Genome-Wide Association Study: Functional Variant rs2076295 Regulates Desmoplakin Expression in Airway Epithelial...

Area of Science:

• Molecular biology and genetics
• Cellular and tissue engineering
• Respiratory medicine

Background:

• Genetic association studies link rs2076295 to idiopathic pulmonary fibrosis (IPF).
• Desmoplakin (DSP) function in airway epithelial cells and its role in IPF pathogenesis are not fully understood.
• Hypothesis: rs2076295 is a functional variant regulating DSP expression and function relevant to IPF.

Purpose of the Study:

• To investigate whether rs2076295 regulates DSP expression in human airway epithelial cells.
• To determine the functional role of DSP in airway epithelial cell migration and extracellular matrix gene expression.

Main Methods:

• CRISPR/Cas9 gene editing (deletion, indel, interference, single-base editing) to modify rs2076295 in 16HBE14o- and primary airway epithelial cells.
• Quantification of DSP and extracellular matrix gene expression using quantitative PCR and single-cell RNA-sequencing.
• Assessment of cellular integrity, migration, and genome-wide gene expression changes in DSP-knockout cells.

Main Results:

• DSP expression is reduced in alveolar epithelial cells of IPF lungs.
• rs2076295 modification (deletion or GG genotype) decreased DSP expression in edited cell lines.
• DSP knockout increased cell migration and extracellular matrix gene expression (MMP7, MMP9), while decreasing transepithelial resistance.

Conclusions:

• rs2076295 acts as a regulatory element for DSP expression in human airway epithelial cells.
• Loss of DSP function enhances cell migration and extracellular matrix gene expression.
• These findings suggest a novel mechanism involving rs2076295 and DSP in the pathogenesis of IPF.