A rare missense variant in RCL1 segregates with depression in extended families

Area of Science:

• Genetics
• Neuroscience
• Psychiatry

Background:

• Depression is a common psychiatric disorder with a complex, heritable etiology.
• Identifying genetic risk factors for depression has been challenging due to its complex nature.

Purpose of the Study:

• To investigate the role of rare exonic variants in depressive symptoms using a family-based genetic isolate.
• To identify novel candidate genes contributing to the genetic burden of depression.

Main Methods:

• Utilized linkage and haplotype analyses in the Erasmus Rucphen Family (ERF) study.
• Performed exome sequencing to identify genetic variants.
• Validated findings in the independent Rotterdam study.

Main Results:

• Identified a rare missense mutation (rs115482041) in the RCL1 gene segregating with depression across generations in the ERF study.
• The RCL1 mutation showed significant association with depressive symptoms in both ERF and Rotterdam study cohorts.
• RCL1 expression co-localizes with a specific astrocyte subclass in primate brains.

Conclusions:

• RCL1 is identified as a novel candidate gene for depression.
• The study provides insights into potential biological mechanisms involving RCL1 in depression.
• Rare variants in genes like RCL1 may contribute significantly to the heritability of depression.