PMS2 Antibody

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Description

Introduction to PMS2 Antibody

PMS2 antibody is a specialized immunological tool targeting the PMS2 protein, a critical component of the DNA mismatch repair (MMR) system. PMS2 (Postmeiotic Segregation Increased 2) forms a heterodimer with MLH1 to constitute the MutLα complex, which corrects DNA replication errors and maintains genomic stability . Antibodies against PMS2 are primarily used in immunohistochemistry (IHC) and molecular research to assess MMR deficiency, which is linked to hereditary cancers (e.g., Lynch syndrome) and microsatellite instability (MSI) in tumors .

Biological and Clinical Significance

PMS2 in DNA Repair and Disease

  • PMS2 repairs mismatched bases during DNA replication and recombination. Loss of PMS2 expression disrupts MMR, leading to MSI and increased cancer risk .

  • Germline PMS2 mutations are associated with Lynch syndrome and Turcot syndrome, particularly when biallelic mutations occur .

Diagnostic Utility

  • PMS2 IHC staining is a gold standard for identifying MMR-deficient tumors. Loss of nuclear PMS2 expression in tumor cells (retained in stromal cells) suggests MMR deficiency .

  • Combined with MSH6 staining, PMS2 antibodies form a two-antibody algorithm for efficient MMR testing, achieving a 99% detection rate of MMR deficiency in colorectal cancer .

Key Validation Data

Antibody CloneApplicationObserved Band Size (Western Blot)Specificity Confirmed By
EPR3947 (ab214442)IHC, WB, Flow Cyt120 kDa (vs. predicted 96 kDa)Knockout cell lines (HeLa, HAP1)
C-20 (Source 2)Western Blot96 kDaProtein truncation in mutants
  • Western Blot: PMS2 antibodies detect a ~120 kDa band in wild-type cells, absent in PMS2 knockout controls .

  • Immunohistochemistry: Robust nuclear staining in normal tissues (e.g., colon, breast), with loss observed in MMR-deficient tumors .

PMS2 Expression in Colorectal Cancer (CRC)

Tumor StagePMS2 mRNA Level (Mean ± SD)PMS2 Protein Expression (%)Remmele Score
Normal1.00 ± 0.0095–100%9.0
Stage I0.92 ± 0.1851–100%7.5
Stage IV0.47 ± 0.23<1%3.0
  • PMS2 mRNA and protein levels decrease significantly with tumor progression (P < 0.001) .

  • Loss of PMS2 correlates with poor differentiation and advanced staging .

Functional Insights from Experimental Models

  • Prostate Cancer: Restoring PMS2 expression in PCa cells suppresses tumor growth (in vitro and in vivo) by inducing apoptosis and downregulating anti-apoptotic BCL2A1 .

  • Knockout Mice: Pms2⁻/⁻ mice exhibit elevated mutation rates, lymphomas, and impaired antibody class-switch recombination, highlighting PMS2’s role in genome integrity .

Challenges and Pitfalls

  • Pseudogenes: PMS2 shares homology with >13 pseudogenes (e.g., PMS2CL), complicating PCR and sequencing analyses .

  • Antibody Cross-Reactivity: Some clones may detect nonspecific bands; validation using knockout controls is essential .

Future Directions

  • Therapeutic Targeting: PMS2-deficient tumors may respond to immunotherapy due to high neoantigen loads .

  • Standardization: Refinement of two-antibody algorithms for non-colorectal cancers (e.g., endometrial, gastric) .

Product Specs

Buffer
PBS with 0.1% Sodium Azide, 50% Glycerol, pH 7.3. Store at -20°C. Avoid freeze/thaw cycles.
Lead Time
Generally, we can ship the products within 1-3 business days after receiving your order. The delivery time may vary depending on the purchasing method or location. Please consult your local distributors for specific delivery times.
Synonyms
DNA mismatch repair gene homologue antibody; DNA mismatch repair protein PMS2 antibody; H_DJ0042M02.9 antibody; HNPCC4 antibody; Mismatch repair endonuclease PMS2 antibody; Mismatch repair gene PMSL2 antibody; MLH4 antibody; PMS 2 antibody; PMS1 homolog 2 mismatch repair system antibody; PMS1 protein homolog 2 antibody; PMS2 antibody; PMS2 postmeiotic segregation increased 2 antibody; PMS2 postmeiotic segregation increased 2 (S. cerevisiae) antibody; PMS2_HUMAN antibody; PMS2CL antibody; PMSL2 antibody; Postmeiotic segregation increased; S. cerevisiae; 2 antibody
Target Names
Uniprot No.

Target Background

Function
PMS2 is a crucial component of the post-replicative DNA mismatch repair system (MMR). It forms a heterodimer with MLH1, creating MutL alpha. DNA repair is initiated when MutS alpha (MSH2-MSH6) or MutS beta (MSH2-MSH3) binds to a dsDNA mismatch, leading to the recruitment of MutL alpha to the heteroduplex. The assembly of the MutL-MutS-heteroduplex ternary complex, in the presence of RFC and PCNA, activates the endonuclease activity of PMS2. This activity introduces single-strand breaks near the mismatch, generating new entry points for the exonuclease EXO1 to degrade the strand containing the mismatch. DNA methylation prevents cleavage, ensuring that only the newly mutated DNA strand is corrected. MutL alpha (MLH1-PMS2) interacts physically with the clamp loader subunits of DNA polymerase III, suggesting a potential role in recruiting DNA polymerase III to the site of MMR. PMS2 is also implicated in DNA damage signaling, a process that induces cell cycle arrest and can lead to apoptosis in the event of significant DNA damage.
Gene References Into Functions
  1. Identified a translocation disrupting MLH1 and three mutations in MSH6 and PMS2 that increase the risk of endometrial, colorectal, brain, and ovarian cancers. PMID: 28466842
  2. Chronic smoking impacts the oral mucosa, leading to methylation of genes MRE11A, PMS2, XRCC1, and MLH3. This methylation results in a reduction in gene expression of MRE11A and PMS2, showing methylation levels greater than or equal to 50%. These findings suggest that smoking contributes to methylation and reduced expression of DNA repair genes. PMID: 29775861
  3. Low PMS2 expression is associated with Colonic Adenoma and Adenocarcinoma. PMID: 29976631
  4. A genetic analysis of 84 colorectal tumors revealed distinct characteristics in tumors from patients with PMS2-associated Lynch syndrome compared to colorectal tumors associated with defects in other mismatch repair genes. PMID: 29758216
  5. Research indicates that the MSH6 Glu39Gly polymorphism is associated with the risk of developing sporadic colorectal cancer in the Polish population. This risk is further increased in combination with the wild-type allele of PMS2 IVS1-1121C > T. PMID: 28451866
  6. MLH1 and PMS2 are imported into the nucleus through a classical nuclear import pathway. PMID: 29175432
  7. This is the first documented case of synchronous colon and prostate cancers, with isolated PMS2 loss observed in the colon cancer but intact DNA mismatch repair protein expressions present in the prostate cancer. PMID: 30061258
  8. Data suggest that MLH1(L749P) and MLH1(Y750X) make PMS2 susceptible to calyculin-induced degradation, suggesting that the specific degradation of PMS2 could be a novel mechanism to regulate the MLH1-PMS2 heterodimer protein MutLalpha. PMID: 28767177
  9. Mutation scanning results on the largest published cohort to date confirm that the highest detection rate of PMS2 mutations is found in patients with a tumor showing isolated loss of PMS2 expression in addition to germline PMS2 mutation in patients with Lynch syndrome or mismatch repair deficiency syndrome. PMID: 27435373
  10. Germline PMS2 and somatic POLE exonuclease mutations cause hypermutability of the leading DNA strand in biallelic mismatch repair deficiency syndrome brain tumors. PMID: 28805995
  11. Loss of PMS2 expression is associated with colorectal carcinoma. PMID: 28651545
  12. A novel pathogenic PMS2 mutation was identified in a mismatch repair deficiency patient. PMID: 27017610
  13. High PMS2 expression is associated with the development of genetic instability and is linked to tumor aggressiveness and early PSA recurrence in prostate cancer. PMID: 27803051
  14. Data suggest that yeast Mlh1-Mlh3 heterodimer does not exhibit the hallmarks of a canonical (structure-selective) Holliday junction resolvase/endonuclease. Multiple Mlh1-Mlh3 heterodimers appear to load onto DNA to form an activated polymer that cleaves DNA; human MLH1-PMS2 exhibits similar characteristics. (MLH = mutL homolog protein; PMS2 = post meiotic segregation increased 2 protein) PMID: 28453523
  15. In an individual with mismatch repair deficiency syndrome, PMS2 was found to be homozygously inactivated by a complex chromosomal rearrangement. PMID: 27329736
  16. Research shows that DNA repair genes (fan1 and pms2) significantly modify age at onset in Huntington's Disease and Spinocerebellar Ataxias, suggesting a common pathogenic mechanism that could operate through the observed somatic expansion of repeats. PMID: 27044000
  17. This case study indicates that while the FOXL2 402C > G mutation determines the development of granulosa cell tumor, the PMS2 mutation may be the initial driver of carcinogenesis. Immunohistochemistry-based tumor testing for mismatch repair gene expression may be necessary for granulosa cell tumors to determine their malignant potential or if they are part of Lynch syndrome. PMID: 28347324
  18. A total of 201 unique disease-predisposing mismatch repair gene mutations were identified in 369 Lynch syndrome families. These mutations affected MLH1 in 40%, MSH2 in 36%, MSH6 in 18%, and PMS2 in 6% of the families. PMID: 27601186
  19. Molecular mechanisms linking MMR with chemoresistance suggest that stabilization of PMS2 expression might be useful in overcoming cisplatin resistance in EOC. PMID: 26423401
  20. PMS2 mutation carriers with retention of RNA expression developed CRC 9 years later than those with loss of RNA expression. If confirmed, this finding could justify delaying surveillance in these cases. Cancer risk was not influenced by a parent-of-origin effect. PMID: 26110232
  21. Individuals carrying a MMR gene (MLH1, MSH2, PMS2, or MSH6) mutation have an increased risk of developing cancers at multiple sites, most notably colorectal and endometrial carcinomas. PMID: 26895986
  22. Germline mutations in MLH1, MSH2, MSH6, and PMS2 have been shown to cause Lynch syndrome. A total of 234 monoallelic PMS2 mutation carriers from 170 families were included. PMID: 25856668
  23. Loss of MLH-1/PMS-2 expression was associated with right-colon location, poor and mucinous differentiation, and dense lymphocytic infiltration in colorectal adenocarcinoma. PMID: 26097592
  24. Heterozygous germline mutations in any of the mismatch repair (MMR) genes, MLH1, MSH2, MSH6, and PMS2, cause Lynch syndrome (LS), an autosomal dominant cancer predisposition syndrome. PMID: 26544533
  25. A reliable tool for accurate molecular analysis of genes containing multiple copies of highly homologous sequences, improving PMS2 molecular analysis for patients with Lynch syndrome. PMID: 26320870
  26. These results demonstrate a functional role for PMS2 in protecting against prostate cancer progression by enhancing apoptosis of prostate cancer cells and inhibiting cell proliferation, migration, and invasion in vitro, as well as tumor growth in vivo. PMID: 26036629
  27. MutSalpha, proliferating cell nuclear antigen, and replication factor C activate MutLalpha endonuclease to remove the 1-nucleotide Okazaki fragment flaps. PMID: 26224637
  28. A genotype-phenotype study of c.2002A>G demonstrates that an extremely low level of PMS2 expression likely delays cancer onset, a feature that could be exploited in cancer preventive interventions. PMID: 25691505
  29. Research reports a high frequency of MLH1 germline mutations in Lynch syndrome patients with colorectal and endometrial carcinoma, demonstrating isolated loss of PMS2 immunohistochemical expression. PMID: 25871621
  30. Information was collected on 66 MLH1, 24 MSH2, and 6 PMS2 nucleotide variants reported to be associated with altered expression of at least one of these alternative transcripts. Many of these variants are reported as splicing mutations. PMID: 24989436
  31. Another MMR protein, PMS2, also displayed a decline in expression during later stages of transformation. PMID: 25215298
  32. Some uterine carcinosarcomas show loss of PMS2. PMID: 25083964
  33. Data indicate that 98 mismatch repair gene PMS2 families were ascertained from family cancer clinics, including a total of 2,548 family members and 377 proven mutation carriers. PMID: 25512458
  34. Large deletions in the PMS2 gene are the most frequent mutations found in Spanish Lynch syndrome families. PMID: 23837913
  35. MLH1 or PMS2 knockdown conferred TMZ resistance. In recurrent GBM tumors, the expression of MLH1 and PMS2 was reduced compared to primary tumors. PMID: 24259277
  36. Immunohistochemistry revealed loss of expression for MLH1, MSH2, MSH6, and PMS2 in 15%, 21%, 13%, and 15% of cases, respectively. A perfect association was found between MMR immunohistochemical analyses and MSI molecular investigation. PMID: 24643686
  37. This report specifically focuses on the protein expression profile and germline mutations of MSH6 and PMS2 genes in 50 Malaysian Lynch syndrome suspected patients. PMID: 24072394
  38. Promoter methylation of MLH1, PMS2, MSH2, and p16 is a phenomenon observed in advanced-stage HCCs. PMID: 24400091
  39. 3' deletions in the PMS2 gene are not associated with colon cancer. PMID: 23288611
  40. PMS2 expression in endometrial carcinoma was associated with BMI, however, a link between BMI and the maintenance of the DNA mismatch repair system is not supported. PMID: 24444820
  41. Data suggest that endometrial cancer can be screened by testing for tumor MLH1 methylation in individuals with MLH1 immunohistochemistry loss, and germline mutations exhibiting loss of MSH6, MSH2, or PMS2, or loss of MLH1/PMS2 with the absence of MLH1 methylation. PMID: 24323032
  42. Pathogenic PMS2 mutations were detected in 69% of patients harboring LS-associated tumors with loss of PMS2 expression. PMID: 23709753
  43. The role of co-existing germline P53 and PMS2 mutations in familial cancer syndrome development is under investigation. PMID: 23981578
  44. Data show no evidence for deleterious mutations in PMS2, suggesting that these findings are sufficient to exclude PMS2 as a gene for mutation testing in individuals with suspected LS based on tumoral loss of both MLH1 and PMS2 expression. PMID: 23017166
  45. hPMS2 directly binds to activated akt and induces hPMS2 degradation. PMID: 23499907
  46. Data indicate that c.137G>T and exon 10 deletion are founder mutations in the PMS2 gene. PMID: 22577899
  47. Seven samples in a Lynch syndrome cohort were identified with deletions in the 3' region of PMS2, including three previously reported samples with deletions of Exons 13-15 (two samples) and Exons 14-15. PMID: 23012243
  48. There is no evidence that the SNPs associated with colorectal cancer (CRC) in the general population are modifiers of the risk for MLH1, MSH2, MSH6, and PMS2 MMR gene mutation carriers overall. PMID: 23434150
  49. Deleterious PMS2 allele generated by recombination with crossover between PMS2 and PMS2CL is associated with colorectal tumors. PMID: 22585707
  50. Insertion of an SVA element, a nonautonomous retrotransposon, in PMS2 intron 7 is a novel cause of Lynch syndrome. PMID: 22461402

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Database Links

HGNC: 9122

OMIM: 276300

KEGG: hsa:107984056

STRING: 9606.ENSP00000265849

UniGene: Hs.632637

Involvement In Disease
Hereditary non-polyposis colorectal cancer 4 (HNPCC4); Mismatch repair cancer syndrome (MMRCS)
Protein Families
DNA mismatch repair MutL/HexB family
Subcellular Location
Nucleus.

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