Potential New Expression Biomarkers for Anorexia Nervosa

Area of Science:

• Genetics
• Neuroscience
• Metabolic Disorders

Background:

• Anorexia nervosa (AN) is a complex psychiatric disorder with high heritability (~70%).
• Genome-wide association studies have identified AN risk loci, but underlying molecular mechanisms require elucidation.

Purpose of the Study:

• To investigate the molecular mechanisms and identify candidate genes contributing to the genetic basis of anorexia nervosa.
• To explore gene expression differences in peripheral blood mononuclear cells from AN patients and controls.
• To validate findings in a mouse model of chronic food restriction.

Main Methods:

• Transcriptome profiling of peripheral blood mononuclear cells from 15 AN patients and 15 healthy controls.
• Validation of gene expression changes in a mouse model mimicking chronic food restriction.
• Analysis of differentially expressed genes, focusing on previously implicated genes and Vanin-1 (Vnn1).

Main Results:

• Identified 673 significantly differentially expressed genes in AN patients.
• Seven genes previously found dysregulated in AN-derived neurons were among the differentially expressed genes.
• Vanin-1 (Vnn1) was underexpressed in AN patients and confirmed to be underexpressed in the liver of the chronic food restriction mouse model.

Conclusions:

• Quantitative food restriction impacts Vnn1 expression, suggesting its contribution to the anorexic phenotype.
• Vnn1 is a potential biomarker for predicting or understanding anorexia nervosa.
• The study highlights candidate genes and pathways for future AN research.