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Allelic differences in the serotonin transporter-linked polymorphic region in geriatric depression
David C Steffens1, Ingrid Svenson, Douglas A Marchuk
1Department of Psychiatry, Duke University Medical Center, Durham, North Carolina, USA.
Summary
Genetic variations in serotonin transporter-linked polymorphic region (5HTTLPR) may influence depression risk differently in men and women. This study found a link between 5HTTLPR alleles and depression, particularly in men and women with recurrent episodes or family history.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Previous research suggests a link between the serotonin transporter-linked polymorphic region (5HTTLPR) gene and affective disorders.
- The 5HTTLPR gene influences serotonin transporter expression and is implicated in mood regulation.
Purpose of the Study:
- To investigate the association between 5HTTLPR genetic variations and depression in older adults.
- To explore potential gender-specific effects of 5HTTLPR on depression risk and recurrence.
Main Methods:
- Genotyping for the 5HTTLPR polymorphism was performed on 182 older depressed subjects and 107 elderly control subjects.
- Allele frequencies were analyzed, with a focus on gender differences and associations with depression severity and family history.
Main Results:
- No significant overall differences in 5HTTLPR allele frequencies were found between depressed and control groups.
- Among men, a higher prevalence of the short/short genotype was observed in depressed individuals (23%) compared to controls (5%).
- In women, the short allele was more common in those with recurrent depression (67%) and a positive family history of psychiatric illness (74%) compared to single-episode patients (41%) and those without family history (53%).
Conclusions:
- The findings suggest that 5HTTLPR may have gender-specific effects on depression risk.
- The short allele of 5HTTLPR might increase depression risk in men and contribute to recurrence in women.
- Further research with larger sample sizes is warranted to confirm these gender-specific associations.