| 2018 |
POLE3-POLE4 forms a histone H3-H4 chaperone subcomplex of DNA polymerase epsilon that selectively binds histones H3-H4, promotes tetrasome formation and DNA supercoiling in vitro, and in cells binds both newly synthesized and parental histones; its depletion hinders helicase unwinding, chromatin PCNA unloading, and compromises coordinated parental histone retention and new histone deposition at the replication fork. |
Hydrogen/deuterium exchange mass spectrometry, physical domain mapping, in vitro tetrasome formation and DNA supercoiling assays, cellular depletion with chromatin fractionation and PCNA unloading readouts |
Molecular cell |
High |
30217558
|
| 2018 |
POLE4 deficiency in mice destabilizes the entire Polε complex (including POLE3), leading to replication stress and inefficient replication origin firing, attributable to the role of POLE3/POLE4 in promoting Polε processivity; budding yeast orthologs of POLE3/POLE4 promote Polε processivity in vitro but are dispensable for viability in vivo. |
Pole4 knockout mouse model, replication stress markers (p53 activation), origin firing assays, genetic rescue by p53 removal, comparison to yeast in vitro processivity data |
Molecular cell |
High |
29754823
|
| 2004 |
CHRAC-17 (POLE3) heterodimerizes with CHRAC-15 via histone-fold domains; the CHRAC-15/17 dimer directly interacts with ACF1 and facilitates ATP-dependent nucleosome sliding by ACF. CHRAC-15 is essential for interaction with ACF and sliding enhancement. CHRAC-17 also interacts with p12 (POLE4) in DNA polymerase epsilon. Additionally, the CHRAC-15/17 and p12/CHRAC-17 complexes facilitate ACF-mediated chromatin assembly by a mechanism distinct from nucleosome sliding. |
Biochemical reconstitution of nucleosome sliding assays, direct interaction mapping, chromatin assembly assays |
Molecular cell |
High |
14759371
|
| 2010 |
CHRAC17 (POLE3) is a component of the CHRAC complex (ACF1-SNF2H-CHRAC15-CHRAC17) that becomes more associated with chromatin after DSBs; the CHRAC complex is required for both NHEJ and HR repair of DSBs in human cells, acting downstream of KU70/80 recruitment. |
Co-IP/co-immunoprecipitation showing increased CHRAC complex-chromatin association after DSBs, siRNA knockdown with DSB repair frequency assays (NHEJ and HR reporters), X-ray sensitivity assays |
Molecular cell |
High |
21172662
|
| 2008 |
POLE3 (CHRAC17) and POLE4 are components of human ATAC-type complexes containing GCN5/PCAF acetyltransferases, linking chromatin assembly/remodeling and DNA replication machineries to histone acetylation and transcriptional regulation. |
Biochemical purification and characterization of human ATAC complex; mass spectrometry identification of components |
The Journal of biological chemistry |
Medium |
18838386
|
| 2021 |
Budding yeast Dpb4 (ortholog of POLE3/CHRAC17) acts in two distinct protein complexes at DNA double-strand breaks: (1) interacting with Dls1 in the ISW2 complex to facilitate Isw2 ATPase association and promote histone removal/DSB resection; and (2) interacting with Dpb3 in the Pol ε complex to facilitate Rad9 checkpoint protein association at DSBs and promote checkpoint activation. A Dpb4 A62S histone fold domain mutation enhances these activities. |
Genetic epistasis, chromatin immunoprecipitation, double mutant analysis in S. cerevisiae, checkpoint activation assays, DSB resection assays |
Nature communications |
High |
34362907
|
| 2023 |
POLE3-POLE4 interact with the HUSH complex (MPP8 and TASOR) via the leading-strand polymerase Pol ε and contribute to asymmetric segregation of H3K9me3 preferentially onto leading strands at LINE retrotransposons; cells deficient in POLE3 and POLE4 show compromised H3K9me3 asymmetry and increased LINE expression. |
Co-immunoprecipitation, POLE3/POLE4 knockout cells, ChIP-seq/strand-specific H3K9me3 analysis, MPP8 mutant defective in H3K9me3 binding, TASOR mutants with reduced Pol ε interaction |
Nature |
High |
37938774
|
| 2022 |
Pole3 (together with Mcm2 and Pole4) mediates transfer of both parental H3.1 and H3.3 histones following DNA replication; Mcm2, Pole3, and Pole4 mutants defective in parental histone transfer show defects in chromosome segregation. |
SNAP-tag pulse-chase for parental histone tracking, mutant cell lines, chromosome segregation assays |
Nature communications |
High |
35523900
|
| 2023 |
Pole3 deletion in mouse embryonic stem cells causes aberrant histone landscapes (altered H3.3 and H3K27me3 patterning at differentiation gene regulatory sites) and impaired neural differentiation, demonstrating that symmetric parental histone deposition mediated by Pole3 is required for faithful epigenetic inheritance and developmental gene regulation. |
Pole3 knockout ESCs, ChIP-seq for H3.3 and H3K27me3, neural differentiation assays, comparison with Mcm2 histone-binding mutants |
Nature genetics |
High |
37666989
|
| 2023 |
POLE3 interacts with CHRAC1 (CHRAC15) to promote DNA double-strand break repair by regulating expression of homology-directed repair proteins and KU80 recruitment; a CHRAC1 D121Y cancer mutation attenuates the POLE3-CHRAC1 interaction and impairs DNA repair. |
Co-immunoprecipitation, siRNA knockdown, KU80 recruitment assays, HDR protein expression analysis, cancer mutation analysis |
Science advances |
Medium |
37682991
|
| 2023 |
POLE3 maintains unintegrated HIV-1 DNA in a repressive chromatin state by preventing RNAPII recruitment to the viral promoter. Loss of POLE3 reduces HIV-1 integration efficiency and impairs viral replication, revealing POLE3 as a repressor of unintegrated retroviral DNA. |
siRNA knockdown and CRISPR knockout of POLE3, chromatin immunoprecipitation for RNAPII, HIV-1 integration efficiency assays, innate immune sensing assays in primary CD4+ T cells |
Science advances |
Medium |
37922361
|
| 2020 |
The histone fold domain of POLE3 has a stage-specific function during T and B cell development; mice with viable hypomorphic and neomorphic Pole3 alleles display tissue-restricted lymphocyte developmental defects. Progressive introduction of positively charged residues into the acidic C terminus causes peripheral lymphopenia of increasing severity, indicating the acidic C terminus is functionally important for lymphocyte homeostasis. |
Pole3 knockout and hypomorphic/neomorphic allele mice, flow cytometry of lymphocyte populations, genetic allelic series with targeted C-terminal charge mutations |
Cell reports |
Medium |
32553171
|
| 2024 |
Loss of POLE3-POLE4 sensitizes cancer cells to PARP inhibitors in a manner independent of homologous recombination deficiency; PARPi treatment triggers replicative gap accumulation in POLE3-POLE4 KO cells in a PRIMPOL-dependent manner. Knockdown of 53BP1 does not rescue PARPi sensitivity in POLE3-POLE4 KO cells, distinguishing this mechanism from common PARPi resistance pathways. |
CRISPR knockout of POLE3-POLE4, RAD51 foci formation assays, ssDNA gap accumulation assays, PRIMPOL dependency experiments, 53BP1 knockdown epistasis, BRCA1-silenced cell combination studies |
Cell reports |
High |
38753485
|
| 2024 |
Loss of POLE4 (and POLE3) sensitizes cells to PARP inhibitors via impaired post-replicative repair leading to single-stranded DNA gap accumulation behind replication forks, with elevated ATR and DNA-PK replication stress signaling; this mechanism acts in parallel to BRCA1 and can counteract acquired PARPi resistance. |
POLE4 knockout cells, DNA fiber assays (replication speed), ssDNA gap detection, ATR/DNA-PK phosphorylation readouts, BRCA1 epistasis experiments, PARPi sensitivity assays |
Nucleic acids research |
High |
38828775
|
| 2025 |
POLE3-POLE4 'grips' newly synthesized dsDNA at the replication fork to promote Polε processivity on the leading strand; this function is distinct from and works in parallel with leading strand-specific PCNA loading by CHTF18-RFC2/5. Combined loss of POLE3-POLE4 and CHTF18-RFC2/5 is synthetically lethal and incompatible with leading strand synthesis. Iron metabolism genes are required to sustain Iron-Sulphur Cluster-dependent Polε activity. |
CRISPR genetic screens in POLE4-deficient cells, structural modelling, biochemistry, cell biology assays for leading strand synthesis and PCNA loading |
Nature communications |
High |
41339636
|
| 2000 |
YBL1 (POLE3) belongs to the H2A-H2B sub-family of histone fold proteins related to NF-YB and NC2; it forms complexes with histones in solution and on DNA in nucleosome reconstitution assays, and is part of relatively large complexes by glycerol gradient sedimentation, but lacks intrinsic CCAAT- or TATA-binding capacity. |
Nucleosome reconstitution assays, glycerol gradient sedimentation, DNA binding assays |
Nucleic acids research |
Medium |
11000277
|
| 2006 |
The Pole3 promoter is bidirectional, lacks CCAAT and TATA boxes, and is regulated in a cell-cycle-dependent manner (peaking at S phase entry). E2F1/4 and MYC bind the Pole3 promoter in a phase-specific manner as shown by chromatin immunoprecipitation; an E-box and neighbouring direct repeat are important for regulation. |
Promoter mutagenesis, stable reporter clones, chromatin immunoprecipitation for E2F1/4 and MYC |
Gene |
Medium |
16403426
|
| 2026 |
USP15 binds POLE3 (confirmed by Co-IP) and suppresses its ubiquitination-dependent degradation, thereby stabilizing POLE3 and facilitating DNA damage repair and cisplatin resistance in pancreatic cancer cells. |
Co-immunoprecipitation, ubiquitination assays, loss-of-function and gain-of-function studies, xenograft model, neutral comet assays |
Molecular carcinogenesis |
Medium |
41950365
|
| 2025 |
POLE3 is covalently modified at Cys51 by alkaloidal Michael acceptor compound 15, and this covalent targeting of POLE3 identified via competitive pull-down and mass spectrometry contributes to anti-HBV activity (reducing cccDNA and rcDNA levels). |
Competitive pull-down with biotin/fluorescent-tagged probe, mass spectrometry identification of Cys51 modification, POLE3 knockdown functional validation |
RSC chemical biology |
Medium |
41164343
|
| 2022 |
DSCC1 and POLE3 show a synthetic lethal interaction; co-depletion of DSCC1 and POLE3 (both interacting with the catalytic Polε subunit) additively impairs DNA replication, suggesting DSCC1-RFC and POLE3 contribute to leading-strand DNA replication in parallel pathways. |
Genome-wide CRISPR screens in DSCC1-KO cells, co-depletion replication assays, DNA fiber analysis |
Life science alliance |
Medium |
36622344
|