Key Points
- This research investigates the phenomenon of mistyping ACE genotypes, specifically ID as DD, impacting myocardial infarction risk predictions.
- Examined PCR amplification conditions for ACE genotypes.
- Tested the effect of adding 5% dimethylsulfoxide to improve amplification of the I allele.
- Developed a new PCR protocol with an additional sense primer to accurately identify ID heterozygotes.
- Inclusion of 5% DMSO significantly improved the amplification of the I allele in ID heterozygotes.
- ID heterozygotes amplified faithfully with DMSO, reducing mistyping occurrences.
- An additional PCR protocol with new primers resolved mistyping issues during genotype identification.
Structured PICO
PPopulationGenomic DNA from a large pedigree used for genotyping human angiotensin I-converting enzyme (ACE) insertion/deletion (I/D) polymorphism
IInterventionPCR amplification with 5% dimethylsulfoxide (DMSO) or a new sense primer
CComparatorStandard PCR amplification without DMSO
OOutcomeAccurate identification of ACE genotypes (II, DD, ID) without mistyping ID as DD
Adding 5% DMSO to PCR mixtures prevents the mistyping of ACE ID heterozygotes as DD homozygotes, which is critical for accurate risk assessment since the DD genotype is associated with higher myocardial infarction risk.