There is a hereditary disease of many people associated with the cellular response to a defective DNA damage. (In the example, including xeroderma pigmentosum, a trichothiodystrophy and Cockayne syndrome), response flawed basic NER (Nijmegen breakage syndrome and ataxia telangiectasia) helicase DNA strand break repair defect (colon, including the hereditary non-polyposis cancer) (Bloom, Rothmund-Thomson syndrome and Werner) mismatch repair, chromosome stability and (Fanconi anemia) class switch recombination (hyper IGM syndrome). Cancer susceptibility is a common theme among people with DNA repair gene mutations. Bound DNA damage and defects in DNA repair, can lead to tumor formation inevitable and genomic instability. The syndrome chromosome recessive familial cancer, such as xeroderma pigmentosum ataxia telangiectasia like this, Bloom syndrome, Fanconi anemia, Rothmund-Thomson, and Werner’s syndrome is likely to occur, defects in DNA repair in genomic instability It is an example of how that can lead.

Genetic disease caused by mutations in the gene BER pathway is less common than those caused other genes, by DNA repair pathway. Interestingly, however, in about half in response to a change in one amino acid 30% of all human tumors, I examined the protein POLβ embodiment. May have a mutation in the gene phenotypes family-like familial adenomatous polyposis, which encodes the human homolog of MutY has been shown, Cancer 2002 links, and between the defects is BER inherited the initial It is reported in the year. It decreased ability to initiate the repair of ,8-oxoG • mismatch that led mutations lead to inactivation of the protein adenomatous polyposis car probably, to increase the transformer version number of adenomatous polyposis gene car the GT MutY homolog discovery turned out to cause.

Recessive mutation of UNG is one of the reasons for the Hyper-IGM syndrome of primary immunodeficiency disease found it in three patients. The route is initiated by activation-induced cytidine deaminase, UNG is required to cause class switching antibody genes involved in the formation of high affinity antibodies and somatic recombination mutations. In these patients, recessive mutations have been found in the catalytic domain, which is shared by nuclear and mitochondrial isoforms of UNG. That B cells from patients with these severe, to impair the class switch recombination step precleavage DNA in patterns of somatic hypermutation is abnormal was found. 28% of the elderly (> 18 months), and UNG knockout mice developed a lymphoma compared with only 1.3% of the control animals, still, these patients do not progress to cancer.

Lymphoma, different mutations miscoding two LIG1 allele individual growth retardation, sun sensitivity, and was discovered in immunodeficiency (165) patients. Defect retardation connection Okazaki fragments lagging strand DNA synthesis represents an index, the patient-derived fibroblast cell line, increased sensitivity to DNA damaging agents in several ways.

Further mutation of the gene for DNA repair, it is associated with a neurodegenerative disease. As an example, Werner’s syndrome (WS) is included with (B and CSA) ataxia telangiectasia (ATM), xeroderma pigmentosum (XPA-G), Cockayne syndrome. In addition, as part of the syndrome, trichothiodystrophy, Rothmund-Thomson syndrome and Bloom syndrome, have mental retardation. This is believed to be capable of neurons in Alzheimer’s disease patients have a genetic defect in BER. In fact, 8 – increases the level of mitochondrial deletions and oxoG, lack BER has been found in patients with Alzheimer’s disease. Level of metabolism of the nerve cells is high, it may be the BER, compared to other types of cells (such as mitochondria and nuclei) repair of DNA damage in nerve cells plays a more important role has been proposed . Oxidative stress plays an important role in neuronal cell death associated with neurodegenerative diseases in various ways. Elevated levels of oxidative damage is observed in chronic active plaque of patients with multiple sclerosis and dementia and related area, of the brain with Lewy bodies of the cortex. In addition, isoforms of OGG1 mitochondria increases in substantia nigra and activity APE1 expression and patients with Parkinson’s disease has declined amyotrophic lateral sclerosis (ALS), in sporadic ALS patients. APE1 missense mutations sporadic, were found in 8 out of 11 cases of familial ALS patients. However, one report indicates that APE1 has increased in ALS patients.

In mammals, there are certain types of four ligase. DNA ligase I is: ligation the DNA of the lagging nascent chains after being pulled from the primer RNA Okazaki fragments ribonuclease H. It helps to seal the DNA complex with the DNA repair protein XRCC1, in the course of a recombinant fragment and nucleotide excision repair: DNA ligase III. Complex and XRCC4: DNA ligase IV. Join the DNA double strand break repair pathway, which catalyzes the last step of the non-homologous end. Further, it is necessary to produce the various processes of the T cell receptor loci and immunoglobulin during the development V (D) J recombination immune system.
To create a phosphodiester bond, DNA ligase in E. coli, using the energy cut nicotinamide adenine dinucleotide (NAD) origin. Instead of adenosine triphosphate (ATP), eukaryotic microbes and other DNA ligase is using the NAD. Further, because they create intermediate enzymes, various structures of the other present in the DNA ligase is a lysine and AMP which is important for the consolidation.

DNA ligase, has become an essential tool in the study of modern molecular biology for the production of recombinant DNA sequences. For example, often, DNA ligase, used with restriction enzymes to insert a DNA fragment into the gene of the plasmid.
Management optimum temperature is an important aspect for implementing the recombination experiments effective, including binding fragments single type. Most experiments that (separation from T4 bacteriophage) T4 DNA ligase is most active at 25 ℃, to use however, for optimum efficiency, optimum of the enzyme type of single ligation fragment in (“sticky ends”) (annealing temperature) and melting temperature Tm of the sticky ends that you need to balance between the right temperature degree is joined. Tm above the ambient temperature of the homologous binding sticky end because the distorted hydrogen bonds high temperature is not stable. The ligation reaction at the end of curing, sticky is the most effective if already well – the destruction of the firing of all, therefore, would result in lower ligation efficiency. Short overhangs, low CT. In general, four-base overhang is Tm ℃ 12-16

Since blunt end DNA fragments anneal to sticky ends, melting temperature is not a factor in the normal temperature of the ligation reaction. However, the possibility of higher temperature, edge joining lower would be brought in order to allow the connection (moving more in solution at higher temperatures molecule). Instead of ligase activity, limiting factor blunt end ligation, the number of paths across the DNA fragments generated. Therefore, it temperatures most efficient for the ligation of blunt-ended DNA becomes a temperature that may cause multiple paths occurs. Most of the blunt-end ligation is carried out overnight at 14 ~ 20 ℃. Lack of end annealed stable means that the ligation efficiency and need to use higher concentrations ligase is reduced. (T4 DNA ligase, DNA ligase is a commercially available only annealing the blunt end).

DNA ligase, E. coli, is a polypeptide of 75,000 molecular weight. It is slightly smaller (68 000-63 000) in T4-induced enzyme comparable. DPN (E. coli), or both enzymes, phospho between the 3′-hydroxyl group and the 5 ‘phosphoryl adjacent to the double-stranded DNA was nicked coupled to the cleavage of the pyrophosphate bond of ATP (T4) I catalyzes the synthesis of bonds. Phosphodiester bond synthesis, requires the participation of two covalent intermediate and is catalyzed by two enzymes steps series of these individual. The steady-state kinetic analysis of the reaction catalyst E. coli ligase, and supports this mechanism to be important intermediates kinetically for DNA-adenylate and enzyme adenylate, synthetic shortcuts phosphodiester bond It further shows.

Strains of mutation of a structural gene E. coli, the DNA ligase is non-viable at 42 ℃ result of the synthesis of abnormal heat-labile enzyme. It can not grow at 30 ℃, but for their ability to repair DNA damage caused by alkylating agents and ultraviolet light still, there is a defect in the temperature variant. At 42 ℃, “fragment Okazaki” in the form of 10S DNA that has been replicated new is short, keep the ligation process that the cause of the failure of the mutants to survive under these conditions can disrupt the synthesis is essential EF chromosome means that it is that it can not be. DNA ligase is an enzyme essential for normal replication and DNA repair in Escherichia coli. DNA ligase is purified proves reagents useful in the construction of the in vitro recombinant DNA molecule.

It was identified by dual quality DNA is first “issued by” (referred to as name thread flap endonuclease 5 therefore “5 single-stranded flap)” In endonuclease activity of wetlands. Wetland catalyzes the hydrolysis of phosphodiester bonds at the junction of single-and double-stranded DNA. It is possible to function O to the end of the flap chain Swamp also ‘steal’ as the 5 ‘exonuclease’ DNA substrate 5′-3. Based on X-ray crystallographic data, model protein structure. Leaves end indicate that it is arched flexible created by two α-helices by through “the loop threads in the lagoon 5 ‘valve body 5 can be It has been used in the field of biotechnology, for example, single nucleotide polymorphisms Invader and TaqMan PCR assay nuclease, (SNP) analysis.

I have considered repair certain types of DNA double-strand breaks and to proceed through DNA flap, the intermediate structure. DNA flap is a forked structure consisting of the displacement of one strand and double-stranded DNA. To identify the DNA flap cleavage activity of the nuclear extracts of mammalian and established an assay using synthetic substrates, the DNA flap. In this study, it is right in the first purification DNA structure-specific nuclease of mammals. Are described herein, the flap endonuclease 1 (FEN-1), the DNA sequence, enzyme, Tan cut a flap, having the 5 ‘single-stranded end. Expected to enzyme that functions in double-strand break repair valve as resolution, FEN-1 cleavage a flap chain specific, I depend on the chain length of the flap. In addition, all the valve body is required for cleavage of valve effective. The lack substrate in one direction, it is torn from the fan 1. In addition, the branch structure of the others, including the Holiday junction, it is not cleaved by FEN-1. In addition to endonuclease activity, the fan 1 has a 5′-3 ‘exonuclease activity specific for double-stranded DNA. End of the fan 1 – exonuclease activity and are described in the context of the repair DNA replication and recombination.

Such as 1993 Lyamichev. The ability of the DNA polymerase of single-stranded DNA with a base sequence which can not be cleaved recognize how the structure is specific is described. Based on the bifurcated structure formed solely 5 ‘exonuclease activity to remove excess nucleotides in the DNA during replication is not based on any sequence motifs. The (isolated FEN from fulgidus and archeae Pyrococcus Julio) as shown in the wing of the heat-resistant endonuclease, in addition to shows similar characteristics, and the detailed analysis, the structure of the specific cleavage mismatch array such as Lyamichev then Because it showed that to be very sensitive, polymorphism DNA that enables the use of endonuclease activity for high sensitivity detection. In this preliminary study, these enzymes, suggesting that without the need for genotyping reaction or PCR thermal cycling may be used in particular to interrogate the SNP.

We describe the different approaches to the invader ® assay based on the application and its current SNP genotyping in detail below. In addition, we can discuss the new platforms that take advantage of analysis Invaders ®, to provide alternative approaches to trade the available analysis format currently.

Format described allows the genotyping of the SNP very specific, but this requires a significant amount of target molecules to generate a detectable fluorescent signal within a reasonable time. Therefore, this assay format can be Invader reaction, requiring the first PCR amplification of the target region. Furthermore, each of which must be labeled with a quencher molecule and a fluorophore, assays are required (one for each of the SNP alleles) allele-specific probes with two different. This increases the cost of research, suitable for this format for high-throughput genotyping projects and fairly large.

Invader ® assay using flap endonuclease a specific structure (FEN) a three-dimensional complex formed by hybridization of the allele-specific overlapping oligonucleotides to target DNA containing (SNP) site single nucleotide polymorphism to be cut and. In addition to the results of the target molecules in the cleavage of oligonucleotide cleavase, heat resistance by FEN, annealing of oligonucleotide SNP allele. Cleavage can be detected by several different approaches. Most commonly, cleavage product to produce a secondary cleavage reaction on (FRET) cassette fluorescence resonance energy transfer that emits fluorescence signal. Alternatively, cutting may be by the use of fluorescence polarization (FP) probes, or directly detected by mass spectrometry. Invasive cleavage reaction is highly specific, it is possible to have a low error rate, and detects the amount of target zeptomol DNA. Tests have been used to examine the one SNP in one sample per reaction traditionally, the strip efficient and accurate this fits genotyping high-throughput SNP and multiplexing chip or new approach It has been tested in order to perform the assay.

A main catalyst human polymerase patch BER Pol · β is short, to be able to compensate for its absence Pol λ. These polymerases is a member of the Pol X family, I insert a single nucleotide usually. In addition to the polymerase activity, these enzymes have a removal lyase domain disadvantages of AP endonuclease cleavage 5 “DRP, by patch BER continuous, DNA synthesis by Pol and δ por ε processing power PCNA index polymerases polymerase. these those for performing DNA replication are thought to be brought to, means that in order to form a flap (shown above), it is the “shift” after the 5 ‘end of the DNA Thus, you can. Pol β has been conducted, the displacement synthesis to perform long patch, displacement synthesis, route BER. long patch synthesis of both can not join to insert a new nucleotide usually 2-10 .

Synthesized DNA molecules from the nucleotide components, DNA polymerase, a viral polymerase enzymes or cells. Is essential for replication of DNA, usually, DNA polymerase, operates a pair of copies of double-stranded DNA molecule of double-stranded DNA of the two in a process called semi-conservative DNA replication. I have an important role in DNA polymerase, and DNA repair through a special DNA polymerase, recombination, generation of diversity of antibodies and reverse transcription, in other processes in the cell that contains the terminal deoxynucleotidyl transferase. DNA polymerases are widely used, especially for molecular cloning polymerase chain reaction (PCR), DNA, and it is used in molecular biology laboratories.

Regardless DNA polymerase known in the domain structure of their total catalytic subunit has a structure that is highly conserved to mean different things very little species from the seed. Form, can be described as similar to the right hand thumb, and palm and finger domains. Palm domain appears to function in catalyzing the transfer of a phosphate group in the phosphoryl transfer reaction. palm DNA enzyme is active. I believed that this reaction to be catalyzed by metal ions two mechanisms. Finger domain functionality, coupling the nucleotide triphosphate to template-based. Thumb domain plays a potential role positioning and movement of DNA, of processing power. Structure conservative, exert important maintenance to provide cells, the evolutionary advantage in general, the essential functions.

The DNA polymerase of rapid catalyst for processive nature. Capacity is characteristic of an enzyme acting on the polymer surface. In the case of DNA polymerase, the degree of processing power, added to each enzyme, which means the average number of nucleotides to bind to the template. DNA polymerase An average requires about one second to find the primer / template junction, to be connected. It is bound once, is added nucleotides at a rate of nucleotides per second nonprocessive DNA polymerase Hatsu. However, 207-208 processor DNA polymerase adds nucleotides of several two-dramatic increase in the rate of DNA synthesis. The degree of processing power is directly proportional to the rate of DNA synthesis.
Ability of DNA polymerase to slide to the DNA template allows the processing power increased. There is a dramatic increase in processing power of the replication fork. This increase is facilitated by the binding of DNA polymerase and a protein known as a sliding clamp DNA. Is a subunit protein of several related to the shape of the clamp ring. Using the hydrolysis of ATP, the class of proteins known as the sliding stress proteins slide clamp ring-opening structure of the bracket, and the coupling to the release of the DNA strand and / or DNA. By Make sure that the enzyme is bound to the same primer / template junction and continue replication, DNA polymerase clamp protein-protein interactions can be used to prevent the spread of DNA matrix. In order to allow the release of the clamp when it is connected to the completion of the replication region of decreased DNA affinity with it, :207-208 DNA polymerase conformational change increases the affinity of the clamp.

It, AP to be able to respond selectively to objects, APE1, contains the amino acid residues of some. Positive residues Spread the minor groove and (Lys78 and Arg73, Ala74) residues and phosphate of DNA three consecutive coast to include an AP site while Gly127 span and three APE1 Tyr128, was found in four lines phosphate group of negative present in the phosphodiester backbone of the DNA and mounting of extreme refractive DNA caused by the interaction between the α-helix.

Work unfounded this extreme destructive power of DNA into the active site of APE1. Leu282 and Phe266, Trp280, this active site are adjacent to each other are packed tightly in the hydrophobic part of discrimination against sites that have site AP, based. The AP sites its partners orphan base is stabilized by hydrogen bonds with Met270, then, Asn174, Asn212, His309, and are stabilized by hydrogen bonds with phosphate groups of 5 to AP sites and ions Mg 2 . It is stabilized by hydrogen bonding phosphate groups AP sites, and 3 ‘Arg177. On the other hand, the maximum pH was observed in 7.5 APE1 probably the phosphodiester backbone to cut and attack caused by a stabilization in the active site that is made more reactive increase in (log acid dissociation constant or negative) pKa of course to Asp210 by hydrogen bond activation of nucleophilic Asn212 between Asn68 that is due to activities.

APE1 enzyme creates a participant phosphodiester backbone (unfounded) abasic site through Ashirushifuto of a simple mechanism. First, Asp210 residue in the active site, deprotonated molecules of water can make a nucleophilic attack on the phosphate group is located in the 5 ‘site AP. Then, the electrons are stabilized from one of the oxygen atoms of a phosphate group, both kicking oxygen with each other to create a free 5 ‘phosphate group without 3’-OH of the normal nucleotide and AP sites Mg2 ion for moving downward.

Inhibitor known APE1 7 – contains the lucanthone carboxylic acid (CA) – -2 nitro-indole. I have a ring associated with the short-circuit appears as phosphate bond in the DNA and deoxyribose sugar ring without basic application of both the structure of these. Both of these, H-bond acceptor many may be reacted These inhibitors are attached to the active site, thereby blocking the action of enzymes that catalyze other reactions, and H bond donor in the active center of APE1 I contains the body.

It therefore plays an important role in nucleotide excision repair pathway DNA, APE1 has become the subject of research for obtaining funds for preventing surviving cancer cells to chemotherapy. You can enzyme to recognize the AP-site involvement after road BER, it also, to have a redox function which helps to activate other enzymes, itself participated in the backbone of DNA APE1 need Involved in DNA repair as well as to create a user. As APE1 of subversion like this, and prevent cancer cells from the persistent after chemotherapy by it, can cause the sensitivity of tumor cells.

DNA glycosylases has  two classes of mainly the glycosylase: bifunctional and monofunctional. Without the need for AP endonuclease In addition bifunctional glycosylase, creates a strand scission, while having AP lyase activity can reduce the phosphodiester bond of the DNA, monofunctional glycosylase, a sole glycosylase activity they have. The site of the AP lyase glycosylase β-elimination, can be obtained β-unsaturated aldehyde ‘, phosphoric acid product different AP endonuclease cleavage, in the vicinity of 3 ‘5 α. Some glycosylase – lyase 3 ‘3 further – can be run in a phosphate “turning the aldehyde the δ-elimination.

Crystal structure of the first DNA glycosylase was prepared in E. coli second. This structure revealed that the turning base damaged from the double helix at the active site pocket for the enzyme obligations. Other glycosylase been found to follow the same general paradigm, including the following human UNG image later. The cleavage of N-glycosidic bond, monofunctional glycosylase is using one molecule activated carbon water to attack the substrate. Instead, using the amine residue as a nucleophile to attack the same carbon, functional glycosylase, through the Schiff base intermediate.

In molecular biology, uracil DNA glycosylase (UDG), a family of proteins, an enzyme that returns a mutation in DNA. Common mutations most deamination of cytosine to uracil. UDG will repair these mutations. UDG is important for DNA repair, but these mutations do not can cause cancer. DNA glycosylase a T / U mismatch-specific single-stranded selective monofunctional uracil DNA glycosylase and (Mug) (SMUG1: This location DNA glycosylase and associated DNA glycosylase of uracil different uracil DNA glycosylase and (EC), febrile uracil DNA represents glycosylase, the G). By spontaneous deamination of cytosine, DNA is, remove the uracil glycosylase uracil from DNA may or caused by any of the incorporation of Miss Du against DA in DNA replication at the time. Prototype member of this family is the Escherichia coli UDG, which is one of the glycosylase found in first. Have been identified in mammalian cells, including MBD4 and, SMUG1, TDG UNG uracil DNA glycosylase activity four different. They, subcellular localization and substrate specificity is different. In addition, single-stranded DNA is preferably as SMUG1 board, I removed the U of double-stranded DNA.

In addition to the unmodified uracil, SMUG1 consumption tax 5 hydroxyuracil, 5 – can be 5 formyluracil bearing that oxidation of the group ring and C5 hydroxymethyluracil. MBD4 and TDG is a specific strictly for double-stranded DNA. Derivative of U and carbon 5 presented for TDG remove thymine glycol, of guanine, has been modified. The data, in human cells, the SMUG1 and TDG, indicates that it is an enzyme the main responsible for the repair of U: uracil caused to DNA by G miss DOO uptake whereas deals with UNG primarily mispairs caused by cytosine deamination spontaneous. I is considered MBD4 be correct T: G mismatches arising from deamination of methyl cytosine – thymine, 5 CpG sites. The MBD4 mutant mice do not show reduced pressure or survival increased cancer susceptibility not develop properly. However, they obtain a plurality of mutations at CpG sequences of the CT in the small intestine epithelial cells. Structure of the human UNG as a glycosylase other, it was apparent to switch to a base target of the double helix at the active site pocket, that complexes with DNA. UDG undergoes a conformational change from the closed” that is not””” open link in a state bound to DNA.

Usually, various glycosylases has evolved to recognize the base is oxidized formed by reactive oxygen species generated during metabolism of the cells. Lesions most commonly formed on guanine residues, 2,6 – a oxoguanine – diamino – 4 – hydroxy – 5 – 8 formamide (FapyG). The G to T transversion, as a result, ,8-oxoG is mutagenic highly because of the pairing and wrong adenine during replication. HOGG1 the helix hairpin repair of this lesion is initiated by a pair recognize functional DNA glycosylase OGG1, and 8 oxoG C. – is a bifunctional glycosylase belonging to the helix (IUU) family. If you want to recognize the adenine, I found that mispaired consumption tax but ,8-oxoG left as 8 oxoG. The OGG1 knockout mice, which showed an increase in the incidence of tumors, as they age, did not accumulate 8-oxoG in the liver. Invalidation is found at the same time as was observed in the loss of phenotype found similar to [23], then why OGG1 8-oxoG accumulation in various tissues, including the small intestine and lung in case. [24], mutant has been found that if they are associated with an increased risk of colon cancer and colon polyps in humans. In addition to OGG1, when NEIL3 DNA glycosylase three additional and NEIL1, NEIL2 is included, human cells were found to be. These are homologous to Ney of bacteria, there may explain why mild phenotype OGG1, it was found that if the knock-out mice present.

Proteins involved in Base excision repair (BER) in charge to prevent interruption thousands, of a continuous chain of DNA repair lesions thus caused premature aging, cancer, by endogenous human disease and many other, to maintain the integrity of the genome The repair of the line the first system, it has not been, mutation of exogenous. In addition to tight control of the continuous availability of the essential ingredient, not only required for the repair quickly and accurately, a mandatory feature prevents replication of damaged DNA and this basic and BER In order to, requiring spatial and temporal adjustment of cell cycle progression and BER. The main purpose of this review is to examine the new problems and controversy mammals meet the BER of links to DNA replication and DNA damage checkpoint road BER mechanism to regulate the BER capacity critically.

Arise due chemical changes in other hydrolyzed DNA base oxidation bases, and non-enzymatic methylation is lost, the chemical instability of specific DNA molecules in cell culture medium, exogenous by DNA or lesions (Environment the effect of multiple endogenous) and (intracellular) DNA reactive species. Result of interference with cell metabolism and accumulation of mutations, such modifications of the DNA is corrected if it is possible to react with replication and transcription of DNA. Among the many strategies, base excision repair (BER) pathway is a major repair to fix some changes to DNA found in DNA generally to maintain the reproduction and normal function of DNA project. BER deficiency affect genomic stability, and are involved in human diseases including many cancers premature aging, and neurodegenerative diseases. The human cells, respectively, which is believed to be 10000-20000 DNA damage repair daily. The enzymes involved in BER, catalyzes the excision of nucleotides to recognize the DNA bases damaged, damaged, please replace damaged, with a new one. Most of the BER is carried out by bringing the removal and replacement of one base and the so-called short patch BER. Nucleotide excision time BER so leads to transient formation of single strand breaks BER enzymes DNA, of course, is an important player in the repair of SSB. BER reaction in the cells is very fast, in many cases, it is possible to take a few minutes to the BER of individual events. Repair of DNA damage and require several rounds of BER rapidly, it may take several hours depending on the size of the BER enzymes are limited.

There is no convincing evidence for the regulation of the cell cycle of BER, but it is assumed on the basis of biochemical properties of BER enzyme, the majority of the preferred double-stranded DNA substrate, the BER is to act primarily through the G1 phase The cell cycle is reasonable. G1 in BER activity is prepared for DNA replication by maintaining the transfer error-free, to remove DNA damage. If the DNA base damage is not removed before the start of the replication of DNA, the integrity of the genome DNA synthesis overcome referred containing special POLS capable of performing an error-free DNA synthesis in a wide range of DNA damage, base provided by the backup system. TLS POLS, seven of them, human cells have 15 POLS 11 which can function in the BER has been proposed. Primary enzyme BER nuclear DNA Pol · β, Pol γ while involved in the BER of mitochondrial DNA. In addition, POLS is described AP lyase activity suggests feature in θBER and λ, have been identified in the POLS and long patch BER and δ is ε ι is included. Indeed, Pol λ is participating in allocation MUTYH / Pol λBER the road. 11 POLS and 7 POLS BER support combinations of potential functions to the fact that may be employed to maintain and repair a precise and efficient DNA base damage and perform backups reliable TLS ensures the BER. They, This conclusion, accumulated base damage of the DNA of non-repair, and survival (except thymine-DNA glycosylase) knockout mouse DNA glycosylase of all during the lifetime of you have suggested “correction” function are supported by the TLS strongly BER which is supported by the observation that it is fertile. However, ultra-small base station apparatus of unrepaired BER generated, the (DSB) DNA double-strand breaks that require (HR) repair homologous recombination or (NHEJ) joint end non-homologous either to be hit the fork of the DNA It has the potential to. Question, HR and NHEJ or can provide a method for maintaining genome stability backup repair capacity? Since not much Perhaps the XRCC1 and DNA ligase IIIα related to the repair of ultra-small base station equipment, all attempts to generate Pol β-deficient mice, led to early embryonic lethality. Haploinsufficiency to repair (inactivation of alleles of one gene), an ultra-small base even with the results of POLβ genetic susceptibility to DNA damage and significant genomic instability, which means that the BER is a key cellular system is responsible for

Base excision repair (BER) is the main pathway of DNA repair to correct the lesion and the underlying result from depurinatiation / depyrimidination oxidative damage, alkylation, and deamination. Patch short and long – manner two common 2, BER, and promotes the repair of DNA that is damaged. In shortpatch BER pathway results in the repair of single nucleotide tube. In addition, the long patch BER pathway, I will generate a repair tube of at least two nucleotides. And is initiated by either DNA glycosylase numerous recognized the BER, which catalyzes the removal of bases damaged. Complete path BER can be achieved by coordinated action of enzymes additional at least three. These enzymes perform ligation and downstream cross-section gap filling. I have led to advances in our understanding of the BER of the mammalian high conservation degree between mammalian and E. coli BER. This review provides an overview of the one-way mammalian BER.

Base excision repair pathway, have evolved to protect cells from the damaging effects of DNA damage endogenous induced by intracellular metabolites other changing the primary structure of DNA hydrolysis and reactive oxygen species. However, the base excision repair, it is opposed, an alkylating agent and a powerful ionizing radiation lesions are similar to those induced by endogenous factors are also important.

DNA repair, is a multi-step process aggregate multi several enzymes, maintaining the cellular genome intact for genetic insult. Single-strand breaks, such as oxidative base damage, alkylation, and losses under deamination site: one of these processes, acting on the base excision repair is the base excision repair, dealing with disease most common in the DNA enzymes individual has been identified. In recent years, we have seen great progress in the understanding of the interaction of many to make a flexible system and base excision repair function and its structure. This review describes the current knowledge of the biochemistry and structural biology of the various stages of the interaction of the recovery process and other cellular processes base excision repair, and base excision repair pathway, a few subpathways common.

Base excision repair (BER) is a path that is evolutionarily conserved it can be regarded as a repair mechanism “Horse” of the cells. More specifically, as well as most forms of spontaneous hydrolysis decay product of DNA, BER, fixes modification of sugar phosphate backbone or base and alkylating agent daily. Repair response follow the steps of key enzymes and five aims to remove the recovery and initial DNA damage of genetic material back to its original state. Sealing the participants of the DNA of the last remaining and filling to replace the nucleotide cut, cut difference phosphodiester backbone, connecting participants and reduce repair synthesis and / or cleaning base site conditions result in the removal of the base damaged or incorrect I to allow. Repair These steps are performed by a set of enzymes including DNA glycosylase, apyrimidinic / apurinic endonuclease, phosphatase, phosphodiesterase, kinase, polymerase and ligase. Mutation rate of decrease of cell survival, increased, and defects in components of the BER results in DNA-damaging agent hypersensitivity. Further, plays an important role alkylating agents such as clinical anti-cancer agent which time the relevant nucleoside analogues, and to determine the cellular response to ionizing radiation. Molecular data for the contribution of treatment-resistant time is described here and BER.

This is an important machine that mutation to prevent a recurrence of base excision repair and fix the DNA damage. Base excision repair process can be achieved by sequential enzymatic activity specific. It is identified by DNA glycosylase / AP lyase, which bases the damaged violate the β-N-glycoside bond in order to create a (AP) site DNA abasic first and repaired. Removal of the base, according to the early events of revenue or repair through a (2-10 nucleotides) repair pathway short patch or long patch (1 nucleotide). This has been recognized by the AP endonuclease have adopted for the DNA polymerase and DNA damage nickname fill the gap of the DNA site. The new DNA strand, ultimately, base excision repair is complete when it is closed by DNA ligase. R & D Systems, Inc. provides a qualitative base excision repair products, including endonuclease DNA glycosidase, and polymerase.