title: Esophageal cancer in Chinese population: no polymorphism in codon 149 of P21(Waf1/Cip1) cyclin dependent kinase gene.
abstract: It has recently been suggested that people of the Indian population who carried the codon 149 polymorphism (GAT-->GGT) of P21(Waf1/Cip1) gene were more susceptible to esophageal cancer and oral cancer than the individuals without that polymorphism. Since esophageal cancer is a high incident neoplasm in China, we analysed the same codon of P21(Waf1/Cip1) in the Chinese population. Blood samples from 80 esophageal cancer patients and 80 normal blood donors were collected for DNA extraction. Methods of Polymerase Chain Reaction (PCR) and direct sequencing were used for detection of the polymorphism in codon 149 of P21(Waf1/Cip1). Bioinformatics analysis was also thoroughly performed for this gene. No polymorphism was found in all samples tested. Bioinformatics analysis revealed that the so-called polymorphism of codon 149 reported previously was a wrong one. In conclusion, no polymorphism exists in codon 149 of P21(Waf1/Cip1). It is not appropriate to use it as a susceptible site of the gene in cancer study.
authors.affiliation: Laboratory of Genetics, Beijing Institute for Cancer Research, School of Oncology, Peking University, Beijing, 100034, China.
authors.forename: Ya-Guang
authors.initials: YG
authors.lastname: Xi
authors.forename: Ke-Yue
authors.initials: KY
authors.lastname: Ding
authors.forename: Ying-Hui
authors.initials: YH
authors.lastname: Ren
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Yang
authors.initials: Y
authors.lastname: Ke
mesh_terms: D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D002681:China; D003062:Codon; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000235:genetics*; D004938:Esophageal Neoplasms / Q000235:genetics*; D005828:Genetics, Population; D006801:Humans; D008969:Molecular Sequence Data; D020641:Polymorphism, Single Nucleotide; D012016:Reference Values
chemical_list: C493956:CDKN1A protein, human; D003062:Codon; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins