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Background  Exposure of cells to environmental stress conditions can lead to the interruption of several intracellular processes, in particular those performed by macromolecular complexes such as the spliceosome.    Results  During nucleotide sequencing of cDNA libraries constructed using RNA isolated from  B. emersonii  cells submitted to heat shock and cadmium stress, a large number of ESTs with retained introns was observed. Among the 6,350 ESTs obtained through sequencing of stress cDNA libraries, 181 ESTs presented putative introns (2.9%), while sequencing of cDNA libraries from unstressed  B. emersonii  cells revealed only 0.2% of ESTs containing introns. These data indicate an enrichment of ESTs with introns in  B. emersonii  stress cDNA libraries. Among the 85 genes corresponding to the ESTs that retained introns, 19 showed more than one intron and three showed three introns, with intron length ranging from 55 to 333 nucleotides. Canonical splicing junctions were observed in most of these introns, junction sequences being very similar to those found in introns from genes previously characterized in  B. emersonii , suggesting that inhibition of splicing during stress is apparently a random process. Confirming our observations, analyses of  gpx3  and  hsp70  mRNAs by Northern blot and S1 protection assays revealed a strong inhibition of intron splicing in cells submitted to cadmium stress.    Conclusion  In conclusion, data indicate that environmental stresses, particularly cadmium treatment, inhibit intron processing in  B. emersonii , revealing a new adaptive response to cellular exposure to this heavy metal.

Environmental stresses inhibit splicing in the aquatic fungus Blastocladiella emersonii