Elevated frequency of microsatellite mutations in TK6 human lymphoblast clones selected for mutations at the thymidine kinase locus.

Journal Article (Journal Article)

A major question in carcinogenesis is, How can a normal cell accumulate multiple mutations in different genes on different chromosomes, when the mutation rate of each gene is in the range of 10(-8) to 10(-5) per cell division? We hypothesize that many mutations may not be isolated events but rather are accompanied by concomitant mutations elsewhere in the genome. To test this hypothesis, 331 independent clones selected for new mutations at the thymidine kinase (TK) locus on chromosome 17q, and 243 nonselected control clones were examined for mutations in 12 random microsatellite loci dispersed throughout the genome. A total of 24 second-site mutations were identified in the TK mutant clones, compared with 3 in the control clones not selected for mutations at TK. The mutations include small deletions, insertions, and loss of heterozygosity. These results provide evidence that a global trans-acting mutagenic process exists in human cells. The activation of this process could be responsible for causing multiple essential mutations in tumor cells.

Full Text

Duke Authors

Cited Authors

  • Li, CY; Yandell, DW; Little, JB

Published Date

  • July 1994

Published In

Volume / Issue

  • 14 / 7

Start / End Page

  • 4373 - 4379

PubMed ID

  • 8007946

Pubmed Central ID

  • PMC358808

International Standard Serial Number (ISSN)

  • 0270-7306

Digital Object Identifier (DOI)

  • 10.1128/mcb.14.7.4373-4379.1994


  • eng

Conference Location

  • United States