PTEN/MMAC1 mutations correlate inversely with an altered p53 tumor suppressor gene in gynecologic tumors.
OBJECTIVE
This study was conducted to evaluate the different mutations of p53 and compare p53 expression in gynecologic tumors in African American and Chinese women.


METHODS
Tumor samples were collected from Atlanta, Ga, hospitals and National Taiwan University Hospital, Taiwan. Samples were examined for different mutations using electrophoretic variants after single-stranded conformational analysis (SSCA). Cell lines obtained from the American Type Culture Collection were also used.


RESULTS
Mutations were identified in the gene for the tumor protein p53 at codons 156, 157, 176, 183, 246, and 248 at sites predicted to disrupt DNA binding. Collectively, an altered p53 status was found in about 28% of all tumors with similar frequencies observed between the African American and Chinese women. African American or Chinese women did not have common polymorphism.


CONCLUSIONS
This study showed that in mutations in the PTEN/MMAC1 gene correlated inversely with an altered p53 status. Similar findings were found in 2 tumor cell lines examined. As p53 changes are associated with late stage cancers, we favor the possibility that in certain tumor subtypes, PTEN/MMAC1 genes alteration may be useful clinically in the evaluation of the tumor.
Soyoola
Emmanuel O
EO
Department of Obstetrics and Gynecology, Morehouse School of Medicine, Atlanta, GA 30310-1495, USA.
Pattillo
Roland A
RA
D044466:Asian People / Q000235:genetics; D001483:Base Sequence / Q000235:genetics; D044383:Black People / Q000235:genetics; D003062:Codon / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D005833:Genital Neoplasms, Female / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D009154:Mutation; D051059:PTEN Phosphohydrolase; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D011110:Polymorphism, Genetic; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*; D025521:Tumor Suppressor Proteins / Q000235:genetics*; D001741:Black or African American
D003062:Codon; D016159:Tumor Suppressor Protein p53; D025521:Tumor Suppressor Proteins; D010744:Phosphoric Monoester Hydrolases; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human