What does LIG4 do in response to DNA breaks?
Function. The protein encoded by this gene is an ATP-dependent DNA ligase that joins double-strand breaks during the non-homologous end joining pathway of double-strand break repair.
What is IV syndrome?
LIG4 syndrome (also known as Ligase IV syndrome) is an extremely rare condition caused by mutations in the DNA Ligase IV (LIG4) gene. Some mutations in this gene are associated with a resistance against multiple myeloma and Severe Combined Immunodeficiency.
What does NHEJ stand for?
The subsequent repair of chromosomal DSBs by the cell can be classified into two categories of repair pathways: non-homologous end joining (NHEJ) and homology-directed repair (HDR). At its core, NHEJ-break ends can be ligated without a homologous template, whereas HDR-breaks requires a template to guide repair.
What is the definition of ligase in biology?
ligase. / (ˈlaɪˌɡeɪz) / noun. any of a class of enzymes that catalyse the formation of covalent bonds and are important in the synthesis and repair of biological molecules, such as DNA.
How does T4 ligase work?
T4 DNA Ligase catalyzes the joining of two cohesive- or blunt-ended strands of DNA between the 5´-phosphate and the 3´-hydroxyl groups of adjacent nucleotides. The enzyme will not join single-stranded nucleic acids.
What is Nijmegen breakage syndrome?
Nijmegen breakage syndrome is a condition characterized by short stature, an unusually small head size (microcephaly ), distinctive facial features, recurrent respiratory tract infections, an increased risk of cancer, intellectual disability, and other health problems.
What is the action of ligases?
DNA ligase is a specific type of enzyme, a ligase, (EC 6.5. 1.1) that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond. Purified DNA ligase is used in gene cloning to join DNA molecules together to form recombinant DNA.
Is NHEJ or HDR better?
At its core, NHEJ-break ends can be ligated without a homologous template, whereas HDR-breaks requires a template to guide repair. NHEJ is a very efficient repair mechanism that is most active in the cell. HDR-edited DNA is much more desirable to ensure controlled modifications.
What is the LIG4 gene?
LIG4 (DNA Ligase 4) is a Protein Coding gene. Diseases associated with LIG4 include Lig4 Syndrome and Myeloma, Multiple . Among its related pathways are HIV Life Cycle and Chks in Checkpoint Regulation . Gene Ontology (GO) annotations related to this gene include ligase activity and DNA ligase activity . An important paralog of this gene is LIG3.
What is the binding of LIG4 to the DNA end?
Binding of the LIG4-XRCC4 complex to DNA ends is dependent on the assembly of the DNA-dependent protein kinase complex DNA-PK to these DNA ends (PubMed: 10854421 ). LIG4 regulates nuclear localization of XRCC4 (PubMed: 24984242 ). “DNA ligase IV from HeLa cell nuclei.” Cited for: FUNCTION, SUBCELLULAR LOCATION.
How is the lig4-xrcc4 complex attached to the DNA?
Binding of the LIG4-XRCC4 complex to DNA ends is dependent on the assembly of the DNA-dependent protein kinase complex DNA-PK to these DNA ends (PubMed: 10854421 ). LIG4 regulates nuclear localization of XRCC4 (PubMed: 24984242 ).
What are the MGI mutant phenotypes for LIG4?
MGI mutant phenotypes for LIG4: An abnormality of the integument, which consists of the skin and the superficial fascia. An abnormality of the hair. A noncongenital process of hair loss, which may progress to partial or complete baldness. Abnormality of the nail. Any abnormality of the cardiovascular system.