UPF3A is dispensable for nonsense-mediated mRNA decay in mouse pluripotent and somatic cells.

Chengyan Chen, Yanmin Shen, Luqian Li, Yaoxin Ren, Zhao-Qi Wang, Tangliang Li

Life science alliance 2023 Jun

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Nonsense-mediated mRNA decay (NMD) is a highly conserved regulatory mechanism of post-transcriptional gene expression in eukaryotic cells. NMD plays essential roles in mRNA quality and quantity control and thus safeguards multiple biological processes including embryonic stem cell differentiation and organogenesis. UPF3A and UPF3B in vertebrate species, originated from a single UPF3 gene in yeast, are key factors in the NMD machinery. Although UPF3B is a well-recognized weak NMD-promoting factor, whether UPF3A functions in promoting or suppressing NMD is under debate. In this study, we generated a Upf3a conditional knockout mouse strain and established multiple lines of embryonic stem cells and somatic cells without UPF3A. Through extensive analysis on the expressions of 33 NMD targets, we found UPF3A neither represses NMD in mouse embryonic stem cells, somatic cells, nor in major organs including the liver, spleen, and thymus. Our study reinforces that UPF3A is dispensable for NMD when UPF3B is present. Furthermore, UPF3A may weakly and selectively promote NMD in certain murine organs. © 2023 Chen et al.

Citation

Chengyan Chen, Yanmin Shen, Luqian Li, Yaoxin Ren, Zhao-Qi Wang, Tangliang Li. UPF3A is dispensable for nonsense-mediated mRNA decay in mouse pluripotent and somatic cells. Life science alliance. 2023 Jun;6(6)