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Background: Neuroimaging detects cerebral small vessel disease (CSVD) subtypes, including infarction, asymptomatic lacunes, cerebral microbleeds, white matter hyperintensities (WMHs), and enlarged perivascular space. Methylenetetrahydrofolate reductase (MTHFR) plays an essential role in the metabolism of folic acid and homocysteine. The purpose of this study was to investigate the relationship between the MTHFR C677T mutation and CSVD subtypes.Methods: A total of 144 patients with acute ischemic stroke who visited the Korea University Guro Hospital between April 2020 and August 2020 were retrospectively reviewed. After excluding 24 patients, due to missing laboratory, clinical, or imaging information, a total of 120 patients were analyzed.Results: Among the 120 participants, 25% were included in the MTHFR C677T homozygous mutation group, which had significantly lower folic acid levels (6.24±4.21 ng/mL vs. 8.24±4.21 ng/mL, p=0.03) and higher total homocysteine levels (17.09±14.07 μmol/L vs. 9.65±3.19 μmol/L, p&lt;0.01). Using multiple logistic regression analysis, the homozygous mutation (adjusted odds ratio [aOR]=4.29; 95% confidence interval [CI]=1.16–15.90) and age (aOR=1.06; 95% CI=1.01–1.11) were independently associated with moderate to severe WMHs. Additionally, moderate to severe WMHs were more frequent in the homozygous mutation group (86.7% vs. 66.7%, p=0.01). In a detailed analysis, the homozygous mutation group showed a significantly higher rate of moderate to severe periventricular WMH (PWMH) (86.7% vs. 65.6%, p&lt;0.01).Conclusion: The MTHFR C677T homozygous mutation was positively correlated with moderate to severe PWMH subtypes of CSVD.

Relationship between Methylenetetrahydrofolate Reductase C677T Homozygous Mutation and Cerebral Small Vessel Disease Subtypes