MSH2

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MSH2
Protein MSH2 PDB 2o8b.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases MSH2, mutS homolog 2, COCA1, FCC1, HNPCC, HNPCC1, LCFS2
External IDs OMIM: 609309 MGI: 101816 HomoloGene: 210 GeneCards: 4436
RNA expression pattern
PBB GE MSH2 209421 at tn.png
More reference expression data
Orthologs
Species Human Mouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_000251
NM_001258281

NM_008628

RefSeq (protein)

NP_000242.1
NP_001245210.1

NP_032654.1

Location (UCSC) Chr 2: 47.4 – 47.56 Mb Chr 17: 87.67 – 87.72 Mb
PubMed search [1] [2]
Wikidata
View/Edit Human View/Edit Mouse

DNA mismatch repair protein Msh2 also known as MutS protein homolog 2 or MSH2 is a protein that in humans is encoded by the MSH2 gene, which is located on chromosome 2. MSH2 is a tumor suppressor gene and more specifically a caretaker gene that codes for a DNA mismatch repair (MMR) protein, MSH2, which forms a heterodimer with MSH6 to make the human MutSα mismatch repair complex. It also dimerizes with MSH3 to form the MutSβ DNA repair complex. MSH2 is involved in many different forms of DNA repair, including transcription-coupled repair,[1] homologous recombination,[2] and base excision repair.[3]

Mutations in the MSH2 gene are associated with microsatellite instability and some cancers, especially with hereditary nonpolyposis colorectal cancer (HNPCC).

Clinical significance[edit]

Hereditary nonpolyposis colorectal cancer (HNPCC), sometimes referred to as Lynch syndrome, is inherited in an autosomal dominant fashion, where inheritance of only one copy of a mutated mismatch repair gene is enough to cause disease phenotype. Mutations in the MSH2 gene account for 40% of genetic alterations associated with this disease and is the leading cause, together with MLH1 mutations.[4] Mutations associated with HNPCC are broadly distributed in all domains of MSH2, and hypothetical functions of these mutations based on the crystal structure of the MutSα include protein–protein interactions, stability, allosteric regulation, MSH2-MSH6 interface, and DNA binding.[5] Mutations in MSH2 and other mismatch repair genes cause DNA damage to go unrepaired, resulting in an increase in mutation frequency. These mutations build up over a person's life that otherwise would not have occurred had the DNA been repaired properly.

Microsatellite instability[edit]

The viability of MMR genes including MSH2 can be tracked via microsatellite instability, a biomarker test that analyzes short sequence repeats which are very difficult for cells to replicate without a functioning mismatch repair system. Because these sequences vary in the population, the actual number of copies of short sequence repeats does not matter, just that the number the patient does have is consistent from tissue to tissue and over time. This phenomenon occurs because these sequences are prone to mistakes by the DNA replication complex, which then need to be fixed by the mismatch repair genes. If these are not working, over time either duplications or deletions of these sequences will occur, leading to different numbers of repeats in the same patient.

71% of HNPCC patients show microsatellite instability.[6] Detection methods for microsatellite instability include polymerase chain reaction (PCR) and immunohistochemical (IHC) methods, polymerase chain checking the DNA and immunohistochemical surveying mismatch repair protein levels. "Currently, there are evidences that universal testing for MSI starting with either IHC or PCR-based MSI testing is cost effective, sensitive, specific and is generally widely accepted."[7]

Role in mismatch repair[edit]

In eukaryotes from yeast to humans, MSH2 dimerizes with MSH6 to form the MutSα complex,[8] which is involved in base mismatch repair and short insertion/deletion loops.[9] MSH2 heterodimerization stabilizes MSH6, which is not stable because of its N-terminal disordered domain. Conversely, MSH2 does not have a nuclear localization sequence (NLS), so it is believed that MSH2 and MSH6 dimerize in the cytoplasm and then are imported into the nucleus together.[10] In the MutSα dimer, MSH6 interacts with the DNA for mismatch recognition while MSH2 provides the stability that MSH6 requires. MSH2 can be imported into the nucleus without dimerizing to MSH6, in this case, MSH2 is probably dimerized to MSH3 to form MutSβ.[11] MSH2 has two interacting domains with MSH6 in the MutSα heterodimer, a DNA interacting domain, and an ATPase domain.[12]

The MutSα dimer scans double stranded DNA in the nucleus, looking for mismatched bases. When the complex finds one, it repairs the mutation in an ATP dependent manner. The MSH2 domain of MutSα prefers ADP to ATP, with the MSH6 domain preferring the opposite. Studies have indicated that MutSα only scans DNA with the MSH2 domain harboring ADP, while the MSH6 domain can contain either ADP or ATP.[13] MutSα then associates with MLH1 to repair the damaged DNA.

MutSβ is formed when MSH2 complexes with MSH3 instead of MSH6. This dimer repairs longer insertion/deletion loops than MutSα.[14] Because of the nature of the mutations that this complex repairs, this is probably the state of MSH2 that causes the microsatellite instability phenotype. Large DNA insertions and deletions intrinsically bend the DNA double helix. The MSH2/MSH3 dimer can recognize this topology and initiate repair. The mechanism by which it recognizes mutations is different as well, because it separates the two DNA strands, which MutSα does not.[15]

Interactions[edit]

MSH2 has been shown to interact with:

Epigenetic MSH2 deficiencies in cancer[edit]

DNA damage appears to be the primary underlying cause of cancer,[28][29] and deficiencies in expression of DNA repair genes appear to underlie many forms of cancer.[30][31] If DNA repair is deficient, DNA damage tends to accumulate. Such excess DNA damage may increase mutations due to error-prone translesion synthesis and error prone repair (see e.g. microhomology-mediated end joining). Elevated DNA damage may also increase epigenetic alterations due to errors during DNA repair.[32][33] Such mutations and epigenetic alterations may give rise to cancer.

Reductions in expression of DNA repair genes (usually caused by epigenetic alterations) are very common in cancers, and are ordinarily much more frequent than mutational defects in DNA repair genes in cancers.[34] (See Frequencies of epimutations in DNA repair genes.) In a study of MSH2 in non-small cell lung cancer (NSCLC), no mutations were found while 29% of NSCLC had epigenetic reduction of MSH2 expression.[35] In acute lymphoblastoid leukemia (ALL), no MSH2 mutations were found[36] while 43% of ALL patients showed MSH2 promoter methylation and 86% of relapsed ALL patients had MSH2 promoter methylation.[37] There were, however, mutations in four other genes in ALL patients that destabilized the MSH2 protein, and these were defective in 11% of children with ALL and 16% of adults with this cancer.[36]

Methylation of the promoter region of the MSH2 gene is correlated with the lack of expression of the MSH2 protein in esophageal cancer,[38] in non-small-cell lung cancer,[35][39] and in colorectal cancer.[40] These correlations suggest that methylation of the promoter region of the MSH2 gene reduces expression of the MSH2 protein. Such promoter methylation would reduce DNA repair in the four pathways in which MSH2 participates: DNA mismatch repair, transcription-coupled repair[1] homologous recombination,[2][41][42] and base excision repair.[3] Such reductions in repair likely allow excess DNA damage to accumulate and contribute to carcinogenesis.

The frequencies of MSH2 promoter methylation in several different cancers are indicated in the Table.

MSH2 promoter methylation in sporadic cancers
Cancer Frequency of MSH2 promoter methylation Ref.
Acute lymphoblastic leukemia 43% [37]
Relapsed Acute lymphoblastic leukemia 86% [37]
Renal cell carcinoma 51% - 55% [43][44]
Esophageal squamous cell carcinoma 29% - 48% [38][45]
Head and neck squamous-cell carcinoma 27% - 36% [46][47][48]
Non-small cell lung cancer 29%-34% [35][39]
Hepatocellular carcinoma 10% - 29% [49]
Colorectal cancer 3% - 24% [40][50][51][52]
Soft-tissue sarcoma 8% [53]

See also[edit]

References[edit]

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Further reading[edit]

  • Jiricny J (1994). "Colon cancer and DNA repair: have mismatches met their match?". Trends Genet. 10 (5): 164–8. doi:10.1016/0168-9525(94)90093-0. PMID 8036718. 
  • Fishel R, Wilson T (1997). "MutS homologs in mammalian cells.". Curr. Opin. Genet. Dev. 7 (1): 105–13. doi:10.1016/S0959-437X(97)80117-7. PMID 9024626. 
  • Lothe RA (1997). "Microsatellite instability in human solid tumors.". Molecular medicine today 3 (2): 61–8. doi:10.1016/S1357-4310(96)10055-1. PMID 9060003. 
  • Peltomäki P, de la Chapelle A (1997). "Mutations predisposing to hereditary nonpolyposis colorectal cancer.". Adv. Cancer Res. 71: 93–119. doi:10.1016/S0065-230X(08)60097-4. PMID 9111864. 
  • Papadopoulos N, Lindblom A (1997). "Molecular basis of HNPCC: mutations of MMR genes.". Hum. Mutat. 10 (2): 89–99. doi:10.1002/(SICI)1098-1004(1997)10:2<89::AID-HUMU1>3.0.CO;2-H. PMID 9259192. 
  • Kauh J, Umbreit J (2004). "Colorectal cancer prevention.". Current Problems in Cancer 28 (5): 240–64. doi:10.1016/j.currproblcancer.2004.05.004. PMID 15375803. 
  • Warusavitarne J, Schnitzler M (2007). "The role of chemotherapy in microsatellite unstable (MSI-H) colorectal cancer.". International journal of colorectal disease 22 (7): 739–48. doi:10.1007/s00384-006-0228-0. PMID 17109103. 
  • Wei Q, Xu X, Cheng L, et al. (1995). "Simultaneous amplification of four DNA repair genes and beta-actin in human lymphocytes by multiplex reverse transcriptase-PCR.". Cancer Res. 55 (21): 5025–9. PMID 7585546. 
  • Wilson TM, Ewel A, Duguid JR, et al. (1995). "Differential cellular expression of the human MSH2 repair enzyme in small and large intestine.". Cancer Res. 55 (22): 5146–50. PMID 7585562. 
  • Drummond JT, Li GM, Longley MJ, Modrich P (1995). "Isolation of an hMSH2-p160 heterodimer that restores DNA mismatch repair to tumor cells.". Science 268 (5219): 1909–12. doi:10.1126/science.7604264. PMID 7604264. 
  • Kolodner RD, Hall NR, Lipford J, et al. (1995). "Structure of the human MSH2 locus and analysis of two Muir-Torre kindreds for msh2 mutations.". Genomics 24 (3): 516–26. doi:10.1006/geno.1994.1661. PMID 7713503. 
  • Wijnen J, Vasen H, Khan PM, et al. (1995). "Seven new mutations in hMSH2, an HNPCC gene, identified by denaturing gradient-gel electrophoresis.". Am. J. Hum. Genet. 56 (5): 1060–6. PMC 1801472. PMID 7726159. 
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