SMU1

Last update 08 May 2025

Basic Info

Synonyms

BWD, FLJ10805, fSAP57

+ [6]

Introduction

Involved in pre-mRNA splicing as a component of the spliceosome (PubMed:28781166). Regulates alternative splicing of the HSPG2 pre-mRNA (By similarity). Required for normal accumulation of IK (PubMed:24945353). Required for normal mitotic spindle assembly and normal progress through mitosis (By similarity). (Microbial infection) Required, together with IK, for normal splicing of influenza A virus NS1 pre-mRNA, which is required for the production of the exportin NS2 and for the production of influenza A virus particles. Not required for the production of VSV virus particles.

100 Clinical Results associated with SMU1

100 Translational Medicine associated with SMU1

0 Patents (Medical) associated with SMU1

Literatures (Medical) associated with SMU1

19 Nov 2024·Proceedings of the National Academy of Sciences

Cotranscriptional splicing is required in the cold to produce COOLAIR isoforms that repress Arabidopsis FLC

Article

Author: He, Hang ; Liu, Yue ; Yang, Hongchun ; Zhang, Xiaoling ; Long, Xiaogang ; Fang, Xiaofeng ; Cai, Yajun ; Xu, Guoyong ; Li, Wenjuan ; Dean, Caroline ; Xuan, Hua ; Zhang, Hongya ; Huang, Xiaoyi ; Wang, Huamei

Plants use seasonal cold to time the transition to reproductive development. Short- and long-term cold exposure is registered via parallel transcriptional shutdown and Polycomb-dependent epigenetic silencing of the Arabidopsis thaliana major flowering repressor locus FLOWERING LOCUS C ( FLC ). The cold-induced antisense transcripts ( COOLAIR ) determine the dynamics of FLC transcriptional shutdown, but the thermosensory mechanisms are still unresolved. Here, through a forward genetic screen, we identify a mutation that perturbs cold-induced COOLAIR expression and FLC repression. The mutation is a hypomorphic allele of SUPPRESSORS OF MEC-8 AND UNC-52 1 (SMU1), a conserved subunit of the spliceosomal B complex. SMU1 interacts in vivo with the proximal region of nascent COOLAIR and RNA 3′ processing/cotranscriptional regulators and enhances COOLAIR proximal intron splicing to promote specific COOLAIR isoforms. SMU1 also interacts with ELF7, an RNA Polymerase II Associated Factor (Paf1) component and limits COOLAIR transcription. Cold thus changes cotranscriptional splicing/RNA Pol II functionality in an SMU1-dependent mechanism to promote two different isoforms of COOLAIR that lead to reduced FLC transcription. Such cotranscriptional mechanisms are emerging as important regulators underlying plasticity in gene expression.

01 Jan 2024·Cancer Control

SMU1 Knockdown Suppresses Gastric Carcinoma Growth, Migration, and Invasion and Modulates the Cell Cycle

Article

Author: He, Nan ; Qian, Meirui ; Ma, Jing ; Zhang, Chen ; Liang, Xue ; Zeng, Qingmei

Introduction The role of SMU1 in DNA replication and RNA splicing is well-established, yet its specific function and dysregulated mechanisms in gastric cancer (GC) remain inadequately elucidated. This study seeks to investigate the potential oncogenic and progression-promoting effects of SMU1 in GC, with the ultimate goal of informing novel approaches for treatment and diagnosis. Methods The study investigated the expression levels of SMU1 in GC and adjacent normal tissues by analyzing data from the TCGA (27 tissue pairs) and GEO (47 tissue pairs) databases. Immunohistochemistry was used to examine 277 tumor tissue and adjacent non-tumor tissue spots from GC tissue chips, along with relevant follow-up information. The study further assessed the proliferation, invasion, and migration capabilities of cells by manipulating SMU1 expression levels and conducting various assays, including CCK-8, EdU incorporation, colony formation, transwells, flow cytometry, and subcutaneous tumorigenesis assays. Results Our study revealed a significant upregulation of SMU1 mRNA and protein levels in GC tissues compared to adjacent tissues. Univariate and multivariate Cox analysis demonstrated that elevated levels of SMU1 were independent prognostic factors for GC prognosis ( P = 0.036). Additionally, median survival analysis indicated a significant association between high SMU1 expression and poor prognosis in GC patients ( P = 0.0002). In experiments conducted both in vivo and in vitro, it was determined that elevated levels of SMU1 can enhance the proliferation, invasion, and migration of GC cells, whereas suppression of SMU1 can impede the progression of GC by modulating the G1/S checkpoint of the cell cycle. Conclusions Our research introduces the novel idea that SMU1 could serve as a prognostic marker for GC progression, influencing cell proliferation through cell cycle activation. These results offer valuable insights into the understanding, diagnosis, and management of gastric carcinoma.

01 May 2023·Reproduction in Domestic Animals

Dynamic changes of 3′UTR length during oocyte‐to‐zygote transition of in vitro pig embryos

Article

Author: Wu, Zi‐Wei ; Yang, Cai‐Xia ; Wang, Yi ; Zhao, Han ; Zhang, Rong ; Du, Zhi‐Qiang

AbstractAlternative polyadenylation (APA) generates different 3′‐untranslated regions (3′UTRs) to regulate gene expression and localization, and affects a variety of biological processes. Here, we characterized the 3′UTR dynamics during the oocyte‐to‐zygote transition by analysing our previously reported porcine single‐cell RNA‐seq (scRNA‐seq) datasets (in vitro matured metaphase II (MII) oocytes, in vitro fertilized zygotes (IVF1) and parthenogenetically activated 1‐cell embryos (PA1)). After IVF1 versus MII comparison, dynamic analyses of APA from RNA‐seq (DaPars) method identified 139 mRNAs with significantly different 3′UTRs (padj. ≤ .05), mainly enriched in cell cycle, regulation of cyclin‐dependent protein kinase activity, histone modification, mRNA surveillance, and regulation of actin cytoskeleton. For PA1 versus MII comparison, 105 mRNAs with significantly different 3′UTRs (padj. ≤ .05) were identified to be mainly enriched in intracellular transport, mitotic spindle organization, cell cycle, pyruvate metabolism and glycolysis/gluconeogenesis. Furthermore, there were 7 mRNAs with more significant 3′UTR differences (|△PDUI| ≥ 0.45 and |log2[PDUI ratio]| ≥ 0.59) respectively in IVF1 versus MII (Lrp2bp, Mtfr2, Nhlrc2, Psip1, Smu1, Ssr1 and Wtap) and PA1 versus MII (Asf1b, Dimt1, Nap1l1, Ncoa4, Nudt21, Pnn and Rpl15) comparisons. Integrative genomics viewer analysis further identified that 3′UTRs of Psip1, Smu1, Ssr1 and Wtap had more than 140 nt average length changes, whereas those of Dimt1, Nap1l1 and Rpl15 were shortened with more than 460 nt. Regulatory elements (PAS, CPE, microRNA binding sites and m6A sites) in 3′UTRs of different lengths were predicted. Our findings provide useful information to further investigate the molecular mechanism of 3′UTR in regulating the oocyte‐to‐zygote transition of pig embryos.

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SMU1

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