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The human expressed sequence tag (EST) database provides a wealth of resources, which can be used to rapidly screen for potential polymorphisms in proteins of physiological interest. The human p53R2 gene, a recently identified ribonucleotide reductase, plays an important role in DNA repair and is involved in the pathway of p53 activity in response to the presence of DNA damage. On the basis of the alignment of human EST sequences, we identified three candidate polymorphisms at nt 2752, 2759 and 4696 in the 3'-untranslated region of the p53R2 gene. The presence of these polymorphisms was confirmed in a Caucasian population (n = 82) by allele-specific PCR and PCR/restriction fragment length polymorphism analyses. The rare allele frequency at position 4696 (15.5%) is higher than either rare allele frequency at position 2752 or 2759 (6 and 6%). Our results suggest that the human EST data may serve as a valuable source for the rapid identification of genetic variation.

The discovery and confirmation of single nucleotide polymorphisms in the human p53R2 gene by EST database analysis