| 2020 |
SON and SRRM2 form the core scaffold of nuclear speckles: depletion of SON alone causes partial disassembly, but co-depletion of SON and SRRM2, or depletion of SON in cells where SRRM2's intrinsically disordered regions (IDRs) are genetically deleted, causes near-complete dissolution of nuclear speckles. The SC35 monoclonal antibody, widely used as a nuclear speckle marker, was found to principally recognize SRRM2, not SRSF2. |
siRNA co-depletion, CRISPR-mediated IDR deletion, immunofluorescence, immunoblot, proteomics |
eLife |
High |
33095160
|
| 2022 |
SRRM2 forms biomolecular condensates consistent with liquid-liquid phase separation (spherical shape, dynamic rearrangement, coalescence, concentration dependence confirmed in vitro). SRRM2 organizes nuclear speckles throughout the cell cycle. SRRM2 deficiency causes skipping of cassette exons with short introns and weak splice sites. In THP-1 myeloid-like cells, SRRM2 depletion compromises cell viability, upregulates differentiation markers, and sensitizes cells to anti-leukemia drugs. SRRM2 induces a FES splice isoform that attenuates innate inflammatory responses and MUC1 isoforms with oncogenic shedding properties. |
EGFP-SRRM2 knock-in HEK293T cells, live-cell imaging, in vitro phase separation assay, RNA-seq after SRRM2 depletion, cell viability assays, drug sensitivity assays |
Nucleic acids research |
High |
35929045
|
| 2024 |
SRRM2 and SON form immiscible multiphases within nuclear speckles and are functionally independent, each regulating distinct subsets of alternative splicing targets. SRRM2 drives nuclear speckle subcompartmentalization via homotypic interaction (through RS domain oligomerization) and heterotypic non-selective protein-RNA coacervation-driven phase separation. Serine residues within the RS domains play an irreplaceable role in fine-tuning nuclear speckle liquidity; RS domains can be functionally replaced by synthetic oligomerizable modules for structural but not liquidity roles. |
Super-resolution imaging, FRAP, in vitro phase separation, domain swap/mutagenesis, RNA-seq, cell-based condensate assays |
Cell reports |
High |
38381607
|
| 2009 |
Yeast Cwc21p (ortholog of human SRm300/SRRM2) binds directly to two core spliceosomal proteins, Prp8p and Snu114p (U5 snRNP), making it the first NTC-related protein known to dock directly to U5 snRNP proteins. The conserved cwf21 domain in Cwc21p is the Prp8p binding site. Cwc21p and Isy1p have related functions at or prior to the first catalytic step of splicing. Human SRm300/SRRM2 is a functional ortholog of Cwc21p, also directly interacting with Prp8p and Snu114p. |
Direct binding assays, chemical cross-linking, proteomic analysis of the SCwid domain, genetic interaction (suppressor/synthetic lethality), co-immunoprecipitation |
RNA (New York, N.Y.) |
High |
19854871
|
| 2009 |
Yeast Cwc21p (ortholog of SRm300/SRRM2) shows strong genetic, physical, and functional interactions with Isy1p (implicated in the first catalytic step of splicing and splicing fidelity), and associates with spliceosomal complexes, supporting a role for Cwc21/SRm300 in spliceosome activation and splicing fidelity. |
Quantitative genetic interaction mapping, tandem affinity purification mass spectrometry, microarray profiling |
RNA (New York, N.Y.) |
Medium |
19789211
|
| 2003 |
SRRM2 (SRm300) physically interacts with Pinin (Pnn/DRS/memA) at the C-terminus of Pinin, and co-immunoprecipitates and co-localizes with Pinin and other SR-rich proteins (SRp75, SRrp130) in nuclear speckles in corneal epithelial cells, suggesting participation in a multiprotein nuclear complex involved in pre-mRNA processing. |
Yeast two-hybrid, co-immunoprecipitation, co-transfection with immunostaining in HCE-T and HEK-293 cells |
Investigative ophthalmology & visual science |
Medium |
14578391
|
| 2003 |
SRRM2 (as TAXREB803/SRL300) interacts with HTLV-1 Tax oncoprotein, co-immunoprecipitates with Tax, co-localizes with Tax by indirect immunofluorescence, enhances Tax-dependent transcription and CREB binding to TxRE. Knockdown of TAXREB803 by siRNA dramatically decreases Tax transactivation of the HTLV-1 LTR, identifying SRRM2 as a transcriptional coactivator for Tax. |
Co-immunoprecipitation, indirect immunofluorescence, luciferase reporter assay, siRNA knockdown |
Journal of virology |
Medium |
12941912
|
| 2013 |
RSR-2, the C. elegans ortholog of SRm300/SRRM2, is essential for viability and acts within the germline sex determination pathway (genetic epistasis). RSR-2 colocalizes with DNA in germline nuclei and co-precipitates with chromatin, with a ChIP-Seq profile similar to RNA Polymerase II. RSR-2 recruitment to chromatin is splicing-independent. RSR-2 interacts with RNAPII and affects RNAPII phosphorylation states. Strongest interacting partners identified by proteomics are PRP-8 and PRP-19. |
RNAi, genetic epistasis analysis, transcriptomics, ChIP-Seq, co-immunoprecipitation with RNAPII, proteomic analysis |
PLoS genetics |
Medium |
23754964
|
| 2017 |
Human cactin physically and functionally interacts with SRRM2 (co-immunoprecipitation), and this complex (along with DHX8) is required for efficient pre-mRNA splicing of thousands of transcripts and for sister chromatid cohesion. Cactin depletion impairs splicing of sororin (CDCA5) pre-mRNA, causing premature sister chromatid separation. |
Co-immunoprecipitation, siRNA depletion, RNA-seq splicing analysis, cell biology (chromosome segregation assay) |
Journal of cell science |
Medium |
28062851
|
| 2023 |
Nuclear arginyl-tRNA synthetase (ArgRS) interacts and co-localizes with SRRM2. During arginine depletion (as occurs in inflammation), nuclear ArgRS levels decrease, which correlates with changes in condensate-like nuclear trafficking of SRRM2 and altered splice-site usage in specific genes, leading to different protein isoforms that alter cellular metabolism and peptide presentation to immune cells. |
Co-immunoprecipitation, co-localization by imaging, arginine depletion experiments, RNA-seq splice site analysis, metabolic and immunopeptidome assays |
Nature cell biology |
Medium |
37059883
|
| 2015 |
The germline missense variant S346F in SRRM2 causes a higher ratio of exon inclusion in leukocytes of carriers compared to controls (RNA-seq and experimental validation of 7 exons), consistent with altered alternative splicing activity of SRRM2 due to this mutation. |
RNA-seq in human leukocytes from variant carriers vs. controls, experimental validation of specific exon inclusion events by RT-PCR |
Scientific reports |
Medium |
26135620
|
| 2000 |
SRL300 (SRRM2) protein was cloned as a binding protein for the 5'-noncoding sequence of ATBF1 mRNA; it contains a unique RNA-binding region and two large RS domains with multiple phosphorylation sites, and is detected in both human and rat cells. |
cDNA cloning, sequence analysis, immunodetection in human and rat cells |
Biochimica et biophysica acta |
Low |
11004489
|
| 2021 |
SRRM2, normally a nuclear speckle scaffold protein, is mislocalized to cytoplasmic lesions (neurofibrillary tangles) in Alzheimer's disease brain tissue and in transgenic tauopathy mice, with mislocalization severity correlating with pathological tau deposition. This identifies pathological tau as a driver of ectopic cytoplasmic accumulation of SRRM2. |
Immunohistochemistry and immunofluorescence in human AD tissue and transgenic mouse brain, correlation with tau pathology staging |
Acta neuropathologica communications |
Medium |
34187600
|
| 2025 |
A point mutation in SRRM2 associated with familial ALS causes loss of the protein-protein interaction between SRRM2 and the splicing factor ACIN1, and leads to widespread differential gene expression converging on dysregulation of synapse-associated pathways in a model cell line carrying the endogenous point mutation. |
Endogenous point mutation knock-in, co-immunoprecipitation (loss of ACIN1 interaction), transcriptomics (RNA-seq) |
bioRxivpreprint |
Medium |
|
| 2025 |
SRRM2 is a substrate/target of the nuclear speckle-localized kinase TAOK2: biochemical phosphoproteomics identifies SRRM2 (and SRRM1) as potential direct phosphorylation targets of TAOK2. TAOK2 knockdown perturbs speckle-resident SR proteins (including SRRM2-containing speckles) while leaving hnRNPs unperturbed, suggesting that TAOK2-mediated phosphorylation of SRRM2 plays a structural maintenance role at nuclear speckles. |
siRNA knockdown, cellular and biochemical phosphoproteomics, splicing and nuclear export transcriptomics, imaging of nuclear speckle integrity |
bioRxivpreprint |
Low |
|
| 2025 |
Polyphosphate (polyP) directly interacts with SRRM2 (the NS core component), and polyP depletion disrupts nuclear speckle organization. Mechanistically, polyP acts as a physiological inhibitor of CLK3 kinase, preventing phosphorylation of SR proteins and thereby maintaining nuclear speckle stability. |
BAR (Biotinylation by Antibody Recognition) proximity labeling, polyP depletion experiments, imaging of nuclear speckle integrity, RNA-seq, CLK3 kinase inhibition assay |
bioRxivpreprint |
Low |
|
| 2024 |
In senescent cells, SRRM2 is repurposed to cluster CTCF into senescence-induced clusters (SICCs) at nuclear speckles, together with BANF1. The RNA-binding domain of SRRM2 directs CTCF clustering, and SICC disruption fully reverts senescence-associated alternative splicing patterns, demonstrating that SRRM2-mediated nuclear speckle reorganization sustains the senescence splicing program. |
Functional assays, super-resolution imaging, 3D genomics, computational modelling, domain deletion (SRRM2 RNA-binding domain) |
bioRxivpreprint |
Low |
|
| 2025 |
Srrm2 haploinsufficiency in mice causes splicing dysregulation including reduction of SynGAP-γ isoform and mis-splicing of Agap3, reduced oligodendrocyte proportions in striatum, and decreased myelin-related gene expression. These AGAP3 splicing defects are conserved in human iPSC-derived neurons deficient in SRRM2. |
Srrm2+/- mouse model, single-nucleus RNA-seq, proteomics, human iPSC-derived neurons with SRRM2 depletion, EEG, behavioral assays |
Cell reports |
Medium |
42189682
|
| 2025 |
SRRM2 modulates levels of S6K1 and S6K2 to activate the mTOR-S6K pathway in colorectal cancer: SRRM2 facilitates S6K2 expression by modulating alternative splicing, and enhances S6K1 protein stability by regulating the E3 ubiquitin ligase WWP2. |
SRRM2 knockdown/overexpression, alternative splicing analysis (RNA-seq), protein stability assays, ubiquitin ligase regulation assays, in vitro and in vivo CRC growth assays |
Oncogene |
Medium |
39956864
|
| 2024 |
The intrinsically disordered region (IDR) of SRRM2 is required for enlarging nuclear speckles in the presence of HIV capsid, and HIV-induced CPSF6 puncta fuse with nuclear speckles via the IDR of SRRM2. |
Genetic manipulation and depletion of SRRM2 IDR, live-cell imaging of CPSF6 puncta/speckle fusion, domain deletion experiments |
bioRxivpreprint |
Low |
|
| 2024 |
Disruption of nuclear speckle integrity through SRRM2 downregulation promotes TDP-43 mislocalization from the nucleus and loss of TDP-43 splicing function. |
siRNA knockdown of SRRM2, TDP-43 localization imaging, cryptic exon splicing assays |
bioRxivpreprint |
Low |
|
| 2020 |
Srrm2 heterozygosity in embryonic stem cells induces loss of stemness, with coexistence of naive and formative pluripotency markers and changes in expression of SRF-regulated and differentiation-related genes. The earliest effects of Srrm2 heterozygosity are specific alternative splicing events on a small number of genes, followed by broader gene expression changes. |
Srrm2 heterozygous mouse ESC line, RNA interference, transcriptomics (RNA-seq), pluripotency marker immunofluorescence |
Biology open |
Medium |
38656788
|