Impact of Mir196a-2 Genotypes on Colorectal Cancer Risk in Taiwan.

Area of Science:

• Genetics
• Molecular Biology
• Cancer Research

Background:

• Colorectal cancer (CRC) is a major global health concern.
• MicroRNAs (miRNAs) play crucial roles in cancer development.
• Specific miRNA gene polymorphisms may influence CRC susceptibility.

Purpose of the Study:

• To investigate the association between specific genotypes of mir146a (rs2910164) and mir196a-2 (rs11614913) and colorectal cancer (CRC) risk.
• To evaluate the correlation between mir196a-2 genotypes and its serum expression levels.
• To assess potential interactions between these genotypes and demographic/lifestyle factors in CRC risk.

Main Methods:

• Genotyping of mir146a rs2910164 and mir196a-2 rs11614913 using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
• Case-control study involving 362 CRC patients and 362 healthy controls.
• Quantification of serum mir196a-2 expression using quantitative reverse transcription-PCR (qRT-PCR).
• Logistic regression analysis to determine odds ratios (OR) and confidence intervals (CI).

Main Results:

• The mir196a-2 rs11614913 CC genotype was associated with a 2.04-fold increased risk of CRC (p=0.0008).
• Carriers of the CT + CC genotypes of mir196a-2 showed a significant association with CRC risk (OR=1.46, p=0.0261).
• Individuals with the CC genotype exhibited significantly higher serum mir196a-2 levels compared to TT genotype carriers (p<0.0001), indicating a genotype-phenotype correlation.
• No significant association was found for mir146a rs2910164 genotypes with CRC risk.

Conclusions:

• The mir196a-2 rs11614913 polymorphism is a potential predictive biomarker for colorectal cancer risk.
• Elevated serum mir196a-2 levels in CC genotype carriers suggest a functional link to CRC development.
• Further research is warranted to explore the clinical utility of mir196a-2 genotypes in CRC risk assessment.