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Background  The methylenetetrahydrofolate reductase (MTHFR) enzyme catalyzes the reduction of 5, 10-methylenetetrahydrofolate to 5-methyltetrahydrofolate and methyl donors. The methyl donors are required for the conversion of homocysteine to methionine. Mutation of MTHFR 677 C > T disrupts its thermostability therefore leads to defective enzyme activities and dysregulation of homocysteine levels.    Methods  This case-control study (n = 367) was conducted to investigate the correlation of the MTHFR gene polymorphism [NM_005957] and psoriasis vulgaris amongst the Malaysian population. Overnight fasting blood samples were collected from a subgroup of consented psoriasis vulgaris patients and matched controls (n = 84) for the quantification of homocysteine, vitamin B 12  and folic acid levels.    Results  There was no significant increase of the MTHFR 677 C > T mutation in patients with psoriasis vulgaris compared with controls ( χ  2  = 0.733, p = 0.392). No significant association between homocysteine levels and MTHFR gene polymorphism in cases and controls were observed (F = 0.91, df = 3, 80, p = 0.44). However, homocysteine levels in cases were negatively correlated with vitamin B 12  (r = -0.173) and folic acid (r = -0.345) levels. Vitamin B 12  and folic acid levels in cases were also negatively correlated (r = -0.164).    Conclusions  Our results indicate that there was no significant association between the MTHFR gene polymorphism and psoriasis vulgaris in the Malaysian population. There was no significant increase of the plasma homocysteine level in the psoriasis patients compared to the controls.

nutrition journal

Association of Methylentetraydrofolate Reductase (MTHFR) 677 C &gt; T gene polymorphism and homocysteine levels in psoriasis vulgaris patients from Malaysia: a case-control study