ArticlebioRxiv : the preprint server for biology2024
The PRMT5-splicing axis is a critical oncogenic vulnerability that regulates detained intron splicing.
Article in bioRxiv : the preprint server for biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Protein arginine methyltransferase 5 (PRMT5) is a promising cancer target, yet it's unclear which PRMT5 roles underlie this vulnerability. Here, we establish that PRMT5 inhibition induces a special class of unspliced introns, called detained introns (DIs). To interrogate the impact of DIs, we depleted CLNS1A, a PRMT5 cofactor that specifically enables Sm protein methylation. We found that many, but not all, cell lines are CLNS1A-dependent and established that loss of viability is linked to loss of Sm protein methylation and DI upregulation. Finally, we discovered that PRMT5-regulated DIs, and the impacted genes, are highly conserved across human, and also mouse, cell lines but display little interspecies conservation. Despite this, human and mouse DIs have convergent impacts on proliferation by affecting essential components of proliferation-regulating complexes. Together, these data argue that the PRMT5-splicing axis, including appropriate DI splicing, underlies cancer's vulnerability to PRMT5 inhibitors.
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