A latent class analysis of parental bipolar disorder: Examining associations with offspring psychopathology

Area of Science:

• Psychiatry
• Genetics
• Developmental Psychology

Background:

• Bipolar disorder (BD) is a heterogeneous condition with varied clinical courses impacting patient outcomes and offspring risk.
• Identifying specific BD subtypes is crucial for targeted interventions and understanding familial transmission patterns.

Purpose of the Study:

• To categorize parents with bipolar disorder into distinct subtypes using latent class analysis (LCA).
• To investigate the association between parental BD subtypes and the risk of developing disorders in their offspring.

Main Methods:

• Latent class analysis (LCA) was employed to classify parents with BD based on illness characteristics: BD type, onset age, episode polarity, rapid cycling, psychosis, anxiety, and substance dependence.
• Offspring (ages 4-33) of these parents were assessed for the presence of various disorders.

Main Results:

• Three distinct parental BD classes emerged: Earlier-Onset Bipolar-I (EO-I), Earlier-Onset Bipolar-II (EO-II), and Later-Onset BD (LO).
• Offspring of EO-I and EO-II parents exhibited significantly higher rates of anxiety disorders compared to offspring of LO parents.
• This increased risk for anxiety disorders in offspring was particularly pronounced in daughters.

Conclusions:

• Parental BD classification into distinct subtypes provides valuable insights into heterogeneous illness trajectories.
• The identified parental BD subtypes are associated with differential risks for anxiety disorders in offspring, highlighting the importance of early-onset parental BD as a risk factor.