Temperament and Character Inventory in Bipolar Disorder versus Healthy Controls and Modulatory Effects of 3 Key...

Area of Science:

• Neuroscience
• Psychiatry
• Behavioral Genetics

Background:

• Bipolar disorder (BD) is linked to personality traits, but the genetic underpinnings require further clarification.
• Candidate genes like COMT, BDNF, and 5-HTT are implicated in temperament and character.
• Understanding these genetic associations can offer insights into BD pathophysiology.

Purpose of the Study:

• To investigate the relationship between specific gene variants (COMT rs4680, BDNF rs6265, 5-HTTLPR) and temperament/personality traits in bipolar disorder patients and healthy controls.
• To explore potential gene-environment interactions influencing these traits.

Main Methods:

• The GECO-BIP study included 125 BD patients and 173 healthy controls (HC).
• Participants completed the Temperament and Character Inventory (TCI).
• Genotyping was performed for COMT rs4680, BDNF rs6265, and 5-HTTLPR, followed by statistical analyses.

Main Results:

• BD patients exhibited distinct TCI profiles, with higher novelty seeking, harm avoidance, and self-transcendence, and lower self-directness and cooperativeness compared to HC.
• COMT rs4680 was associated with novelty seeking in the general population and males, particularly in HC, but not in BD patients.
• BDNF rs6265 showed an association with self-transcendence specifically within the BD patient group.

Conclusions:

• The COMT rs4680 variant may influence novelty seeking in males, an effect potentially masked or altered by bipolar disorder.
• BDNF rs6265 appears to modulate self-transcendence in BD patients, possibly linking to treatment response.
• Further research is warranted to validate these genetic associations and their clinical implications.