Personality traits in bipolar disorder type I: a sib-pair analysis

Area of Science:

• Psychiatry
• Behavioral Genetics

Background:

• Bipolar disorder (BD) has a significant genetic component.
• Understanding personality traits associated with genetic vulnerability is crucial for early identification and intervention.

Purpose of the Study:

• To compare temperament and character traits in bipolar disorder (BD) patients, their siblings, and healthy controls (HCs).
• To investigate if specific personality traits are linked to the genetic predisposition for developing BD.

Main Methods:

• The study utilized the Temperament and Character Inventory (TCI).
• A total of 204 participants were assessed: 67 euthymic BD type I outpatients, 67 siblings without BD, and 70 HCs.

Main Results:

• Patients with BD exhibited higher scores in harm avoidance, novelty seeking, and self-transcendence, and lower scores in self-directedness and cooperativeness compared to HCs.
• Siblings of BD patients showed elevated harm avoidance and reduced self-directedness compared to HCs.
• Even siblings without any lifetime psychiatric disorders displayed higher harm avoidance scores than HCs.

Conclusions:

• The harm avoidance temperament trait appears to be a significant vulnerability factor for BD.
• The self-directedness character trait may also contribute to BD vulnerability, though to a lesser extent.