Contents 1 Variants 2 Family 3 Function 4 RAD51 expression in cancer 5 In double-strand break repair 6 MicroRNA control of RAD51 expression 7 Pathology 8 Interactions 9 References 10 External links

Variants[edit] Two alternatively spliced transcript variants of this gene, which encode distinct proteins, have been reported. Transcript variants utilizing alternative polyA signals exist.

Family[edit] In mammals, seven recA-like genes have been identified: Rad51, Rad51L1/B, Rad51L2/C, Rad51L3/D, XRCC2, XRCC3, and DMC1/Lim15.[8] All of these proteins, with the exception of meiosis-specific DMC1, are essential for development in mammals. Rad51 is a member of the RecA-like NTPases.

Function[edit] In humans, RAD51 is a 339-amino acid protein that plays a major role in homologous recombination of DNA during double strand break repair. In this process, an ATP dependent DNA strand exchange takes place in which a template strand invades base-paired strands of homologous DNA molecules. RAD51 is involved in the search for homology and strand pairing stages of the process. Unlike other proteins involved in DNA metabolism, the RecA/Rad51 family forms a helical nucleoprotein filament on DNA.[9] This protein can interact with the ssDNA-binding protein RPA, BRCA2, PALB2[10] and RAD52. The structural basis for Rad51 filament formation and its functional mechanism still remain poorly understood. However, recent studies using fluorescent labeled Rad51[11] have indicated that Rad51 fragments elongate via multiple nucleation events followed by growth, with the total fragment terminating when it reaches about 2 μm in length. Disassociation of Rad51 from dsDNA, however, is slow and incomplete, suggesting that there is a separate mechanism that accomplishes this.

RAD51 expression in cancer[edit] In eukaryotes, RAD51 protein has a central role in homologous recombinational repair. RAD51 catalyses strand transfer between a broken sequence and its undamaged homologue to allow re-synthesis of the damaged region (see homologous recombination models). Numerous studies report that RAD51 is over-expressed in different cancers (see Table 1). In many of these studies, elevated expression of RAD51 is correlated with decreased patient survival. There are also some reports of under-expression of RAD51 in cancers (see Table 1). Where RAD51 expression was measured in conjunction with BRCA1 expression, an inverse correlation was found.[12][13] This was interpreted as selection for increased RAD51 expression and thus increased homologous recombinational repair (HRR) (by the HRR RAD52-RAD51 back-up pathway[14]) to compensate for the added DNA damages remaining when BRCA1 was deficient.[12][13][15] Many cancers have epigenetic deficiencies in various DNA repair genes (see Frequencies of epimutations in DNA repair genes in cancers), likely causing increased unrepaired DNA damages. The over expression of RAD51 seen in many cancers may reflect compensatory RAD51 over expression (as in BRCA1 deficiency) and increased HRR to at least partially deal with such excess DNA damages. Under-expression of RAD51 would itself lead to increased unrepaired DNA damages. Replication errors past these damages (see translesion synthesis), would lead to increased mutations and cancer. Table 1. RAD51 expression in sporadic cancers Cancer Over or Under expression Frequency of altered expression Evaluation method Ref. Breast cancer (invasive ductal) Over-expression - Immunohistochemistry [12] Breast cancer (BRCA1 deficient) Over-expression - messenger RNA [13] Breast cancer (progesteron receptor negative) Over-expression - messenger RNA [16] Breast cancer Under-expression 30% Immunohistochemistry [17] Pancreatic cancer Over-expression 74% Immunohistochemistry [18] Pancreatic cancer Over-expression 66% Immunohistochemistry [19] Head and neck squamous cancers Over-expression 75% Immunohistochemistry [20] Prostate cancer Over-expression 33% Immunohistochemistry [21] Non-small-cell lung cancer Over-expression 29% Immunohistochemistry [22] Soft tissue sarcoma Over-expression 95% Immunohistochemistry [23] Esophageal squamous cell cancer Over-expression 47% Immunohistochemistry [24] Renal cell carcinoma Under-expression 100% Western (protein) blotting and mRNA [25]

In double-strand break repair[edit] Double-strand break (DSB) repair by homologous recombination is initiated by 5' to 3' strand resection (DSB resection). In humans, the DNA2 nuclease cuts back the 5'-to-3' strand at the DSB to generate a 3' single-strand DNA overhang strand.[26][27] A number of paralogs (see Figure) of RAD51 are essential for RAD51 protein recruitment or stabilization at damage sites in vertebrates. Protein domains in homologous recombination-related proteins are conserved across the three main groups of life: archaea, bacteria and eukaryotes. In vertebrates and plants, five paralogs of RAD51 are expressed in somatic cells, including RAD51B (RAD51L1), RAD51C (RAD51L2), RAD51D (RAD51L3), XRCC2 and XRCC3. They each share about 25% amino acid sequence identity with RAD51 and with each other.[28] Outside of plants and vertebrates, a much broader diversity of Rad51 recombinase paralog proteins exists. In budding yeast, Saccharomyces cerevisiae, the paralogs Rad55 and Rad57 are present, which form a complex that associates with yeast Rad51 to ssDNA. The recombinase paralog rfs-1 is found in the round worm Caenorhabditis elegans, where it is not essential for homologous recombination. Among archaea the RadB and RadC recombinase paralogs are found in many organisms belonging to Euryarchaeota while a broader diversity of related recombinase paralogs seem to be found in the Crenarchaea including Ral1, Ral2, Ral3, RadC, RadC1, and RadC2. The RAD51 paralogs contribute to efficient DNA double-strand break repair by homologous recombination and depletion of any paralog often results in significant decreases in homologous recombination frequency.[29] The paralogs form two identified complexes: BCDX2 (RAD51B-RAD51C-RAD51D-XRCC2) and CX3 (RAD51C-XRCC3). These two complexes act at two different stages of homologous recombinational DNA repair. The BCDX2 complex is responsible for RAD51 recruitment or stabilization at damage sites.[29] The BCDX2 complex appears to act by facilitating the assembly or stability of the RAD51 nucleoprotein filament. The CX3 complex acts downstream of RAD51 recruitment to damage sites.[29] Another complex, the BRCA1-PALB2-BRCA2 complex, and the RAD51 paralogs cooperate to load RAD51 onto ssDNA coated with RPA to form the essential recombination intermediate, the RAD51-ssDNA filament.[30] In mice and humans, the BRCA2 complex primarily mediates orderly assembly of RAD51 on ssDNA, the form that is active for homologous pairing and strand invasion.[31] BRCA2 also redirects RAD51 from dsDNA and prevents dissociation from ssDNA.[31] However, in the presence of a BRCA2 mutation, human RAD52 can mediate RAD51 assembly on ssDNA and substitute for BRCA2 in homologous recombinational DNA repair,[32] though with lower efficiency than BRCA2. Further steps are detailed in the article Homologous recombination.

MicroRNA control of RAD51 expression[edit] In mammals, microRNAs (miRNAs) regulate about 60% of the transcriptional activity of protein-encoding genes.[33] Some miRNAs also undergo methylation-associated silencing in cancer cells.[34][35] If a repressive miRNA is silenced by hypermethylation or deletion, then a gene it is targeting becomes over-expressed. At least eight miRNAs have been identified that repress RAD51 expression, and five of them appear to be important in cancer. For instance, in triple negative breast cancers (TNBC), over-expression of miR-155 occurs together with repression of RAD51.[36] Further tests directly showed that transfecting breast cancer cells with a vector over-expressing miR-155 represses RAD51, causing decreased homologous recombination and increased sensitivity to ionizing radiation.[36] Four further miRNAs that repress RAD51 (miR-148b* and miR-193b*,[37] miR-506,[38] and miR-34a[39]) are under-expressed in cancers, presumably leading to induction of RAD51. Under-expression of miR-148b* and miR-193b* cause an observed induction of RAD51 expression.[37] Deletions of 148b* and miR-193b* in serous ovarian tumors correlate with increased incidences of (possibly carcinogenic) losses of heterozygosity (LOH). This excess LOH was thought to be due to excess recombination caused by induced expression of RAD51.[37] Under-expression of miR-506 is associated with early time to recurrence (and reduced survival) for epithelial ovarian cancer patients.[40] Methylation of the promoter of miR-34a, resulting in under-expression of miR-34a, is observed in 79% of prostate cancers and 63% of primary melanomas.[41] Under-expressed levels of miR-34a are also seen in 63% of non-small cell lung cancers,[42] and 36% of colon cancers.[43] miR-34a is also generally under-expressed in primary neuroblastoma tumors.[44] Table 2 summarizes these five microRNAs, their over or under expression, and the cancers in which their altered expression was noted to occur. Table 2. Altered expression of microRNAs that affect RAD51 expression in sporadic cancers MicroRNA miRNA Over/Under expression Cancer Ref. miR-155 Over-expression Triple negative breast cancer [36] miR-148b* Under-expression Ovarian cancer [37] miR-193b* Under-expression Ovarian cancer [37] miR-506 Under-expression Ovarian cancer [40] miR-34a Under-expression Prostate, Melanoma [41] Non-small cell lung cancer [42] Colon cancer [43] Neuroblastoma [44] The information summarized in Table 2 suggests that under-expression of microRNAs (causing induction of RAD51) occurs frequently in cancers. Over-expression of a microRNA that causes repression of RAD51 appears to be less frequent. The data in Table 1 (above) indicates that, in general, over-expression of RAD51 is more frequent in cancers than under-expression. Three other microRNAs were identified, by various criteria, as likely to repress RAD51 (miR-96,[45] miR-203,[46] and miR-103/107[47]). These microRNAs were then tested by over-expressing them in cells in vitro, and they were found to indeed repress RAD51. This repression was generally associated with decreased HR and increased sensitivity of the cells to DNA damaging agents.

Pathology[edit] This protein is also found to interact with PALB2[10] and BRCA2, which may be important for the cellular response to DNA damage. BRCA2 is shown to regulate both the intracellular localization and DNA-binding ability of this protein. Loss of these controls following BRCA2 inactivation may be a key event leading to genomic instability and tumorigenesis.[48] Several alterations of the Rad51 gene have been associated with an increased risk of developing breast cancer. The breast cancer susceptibility protein BRCA2 and PALB2 controls the function of Rad51 in the pathway for DNA repair by homologous recombination.[10][49] In addition to the data listed in Table 1, increased RAD51 expression levels have been identified in metastatic canine mammary carcinoma, indicating that genomic instability plays an important role in the carcinogenesis of this tumor type.[50][51][52][53]

Interactions[edit] RAD51 has been shown to interact with: Abl gene,[54] Ataxia telangiectasia mutated,[54] BARD1,[55] BRCA1,[55][56][57][58] BRCA2,[49][55][56][59][60][61][62][63][64][65][66][67][68] BRCC3,[55] BRE,[55] Bloom syndrome protein,[69] DMC1,[70] RAD54,[71] P53[55][72][73] RAD52,[54] RAD54B,[74] and UBE2I.[75][76]

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External links[edit] RAD51 Protein at the US National Library of Medicine Medical Subject Headings (MeSH) v t e PDB gallery 1b22: RAD51 (N-TERMINAL DOMAIN)  1n0w: Crystal structure of a RAD51-BRCA2 BRC repeat complex  v t e DNA repair Excision repair Base excision repair/AP site DNA glycosylase Uracil-DNA glycosylase Poly ADP ribose polymerase Nucleotide excision repair/ERCC XPA XPB XPC XPD/ERCC2 XPE/DDB1 XPF/DDB1 XPG/ERCC5 ERCC1 RPA RAD23A RAD23B Excinuclease DNA mismatch repair MLH1 MSH2 Other forms of repair Transcription-coupled repair ERCC6 ERCC8 Homology directed repair Non-homologous end joining Ku Microhomology-mediated end joining Postreplication repair Photolyase CRY1 CRY2 Other/ungrouped proteins Ogt PcrA Proliferating Cell Nuclear Antigen Homologous recombination RecA/RAD51 Sgs1 Slx4 Regulation SOS box SOS response Other/ungrouped 8-Oxoguanine Adaptive response Meiotic recombination checkpoint RecF pathway DNA helicase: BLM WRN FANC proteins: core protein complex FANCA FANCB FANCC FANCE FANCF FANCG FANCL FANCM FANCD1 FANCD2 FANCI FANCJ FANCN Retrieved from "" Categories: Genes on human chromosome 15DNA repairHidden categories: CS1 maint: Multiple names: authors list

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RAD51 - Photos and All Basic Informations

RAD51 More Links

Protein Data BankGene NomenclatureMendelian Inheritance In ManMouse Genome InformaticsHomoloGeneGeneCardsChromosome 15 (human)ChromosomeChromosome 15 (human)Chromosome 15 (human)Genomic Location For RAD51Genomic Location For RAD51Locus (genetics)Base PairBase PairChromosome 2 (mouse)ChromosomeChromosome 2 (mouse)Genomic Location For RAD51Genomic Location For RAD51Locus (genetics)Base PairBase PairGene ExpressionGene OntologyEntrezEnsemblUniProtPubMedWikidataGeneEnzymeDNA RepairHomology (biology)BacteriaRecAArchaeaSaccharomyces CerevisiaeMammalsRAD51L1RAD51CRAD51L3XRCC2XRCC3DMC1Amino AcidHomologous RecombinationNucleoproteinReplication Protein ABRCA2PALB2RAD52Homologous RecombinationCancer EpigeneticsDNA RepairHomologous RecombinationDNA2LHomology (biology)EnlargeProtein DomainsThree-domain SystemHomology (biology)RAD51L1RAD51CRAD51L3XRCC2XRCC3Saccharomyces CerevisiaeCaenorhabditis ElegansArchaeaEuryarchaeotaHomologous RecombinationHomologous RecombinationDNA RepairRAD51BRCA1PALB2BRCA2Replication Protein ABRCA2RAD52Homologous RecombinationHomologous RecombinationMicroRNAGene TranscriptionPALB2BRCA2Breast CancerBRCA2PALB2Protein-protein InteractionAbl GeneAtaxia Telangiectasia MutatedBARD1BRCA1BRCA2BRCC3BRE (gene)Bloom Syndrome ProteinDMC1 (gene)DNA Repair And Recombination Protein RAD54-likeP53RAD52RAD54BUBE2IEnsembl Genome Database ProjectEnsembl Genome Database ProjectDigital Object IdentifierPubMed IdentifierDigital Object IdentifierInternational Standard Serial NumberPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierCategory:CS1 Maint: Multiple Names: Authors ListDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierDigital Object IdentifierPubMed CentralPubMed IdentifierDigital Object IdentifierPubMed IdentifierMedical Subject HeadingsTemplate:PDB GalleryTemplate Talk:PDB Gallery1b22: RAD51 (N-TERMINAL DOMAIN)1n0w: Crystal Structure Of A RAD51-BRCA2 BRC Repeat ComplexTemplate:DNA RepairDNA RepairExcision RepairBase Excision RepairAP SiteDNA GlycosylaseUracil-DNA GlycosylasePoly ADP Ribose PolymeraseNucleotide Excision RepairExcision Repair Cross-complementingXPAXPBXPC (gene)ERCC2DDB1ERCC4ERCC5ERCC1Replication Protein ARAD23ARAD23BExcinucleaseDNA Mismatch RepairMLH1MSH2Transcription-coupled RepairERCC6ERCC8 (gene)Homology Directed RepairNon-homologous End JoiningKu (protein)Microhomology-mediated End JoiningPostreplication RepairPhotolyaseCRY1CRY2OgtPcrAProliferating Cell Nuclear AntigenHomologous RecombinationRecASgs1Slx4SOS BoxSOS Response8-OxoguanineAdaptive ResponseMeiotic Recombination CheckpointRecF PathwayHelicaseBloom Syndrome ProteinWerner Syndrome ATP-dependent HelicaseFANC ProteinsFANCAFANCBFanconi Anemia, Complementation Group CFANCEFANCFFANCGFANCLFANCMBRCA1FANCD2FANCIBRIP1PALB2Help:CategoryCategory:Genes On Human Chromosome 15Category:DNA RepairCategory:CS1 Maint: Multiple Names: Authors ListDiscussion 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