Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability

James Eshleman, Sanford D. Markowitz, P. Scott Donover, Evan Z. Lang, James D. Lutterbaugh, Guo Min Li, Mathew Longley, Paul Modrich, Martina L. Veigl, W. David Sedwick

Research output: Contribution to journalArticle

Abstract

Colon cancer and an increasing number of other cancers have been found to exhibit instability of DNA microsatellite sequences. Such tumors have been designated as replication errors (RER) tumors. However, as microsatellites are only rarely found within coding regions of the genome, instability of these sequences cannot directly contribute to carcinogenesis. Recently, we have shown RER colon cancers also demonstrate a marked 100-fold increase in mutation rates measured within an expressed gene, hprt, suggesting the mutator phenotype in these tumors extends beyond microsatellite sequences. To determine whether the RER phenotype indeed destabilizes non-repetitive DNA sequences we have sequenced hprt gene mutations recovered from the RER colon cancer cell line RKO. Greater than 10% of hprt mutants proved to be a single 3 bp deletion located in a nonrepetitive ATTAT sequence motif. Additionally, 1-4 bp deletions or insertions were found to be randomly located throughout the hprt gene. Lastly, one third of hprt mutations proved to be transitions or transversions. The microsatellite instability demonstrated in RKO is thus a global mutator phenotype which destabilizes DNA sequences both inside and outside of repetitive sequence elements and which augments base substitutions as well as frameshifts. These findings extend the characteristics of mutations associated with RER tumors and suggest additional mechanisms by which mutator phenotypes may alter target oncogenes and tumor suppressor genes.

Original languageEnglish (US)
Pages (from-to)1425-1432
Number of pages8
JournalOncogene
Volume12
Issue number7
StatePublished - 1996
Externally publishedYes

Fingerprint

Microsatellite Instability
Colonic Neoplasms
Neoplasms
Phenotype
Microsatellite Repeats
Mutation
Genes
Genomic Instability
Nucleic Acid Repetitive Sequences
Mutation Rate
Tumor Suppressor Genes
Oncogenes
Carcinogenesis
Cell Line

Keywords

  • Colon cancer
  • Genomic instability
  • HPRT
  • Nucleic acid
  • Repetitive sequences
  • Replication errors (RER)

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

Cite this

Eshleman, J., Markowitz, S. D., Donover, P. S., Lang, E. Z., Lutterbaugh, J. D., Li, G. M., ... Sedwick, W. D. (1996). Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability. Oncogene, 12(7), 1425-1432.

Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability. / Eshleman, James; Markowitz, Sanford D.; Donover, P. Scott; Lang, Evan Z.; Lutterbaugh, James D.; Li, Guo Min; Longley, Mathew; Modrich, Paul; Veigl, Martina L.; Sedwick, W. David.

In: Oncogene, Vol. 12, No. 7, 1996, p. 1425-1432.

Research output: Contribution to journalArticle

Eshleman, J, Markowitz, SD, Donover, PS, Lang, EZ, Lutterbaugh, JD, Li, GM, Longley, M, Modrich, P, Veigl, ML & Sedwick, WD 1996, 'Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability', Oncogene, vol. 12, no. 7, pp. 1425-1432.
Eshleman J, Markowitz SD, Donover PS, Lang EZ, Lutterbaugh JD, Li GM et al. Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability. Oncogene. 1996;12(7):1425-1432.
Eshleman, James ; Markowitz, Sanford D. ; Donover, P. Scott ; Lang, Evan Z. ; Lutterbaugh, James D. ; Li, Guo Min ; Longley, Mathew ; Modrich, Paul ; Veigl, Martina L. ; Sedwick, W. David. / Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability. In: Oncogene. 1996 ; Vol. 12, No. 7. pp. 1425-1432.
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