XPO7 p21CIP1is -dependent a tumor suppressor senescence regulating

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Abstract

Senescence is a key barrier to neoplastic transformation. To identify senescence regulators relevant to cancer, we screened a genome-wide shRNA library. Here, we describe exportin 7 (XPO7) as a novel regulator of senescence and validate its function in telomere-induced, replicative, and oncogene-induced senescence (OIS). XPO7 is a bidirectional transporter that regulates the nuclear-cytoplasmic shuttling of a broad range of substrates. Depletion of XPO7 results in reduced levels of TCF3 and an impaired induction of the cyclin-dependent kinase inhibitor p21CIP1 during OIS. Deletion of XPO7 correlates with poorer overall survival in several cancer types. Moreover, depletion of XPO7 alleviated OIS and increased tumor formation in a mouse model of liver cancer. Our results suggest that XPO7 is a novel tumor suppressor that regulates p21CIP1 expression to control senescence and tumorigenesis.

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Innes, A. J., Sun, B., Wagner, V., Brookes, S., McHugh, D., Pombo, J., … Gil, J. (2021). XPO7 p21CIP1is -dependent a tumor suppressor senescence regulating. Genes and Development, 35(5–6), 379–391. https://doi.org/10.1101/GAD.343269.120

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