| 2005 |
Human WRNIP1 purified as a homo-octameric complex with ATPase activity stimulated by double-stranded DNA ends; it directly interacts with DNA polymerase delta (pol δ) and stimulates pol δ DNA synthesis activity more than fivefold, increasing both processivity and initiation frequency. ATP addition partially suppressed this stimulation, and an ATPase-dead WRNIP1 mutant could still stimulate pol δ but was insensitive to ATP suppression. |
In vitro biochemical reconstitution (purified proteins), ATPase assay, DNA synthesis assay, gel filtration, mutant analysis |
Genes to cells |
High |
15670210
|
| 2002 |
S. cerevisiae WHIP/MGS1 (ortholog of WRNIP1) functionally interacts with DNA polymerase delta; its RFC-like motifs are essential for function. Overexpression causes synthetic dosage lethality with pol δ, RFC, PCNA, and RPA mutants. Loss of MGS1 suppresses hydroxyurea sensitivity of pol31 and pol32 (pol δ subunit) mutants, placing Mgs1 in the same functional pathway as pol δ. |
Genetic epistasis (synthetic dosage lethality screen, suppressor analysis, double-mutant growth assays in S. cerevisiae) |
Molecular genetics and genomics |
High |
12436259
|
| 2002 |
In S. cerevisiae, simultaneous deletion of WHIP/MGS1 and SGS1 (RecQ helicase) causes elevated G2/M arrest, increased spontaneous sister chromatid recombination, and shortened lifespan. Complementation of the synthetic growth defect requires both the helicase/Top3-binding activity of Sgs1 and the ATPase activity of Mgs1. |
Genetic epistasis (double-deletion analysis, complementation with domain mutants), flow cytometry, SCR measurement in S. cerevisiae |
DNA repair |
High |
12509289
|
| 2006 |
MBP-tagged WRNIP1 directly interacts with WRN in vitro; interaction is enhanced by ATP addition. Walker A motif mutations showed that WRNIP1, but not WRN, must bind ATP for efficient interaction. In DT40 cells, WRNIP1/WRN double knockout showed synergistic increase in camptothecin sensitivity and elevated sister-chromatid exchange compared to single knockouts. |
In vitro pull-down (MBP-tagged proteins), Walker A mutant analysis, DT40 knockout cell lines, camptothecin sensitivity assay, SCE measurement |
DNA repair |
High |
16769258
|
| 2008 |
Human WRNIP1 localizes to DNA replication factories in unperturbed cells and its chromatin association increases upon replication fork stalling (UVC). Localization to subnuclear structures (replication factories and PML bodies) depends on its N-terminal ubiquitin-binding zinc finger (UBZ) domain and C-terminal oligomerization domain. |
Immunofluorescence, chromatin fractionation, live-cell imaging, domain-deletion mutant analysis, co-localization with replication markers |
The Journal of biological chemistry |
High |
18842586
|
| 2008 |
WRNIP1 is polyubiquitinated in vivo with complex chains linked through K11, K48, and K63 of ubiquitin. This polyubiquitination depends on an intact UBZ domain and is enhanced by UV radiation. Sumoylation and phosphorylation are also detected as post-translational modifications. |
Denaturing tandem affinity purification, mass spectrometry, UV treatment, UBZ domain mutant analysis |
Journal of proteome research |
Medium |
18613717
|
| 2009 |
Human WRNIP1 binds forked DNA and template/primer DNA in an ATP-dependent manner. WRNIP1 physically interacts with RAD18 and interferes with RAD18 binding to forked and template/primer DNA. Reciprocally, RAD18 enhances WRNIP1 binding to these DNA substrates. |
DNA-binding assay (forked/template-primer substrates), co-immunoprecipitation, competition binding assay |
Genes & genetic systems |
Medium |
19556710
|
| 2011 |
WRNIP1 accumulates rapidly at laser-irradiated DNA damage sites via its UBZ domain and C-terminal leucine zipper region. The ATPase domain and WRNIP1 ubiquitination (lysine acceptor sites) are dispensable for this recruitment. |
Laser microirradiation, live-cell imaging, domain-deletion and lysine mutant analysis |
Biochemical and biophysical research communications |
Medium |
22209848
|
| 2015 |
WRNIP1 bridges monoubiquitinated PCNA (a stalled replication fork marker) with the ATM cofactor ATMIN, connecting PCNA monoubiquitination to ATM signaling. WRNIP1, ATMIN, and RAD18 are specifically required for ATM activation and 53BP1 focus formation in response to replication stress (but not ionising radiation). |
Co-immunoprecipitation, siRNA knockdown, 53BP1 focus formation assay, ATM signaling assays |
Oncogene |
Medium |
26549024
|
| 2016 |
WRNIP1 localizes to stalled replication forks and cooperates with RAD51 to prevent MRE11-mediated nucleolytic degradation of nascent DNA at stalled forks by stabilizing RAD51 on ssDNA. Fork protection does not require WRNIP1 ATPase activity, but ATPase activity is required for recovery/restart of perturbed replication forks. Loss of WRNIP1 causes DNA damage and chromosomal aberrations; downregulation of anti-recombinase FBH1 rescues fork degradation and aberrations in WRNIP1-deficient cells. |
DNA fiber assay, iPOND, siRNA/shRNA knockdown, ATPase-dead mutant, chromosomal aberration analysis, epistasis with FBH1 knockdown |
The EMBO journal |
High |
27242363
|
| 2016 |
Crystal structure of the WRNIP1 UBZ domain in complex with ubiquitin was determined, revealing a novel ubiquitin-binding surface composed of the first β-strand and the C-terminal α-helix, distinct from the pol η UBZ binding mode. |
X-ray crystallography (GFP-fusion crystallization), structural comparison |
The FEBS journal |
High |
27062441
|
| 2017 |
WRNIP1 (as WHIP) assembles into a mitochondrial signaling complex with TRIM14 and PPP6C. The UBZ (ubiquitin-binding) domain of WRNIP1 bridges RIG-I with MAVS by binding polyubiquitin chains on RIG-I at K164. The ATPase domain of WRNIP1 stabilizes the RIG-I–dsRNA interaction. This WHIP-TRIM14-PPP6C signalosome promotes RIG-I-mediated innate antiviral signaling. |
Pooled RNAi screen, yeast two-hybrid, co-immunoprecipitation, domain mutant analysis, antiviral signaling assays |
Molecular cell |
High |
29053956
|
| 2019 |
WRNIP1 protects the junction point of reversed replication forks from SLX4-mediated endonucleolytic cleavage, functioning downstream of fork reversal. This protective activity is specific to the shorter, less abundant isoform of WRNIP1 and is independent of the BRCA2-dependent fork protection branch. |
DNA fiber assay, siRNA knockdown, epistasis with SLX4/BRCA2 depletion, electron microscopy of replication intermediates |
iScience |
High |
31654852
|
| 2019 |
WRNIP1 and PrimPol form a complex in cells. Overexpression of WRNIP1 reduces PrimPol protein levels via proteasome-dependent degradation, while WRNIP1 depletion increases PrimPol levels. The ATPase domain of WRNIP1 is involved in regulating PrimPol amount. |
Co-immunoprecipitation, overexpression/knockdown, proteasome inhibitor treatment, domain mutant analysis |
Biological & pharmaceutical bulletin |
Medium |
31061318
|
| 2020 |
WRNIP1 is recruited to DNA interstrand crosslinks (ICLs) rapidly after their formation, promoting ICL repair and facilitating subsequent recruitment of the FANCD2/FANCI complex. Ubiquitination of WRNIP1 and integrity of its UBZ domain are required for FANCD2/FANCI chromatin loading and efficient ICL repair. WRNIP1 was identified in a FANCD2-containing protein complex by MS. |
Live-cell imaging, mass spectrometry of FANCD2 complex, siRNA depletion, ICL-drug sensitivity assay, UBZ mutant analysis |
Cell reports |
High |
32640220
|
| 2020 |
In S. cerevisiae, Mgs1/WRNIP1 ATPase activity prevents a recombination salvage pathway at stalled replication forks. In the absence of Rad5 (DDT factor), loss of Mgs1 activates a RAD52/RAD59-dependent recombination bypass pathway that requires pol δ and PCNA-K164 modification and is enabled by Esc2 and Elg1. Mgs1 normally inhibits this pathway to favor Rad5-dependent template switching. |
Genetic epistasis (double/triple mutants in S. cerevisiae), DNA replication assay, viability under replication stress, mutant analysis |
Science advances |
High |
32285001
|
| 2020 |
WRNIP1 is retained on chromatin and required to maintain genome integrity in cells with compromised ATR checkpoint. WRNIP1 mediates ATM-dependent CHK1 phosphorylation. WRNIP1 chromatin retention stabilizes RAD51 association with ssDNA near R-loops, and loss of WRNIP1 increases R-loop-dependent genomic instability. |
Chromatin fractionation, immunofluorescence, siRNA knockdown, ATM/ATR inhibition, R-loop detection (S9.6 antibody), RAD51 ChIP |
Cancers |
Medium |
32046194
|
| 2010 |
WRNIP1/WHIP was found to associate in vivo with the Nup107-160 subcomplex of the nuclear pore complex (NPC), identified by mass spectrometry. Reciprocal immunoprecipitation confirmed WHIP-Nup107 interaction. WHIP localizes to the nuclear rim and nuclear matrix by immunofluorescence. This NPC association is dynamic through the cell cycle and occurs without interaction with WRN. |
Mass spectrometry of isolated Nup107-160 subcomplex, reciprocal co-immunoprecipitation, immunofluorescence, nuclear envelope fractionation, cell synchronization |
Cell cycle |
Medium |
20676042
|
| 2014 |
WRNIP1 functions upstream of DNA polymerase η (Polη) in the UV-induced DNA damage response. Disruption of WRNIP1 in Polη-deficient DT40 cells suppresses Polη-loss phenotypes: UV sensitivity, delayed CPD repair, elevated mutation frequency, elevated UV-induced SCE, and reduced fork progression after UV. This epistasis places WRNIP1 upstream of Polη in translesion synthesis. |
Genetic epistasis (WRNIP1/POLH double-knockout DT40 cells), UV sensitivity assay, CPD repair assay, mutation frequency, SCE assay, DNA fiber assay |
Biochemical and biophysical research communications |
High |
25139235
|
| 2022 |
The UBZ domain of WRNIP1 is responsible for reducing UV-induced PCNA monoubiquitylation in Polη-deficient cells. The ATPase domain regulates PrimPol protein levels. The leucine zipper domain is required for interaction with RAD18 and with DNA pol δ catalytic subunit POLD1. |
Domain-deletion and point mutants of WRNIP1 expressed in DT40 double-knockout cells, PCNA monoubiquitylation assay, co-immunoprecipitation with RAD18 and POLD1, UV sensitivity |
Biological & pharmaceutical bulletin |
Medium |
35110507
|
| 2024 |
WRNIP1 co-localizes with transcription/replication complexes and R-loops upon replication perturbation. Loss of WRNIP1 leads to R-loop accumulation and replication-transcription conflicts. WRNIP1 is required for replication restart from transcription-induced fork stalling. The UBZ domain is critical for preventing pathological R-loop persistence. Transcription inhibition or RNase H1 overexpression rescues defects caused by WRNIP1 loss. |
Immunofluorescence, S9.6 R-loop detection, DNA fiber assay, RNase H1 overexpression rescue, transcription inhibitor rescue, siRNA/shRNA depletion, UBZ mutant analysis |
eLife |
High |
38488661
|
| 2024 |
Nuclear AXL (TAM receptor tyrosine kinase) interacts with WRNIP1 and this interaction promotes protection of stalled replication forks in HER2+ breast cancer cells. Knockdown or inhibition of AXL or WRNIP1 attenuates fork protection. |
Co-immunoprecipitation (nuclear fraction), siRNA knockdown, pharmacological inhibition, DNA fiber assay |
Cancer research |
Medium |
38190717
|
| 2023 |
WRNIP1 is essential for the cellular response to mitochondrial DNA double-strand breaks (mtDSBs). CRISPR screen identified WRNIP1 as specifically essential under mitochondrial (not nuclear) DNA damage. WRNIP1 is implicated in mitochondrial turnover in response to mtDSBs and in innate immune signaling downstream of mtDNA damage. |
CRISPR/Cas9 genome-wide screen with mitochondria-targeted doxorubicin, functional validation by WRNIP1 knockdown/knockout, mitochondrial damage assays |
ACS chemical biology |
Medium |
38054633
|
| 2025 |
WRN and WRNIP1 ATPase activities are required for high-fidelity translesion synthesis (TLS) by Y-family DNA polymerases in human cells. Defects in WRN or WRNIP1 ATPase activity cause diverse nucleotide misincorporations opposite DNA lesions by Y-family Pols, indicating these ATPase activities restrain misincorporations (possibly by tightening the TLS Pol active site), while WRN exonuclease removes misinserted nucleotides. |
In vivo TLS fidelity assays in human cells with ATPase-dead mutants of WRN and WRNIP1, mutation spectrum analysis |
eLife |
Medium |
40900148
|
| 2025 |
WRNIP1 has a novel function in G1-phase DNA double-strand break (DSB) repair, independent of non-homologous end joining (NHEJ). Deletion of WRNIP1 in NHEJ-deficient DT40 cells causes slow growth, G1 accumulation, increased dead cells, and accumulation of γH2AX-marked DSBs. |
Genetic epistasis (WRNIP1/Ku70 double-knockout DT40 cells), flow cytometry (cell cycle), γH2AX immunofluorescence, growth assay |
Biological & pharmaceutical bulletin |
Medium |
40484680
|
| 2006 |
WRNIP1-deficient DT40 cells and RAD18-deficient DT40 cells both show moderate camptothecin sensitivity; double knockout cells show additive/synergistic SCE elevation and slower growth. Unexpectedly, the severe CPT sensitivity of RAD18-deficient cells is slightly suppressed by loss of WRNIP1, suggesting WRNIP1 acts in a pathway parallel to RAD18 in vertebrate cells. |
Genetic epistasis (WRNIP1/RAD18 double-knockout DT40 cells), CPT sensitivity, SCE measurement, growth assay |
Biological & pharmaceutical bulletin |
Medium |
17077513
|
| 2008 |
WRNIP1 and BLM (RecQ helicase) independently suppress sister chromatid exchange in vertebrate cells; WRNIP1/BLM double-knockout DT40 cells show additive SCE elevation and enhanced sensitivity to camptothecin but not MMS, indicating they function in parallel pathways for CPT-induced lesion repair. |
Genetic epistasis (wrnip1/blm double-knockout DT40 cells), SCE measurement, CPT/MMS sensitivity assay |
Genes & genetic systems |
Medium |
18379138
|