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. 2008 Apr 11;9:163. doi: 10.1186/1471-2164-9-163

Table 6.

Classification of candidate ORFs into categories, according to several criteria.

Functional annotation (A)
Comparison of the previous functional annotations for the candidate ORFs [5] with the function of interest
A function assigned to the candidate ORF consistent with function of interest
A* function assigned to the candidate ORF not contradicting function of interest (e.g. aldose reductase versus xylose reductase; mitochondrial isocitrate dehydrogenase versus cytosolic isocitrate dehydrogenase)
A-NA no function assigned to the candidate ORF (e.g. hypothetical protein)
A-X function assigned to the candidate ORF not consistent with function of interest

Protein families (F)

Comparison of the protein domains originally predicted for the candidate ORF [5] with those of the enzymes catalysing the function of interest [6]
F protein family of candidate ORF consistent with protein family of function of interest
F-NA no protein family associated to the candidate ORF
F-X protein family of candidate ORF not consistent with protein family of function of interest

Comparative genomics with yeast (Y)

BLASTP searches of all proteins in S. cerevisiae [35] against all predicted proteins in A. nidulans [5]
Y function of the protein in yeast (that has a match with the candidate ORF) consistent with missing function
Y* function of the protein in yeast (that has a match with the candidate ORF) not contradicting missing function (e.g. aldose reductase versus xylose reductase; mitochondrial isocitrate dehydrogenase versus cytosolic isocitrate dehydrogenase)
Y-NA no match of protein in yeast with the candidate ORF
Y-X function of the protein in yeast (that has a match with the candidate ORF) not consistent with missing function

Comparative genomics with other organisms (O)

BLASTP searches of candidate ORF in A. nidulans against (non-redundant) protein database at NCBI [26]
O functions of proteins in other organisms (that have a match with the candidate ORF) consistent with missing function
O* functions of proteins in other organisms (that have a match with the candidate ORF) not contradicting missing function (e.g. aldose reductase versus xylose reductase; mitochondrial isocitrate dehydrogenase versus cytosolic isocitrate dehydrogenase)
O-NA no matches of candidate ORF with proteins in other organisms
O-X functions of proteins in other organisms (that have a match with the candidate ORF) not consistent with missing function