Association of specific p53 polymorphisms with keratosis in individuals exposed to arsenic through drinking water in West Bengal, India.
Although, more than six million people are endemically exposed to inorganic arsenic in West Bengal, India by drinking heavily contaminated groundwater, only about 300,000 people show arsenic induced skin lesions. This suggests that genetic variability plays an important role in arsenic induced skin lesions and skin cancers. Arsenic induced keratosis is considered as a possible precancerous state of in situ carcinoma. Several reports have suggested the role of p53 polymorphisms as potential marker for risk assessment of different types of cancers. This prompted us to study the association of three p53 polymorphisms with arsenic induced keratosis in a population exposed to arsenic through drinking water. A total of 366 unrelated individuals (177 individuals with arsenic induced keratosis and 189 individuals with no arsenic induced skin lesions) were recruited from North 24 Parganas, Nadia and Murshidabad districts between January 2003 and February 2005 for the study of the genotypic distribution of three p53 polymorphisms (16bp duplication at intron 3, codon 72 Arg/Pro and G>A at intron 6 [nt 13,494]) by PCR-RFLP. The arginine homozygous genotype at codon 72, and homozygous genotype of no duplication polymorphism at intron 3 were over represented in the individuals with keratosis compared with individuals with no skin lesions (OR=2.086; 95% CI=1.318-3.299 and OR=2.086; 95% CI=1.257-3.457, respectively). This study indicates that individuals carrying the arginine homozygous genotype at codon 72, and/or no duplication homozygous genotype at intron 3 are at risk for the development of arsenic induced keratosis.
De Chaudhuri
Sujata
S
Molecular and Human Genetics Division, Indian Institute of Chemical Biology, 4, Kolkata, India.
Mahata
Julie
J
Das
Jayanta K
JK
Mukherjee
Angshuman
A
Ghosh
Papiya
P
Sau
Tanmoy Jyoti
TJ
Mondal
Lakshmikanta
L
Basu
Santanu
S
Giri
Ashok K
AK
Roychoudhury
Susanta
S
D000328:Adult; D001151:Arsenic / Q000008:administration & dosage*; D003062:Codon / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease / Q000235:genetics; D005838:Genotype; D006239:Haplotypes / Q000235:genetics; D006801:Humans; D007194:India; D007642:Keratosis / Q000139:chemically induced / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000187:drug effects / Q000235:genetics*; D012867:Skin / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D012871:Skin Diseases / Q000139:chemically induced / Q000235:genetics; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*; D014874:Water Pollutants, Chemical / Q000008:administration & dosage*
D003062:Codon; D016159:Tumor Suppressor Protein p53; D014874:Water Pollutants, Chemical; D001151:Arsenic