Profiling brain expression of the spermidine/spermine N1- acetyltransferase 1 (SAT1) gene in suicide

Timothy A. Klempan, Dan Rujescu, Chantal Mérette, Carla Himmelman, Adolfo Sequeira, Lilian Canetti, Laura M. Fiori, Barbara Schneider, Alexandre Bureau, Gustavo Turecki

Research output: Contribution to journalArticlepeer-review

Abstract

Altered stress reactivity is considered to be a risk factor for both major depressive disorder and suicidal behavior. The authors have sought to expand their previous findings implicating altered expression of spermidine/spermine N1-acetyltransferase 1 (SAT1), the rate-limiting enzyme involved in catabolism of the polyamines spermidine and spermine in the polyamine stress response (PSR), across multiple brain regions between control individuals and depressed individuals who have died by suicide. Microarray expression of probesets annotated to SAT1 were examined across 17 brain regions in 13 controls and 26 individuals who have died by suicide (16 with a diagnosis of major depression and 10 without), all of French-Canadian origin. Profiling conducted on the Affymetrix U133A/B chipset was further examined on a second chipset (U133 Plus 2.0) using RT-PCR, and analyzed in a second, independent sample. A reduction in SAT1 expression identified through multiple probesets was observed across 12 cortical regions in depressed individuals who have died by suicide compared with controls. Of these, five cortical regions showed statistically significant reductionswhich were supported by RT-PCR and analysis on the additional chipset. SAT1 cortical expression levels were also found to be significantly lower in an independent sample of German subjects with major depression who died by suicide in comparison with controls. These findings suggest that downregulation of SAT1 expression may play a role in depression and suicidality, possibly by impeding the normal PSR program or through compensation for the increased polyamine metabolism accompanying the psychological distress associated with depressive disorders.

Original languageEnglish (US)
Pages (from-to)934-943
Number of pages10
JournalAmerican Journal of Medical Genetics, Part B: Neuropsychiatric Genetics
Volume150
Issue number7
DOIs
StatePublished - Oct 5 2009

Keywords

  • Depression
  • Microarray
  • Polyamine
  • Spermidine/spermine N-acetyltransferase
  • Suicide

ASJC Scopus subject areas

  • Genetics(clinical)
  • Psychiatry and Mental health
  • Cellular and Molecular Neuroscience

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