N-acetyltransferase-2 genotypes among Jordanian patients with diabetes mellitus.

BACKGROUND

There are inconsistent reports concerning N-acetyltransferase 2 (NAT2) genotypes in diabetes mellitus (DM).

OBJECTIVE

The objective of the study was to explore any association between NAT2 genotypes and Type 1 and Type 2 DM in Jordanians.

METHODS

106 Type 1 and 110 Type 2 DM patients attending the "National Center for Diabetes, Endocrinology and Genetics", Amman, Jordan, were included in the study. DNA was extracted from venous blood using a commercial DNA extraction kit. NAT2 genotyping was performed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).

RESULTS

The frequency of the genotype that encodes rapid acetylation (the wild-type genotype NAT24/4) was similar in the two types of diabetes mellitus. Those which encode intermediate acetylation (NAT24/5, NAT24/6, and NAT24/7) were higher in Type 2 diabetes (0.482) compared to Type 1 diabetes (0.339), while the frequency of genotypes which encode slow acetylation (NAT25/5, NAT25/6, NAT25/7, NAT26/6, NAT26/7, and NAT27/7) were higher in Type 1 diabetes (0.547) compared to Type 2 diabetes (0.418).

CONCLUSION

There is excess of genotypes encoding intermediate acetylation in Type 2 DM and an excess of slow acetylator genotypes in Type 1 DM. Furthermore, NAT2*4/6 genotype (which encodes intermediate acetylation) was more prevalent in Type 2 DM. Type 1 DM behaved similar to non-diabetic controls in regard to acetylation status.