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ABSTRACT: ETA samples from the IBIS cohort

PROVIDER: PRJNA1020542 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26182500.fastq.gz	Fastqsanger.gz
	SRR26182600.fastq.gz	Fastqsanger.gz
	SRR26182700.fastq.gz	Fastqsanger.gz
	SRR26182501.fastq.gz	Fastqsanger.gz
	SRR26182601.fastq.gz	Fastqsanger.gz

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DNA polymerase η contributes to lagging strand synthesis

Project description:DNA polymerase eta (pol eta) is best known for its ability to bypass UV-induced thymine-thymine (T-T) dimers and other bulky DNA lesions, but pol eta also has other cellular roles. Here, we present evidence that pol eta competes with DNA polymerases alpha and delta for the synthesis of the lagging strand genome-wide, where it also shows a preference for T-T in the DNA template. Moreover, we found that the C-terminus of pol eta which contains a PCNA-Interacting Protein motif is required for pol eta to function in lagging strand synthesis. Finally, we provide evidence that a pol η dependent signature is also found to be lagging strand specific in patients with skin cancer. Taken together, these findings provide insight into the physiological role of DNA synthesis by pol eta and have implications for our understanding of how our genome is replicated to avoid mutagenesis, genome instability and cancer.

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Project description:Introduction: We previously reported a specific defect of rheumatoid arthritis (RA) monocyte polarization to anti-inflammatory M2-like macrophages related to increased miR-155 expression in all RA patients except those receiving adalimumab (ADA). In this longitudinal study, we examined whether different tumor necrosis factor inhibitors were able to restore monocyte polarization to M2-like macrophages and their effect on the transcriptomic signature. Methods: M2-like polarization induced by human serum AB was studied in 7 healthy donors and 20 RA patients included in the ABIRA cohort before and 3 months after starting ADA or etanercept (ETA). The differential gene expression of M2- and M1-related transcripts was studied in macrophage-derived monocytes after differentiation. Results: At baseline, RA monocytes showed a defect of polarization to M2-like macrophages as compared with healthy donor monocytes, which was negatively correlated with disease activity. M2-like polarization from circulating monocytes was restored only with ADA and not ETA treatment. The transcriptomic signature demonstrated downregulation of M2-related transcripts and upregulation of M1-related transcripts in active RA. In patients receiving ADA, the transcriptomic signature of M2- related transcripts was restored. Conclusion: This longitudinal study demonstrates that ADA but not ETA is able to restore the M2-like polarization of monocytes that is defective in RA

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