| 2003 |
SASH1 was identified as a member of the SH3/SAM adapter molecule family, encoded on chromosome 6q24.3, with protein domain structure comprising SH3 and SAM domains, suggesting a role in signaling pathways; it is predominantly expressed in breast, lung, thyroid, spleen, placenta and thymus. |
In silico expression analysis, LOH mapping, transcript characterization |
Oncogene |
Medium |
12771949
|
| 2011 |
SASH1 localizes to the nucleus, cytoplasm, lamellipodia, and membrane ruffles where it co-distributes with the actin cytoskeleton; it directly interacts with the oncoprotein cortactin; SASH1 overexpression increases filamentous actin content and cell protrusions, inhibits cell migration, and increases cell adhesion to fibronectin and laminin, while SASH1 knockdown reduces cell-matrix adhesion. The actin-regulatory activity maps to the central conserved domain. |
Immunofluorescence localization, co-distribution assays, structural mutant analysis, F-actin quantification, migration and adhesion assays, RNAi knockdown |
The international journal of biochemistry & cell biology |
High |
21820526
|
| 2013 |
SASH1 acts as a scaffold molecule in endothelial TLR4 signaling by independently binding TRAF6, TAK1, IκB kinase α, and IκB kinase β; this interaction fosters ubiquitination of TRAF6 and TAK1 and promotes LPS-induced NF-κB, JNK, and p38 activation, resulting in increased proinflammatory cytokine production and increased LPS-induced endothelial migration. |
Co-immunoprecipitation, ubiquitination assays, NF-κB/JNK/p38 activation assays, cytokine measurement, migration assay |
Journal of immunology |
High |
23776175
|
| 2013 |
SASH1 mutations found in dyschromatosis patients cause increased cell migration of A375 melanoma cells and induce enhanced binding with IQGAP1 and Gαs; SASH1 mutations lead to uniform loss of E-Cadherin, suggesting SASH1 regulates IQGAP1-E-Cadherin signaling to control melanocyte transepithelial migration. |
Functional migration assays, co-immunoprecipitation/binding assays, immunofluorescence for E-Cadherin, patient-derived tissue analysis |
Cellular signalling |
Medium |
23333244
|
| 2016 |
SASH1 is cleaved by caspase-3 following UVC-induced apoptosis; the C-terminal fragment (aa 231–1247) translocates from cytoplasm to the nucleus where it associates with chromatin. Wild-type SASH1 or the cleaved form increases apoptosis; mutation of the caspase-3 cleavage site prevents nuclear translocation and inhibits apoptosis. SASH1 cleavage is also required for efficient nuclear translocation of NF-κB, and the apoptotic effect of SASH1 is NF-κB-dependent. |
Caspase-3 cleavage assay, site-directed mutagenesis of cleavage site, subcellular fractionation, live-cell imaging, apoptosis assays, NF-κB inhibitor (DHMEQ) treatment |
Cell death & disease |
High |
27831555
|
| 2016 |
SASH1 is regulated by a p53/POMC/α-MSH/Gαs/SASH1 cascade to mediate melanogenesis upon UV stimulation; a positive feedback loop between SASH1 and p53 is modulated by SASH1 mutations to induce pathological hyperpigmentation in dyschromatosis universalis hereditaria. |
Reporter assays, expression analysis of pathway components, UV stimulation, functional pigmentation assays in patient cells |
Journal of cellular and molecular medicine |
Medium |
27885802
|
| 2018 |
SASH1 interacts with the oncoprotein CRKL via direct protein-protein interaction (identified by yeast 2-hybrid and Co-IP/mass-spectrometry, confirmed by domain mapping and site-directed mutagenesis); SASH1 inhibits CRKL-mediated activation of SRC kinase, thereby counteracting EMT; SASH1-deficient cells form significantly more metastases in vivo and this depends entirely on CRKL. |
Yeast 2-hybrid, Co-IP/mass-spectrometry, domain mapping, site-directed mutagenesis, dynamic mass redistribution assays, CRISPR/Cas9 knockout, orthotopic mouse metastasis model, EMT assays |
Cellular and molecular gastroenterology and hepatology |
High |
30480076
|
| 2019 |
Endothelial Sash1 interacts with β-arrestin 1 downstream of the TLR4 pathway to activate Akt and endothelial nitric oxide synthase (eNOS) in microvascular endothelial cells; nitric oxide generated downstream of Sash1 affects alveolar epithelial cells in a cGMP-dependent manner, inducing maturation of alveolar type 1 and 2 cells and promoting surfactant production. Sash1-/- mice die perinatally due to respiratory distress caused by delayed alveolar epithelial maturation. |
Sash1 knockout mice (constitutive and endothelial-restricted), Co-immunoprecipitation (Sash1/β-arrestin 1), eNOS activity assays, nitric oxide measurement, cGMP pathway assays, histology/surfactant protein analysis |
Cell reports |
High |
31067462
|
| 2019 |
HMGB1 binds to CpG islands in the SASH1 gene promoter and promotes methylation of the SASH1 gene, leading to downregulation of SASH1 expression. In astrocytes, SASH1 knockdown reduces cell adhesion and increases invasion via decreased integrin β8 expression; SASH1 overexpression promotes cell adhesion and decreases invasion. |
ChIP assay (HMGB1 binding to SASH1 CpG islands), methylation assay, siRNA knockdown, overexpression, adhesion and invasion assays, Western blot for integrin β8 |
Cell death & disease |
Medium |
31138780
|
| 2020 |
SASH1 knockdown downregulates LATS1 phosphorylation and its effector YAP, upregulating YAP accumulation and its target CYR61; SASH1 expression has the opposite effect. LATS1 phosphorylates SASH1 at S407, and the S407A phosphorylation-deficient mutant fails to rescue altered YAP signaling. YAP upregulates ARHGAP42 via YAP-TEAD, and the YAP-ARHGAP42-actin axis mediates SASH1-regulated TNBC cell invasion. |
siRNA knockdown, ectopic overexpression, phosphorylation analysis, SASH1-S407A mutant, pharmacological YAP inhibition, YAP knockdown epistasis, in vivo CAM and xenograft models |
Oncogene |
High |
32523092
|
| 2020 |
SASH1 co-localizes with circumferential actin bundles and linear adherens junctions in normal epithelial cells; SASH1 depletion by RNAi in IAR-20 cells destroys stable linear adherens junctions and induces mesenchymal phenotype, demonstrating SASH1 is required for maintenance of stable cell-cell adhesion. |
Immunofluorescence, confocal microscopy, RNAi knockdown, adherens junction morphology analysis |
Biochemistry. Biokhimiia |
Medium |
32586229
|
| 2020 |
The SASH1 c.1761C>G (p.Ser587Arg) mutation downregulates THBS1 expression and inactivates TGF-β1 signaling; SASH1 mutations promote melanocyte migration and invasion while TGF-β1 negatively regulates SASH1 protein expression, establishing a SASH1-THBS1-TGF-β1 signaling cross-talk. |
Bioinformatics, site-directed mutagenesis in PIG1 cells, Transwell migration and wound-healing assays, Western blot for TGF-β1 pathway components |
International journal of biological sciences |
Medium |
32174800
|
| 2020 |
In a heterozygous SASH1 Y551D knock-in mouse model, mutated SASH1 increases microphthalmia-associated transcription factor (Mitf) expression in epithelial tissues; increased Mitf-positive epithelial cells were detected in vivo and in affected individuals, indicating SASH1 functions as a scaffold to regulate Mitf expression in the cell nucleus. |
BALB/c knock-in mouse model, immunohistochemistry, Western blot, in vitro cell assays |
International journal of molecular medicine |
Medium |
32582980
|
| 2022 |
The SAM1 domain of SASH1 exists primarily as a disordered monomer with a minor oligomer in solution (unlike the dimerizing SAM domain of SASH3); NMR relaxation and exchange experiments revealed exchange between a disordered monomer and a more structured oligomer on multiple timescales; D663A/T664K substitutions in SAM1 increased oligomerization, identifying a key region controlling oligomerization. |
SEC-MALS, SE-HPLC, NMR (relaxation, exchange experiments), site-directed mutagenesis |
Journal of structural biology |
High |
36341956
|
| 2022 |
SASH1 knockdown in hemangioma endothelial cells suppresses TRAF6 ubiquitination (reducing TRAF6 degradation) and thereby destabilizes EZH2 (promoting EZH2 ubiquitination and degradation); SASH1 thus regulates EZH2 expression through TRAF6 ubiquitination in hemangioma cells. |
Co-immunoprecipitation, ubiquitination assays, siRNA knockdown, overexpression, Western blot |
Experimental cell research |
Medium |
35772492
|
| 2023 |
SASH1 SAM1 domain selectively interacts with Eph receptor SAM domains, with highest affinity for EphA8; the crystal structure of the EphA8-SASH1 complex revealed specific intermolecular interactions; cancer mutations EphA8 R942H or G978D impair this interaction; SAM-SAM interaction is critical for SASH1-mediated regulation of EphA8 kinase activity. |
Yeast 2-hybrid, biochemical binding assays, X-ray crystallography, co-immunoprecipitation, co-localization, kinase activity assays, cancer mutation analysis |
Journal of molecular biology |
High |
37619706
|
| 2023 |
SASH1 was identified as a novel binding partner of Caskin1/2 through SAM-SAM domain interactions; the SASH1-SAM1/Caskin1-SAMs interaction (characterized by SEC, ITC, GST pulldown, and Co-IP) disrupts Caskin1 tandem SAM homopolymers, as verified by sedimentation, TEM, and immunofluorescence in heterologous cell lines. |
Yeast 2-hybrid, SEC, ITC, GST pulldown, Co-IP, AlphaFold2 structural modeling, mutagenesis, sedimentation assay, TEM, immunofluorescence |
The FEBS journal |
High |
39688081
|
| 2023 |
HMGB1 forms a physical complex with SET and HAT1 (HMGB1/SET/HAT1 complex) that inhibits H3K9 and H3K27 acetylation at the SASH1 locus in lung adenocarcinoma cells, thereby suppressing SASH1 expression and facilitating glycolysis and metastasis. |
Co-immunoprecipitation, ChIP-seq for histone modifications, knockdown/overexpression in vitro and in vivo, transcriptomic analysis |
Oncogene |
Medium |
37794134
|
| 2024 |
LATS2 phosphorylates SASH1 as part of a MAP4K4-LATS2-SASH1-YAP1 cascade in luminal breast cancer; MAP4K4 negatively regulates LATS2, SASH1 expression, and YAP1 phosphorylation; combined ectopic MAP4K4 expression and SASH1 silencing promote YAP1/TAZ nuclear translocation and downstream transcriptional regulation, mediating ER signaling, tumorigenesis, and metastasis. |
Expression correlation, siRNA/ectopic expression, phosphorylation analysis, in vitro and in vivo tumor models, targeted MAP4K4 inhibition |
The Journal of biological chemistry |
Medium |
38657867
|
| 2024 |
SASH1 interacts with TNKS2 (tankyrase 2) via a tankyrase-binding motif located in the SPIDER/SLY domain (around residue S519); the S519N disease variant alters binding kinetics and affinity for TNKS2; TNKS2 interaction is required for SASH1's promotion of stem-like characteristics in human melanocytes. |
Yeast 2-hybrid screening, biochemical binding assays (kinetics/affinity), cell-based stem cell assays, clinical examination of variant carriers |
The Journal of investigative dermatology |
Medium |
38848986
|
| 2017 |
SASH1 is required for lumen formation in a 3D breast epithelial culture model; RNAi inhibition of SASH1 prevents lumen formation; SASH1 acts upstream of DLK1 (a NOTCH1 inhibitor), and SASH1 loss leads to DLK1 downregulation, which in turn increases NOTCH1 and its target genes HES1 and HEY1; pharmacological inhibition of NOTCH signaling (γ-secretase inhibitor) also inhibits lumen formation. |
RNAi knockdown, 3D culture lumenogenesis assay, gene array, γ-secretase inhibitor epistasis |
Experimental cell research |
Medium |
28823832
|
| 2026 |
SASH1 physically interacts with PKM2 in astrocytes, sequestering PKM2 in the cytoplasm; SASH1 depletion leads to increased nuclear accumulation of PKM2, upregulation of Glut1 and lactate dehydrogenase A, increased glucose uptake and lactate release (shift toward aerobic glycolysis); a peptide blocking SASH1-PKM2 interaction reduces astrocyte activation and promotes tissue repair in a mouse TBI model. |
Co-immunoprecipitation (SASH1-PKM2), nuclear fractionation, glucose uptake and lactate assays, qPCR for Glut1/LDHA, peptide drug design and in vivo TBI mouse model |
Brain research |
Medium |
41690666
|
| 2015 |
SASH1 is expressed predominantly in the cytoplasm of human aortic endothelial cells (HAECs); SASH1 knockdown in HAECs results in increased cell migration, proliferation, and angiogenesis, and decreases CYP1A1 expression possibly through inhibition of TP53 activity. |
siRNA knockdown, immunostaining and subcellular fractionation for localization, wound healing/WST-1/Matrigel assays, transcriptomic and pathway analyses |
Atherosclerosis |
Medium |
26318107
|
| 2023 |
NMR backbone assignment of the SASH1 SPIDER region (SLy Proteins Associated Disordered Region, aa 400–554) revealed it is intrinsically disordered in solution; the S519N disease variant does not alter the free-form solution structural propensities of SPIDER. |
Deuteration, TROSY-based 3D NMR, HNN experiments, chemical shift comparison |
Biomolecular NMR assignments |
High |
37155029
|