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Putative cold acclimation pathways in Arabidopsis thaliana identified by a combined analysis of mRNA co-expression patterns, promoter motifs and transcription factors

Artikel i vetenskaplig tidskrift
Författare Aakash Chawade
Marcus Bräutigam
Angelica Lindlöf
Olof Olsson
Björn Olsson
Publicerad i BMC GENOMICS
Volym 8
ISSN 1471-2164
Publiceringsår 2007
Publicerad vid Institutionen för cell- och molekylärbiologi
Institutionen för växt- och miljövetenskaper
Språk en
Länkar dx.doi.org/10.1186/1471-2164-8-304
Ämnesord transgenic potato plants, regulatory networks, gene-expression, low-temperature, dna-binding, phosphate translocator, freezing tolerance, cis-element, cross-talk, activators
Ämneskategorier Genetik, Industriell bioteknik

Sammanfattning

Background With the advent of microarray technology, it has become feasible to identify virtually all genes in an organism that are induced by developmental or environmental changes. However, relying solely on gene expression data may be of limited value if the aim is to infer the underlying genetic networks. Development of computational methods to combine microarray data with other information sources is therefore necessary. Here we describe one such method. Results By means of our method, previously published Arabidopsis microarray data from cold acclimated plants at six different time points, promoter motif sequence data extracted from ~24,000 Arabidopsis promoters and known transcription factor binding sites were combined to construct a putative genetic regulatory interaction network. The inferred network includes both previously characterised and hitherto un-described regulatory interactions between transcription factor (TF) genes and genes that encode other TFs or other proteins. Part of the obtained transcription factor regulatory network is presented here. More detailed information is available in the additional files. Conclusion The rule-based method described here can be used to infer genetic networks by combining data from microarrays, promoter sequences and known promoter binding sites. This method should in principle be applicable to any biological system. We tested the method on the cold acclimation process in Arabidopsis and could identify a more complex putative genetic regulatory network than previously described. However, it should be noted that information on specific binding sites for individual TFs were in most cases not available. Thus, gene targets for the entire TF gene families were predicted. In addition, the networks were built solely by a bioinformatics approach and experimental verifications will be necessary for their final validation. On the other hand, since our method highlights putative novel interactions, more directed experiments could now be performed.

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