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Learn MoreWe have examined the role of the replication stress protein Etaa1 in mouse effector T cell expansion. While immune development and other steady state phenotypes are relatively normal in Etaa1 deficient mice, these mice have a selective defect in T cell expansion after vaccination or viral infection. To better determine the cause of this defect, we conducted RNA-seq analysis on Etaa1 wild-type or splice mutant LCMV-specific P14 CD8+ T cells at day 5 p.i. with LCMV-Armstrong. We find that mutant cells exhibit a strong enrichment of a p53 DNA damage signature within their transcriptome, and we independently validated this change by demonstrating increased staining for the DNA damage response factor gamma-H2AX within mutant T cells. Collectively these data suggest that Etaa1 plays a surprisingly specific role in preventing DNA damage accumulation within proliferating effector T cells. SOURCE: Ian Parish (ian.parish@anu.edu.au) - ANU
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