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

Publication ,  Journal Article
Eshleman, JR; Markowitz, SD; Donover, PS; Lang, EZ; Lutterbaugh, JD; Li, GM; Longley, M; Modrich, P; Veigl, ML; Sedwick, WD
Published in: Oncogene
April 4, 1996

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 oncogenes and tumor suppressor genes.

Duke Scholars

Published In

Oncogene

ISSN

0950-9232

Publication Date

April 4, 1996

Volume

12

Issue

7

Start / End Page

1425 / 1432

Location

England

Related Subject Headings

  • RNA Splicing
  • Oncology & Carcinogenesis
  • Mutation
  • Molecular Sequence Data
  • Microsatellite Repeats
  • Hypoxanthine Phosphoribosyltransferase
  • Humans
  • DNA, Satellite
  • DNA Replication
  • DNA Repair
 

Citation

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MLA
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Eshleman, J. R., 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.
Eshleman, J. R., S. D. Markowitz, P. S. Donover, E. Z. Lang, J. D. Lutterbaugh, G. M. Li, M. Longley, P. Modrich, M. L. Veigl, and W. D. Sedwick. “Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability.Oncogene 12, no. 7 (April 4, 1996): 1425–32.
Eshleman JR, 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 Apr 4;12(7):1425–32.
Eshleman, J. R., et al. “Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability.Oncogene, vol. 12, no. 7, Apr. 1996, pp. 1425–32.
Eshleman JR, Markowitz SD, Donover PS, Lang EZ, Lutterbaugh JD, Li GM, Longley M, Modrich P, Veigl ML, Sedwick WD. Diverse hypermutability of multiple expressed sequence motifs present in a cancer with microsatellite instability. Oncogene. 1996 Apr 4;12(7):1425–1432.

Published In

Oncogene

ISSN

0950-9232

Publication Date

April 4, 1996

Volume

12

Issue

7

Start / End Page

1425 / 1432

Location

England

Related Subject Headings

  • RNA Splicing
  • Oncology & Carcinogenesis
  • Mutation
  • Molecular Sequence Data
  • Microsatellite Repeats
  • Hypoxanthine Phosphoribosyltransferase
  • Humans
  • DNA, Satellite
  • DNA Replication
  • DNA Repair