title: Homocysteine levels, MTHFR C677T genotype, and MRI Hyperintensities in late-onset major depressive disorder.
abstract: OBJECTIVE
  Epidemiological studies suggest that elevated plasma homocysteine is associated with an increased risk of depression and cerebrovascular disease. There are no published reports of homocysteine levels and methylenetetrahydrofolate reductase (MTHFR) C677T genotype in clinical samples of patients with late-onset major depressive disorder (MDD). The purpose of this study was to examine the association of homocysteine levels or MTHFR C677T genotype and late-onset MDD and assess whether this may be affected by brain magnetic resonance imaging (MRI) hyperintensities.
  
  
  METHODS
  Authors recruited 39 elderly patients with MDD with first episode occurring after age 50 and 20 comparison subjects and assessed total plasma homocysteine levels, MTHFR genotype, and brain MRIs.
  
  
  RESULTS
  Plasma total homocysteine levels were higher in elderly patients with late-onset MDD versus comparison subjects. The association did not change after controlling for MRI hyperintensities, and the distribution of MTHFR C677T genotype was not different between the groups.
  
  
  CONCLUSIONS
  In this exploratory study, elevated homocysteine levels were associated with late-onset MDD, and the association did not appear to be mediated by vascular pathology as identified by brain MRI hyperintensities.
authors.affiliation: Dept. of Psychiatry, Kaohsiung Medical University, Chung-Ho Memorial Hospital, No. 100, Tzyou 1 Rd, Kaohsiung City, Taiwan 807. sheng@cc.kmu.edu.tw
authors.forename: Cheng-Sheng
authors.initials: CS
authors.lastname: Chen
authors.forename: Jer-Chia
authors.initials: JC
authors.lastname: Tsai
authors.forename: Hin-Yeung
authors.initials: HY
authors.lastname: Tsang
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Kuo
authors.forename: Hsiu-Fen
authors.initials: HF
authors.lastname: Lin
authors.forename: I-Chan
authors.initials: IC
authors.lastname: Chiang
authors.forename: D P
authors.initials: DP
authors.lastname: Devanand
mesh_terms: D017668:Age of Onset; D000368:Aged; D001921:Brain / Q000473:pathology*; D017931:DNA Primers / Q000235:genetics; D003865:Major Depressive Disorder / Q000097:blood* / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D015870:Gene Expression / Q000235:genetics*; D005838:Genotype; D006710:Homocysteine / Q000097:blood*; D006801:Humans; D007962:Leukocytes / Q000378:metabolism; D008279:Magnetic Resonance Imaging; D008297:Male; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008875:Middle Aged; D016133:Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D006710:Homocysteine; D042965:Methylenetetrahydrofolate Reductase (NADPH2)