In order to identify unknown encoding cDNAs of Cervus nioppon Temminck (sika deer), we constructed a cDNA library of uterus from Jilin-Shuangyang Cervus nippon Temminck using PCR cDNA library kit. PCR products of the library were cloned into pGEM-Teasy vectors and the cDNAs were sequenced and analyzed by nucleotide homology comparison against GenBank Database using the BLAST network service. The results showed that the cDNA library contained cDNA fragments of different lengths and a full length encoding cDNA highly homologous to human sentrin-1/SUMO-1 (small ubiquitin-related modifier 1) was identified. The cDNA was deposited in GenBank under the accession number AF 242526. These show that Cervus nippon Temminck-derived sentrin/SUMO gene has been discovered from PCR cDNA library of uterus from Cervus nippon Temminck.