Comparing techniques for the identification of the MTHFR A1298C polymorphism

Area of Science:

• Genetics
• Molecular Biology
• Medical Science

Background:

• The methylenetetrahydrofolate reductase (MTHFR) A1298C polymorphism is clinically relevant.
• Restriction fragment length polymorphism (RFLP) using MboII is a common genotyping method for MTHFR A1298C.
• Concerns exist regarding MboII's reliability due to a nearby silent polymorphism (T1317C).

Purpose of the Study:

• To investigate the concordance between RFLP and sequencing for MTHFR A1298C genotyping.
• To assess the reliability of the MboII enzyme for RFLP analysis of MTHFR A1298C in a Brazilian population.
• To evaluate the impact of the T1317C polymorphism on MTHFR A1298C RFLP genotyping.

Main Methods:

• Genotyping of the MTHFR A1298C polymorphism using RFLP with MboII enzyme.
• Confirmation of genotyping results using automated DNA sequencing.
• Statistical analysis of concordance using the kappa coefficient.

Main Results:

• An 8.6% difference in genotyping results was observed between RFLP and sequencing.
• A kappa coefficient of 0.81 (95% CI 0.74-0.88) indicated virtually perfect concordance between the two methods.
• The RFLP technique demonstrated high agreement with sequencing under the study's laboratory conditions.

Conclusions:

• The RFLP technique using MboII is a concordant method for detecting the MTHFR A1298C polymorphism.
• Automated sequencing validates the reliability of RFLP for MTHFR A1298C genotyping in this population.
• Despite potential limitations, RFLP remains a viable tool for MTHFR A1298C analysis.