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DNA ligase IV (LIG4) is not essential for telomere joining.
We demonstrated an association between six previously published single nucleotide polymorphisms (rs15869 [ BRCA2 (zeige BRCA2 ELISA Kits)], rs1805389 [ LIG4], rs8079544 [ TP53 (zeige TP53 ELISA Kits)], rs25489 [ XRCC1 (zeige XRCC1 ELISA Kits)], rs1673041 [ POLD1 (zeige POLD1 ELISA Kits)], and rs11615 [ ERCC1 (zeige ERCC1 ELISA Kits)]) and subsequent CNS tumors in survivors of childhood cancer treated by radiation therapy.
In a recombinant PNKP (zeige PNKP ELISA Kits)-XRCC4 (zeige XRCC4 ELISA Kits)-LigIV complex, both the PNKP (zeige PNKP ELISA Kits) FHA (zeige CRY2 ELISA Kits) and catalytic domains contact the XRCC4 (zeige XRCC4 ELISA Kits) coiled-coil and LigIV BRCT repeats. Multipoint contacts between PNKP (zeige PNKP ELISA Kits) and XRCC4 (zeige XRCC4 ELISA Kits)-LigIV regulate PNKP (zeige PNKP ELISA Kits) recruitment and activity within NHEJ.
Data suggest that stimulation of Artemis nuclease/DCLRE1C (zeige DCLRE1C ELISA Kits) activity by XRCC4 (zeige XRCC4 ELISA Kits)-DNA ligase IV hetero-complex and efficiency of blunt-end ligation are determined by structural configurations at the DNA ends. (XRCC4 (zeige XRCC4 ELISA Kits) = X-ray repair cross complementing 4)
found that the rs228593, rs2267437 and rs1805388 functional polymorphisms probably alter the level of expression of the ATM (zeige ATM ELISA Kits), XRCC6 (zeige XRCC6 ELISA Kits) and LIG4 genes, respectively, being important in the maintenance of genomic instability in MDS (zeige PAFAH1B1 ELISA Kits)
marked overlap of dyskeratosis congenita with four other genetic syndromes, confounding accurate diagnosis and subsequent management. Patients with clinical features of dyskeratosis congenita need to have genetic analysis of USB1, LIG4 and GRHL2 (zeige GRHL2 ELISA Kits) in addition to the classical dyskeratosis congenita genes and telomere length measurements.
The rs1805388 in LIG4 was associated with increased radioresistance.
LIG4 is highly upregulated in human colorectal cancer cells.
Five novel mutations in LIG4 and a potential hotspot mutation (c.833G > T; p.R278L) in the Chinese population with LIG4 deficiency syndrome were identified.
Our study identifies LIG4 as a predictor of an increased risk for early biochemical recurrence in prostate cancer
The genetic polymorphisms in LIG4 rs1805388 and HSPB1 (zeige HSPB1 ELISA Kits) rs2868371 were not obviously correlated with the risk of radiation pneumonitis and radiation-induced lung injury of lung cancer.
The data firmly demonstrate Lig4(R278H) activity renders nonhomologous end-joining (NHEJ) DNA repair to be more error-prone, and predict increased error-prone NHEJ and A-EJ suppression as the cause of defective B lymphopoiesis in Lig4 patients.
To promote homology-directed r at the expense of nonhomologous end joining , we targeted DNA ligase IV, a key enzyme in the NHEJ pathway, using the inhibitor Scr7. This approach should be applicable to other customizable endonucleases
Lig4 and XRCC1 (zeige XRCC1 ELISA Kits) double-deficient cells switch as efficiently as Lig4-deficient cells, clearly indicating that XRCC1 (zeige XRCC1 ELISA Kits) is dispensable for A-EJ in CH12F3 cells during class switch recombination
These studies provide insight into the interplay between DNA damage responses in the developing brain and the DNA ligase IV plat (zeige PLAT ELISA Kits) the role in repairing endogenously arising DNA double-strand breaks.
Lig4-deficient B cells have reduced, but still substantial, immunoglobulins class switch recombination
Homozygous DNA ligase IV R278H mutation in mice leads to leaky SCID (zeige PRKDC ELISA Kits) and represents a model for human LIG4 syndrome.
Lig4 and Rad54 (zeige RAD54L ELISA Kits) cooperate to support cellular proliferation, dna repair, and prevent chromosome and single chromatid aberrations
LIG4 mutations can result in either a developmental defect with immunological abnormalities or a severe combined immunodeficiency (zeige PRKDC ELISA Kits) picture with normal development.
DNA Ligase IV is engaged in extrachromosomal circular major satellite DNA synthesis
DNA-PK kinase activity results in disassembly of the Ku/DNA ligase IV/Xrcc4 (zeige XRCC4 ELISA Kits) complex
The protein encoded by this gene is a DNA ligase that joins single-strand breaks in a double-stranded polydeoxynucleotide in an ATP-dependent reaction. This protein is essential for V(D)J recombination and DNA double-strand break (DSB) repair through nonhomologous end joining (NHEJ). This protein forms a complex with the X-ray repair cross complementing protein 4 (XRCC4), and further interacts with the DNA-dependent protein kinase (DNA-PK). Both XRCC4 and DNA-PK are known to be required for NHEJ. The crystal structure of the complex formed by this protein and XRCC4 has been resolved. Defects in this gene are the cause of LIG4 syndrome. Alternatively spliced transcript variants encoding the same protein have been observed.
DNA ligase 4
, ligase IV, DNA, ATP-dependent
, DNA ligase IV
, DNA ligase (ATP) 4
, ligase4-like protein
, DNA ligase 4-like
, dsDNA break repair ligase
, polydeoxyribonucleotide synthase [ATP] 4
, DNA joinase
, DNA repair enzyme
, polynucleotide ligase