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Iridology is the study of the iris of the eye to detect the conditions of the body and its organs, genetic strengths and weaknesses, etc. Although iridology is not widely used as a scientific tool for healthcare professionals to get to the source of people's health conditions, it has been used as a supplementary source to help the diagnosis of medical conditions by noting irregularities of the pigmentation in the iris among some Korean Oriental medical doctors. Angiotensin converting enzyme (ACE) gene polymorphism is one of the most well studied genetic markers of vascular disease. We investigated the relationship between iridological constitution and ACE polymorphism in hypertensives. We classified 87 hypertensives and 79 controls according to iris constitution and determined the ACE genotype of each individual. DD genotype was more prevalent in patients with a neurogenic constitution than in controls. This finding supports the hypothesis that D allele is a candidate gene for hypertension and demonstrates the association among ACE genotype, Korean hypertensives and iris constitution.

During the last decade, a growing corpus of evidence has indicated an important role of cytokines in the development of brain damage following cerebral ischemia. Tumor necrosis factor-α (TNF-α), a potent immunomodulator and pro-inflammatory cytokine, has been implicated in many pathological processes. In this study, we examined whether promoter region polymorphism in the TNF-α gene at position –308 affects the odds of cerebral infarction (CI) and whether genetic risk is enhanced by Sasang constitutional classification. Two hundred and twelve CI patients and 610 healthy controls were genotyped and determined according to Sasang constitutional classification. A significant decrease was found for the TNF-α A allele in CI patients compared with controls (p = 0.033, odds ratio, OR: 0.622). However, there was no significant association between TNF-α polymorphism and Sasang constitution in CI patients. Our finding suggests that TNF-α promoter region polymorphism is responsible for susceptibility to CI in Koreans.

Iridology is a complementary and alternative medicine that involves the diagnosis of medical conditions by noting irregularities of the pigmentation in the iris. Iris constitution has a strong hereditary component. Tumor necrosis factor-alpha (TNFα), a pleiotropic cytokine, has been implicated in many pathological processes including hypertension. In this paper, the relationship between iris constitution and TNFα gene polymorphism in those with hypertension is investigated. Eighty seven hypertensive individuals and 79 controls were classified according to iris constitution and the TNFα genotype of each individual determined. Compared to the controls, the frequency of the TNFα GA heterozygote was lower in the hypertensive group, although the statistical significance was marginal (p = 0.08). This result implies an association with resistance to the disease. In addition, the frequency of the cardio-renal connective tissue weakness type was significantly higher in the hypertensive group with the TNFα GG genotype, as compared to the controls (p = 0.001). An association is demonstrated among TNFα gene polymorphism, Koreans with hypertension, and iris constitution.

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