Divergent transcriptomic profiles in depressed individuals with hyper- and hypophagia implicating inflammatory status

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Major Depressive Disorder (MDD) is a complex condition with varied symptoms.
• Appetitive phenotypes, like increased (hyperphagic) or decreased (hypophagic) appetite, are key features linked to comorbidities.
• Understanding the biological underpinnings of these MDD subtypes is limited.

Approach:

• Conducted peripheral blood RNA profiling using bulk RNA sequencing in unmedicated individuals with hyperphagic and hypophagic MDD.
• Analyzed gene expression to identify individual genes and pathways associated with appetitive phenotypes.
• Utilized the Maastricht Acute Stress Task to investigate stress-related transcriptomic profiles in both MDD groups.

Key Points:

• Identified specific genes and gene pathways linked to hyperphagic and hypophagic MDD endophenotypes.
• Revealed distinct transcriptomic signatures associated with appetite changes in depression.
• Explored stress-related gene expression differences between hyperphagic and hypophagic MDD.

Conclusions:

• The study provides novel insights into the molecular mechanisms differentiating hyperphagic and hypophagic MDD.
• Findings suggest distinct biological pathways contribute to these appetitive phenotypes in depression.
• This research lays the groundwork for developing targeted treatments for MDD subtypes.