Reduced expression of fatty acid biosynthesis genes in the prefrontal cortex of patients with major depressive disorder
Abstract
BACKGROUND: Major depressive disorder (MDD) is associated with central and peripheral deficits in long-chain polyunsaturated fatty acids (LC-PUFA), particularly those in the omega-3 fatty acid family. However, the etiology of these deficits remains poorly understood, and there is currently little known about the expression of genes that mediate fatty acid biosynthesis in MDD patients.
METHODS: The expression of FADS1 (Δ5 desaturase), FADS2 (Δ6 desaturase), HELO1 [ELOVL5] (elongase), PEX19 (peroxisome), and SCD (stearoyl-CoA desaturase [Δ9 desaturase]) was determined in the postmortem prefrontal cortex of MDD patients (n=10) and non-psychiatric controls (n=10) by real-time reverse transcriptase polymerase chain reaction (RT-PCR).
RESULTS: After correcting for multiple comparisons, FADS1 mRNA expression was significantly lower in MDD patients relative to controls (-27%, p=0.009), and there were trends for lower expression of FADS2 (-30%, p=0.07), HELO1 (-37%, p=0.02), and SCD (-43%, p=0.02). PEX19 mRNA expression did not differ between controls and MDD patients (-2%, p=0.92). There were no significant gender effects, and relative reductions in FADS1, HELO1, and SCD expression were greater in patients that did not commit suicide compared with patients that did commit suicide.
LIMITATIONS: The sample size was small, and all MDD patients were receiving antidepressant medications.
CONCLUSIONS: Principal genes involved in LC-PUFA and monounsaturated fatty acid biosynthesis are…
How strong is the evidence?
Evidence Hub reads this as a case-control, done in people. Its evidence level is 4 of 5 (Low · observational). Observational designs can show an association but not prove cause. Reported size: 10 participants or records.
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