Uncontrolled diabetes mellitus may affect any part of the gastrointestinal tract (GIT) and impact negatively the quality of life. Angiotensin-converting enzyme (ACE) gene polymorphism can have direct effect on circulating level of ACE which further modifies the degradation of substance P and thus may influence the gut motility. Hence, it could be hypothesised that ACE gene polymorphism would influence the gut motility. An observational analytical study was conducted at PGIMER, Chandigarh. 300 Type2 diabetes mellitus (T2DM) and 200 age and sex matched healthy individuals were enrolled. After taking written consent, 5 ml blood sample was collected for measurement of substance P by ELISA method and for ACE gene polymorphism (insertion[I]/deletion[D]) by polymerase chain reaction. Orocecal transit time (OCTT) was measured using non-invasive lactulose breath test. Out of 300 diabetic patients, 32.7%, 44% and 23.3% belonged to II, ID and DD genotypes, respectively. The frequency of D allele (OR = 1.39) and DD genotype (OR = 2.17) was significantly higher in patients than in controls and was associated with increased risk. Moreover, more number of diabetes patients with constipation (90%) belonged to DD genotype and their OCTT was significantly delayed (166.7 ± 7.3 min) as compared to ID (143.5 ± 4.2 min) or II (121.8 ± 4.9 min) genotype. From this study, it could be concluded that ACE gene polymorphism could be an important contributing factor to influence the gut motility and thus giving rise to the GI symptoms for T2DM patients.
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