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The U6 snRNA m 6 A Methyltransferase METTL16 Regulates SAM Synthetase Intron Retention

Open access
Pendleton, Kathryn E., Chen, Beibei, Liu, Kuanqing, Hunter, Olga V., Xie, Yang, Tu, Benjamin P., Conrad, Nicholas K.·2017·Cell

Abstract

SUMMARY Maintenance of proper levels of the methyl donor S-adenosylmethionine (SAM) is critical for a wide variety of biological processes. We demonstrate that the N6-adenosine methyltransferase METTL16 regulates expression of human MAT2A, which encodes the SAM synthetase expressed in most cells. Upon SAM depletion by methionine starvation, cells induce MAT2A expression by enhanced splicing of a retained intron. Induction requires METTL16 and its methylation substrate, a vertebrate conserved hairpin (hp1) in the MAT2A 3´ UTR. Increasing METTL16 occupancy on the MAT2A 3´ UTR is sufficient to induce efficient splicing. We propose that under SAM-limiting conditions, METTL16 occupancy on hp1 increases due to inefficient enzymatic turnover, which promotes MAT2A splicing. We further show that METTL16 is the long-unknown methyltransferase for the U6 spliceosomal snRNA. These observations suggest that the conserved U6 snRNA methyltransferase evolved an additional function in vertebrates to regulate SAM homeostasis.

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Metadata

Authors
Pendleton, K. E., Chen, B., Liu, K., Hunter, O. V., Xie, Y., Tu, B. P., & Conrad, N. K.
Venue
Cell
Publisher
Elsevier BV
Published
2017-05
Volume
169
Issue
5
Pages
824-835.e14
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2616848081
Cited by
1,085
References
11
FWCI
24.46
Type
journal article
Language
en
Open access
bronze

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