Journal Article

Dichloroacetic acid reduces Ha-ras codon 61 mutations in liver tumors from female B6C3F1 mice.

M Schroeder, A B DeAngelo and M J Mass

in Carcinogenesis

Volume 18, issue 8, pages 1675-1678
Published in print August 1997 | ISSN: 0143-3334
Published online August 1997 | e-ISSN: 1460-2180 | DOI:
Dichloroacetic acid reduces Ha-ras codon 61 mutations in liver tumors from female B6C3F1 mice.

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Dichloroacetic acid (DCA), a disinfection by-product of chlorination found in drinking water, is a hepatocarcinogenic in the B6C3F1 mouse. Previous studies have shown that DCA does not significantly alter the incidence of Ha-ras codon 61 mutations in male mouse liver carcinomas from that observed in spontaneous tumors (approximately 50% have Ha-ras mutations) but it alters the proportions of mutations that occur in Ha-ras codon 61. Twenty-two tumors were produced in female B6C3F1 mice after treatment with 3.5 g DCA per liter of drinking water over a period of 104 weeks. To detect potential Ha-ras mutations in the liver tumor tissue of female B6C3F1 mice, genomic DNA was isolated from tumors that had been frozen. The polymerase chain reaction (PCR) and single-stranded conformational polymorphism (SSCP) was used to screen tumor DNA for mutations in Ha-ras exon 2. In DNA from liver tumors in female B6C3F1 mice induced by DCA-treatment we found only one mutation in exon 2 among the 22 tumors analyzed (4.5%). Direct-sequencing of exon 2 revealed a CAA to CTA transversion in Ha-ras codon 61. The result of this study indicates that tumor formation in DCA-treated female B6C3F1 mice is, therefore, not associated with a mutationally activated Ha-ras codon 61. This result differs from previous results obtained in male B6C3F1 mice.

Journal Article.  0 words. 

Subjects: Clinical Cytogenetics and Molecular Genetics

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