Matrixmetalloproteinase-9 gene polymorphism (rs 17576) increases the risk of depressive symptoms in bipolar disorder

Area of Science:

• Neuroscience
• Genetics
• Psychiatry

Background:

• Neural synapse plasticity is implicated in bipolar disorder (BD) complications.
• Matrix metalloproteinases (MMPs), particularly MMP-9, influence synaptic plasticity and memory.
• Limited research exists on MMP-9 gene polymorphism in BD, despite elevated MMP-9 levels in neuropsychiatric disorders.

Purpose of the Study:

• Investigate the genotype and allele frequencies of the MMP-9 genetic variant (rs 17576) in BD patients.
• Determine the association between MMP-9 gene polymorphism and BD disease severity.

Main Methods:

• Genotyping and allele frequency analysis of MMP-9 (rs 17576) in 80 BD cases and 80 controls.
• Measurement of plasma MMP-9 levels.
• Assessment of BD severity using Hamilton Depression Rating Scale and Young's Mania Rating Scale (YMRS).

Main Results:

• No significant difference in genotype or minor allele (G) frequency between BD patients and controls.
• Significantly increased MMP-9 levels in BD patients with AG and GG genotypes compared to controls.
• The GG genotype and G allele of MMP-9 (rs 17576) were associated with an increased risk of depressive symptoms in BD.
• MMP-9 levels positively correlated with YMRS scores in BD patients.

Conclusions:

• MMP-9 gene polymorphism (rs 17576) is linked to depressive symptoms in bipolar disorder.
• Specific MMP-9 genotypes (AG, GG) are associated with elevated MMP-9 levels and increased risk for depression in BD.