Abstract
Breakage-fusion-bridge cycles contribute to chromosome instability and generate large DNA palindromes that facilitate gene amplification in human cancers. The prevalence of large DNA palindromes in cancer is not known. Here, by using a new microarray-based approach called genome-wide analysis of palindrome formation, we show that palindromes occur frequently and are widespread in human cancers. Individual tumors seem to have a nonrandom distribution of palindromes in their genomes, and a subset of palindromic loci is associated with gene amplification. This indicates that the location of palindromes in the cancer genome can serve as a structural platform that supports subsequent gene amplification. Genome-wide analysis of palindrome formation is a new approach to identify structural chromosome aberrations associated with cancer.
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Acknowledgements
We thank J. Delrow and the Fred Hutchinson Cancer Research Center Genomics facility for advice on the array studies and P. Nieman, M. Groudine, B. Trask, C. Kemp, J. Radich, J. Roberts and members of the laboratory of M.-C.Y. for comments on the manuscripts. This work was supported by National Institutes of Health grants from General Medicine (M.-C.Y.) and National Institute of Arthritis, Musculoskeletal and Skin Diseases (S.J.T.) and by the Avon Breast Cancer Crusade Opportunity Fund (to H.T.). H.T. is a recipient of Interdisciplinary Dual Mentor Fellowship of Fred Hutchinson Cancer Research Center (1999 and 2001).
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Supplementary information
Supplementary Fig. 1
MYC is amplified in a large DNA palindrome in Colo320DM. (PDF 193 kb)
Supplementary Fig. 2
Restriction map for the ECM1 gene. (PDF 186 kb)
Supplementary Fig. 3
Cot-1 DNA suppresses hybridization of repetitive sequences. (PDF 155 kb)
Supplementary Table 1
GAPF-positive cytogenetic bands (q-value <0.05 and positive fold-change) in Colo320DM, MCF7, RD and medulloblastomas, and GAPF-positive 5MB bins in Colo320DM and MCF7. (PDF 133 kb)
Supplementary Table 2
GAPF features of genes in three GAPF-positive cytogenetic bands (8q24.1, 1q21 and 7q35) in Colo and MCF7. (PDF 298 kb)
Supplementary Table 3
GAPF-positive genes. (PDF 78 kb)
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Tanaka, H., Bergstrom, D., Yao, MC. et al. Widespread and nonrandom distribution of DNA palindromes in cancer cells provides a structural platform for subsequent gene amplification. Nat Genet 37, 320–327 (2005). https://doi.org/10.1038/ng1515
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DOI: https://doi.org/10.1038/ng1515
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