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The IPF-associated variant in MUC5B, rs35705950, resides within an enhancer that is subject to lineage- and disease-dependent epigenetic remodeling

ABSTRACT: The IPF-associated variant in MUC5B, rs35705950, resides within an enhancer that is subject to lineage- and disease-dependent epigenetic remodeling

PROVIDER: PRJNA679078 | ENA |

REPOSITORIES: ENA

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The IPF-associated variant in MUC5B, rs35705950, resides within an enhancer that is subject to lineage- and disease-dependent epigenetic remodeling

Project description:Genetic polymorphisms account for over 30% of the risk for sporadic pulmonary fibrosis. Yet it remains unknown how the minor variant of rs35705950, the strongest driver of IPF genetic risk, mediates molecular changes to influence IPF development. In the parent publication we use chromatin immunoprecipitation, nuclease sensitivity, nascent transcript analysis, bulk RNA- and ATAC-seq from established cell lines, and finally, paired single-nucleus RNA- and ATAC-seq from IPF patients and controls to demonstrate that the variant rs35705950 resides within a classically defined enhancer of the MUC5B locus.

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Project description:The G/T transversion, rs35705950, located approximately 3 kb upstream of the MUC5B start site, is the cardinal risk factor for IPF. Here, we investigate the function and chromatin structure of this -3 kb region and provide evidence that it functions as a classically defined enhancer subject to epigenetic programming. We use nascent transcript analysis to show that RNA polymerase II loads within 10 bp of the G/T transversion site, definitively establishing enhancer function for the region. By integrating ATAC-seq analysis of fresh and cultured human airway epithelial cells with nuclease sensitivity data, we demonstrate that this region is in accessible chromatin that affects the expression of MUC5B. Through applying paired single nucleus RNA- and ATAC-seq to frozen tissue from IPF lungs, we extend these findings directly to disease, with results indicating that epigenetic programming of the -3 kb enhancer in IPF occurs in both MUC5B-expressing and non-expressing lineages. In aggregate, our results indicate that the MUC5B-associated variant, rs35705950, resides within an enhancer that is subject to epigenetic remodeling and contributes to pathologic misexpression in IPF.

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