Cell-free fetal RNA from the amniotic fluid supernatant of five second trimester fetuses was divided and prepared in tandem for analysis using either the Illumina HiSeq 2000 or Affymetrix HG-U133 Plus 2.0 GeneChip microarray.

2014-05-27 | E-GEOD-49891 | biostudies-arrayexpress

Global Gene Expression Analysis of Term Amniotic Fluid Cell-Free Fetal RNA

Project description:The objective of this study was to identify the tissue expression patterns and biological pathways enriched in term amniotic fluid cell-free fetal RNA by comparing functional genomic analyses of term and second-trimester amniotic fluid supernatants. There were 2,871 significantly differentially regulated genes. In term amniotic fluid, tissue expression analysis showed enrichment of salivary gland, tracheal, and renal transcripts as compared with brain and embryonic neural cells in the second trimester. Functional analysis of genes upregulated at term revealed pathways that were highly specific for postnatal adaptation such as immune function, digestion, respiration, carbohydrate metabolism, and adipogenesis. Inflammation and prostaglandin synthesis, two key processes involved in normal labor, were also activated in term amniotic fluid. This was a prospective whole genome microarray study comparing eight amniotic fluid samples collected from eight women at term who underwent prelabor cesarean delivery and eight second-trimester amniotic fluid samples from routine amniocenteses. A functional annotation tool was used to compare tissue expression patterns in term and second-trimester samples. Pathways analysis software identified physiologic systems, molecular and cellular functions, and upstream regulators that were significantly overrepresented in term amniotic fluid.

2013-04-23 | E-GEOD-46286 | biostudies-arrayexpress

Global Gene Expression Analysis of Term Amniotic Fluid Cell-Free Fetal RNA

2013-04-23 | GSE46286 | GEO

Transcriptome of amniotic fluid in vervet monkey

Project description:Transcriptomic profiling is a crucial tool for understanding growth, development, behavior and predisposition to diseases and the development of health biomarkers. Here, we demonstrate the feasibility of transcriptomic assessment of cell-free fetal RNA in vervet monkey amniotic fluid supernatant (AFS).

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RNA-Seq and expression microarray highlight different aspects of the fetal amniotic fluid transcriptome [microarray]

2014-05-27 | GSE49891 | GEO

RNA-Seq and expression microarray highlight different aspects of the fetal amniotic fluid transcriptome [RNA-Seq]

2014-05-27 | GSE49890 | GEO

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Amniotic fluid RNA gene expression profiling provides insights into the phenotype of Turner syndrome

Project description:Background: Turner syndrome, a common sex chromosome aneuploidy, has characteristics and malformations associated with the phenotype. Fetal amniotic fluid is a complex biological material that could contribute to the understanding Turner syndrome pathogenesis. Global gene expression analysis of Turner syndrome fetal amniotic fluid supernatant was utilized to identify organ systems and specific genes that may play a role in the pathophysiologic changes that are seen in individuals with Turner syndrome. Methods: Global gene expression analysis was performed utilizing cell-free RNA from five midtrimester fetuses with Turner syndrome matched with five euploid female fetuses. Total RNA was extracted, amplified, hybridized onto GeneChipM-BM-. Human Genome U133 Plus 2.0 arrays. Network and pathway analysis of differentially expressed genes were completed. Chromosomal distribution of gene expression differences, differential expression by pathway and organ system (a M-bM-^@M-^\Turner syndrome core transcriptomeM-bM-^@M-^]), and candidate genes that could play a pathological role were identified. Results: There were 470 differentially expressed genes identified in the Turner syndrome transcriptome. The differentially expressed genes were distributed randomly across different chromosomes. Among genes on the X chromosome, XIST was down-regulated, and SHOX not differentially expressed. The most highly represented organ systems were hematologic/immune and neurologic. Increased representation of differentially expressed genes in the hematologic/immune system distinguishes the Turner syndrome transcriptome from the euploid, trisomy 18 and trisomy 21 transcriptomes previously studied in our laboratory. Manual curation of the differentially expressed gene list identified genes including NFATC3, IGFBP5, and LDLR that warrant further study. 2nd trimester amniotic fluid mRNA expression was compared between 5 Turners and 5 euploid fetuses.

2014-06-13 | E-GEOD-58435 | biostudies-arrayexpress

The amniotic fluid transcriptome: a source of novel information about human fetal development

Project description:Amniotic fluid (AF) is a complex biological material that provides a unique window into the developing human. Residual AF supernatant contains cell-free fetal RNA. The objective of this study was to develop an understanding of the AF core transcriptome by identifying the transcripts ubiquitously present in the AF supernatant of euploid midtrimester fetuses. We detected 476 well-annotated genes present in all twelve AF samples. Functional analysis identified 6 physiological systems represented in the AF core transcriptome, including musculoskeletal and nervous system development and function and embryonic/ organismal development. mTOR signaling was identified as a key canonical pathway. Twenty-three highly organ-specific transcripts were identified; six of these are known to be highly expressed by fetal brain. This study demonstrates that AF cell-free fetal RNA can provide biological information about multiple fetal organ systems.

2012-01-11 | GSE33168 | GEO

Expression profiles of amniotic fluid from human fetuses with Down syndrome and euploid controls

Project description:In order to characterize the differences between second trimester Down syndrome (DS) and euploid fetuses, we compared gene expression in uncultured amniotic fluid supernatant samples. We identified individually differentially expressed genes via paired t-tests in the matched samples, and a set of differentially expressed genes on chromosome 21 using Gene Set Enrichment Analysis. Functional pathway analysis of the resulting genes highlighted the importance of oxidative stress, ion transport, and G-protein signaling in the DS fetuses.

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