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Background  The function of a novel gene product is typically predicted by transitive assignment of annotation from similar sequences. We describe a novel method, GOtcha, for predicting gene product function by annotation with Gene Ontology (GO) terms. GOtcha predicts GO term associations with term-specific probability (P-score) measures of confidence. Term-specific probabilities are a novel feature of GOtcha and allow the identification of conflicts or uncertainty in annotation.    Results  The GOtcha method was applied to the recently sequenced genome for  Plasmodium falciparum  and six other genomes. GOtcha was compared quantitatively for retrieval of assigned GO terms against direct transitive assignment from the highest scoring annotated BLAST search hit (TOPBLAST). GOtcha exploits information deep into the 'twilight zone' of similarity search matches, making use of much information that is otherwise discarded by more simplistic approaches.  At a P-score cutoff of 50%, GOtcha provided 60% better recovery of annotation terms and 20% higher selectivity than annotation with TOPBLAST at an  E -value cutoff of 10 -4 .    Conclusions  The GOtcha method is a useful tool for genome annotators. It has identified both errors and omissions in the original  Plasmodium falciparum  annotation and is being adopted by many other genome sequencing projects.

GOtcha: a new method for prediction of protein function assessed by the annotation of seven genomes.