P53 codon 249 mutation in hepatocellular carcinomas from Nigeria

Area of Science:

• Oncology
• Hepatology
• Molecular Biology

Background:

• The p53 tumor suppressor gene is frequently mutated in hepatocellular carcinoma (HCC).
• A specific p53 codon 249 mutation is common in HCC from regions with high aflatoxin exposure and hepatitis B virus endemicity.
• Hepatocellular carcinoma is a significant health concern in Nigeria.

Purpose of the Study:

• To determine the frequency of the p53 codon 249 mutation in Nigerian patients diagnosed with hepatocellular carcinoma.
• To investigate the potential role of aflatoxins in hepatocarcinogenesis in Nigeria.

Main Methods:

• Tumor samples were collected from 18 Nigerian patients with histologically confirmed HCC.
• DNA was extracted from tumor tissues, and exon 7 of the p53 gene was amplified using nested polymerase chain reaction.
• Restriction enzyme analysis was performed to detect the p53 codon 249 mutation.

Main Results:

• The p53 codon 249 mutation was detected in 1 out of 18 tumor samples, representing a frequency of 5.5%.
• Fourteen of the 18 patients had co-existing cirrhosis.
• The study included samples from autopsy (n=14), surgical resection (n=3), and liver biopsy (n=1).

Conclusions:

• The low frequency of the p53 codon 249 mutation in Nigerian HCC patients suggests a limited role for aflatoxins in hepatocarcinogenesis in this population, particularly in the Southwest region.
• Further research is needed to elucidate the specific etiological factors contributing to HCC in Nigeria.
• The findings contribute to understanding the geographical variations in HCC development and its molecular mechanisms.