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Cyclin-dependent kinase 1 (CDK1) and CDK2 have opposing roles in regulating interactions of splicing factor 3B1 with chromatin
The NOTCH1 and SF3B1 mutations accompany biological markers of unfavorable prognosis in patients with chronic lymphocytic leukemia.
Small but widespread reduction of intron-retaining isoforms is the most frequent splicing alteration in bone marrow samples from myelodysplasia patients.
PHF5A-SF3B1 forms a central node for binding to splicing modulators
SF3B1 Mutation is associated with Myelodysplastic Syndrome.
Prognostic interaction between bone marrow morphology and SF3B1 and ASXL1 mutations in myelodysplastic syndromes with ring sideroblasts.
SF3B1 mutations were also associated with del(11q), which is prognostically different from inv(3)(q21q26.2)
Results find that SF3B1 retained intron 4 (i4) harbors cryptic exons that are highly conserved and decoy exon E4e can promote intron retention at heterologous sites.
Integrated ERK1/ERK2 response to B-cell receptor stimulation and SF3B1 gene mutations refine prognosis in chronic lymphocytic leukemia.
could confirm the very good prognosis of MDS patients with del(11q) as described in the IPSS-R and identified a very high frequency of SF3B1 mutations, a relatively low ASXL1 and TP53 mutation frequency, as well as a lack of EZH2 mutations as possible molecular reason for this favorable outcome
SF3B1R625C/H mutations were enriched in non-uveal melanoma compared to other "hotspot" mutations. SF3B1K700E mutations predominated in breast carcinoma (8/11 samples, 73%), similar to myelodysplastic syndrome and chronic lymphocytic leukemia.
In this report we show that patients with uveal melanoma harbor mutation-specific chromosomal patterns in the tumor. These chromosomal patterns are characterized by different types of chromosomal anomalies, thus illustrating that distinct biological mechanisms underlie uveal melanoma pathogenesis.
Our findings suggest that the genetic profile of coexistent GNAQ or GNA11 mutations with BAP1 or SF3B1 mutations can aid the histopathological diagnosis of blue nevus-like melanoma and distinguish blue nevus-like melanoma from conventional epidermal-derived melanomas.
Mutation in SF3B1 gene is associated with mucosal melanoma.
These data provide a catalog of copy-number associated gene dependencies and identify partial copy-loss of wild-type SF3B1 as a novel, non-driver cancer gene dependency.
although blocking the function of SF3b elicits a massive accumulation of unspliced pre-mRNAs in the nucleus, intron-containing transcripts can still bind the ALYREF export factor and be transported to the cytoplasm, where they trigger an alternative nonsense-mediated decay pathway.
this study shows that DNMT3A mutations are present in a significant proportion of SF3B1mut patients with RARS and its presence has a clearly negative impact on outcomes, determining a higher RBC transfusion dependency, higher risk of progression to AML, and lower OS.
Somatic SF3B1 mutations are associated with metastatic NUT midline carcinoma.
Fanconi anemia FANCD2 and FANCI proteins regulate the nuclear dynamics of splicing factors, such as SF3B1.
The frequently mutated SF3B1 residues contact the pre-mRNA splice site. Based on structural homology with other spliceosome subunits, and recent findings of altered RNA binding by mutant U2AF1 proteins, we suggest that affected U2AF1 residues also contact pre-mRNA.
Our findings demonstrate that, despite significant differences in affected transcripts, there is overlap in the phenotypes associated with SF3B1-K700E between human and mouse.
Sf3b1(K700E) mice develop macrocytic anemia due to a terminal erythroid maturation defect, erythroid dysplasia, and long-term hematopoietic stem cell (LT-HSC) expansion.
myocardial hypoxia actuates fructose metabolism in human and mouse models of pathological cardiac hypertrophy through hypoxia-inducible factor 1alpha (HIF1alpha) activation of SF3B1 and SF3B1-mediated splice switching of KHK-A to KHK-C
Sf3b1 isrequired for the blastocyst formation.
SF3B1 plays an important role in the regulation of hematopoietic stem cells, whereas SF3B1 haploinsufficiency itself is not associated with the myelodysplastic syndrome phenotype with ring sideroblasts.
The level of Sf3b1 expression is critical for the proliferative capacity of hematopoietic stem cells. Depletion of Sf3b1 impairs proliferative capacity of hematopoietic stem cells but is not sufficient to induce myelodysplasia.
SF3B1 haploinsufficiency leads to formation of ring sideroblasts in myelodysplastic syndromes.
the active spliceosome, containing SAP155 phosphorylated by DYRKIA, performs pre-mRNA splicing in spermatogonia during testicular development
active spliceosome, containing phosphorylated SAP155, performs pre-mRNA splicing on chromatin concomitant with transcription during testicular development.
Sf3b1 and Polycomb group (PcG) proteins interaction is essential for true PcG-mediated repression of Hox genes.
Data indicate that splicing factor 3b, subunit 1 (sf3b1) mutation causes aberrant splicing of sf3b1 resulting in functional and predicted non-functional transcripts and a 90% reduction in full-length Sf3b1 protein.
This gene encodes subunit 1 of the splicing factor 3b protein complex. Splicing factor 3b, together with splicing factor 3a and a 12S RNA unit, forms the U2 small nuclear ribonucleoproteins complex (U2 snRNP). The splicing factor 3b/3a complex binds pre-mRNA upstream of the intron's branch site in a sequence independent manner and may anchor the U2 snRNP to the pre-mRNA. Splicing factor 3b is also a component of the minor U12-type spliceosome. The carboxy-terminal two-thirds of subunit 1 have 22 non-identical, tandem HEAT repeats that form rod-like, helical structures. Alternative splicing results in multiple transcript variants encoding different isoforms.
, pre-mRNA processing 10
, pre-mRNA splicing factor SF3b, 155 kDa subunit
, spliceosome-associated protein 155
, splicing factor 3B subunit 1
, pre-mRNA-splicing factor SF3b 155 kDa subunit
, splicing factor 3b, subunit 1, 155 kDa
, transforming growth factor alpha regulated gene 4
, 146 kDa nuclear protein
, splicing factor 3b, subunit 1, 155kDa
, splicing factor 3B subunit 1-like
, splicing factor 3b, subunit 1, 155kD