The -308 (G/A) single nucleotide polymorphism in the TNF-α gene and the risk of major depression in the elderly

Anna Paola Cerri, Beatrice Arosio, Chiara Viazzoli, Roberto Confalonieri, Carlo Vergani, Giorgio Annoni

Research output: Contribution to journalArticle

Abstract

Objective: The immune system (IS) plays a key role in the mechanisms underlying major depression (MD) and pro-inflammatory cytokines seem to be particularly involved in the pathogenesis of the disease. There is growing evidence of a relationship between commonly studied single nucleotide polymorphisms (SNPs) in cytokine genes and an increased risk of MD. The aim of our study was to investigate the association between the -308(G/A) SNP in the tumour necrosis factor-α (TNF-α) gene and late-life MD in elderly people without dementia. Methods: Blood samples were obtained from 50 subjects enrolled at the Geriatric Department of the San Gerardo Hospital in Monza, Italy, after screening with the geriatric depression scale (GDS≥15) and mini-mental state evaluation (MMSE≥24). The -308 (G/A) SNP was genotyped by SSP-PCR amplification. Two hundred and forty age-matched healthy volunteers were taken as the control group. Results: Genotype and allele distributions in patients with MD were significantly different from those of the controls. In subjects affected by MD we found a higher percentage of the GG genotype (84 vs. 68,3%; p = 0.007) and thus of the G allele (92 vs. 81,9%; p = 0.05). The GG genotype was associated with a greater risk of developing the disease (OR 2.433, CI 1.09-5.43). Conclusions: Our study suggests that the -308 (G/A) polymorphism in the TNF-α gene could play a role in determining susceptibility to MD. An activation of the TNF-α system could contribute to the development of MD in the elderly.

Original languageEnglish
Pages (from-to)219-223
Number of pages5
JournalInternational Journal of Geriatric Psychiatry
Volume25
Issue number3
DOIs
Publication statusPublished - Mar 2010

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Keywords

  • Gene polymorphisms
  • Inflammation
  • Major depression
  • TNF-α

ASJC Scopus subject areas

  • Geriatrics and Gerontology
  • Psychiatry and Mental health

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