ACE polymorphism in alcohol induced dilated cardiomyopathy
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ACE gene polymorphism alcohol induced dilated cardiomyopathy meta-analysis
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ACE polymorphism AND alcoholic cardiomyopathy
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ACE polymorphism AND cardiomyopathy
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"ACE I/D" "alcoholic cardiomyopathy"
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https://pmc.ncbi.nlm.nih.gov/articles/PMC11231944/
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Fernandez-Sola ACE polymorphism alcohol cardiomyopathy
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PMID: 39510045
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PMID: 12204015
ACE gene polymorphism in alcohol-induced dilated cardiomyopathy
The relevant variant is the ACE insertion/deletion (I/D) polymorphism in intron 16 of the ACE gene:
- I allele: insertion of a 287-base-pair Alu sequence
- D allele: deletion of that sequence
- Genotypes: II, ID, DD
The D allele, especially the DD genotype, is associated with higher circulating and tissue ACE activity. This can increase angiotensin II generation, with adverse remodeling effects including vasoconstriction, oxidative stress, myocyte injury, hypertrophy, and myocardial fibrosis.
Association with alcoholic cardiomyopathy
Alcohol-induced cardiomyopathy is a dilated cardiomyopathy caused by sustained heavy alcohol exposure, but only a minority of heavy drinkers develop overt LV dysfunction. This supports a gene-environment susceptibility model.
A small case-control study of 57 alcoholic men compared 30 with symptomatic cardiomyopathy against 27 alcohol-dependent men with preserved cardiac function:
| Finding | Alcoholic DCM | Alcoholics with normal cardiac function |
|---|---|---|
| ACE DD genotype | 57% | 7% |
The reported odds ratio for LV dysfunction in people with the DD genotype, compared with those carrying an I allele, was 16.4. Thus, the DD genotype was proposed as a marker of increased susceptibility to alcohol-related myocardial damage. See the original Fernández-Solà study.
Proposed mechanism
Heavy alcohol use and acetaldehyde exposure cause mitochondrial dysfunction, oxidative stress, apoptosis, impaired contractility, and altered calcium handling. Increased renin-angiotensin system activity in ACE-DD carriers may amplify these effects:
Alcohol/acetaldehyde toxicity
→ ROS generation and mitochondrial injury
→ activation of renin-angiotensin system
→ higher ACE activity in DD genotype
→ increased angiotensin II
→ fibrosis, apoptosis, ventricular remodeling
→ LV dilatation and systolic dysfunction.
→ ROS generation and mitochondrial injury
→ activation of renin-angiotensin system
→ higher ACE activity in DD genotype
→ increased angiotensin II
→ fibrosis, apoptosis, ventricular remodeling
→ LV dilatation and systolic dysfunction.
Braunwald notes that alcohol-associated myocardial injury is influenced by both phenotypic and genotypic variation, alongside alcohol dose and duration. It describes a typical exposure threshold of roughly >90 g/day for at least 5 years, while recognizing marked variation in individual susceptibility. Braunwald’s Heart Disease, p. 917.
Clinical interpretation
- The ACE-DD association is biologically plausible, but the key study was small, male-only, and observational. It does not establish that DD genotype alone causes alcoholic DCM.
- ACE I/D testing is not recommended for routine clinical screening or diagnosis of alcohol-induced cardiomyopathy.
- Current thinking favors a broader “double-hit” model: alcohol toxicity plus inherited susceptibility, including pathogenic variants in dilated-cardiomyopathy genes such as TTN truncating variants. A recent review of alcoholic cardiomyopathy discusses this genetic contribution.
- Management should not differ according to ACE genotype: complete alcohol abstinence and guideline-directed treatment of HFrEF are central. Recovery of LV function after abstinence is a major prognostic factor.
A 2025 meta-analysis found a modest association between ACE I/D variation and dilated cardiomyopathy generally (OR 1.25, 95% CI 1.03-1.50), but this does not specifically validate the large risk estimate for alcohol-induced DCM. Meta-analysis abstract.
Exam-style takeaway:
ACE DD genotype may predispose chronic alcohol users to alcohol-induced dilated cardiomyopathy by increasing ACE/angiotensin II activity and adverse myocardial remodeling. Evidence is based primarily on a small case-control study, so it is a susceptibility modifier rather than a diagnostic or routinely testable clinical marker.
ACE DD genotype may predispose chronic alcohol users to alcohol-induced dilated cardiomyopathy by increasing ACE/angiotensin II activity and adverse myocardial remodeling. Evidence is based primarily on a small case-control study, so it is a susceptibility modifier rather than a diagnostic or routinely testable clinical marker.
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