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An approach towards experimental cDNA sequence determination of predicted genes: an example from Arabidopsis U3-55k homologues.

Gene. 2005 Sep 26;358:67-72
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摘要


Experimental cDNA sequence determinations lag behind in silico gene structure predictions in some recently sequenced genomes. This may be due in part to low transcript abundance and/or the severely spatio-temporarily restricted expression pattern of some genes. Here we characterize the predicted repressed gene of Arabidopsis thaliana (At4g21130) that encodes a homologue of the Arabidopsis U3-55K-like protein (At4g05410) and of the U3-55K (RNU3IP2, Rrp9p) proteins from other eukaryotes. In man and yeast, U3-55K is involved in the processing of the pre-ribosomal RNA. Here we show that treatment with inhibitors of histone deacetylases (trichostatin A, sodium butyrate) or DNA methyltransferases (5-aza-2'-deoxycytidine) induces a low but distinct level of mRNA from the repressed Arabidopsis At4g21130 locus, which can be detected by RT-PCR amplification. Direct sequencing of PCR products reveals the open reading frame that differs, in part, from the hypothetical one and encodes a seven-WD-repeat protein highly conserved when compared to U3-55K proteins from various eukaryotic species. This suggests the conservation of its function. The described approach may help to determine the nucleotide sequences of transcripts from predicted genes with a low level of expression.

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