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Human Genetics

Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Updated: Apr 24, 2026

Rapid Fractionation and Isolation of Whole Blood Components in Samples Obtained from a Community-based Setting

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Causal Associations Between Immune Cell-Specific Gene Expression and Major Depressive Disorder: A Single-Cell

Xin Mo¹, Dongren Sun², Fangfang Li³

¹Department of Neurosurgery, The Second People's Hospital of Hunan Provincial (Hunan Provincial Brain Hospital), Changsha, China.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology

|April 22, 2026

Summary

Major depressive disorder (MDD) involves immune dysregulation. This study links immune cell gene expression to MDD using genetic data, identifying PTCH1 and MTHFD1L as potential therapeutic targets for precision immunotherapy.

Keywords:

MDD Mendelian randomization drug repositioning immunology single‐cell analysis

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Last Updated: Apr 24, 2026

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Published on: November 30, 2015

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Published on: June 13, 2011

Area of Science:

Immunology
Psychiatry
Genetics

Background:

Major depressive disorder (MDD) is a common psychiatric condition linked to immune system dysfunction.
Understanding the genetic basis of immune cell involvement in MDD is crucial for developing targeted therapies.

Purpose of the Study:

To investigate the causal relationship between gene expression in specific immune cell types and MDD.
To identify novel molecular targets for precision immunotherapy in MDD.

Main Methods:

Integrated single-cell cis-eQTL data with MDD GWAS summary statistics.
Employed single-cell transcriptome-wide Mendelian randomization (scTWMR) and Bayesian colocalization.
Conducted functional analyses including enrichment, protein-protein interaction, and druggability assessment.

Main Results:

Identified six significant gene-cell associations in CD4+ T cells, immature B cells, and plasma cells.
Found strong colocalization evidence for PTCH1, MTHFD1L, and RP11-293M10.2.
Enrichment analyses implicated Hedgehog signaling and folate metabolism pathways.

Conclusions:

Established a genetically predicted causal link between immune cell-specific gene expression and MDD.
PTCH1 and MTHFD1L are validated as potential drug targets for MDD.
The study provides a framework for discovering and validating gene targets for precision immunotherapy.