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Use of the Affymetrix Human GeneChip array and genomic DNA hybridisation probe selection to study ovine transcriptomes

Published online by Cambridge University Press:  04 January 2011

N. S. Graham
Affiliation:
Division of Plant and Crop Sciences, Nottingham Arabidopsis Stock Centre, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, UK
S. T. May
Affiliation:
Division of Plant and Crop Sciences, Nottingham Arabidopsis Stock Centre, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, UK
Z. C. T. R. Daniel
Affiliation:
Division of Nutritional Sciences, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, UK
Z. F. Emmerson
Affiliation:
Division of Plant and Crop Sciences, Nottingham Arabidopsis Stock Centre, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, UK
J. M. Brameld*
Affiliation:
Division of Nutritional Sciences, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, UK
T. Parr
Affiliation:
Division of Nutritional Sciences, School of Biosciences, University of Nottingham, Loughborough, LE12 5RD, UK
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Abstract

Affymetrix GeneChip microarrays are a powerful tool to study global gene expression profiles and have been used on many species. However, no sheep-specific Affymetrix GeneChip is currently available and the bovine array is fairly limited in its coverage and annotation. Previously, a probe-selection method based on hybridisation of genomic DNA (gDNA) was developed, which enables GeneChips to be used for species that they were not designed for. This approach can greatly increase the number of potential annotated genes that can be studied beyond that which is currently available, particularly for species that do not have comprehensively characterised genomes. In this study, we demonstrate that gDNA-based probe selection on the Affymetrix Human U133+2 GeneChip array can be used to study gene expression profiles in sheep tissues. More than 20 000 transcripts were detected in triplicate ovine skeletal muscle and liver samples, which is more than would be possible using the commercially available sheep-specific microarray. The majority of the top 15 differentially expressed genes for each tissue were known to either be expressed in a tissue-specific manner or relate to specific functions of that tissue. Gene ontology analysis of the differentially expressed genes revealed the expected differences in gene expression profiles between the two tissues. Besides demonstrating that the probe selection method can be used to study the ovine transcriptome, the benefits of this approach are that it can greatly increase the number of annotated and novel genes that can be studied beyond those currently possible using ovine- or bovine-specific microarrays. This same method also has the potential to allow the study of other species where species-specific microarrays are not available or whose genomes have not been comprehensively characterised.

Type
Full Paper
Copyright
Copyright © The Animal Consortium 2011

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