| 2008 |
Mouse Bicc1 KH domains bind RNA in vitro; specifically, the third KH domain is necessary and sufficient for homoribopolymer binding in vitro. The jcpk PKD-causing mutation abolishes this RNA-binding activity. |
In vitro RNA-binding assays with deletion constructs of mBicc1 protein |
Nephron. Experimental nephrology |
Medium |
18182784
|
| 2009 |
Bicc1 physically interacts with SamCystin (ANKS6) in kidney cells; SamCystin self-associates and Bicc1–SamCystin interact by co-immunoprecipitation. The Han:SPRD-Cy rat PKD mutation disrupts SamCystin self-association but not the Bicc1–SamCystin interaction. RNA may be a component of the Bicc1–SamCystin complex. |
Co-immunoprecipitation of epitope-tagged recombinant proteins transiently transfected in IMCD cells |
Biochemical and biophysical research communications |
Medium |
19324013
|
| 2010 |
Bicc1 knockdown (shRNA) in IMCD cells disrupts normal tubulomorphogenesis, induces cystogenesis in 3D culture, and causes defects in E-cadherin-based cell–cell adhesion, actin cytoskeleton organization, cell–matrix interactions, proliferation, and apoptosis. |
Stable shRNA knockdown of Bicc1 in IMCD cells; 3D culture morphogenesis assay, immunofluorescence for E-cadherin and actin |
European journal of cell biology |
Medium |
20219263
|
| 2011 |
Human BICC1 blocks canonical Wnt signaling, largely through its SAM domain. A nonsense mutation in the first KH domain abolishes Wnt inhibitory activity; a missense mutation in the SAM domain (equivalent to full SAM deletion) reduces activity by ~22%. |
Wnt reporter assays in cell lines with wild-type and mutant BICC1 constructs; patient mutation analysis |
Human mutation |
Medium |
21922595
|
| 2012 |
Bicc1 KH domains bind AC6 mRNA and recruit miR-125a from Dicer; the SAM domain enables silencing through Argonaute and TNRC6A/GW182. Bicc1 similarly recruits miR-27a to silence PKIα mRNA. Loss of Bicc1 leads to upregulation of AC6 and elevated cAMP in cystic kidneys. |
RNA immunoprecipitation, reporter silencing assays, Bicc1 knockout mouse kidney analysis (cAMP measurement, AC6 expression), co-immunoprecipitation with Dicer/Argonaute/GW182 |
Journal of molecular cell biology |
High |
22641646
|
| 2014 |
Bicc1 regulates Pkd2 transcript levels in osteoblasts; Bicc1 knockdown and Pkd2 knockdown each impair osteoblastogenesis, and Pkd2 overexpression rescues Bicc1-deficiency-dependent osteoblast defects, placing Pkd2 downstream of Bicc1 in osteoblast differentiation. |
Bicc1 heterozygous null mice (low BMD phenotype), siRNA knockdown of Bicc1 and Pkd2 in osteoblast cultures, rescue by Pkd2 overexpression, co-expression network analysis |
The Journal of clinical investigation |
Medium |
24789909
|
| 2014 |
Loss of polycystin-1 (PC1/Pkd1) downregulates Bicc1 expression in vitro and in vivo, revealing a molecular link between PKD1 and BICC1 in kidney development. |
Immunohistochemistry and western blot in Pkd1 knockout mice and Pkd1-depleted cell lines |
PloS one |
Medium |
24594709
|
| 2015 |
Bicc1 SAM domain self-polymerizes in vitro in a left-handed helix; this polymerization concentrates Bicc1 in cytoplasmic clusters that localize and silence bound mRNA (e.g., AC6). SAM polymerization also stabilizes Bicc1 protein and is required for inhibition of Dishevelled 2 in the Wnt/β-catenin pathway. The bpk mutation (C-terminal SAM extension) phenocopies polymerization-deficient mutants. |
Structure modeling of SAM domain; SAM interface mutagenesis; subcellular localization by fluorescence microscopy; mRNA silencing reporter assays; Wnt reporter assay; protein stability measurement |
Molecular and cellular biology |
High |
26217012
|
| 2015 |
BICC1 knockdown in the rat hippocampus protects against CUS-induced anhedonia, establishing a functional role for elevated BICC1 in depressive behavior. Neuronal activity downregulates BICC1 in vitro; acute ketamine rapidly decreases BICC1 mRNA in vivo. |
In vivo hippocampal knockdown via viral vector, sucrose preference test (CUS model); in vitro neuronal stimulation with BICC1 mRNA measurement |
Neuropsychopharmacology |
Medium |
25178406
|
| 2017 |
Crystal structure of Bicc1 SAM polymer determined at high resolution, revealing a canonical head-to-tail SAM polymer with flexibility in subunit interface orientations. ANKS3 recruits ANKS6 to Bicc1, and together the three proteins cooperatively generate giant macromolecular complexes through SAM domain interactions and flanking sequences. |
X-ray crystallography of Bicc1 SAM domain; co-immunoprecipitation and domain-mapping of full-length and truncated Bicc1, ANKS3, ANKS6 proteins |
Structure |
High |
29290488
|
| 2021 |
Bicc1 preferentially recognizes GACR and YGAC sequences and specifically binds a conserved GACGUGAC motif in the proximal Dand5 3'-UTR. Bicc1 interacts with Cnot3 of the Ccr4-Not deadenylase complex, and this interaction is required for leftward Dand5 mRNA decay at the mouse embryonic node downstream of Pkd2 and Ca2+ signaling. |
3'-UTR deletion/mutation reporter assays in mouse embryos; RNA pull-down/binding assays; co-immunoprecipitation of Bicc1 with Cnot3; genetic analysis in Bicc1 and Pkd2 mutant mice; Ca2+ manipulation |
Nature communications |
High |
34210974
|
| 2021 |
Bicc1 post-transcriptionally represses dand5 and gdf3 via their 3'-UTRs in Xenopus, zebrafish, and mouse during symmetry breaking. Two distinct Bicc1 functions on dand5 mRNA exist: pre-flow (mRNA stability) and post-flow (translational inhibition). Bicc1-mediated translational repression of dand5 3'-UTR reporter is responsive to Pkd2, placing Bicc1 downstream of Pkd2 flow sensing. Bicc1 cooperates with Dicer1 in this process. |
3'-UTR reporter assays; morpholino/CRISPR knockdown in Xenopus and zebrafish; genetic rescue; co-injection experiments with pkd2 manipulations; mRNA stability vs. translation assays |
Nature communications |
High |
34531379
|
| 2023 |
As an RNA-binding protein, BICC1 binds the 3'-UTR of LCN2 (Lipocalin-2) mRNA and post-transcriptionally upregulates LCN2 expression in pancreatic cancer cells, leading to JAK2/STAT3 activation and CXCL1-driven VEGF-independent angiogenesis. |
RNA immunoprecipitation (RIP) of BICC1 with LCN2 3'-UTR; reporter assays; BICC1 knockdown/overexpression in PAAD cells and xenograft mouse models; signaling pathway analysis |
Signal transduction and targeted therapy |
Medium |
37443111
|
| 2023 |
ANKS3 C-terminal coiled-coil domain interacts with Bicc1 and inhibits target mRNA binding; ANKS6 recruits to ANKS3 and relieves this inhibition, restoring Bicc1-mediated Dand5 mRNA decay. A CRISPR-truncated ANKS3 causes symmetric (bilateral) mRNA decay, demonstrating that ANKS3 conformation governs the left-right specificity of Bicc1 RNP activity. |
AlphaFold structure prediction with biochemical validation by in vitro reconstitution; CRISPR-engineered ANKS3 truncation in mouse; RNA-binding assays; co-immunoprecipitation |
PLoS biology |
High |
37733651
|
| 2023 |
Bicc1 SAM-domain head-to-tail polymers are interconnected by KH domains forming a protein meshwork that mediates liquid-to-gel phase transitioning of client mRNAs. ANKS3 disperses Bicc1 granules and releases bound mRNAs, while co-recruitment of ANKS6 by ANKS3 reinstates Bicc1 condensation and ribonucleoparticle assembly. |
Live-cell fluorescence microscopy of Bicc1 condensates; co-transfection with ANKS3/ANKS6 constructs; RNA phase-partitioning assays; domain-mapping experiments |
iScience |
Medium |
37275520
|
| 2024 |
BICC1 upregulates IDO1 (indoleamine 2,3-dioxygenase-1) expression, activating tryptophan catabolism in pancreatic cancer cells. Increased tryptophan metabolites drive NAD+ synthesis and oxidative phosphorylation, promoting a stem cell-like phenotype and chemoresistance. |
BICC1 knockdown/overexpression in PDAC cells and organoids; metabolomics; IDO1 expression analysis; NAD+ and OXPHOS measurement; xenograft and patient-derived models |
Science advances |
Medium |
38896624
|
| 2024 |
NEDD4L E3 ubiquitin ligase mediates ubiquitination and proteasomal degradation of BICC1 protein. NEDD4L overexpression promotes BICC1 ubiquitination and degradation, inhibiting gastric cancer cell EMT and proliferation. BICC1 activates the PI3K/AKT pathway to facilitate cancer progression. |
Co-immunoprecipitation to detect NEDD4L–BICC1 interaction; ubiquitination assay; BICC1 knockdown/NEDD4L overexpression in GC cells and xenograft models; PI3K/AKT pathway western blot |
The Kaohsiung journal of medical sciences |
Medium |
39717922
|
| 2025 |
BICC1 physically binds Polycystin-1 (PKD1) and Polycystin-2 (PKD2) proteins via distinct protein domains. Bicc1 depletion in conjunction with Pkd1 or Pkd2 loss aggravates PKD severity in Xenopus and mouse models. Human BICC1 hypomorphic variants identified in VEO-PKD patients impacted disease-relevant signaling pathways in genome-edited kidney cells. |
Co-immunoprecipitation/biochemical binding assays; Xenopus and mouse double-knockout/depletion studies; CRISPR genome editing of human kidney cells; genetic analysis of ADPKD patient cohort |
eLife |
High |
39253489 41677782
|
| 2025 |
N6-methyladenosine (m6A) modification of the conserved AGACGUGAC motif in Dand5 3'-UTR disrupts binding to Bicc1 KH domains in vitro, revealing m6A as a negative regulator of Bicc1 target mRNA recognition. This contrasts with IGF2BP and FMR1 KH domains, for which m6A promotes RNA binding. |
In vitro RNA-binding assays comparing m6A-modified vs. unmodified Dand5 3'-UTR oligonucleotides with Bicc1 KH domain protein |
RNA |
Medium |
40634109
|