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N-acetyltransferase polymorphism among northern Sudanese
Said Al-Yahyaee1, Uzma Gaffar, Maryam M Al-Ameri
1Department of Biochemistry, College of Medicine and Health Sciences, Sultan Qaboos University, Al Khod, P.O. Box 35, Muscat 123, Sultanate of Oman.
Differences in N-acetyltransferase (NAT2) single nucleotide polymorphisms (SNPs) affect drug metabolism and cancer risk. Northern Sudanese populations show a higher prevalence of slow acetylator NAT2 SNPs, suggesting an African origin for this polymorphism.
Area of Science:
- Pharmacogenomics
- Human Genetics
- Molecular Biology
Background:
- Interindividual and interethnic variations in N-acetyltransferase (NAT2) single nucleotide polymorphisms (SNPs) contribute to diverse drug responses and cancer susceptibility.
- Understanding NAT2 allele frequencies is crucial for personalized medicine and disease risk assessment.
Purpose of the Study:
- To genotype common NAT2 SNPs in a northern Sudanese population.
- To determine the frequency of NAT2 alleles and genotypes in this ethnic group.
- To investigate the utility of combined molecular and computational methods for resolving complex genotypes.
Main Methods:
- Genotyping of seven common NAT2 SNPs in 127 northern Sudanese individuals using allele-specific and RFLP PCR.
- Utilizing HAP and Phase computational programs to infer and confirm haplotypes and resolve ambiguous genotypes.
- Analysis of NAT2 allele and genotype frequencies.
Main Results:
- Twelve NAT2 alleles were identified, with 82% coding for slow acetylators and 18% for rapid acetylators.
- Genotype analysis revealed 68.5% slow, 27.6% intermediate, and 3.9% rapid acetylation phenotypes.
- The G191A (African) and G857A (Asian) SNPs were found at low frequencies (3.1%).
- Combined molecular and computational approaches successfully resolved genotypes in individuals with multiple SNP heterozygotes.
Conclusions:
- Northern Sudanese populations exhibit a higher prevalence of slow acetylator NAT2 SNPs compared to Caucasian and Asian populations.
- The findings support the hypothesis of an African origin for NAT2-associated polymorphisms.
- Integrated genotyping strategies are effective for characterizing complex genetic variations like NAT2 SNPs.
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