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O O Pavlyushchik, V Yu Afonin, V N Sarokina

    Tsitologiia I Genetika
    |November 28, 2018
    PubMed
    Summary
    This summary is machine-generated.

    The angiotensin-converting enzyme (ACE) I/D polymorphism is linked to DNA damage, particularly micronuclei formation, in essential hypertension patients. The ACE II genotype showed increased DNA damage in normotensive individuals, while the DD genotype showed increased damage in hypertensive patients after incubation.

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    Area of Science:

    • Genetics and Molecular Biology
    • Cardiovascular Disease Research
    • Cellular and Molecular Pathology

    Background:

    • Essential hypertension (EH) is a complex cardiovascular condition.
    • The angiotensin-converting enzyme (ACE) I/D polymorphism (rs4340) is a known genetic factor associated with hypertension.
    • DNA damage and cell cycle alterations are implicated in the pathogenesis of cardiovascular diseases.

    Purpose of the Study:

    • To investigate the association between the ACE I/D polymorphism and DNA damage in patients with essential hypertension.
    • To evaluate the impact of ACE I/D genotypes on cell death, micronuclei formation, and cell cycle progression.
    • To determine how in vitro incubation affects DNA damage susceptibility across different ACE genotypes in hypertensive and normotensive individuals.

    Main Methods:

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    • Polymerase chain reaction (PCR) was used to determine ACE I/D genotypes in 170 male hypertensive patients and 64 normotensive controls.
    • Flow cytometry was employed to assess cell death, micronuclei levels, and leukocyte cell cycle distribution (G1/G0, S, G2/M phases).
    • Whole blood samples were incubated in vitro at 4°C for 24 hours to evaluate genotype-specific susceptibility to DNA damage.

    Main Results:

    • Hypertensive individuals exhibited lower frequencies of cells in the DNA synthesis S phase and higher micronuclei levels compared to normotensive controls (p<0.05).
    • The ACE II genotype was associated with increased micronuclei formation in normotensive individuals and heightened cell death and micronuclei formation upon incubation.
    • Hypertensive patients with the ACE DD genotype showed significantly increased micronuclei formation after in vitro incubation, indicating differential genotypic responses to DNA damage.

    Conclusions:

    • The ACE I/D polymorphism may play a role in the mechanisms and severity of DNA damage in both hypertensive and normotensive individuals.
    • Genotype-specific differences in DNA damage susceptibility and cellular responses are evident, particularly under stress conditions like in vitro incubation.
    • These findings suggest that ACE I/D polymorphism could be a contributing factor to the pathophysiology of essential hypertension through its influence on DNA integrity.