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Evaluating cross-hybridization of murine cDNA to the Affymetrix Human Genome U133 Plus 2.0 chipset

ABSTRACT: Transcriptomic studies of human tumor xenografts are complicated by the presence of murine cellular mRNA. As such, it is useful to know the extent to which mouse mRNA cross-hybridizes to any given array platform. In this study, murine cDNA samples from diverse sources were hybridized to Affymetrix Human Genome U133 Plus 2.0 Arrays. In this regard it is possible to identify specific probes that are potential targets of cross-species interference.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE49353 | GEO | 2013/07/31

SECONDARY ACCESSION(S): PRJNA213716

REPOSITORIES: GEO

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Evaluating cross-hybridization of murine cDNA to the Affymetrix Human Genome U133 Plus 2.0 chipset

Project description:Transcriptomic studies of human tumor xenografts are complicated by the presence of murine cellular mRNA. As such, it is useful to know the extent to which mouse mRNA cross-hybridizes to any given array platform. In this study, murine cDNA samples from diverse sources were hybridized to Affymetrix Human Genome U133 Plus 2.0 Arrays. In this regard it is possible to identify specific probes that are potential targets of cross-species interference. Array data was generated for 5 different mouse cDNAs and 5 different human cDNAs hybridized to human Affymetrix U133 Plus 2 arrays [3 replicates for each biological sample]. Samples included A) mouse and B) human universal RNA (Strategene, La Jolla, CA), C) B16F10 murine melanoma tumor and D) skin from same model [C57BL/6 mice] E) COLON-26 murine tumor xenograft and F) skin from same model [Balb/C mice] G) NCI-H522 human lung carcinoma xenograft and H) skin from same model (nude mice) I) LOX-IMVI human melanoma xenograft and J) skin from same model (nude mice).

2013-07-31 | E-GEOD-49353 | biostudies-arrayexpress

Evaluating cross-hybridization of murine cDNA to the Affymetrix Human Genome U133 Plus 2.0 chipset

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Evaluating cross-hybridization of murine cDNA to the Affymetrix Human Genome U133 Plus 2.0 chipset

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Spermatozoal RNA Profiles (U133 Plus 2.0 Array)

Project description:Normal human spermatogenesis concludes with the formation of large numbers of morphologically well developed spermatozoa. While transcriptionally quiescent these cells carry an RNA payload that reflects the final spermiogenic phase of transcription. We report here the spermatozoal transcript profiles characteristic of normally fertile individuals and infertile males suffering from a consistent and severe teratozoospermia in which under 4% of spermatozoa are morphologically normal. RNA was extracted from the purified sperm cells of ejaculate and hybridized to Affymetrix U133 (v2) Microarrays. Keywords: disease state analysis

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Project description:One of the biggest problems facing microarray experiments is the difficulty of translating results into other microarray formats or comparing microarray results to other biochemical methods. We believe that this is largely the result of poor gene identification. We re-identified the probesets on the Affymetrix U133 plus 2.0 GeneChip array. This identification was based on the sequence of the probes and the sequence of the human genome. Using the BLAST program, we matched probes with documented and postulated human transcripts. This resulted in the redefinition of approximately 37% of the probes on the U133 plus 2.0 array. This updated identification specifically points out where the identification is complicated by cross-hybridization from splice variants or closely related genes. More than 5000 probesets detect multiple transcripts and therefore the exact protein affected cannot be readily concluded from the performance of one probeset alone. This makes naming difficult and impacts any downstream analysis such as associating gene ontologies, mapping affected pathways or simply validating expression changes. We have now automated the sequence-based identification and can more appropriately annotate any array where the sequence on each spot is known.

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Project description:CD34-positive fractions were used for mRNA preparation, which was hybridized to HGU 133 Plus 2.0 arrays. Keywords: Disease state analysis

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AML genome hybridization to HGU133 Plus 2.0

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