Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 99, Issue 13, Pages 8772-8777Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.132275999
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Funding
- NIAMS NIH HHS [R01 AR045113, R01AR45113, R01AR45203, R01 AR045203] Funding Source: Medline
- NIGMS NIH HHS [R01 GM026210, R01GM26210] Funding Source: Medline
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Gene amplification is a common form of genomic instability in a wide variety of organisms and is often associated with tumor progression in mammals. One striking feature of many amplified genes is their organization as large inverted duplications (palindromes). Here, we describe a molecular mechanism for palindrome formation in mammalian cells that is also conserved in protists. We introduced a short (79 or 229 bp) inverted repeat into the genome of Chinese hamster ovary cells and showed that it promoted the formation of a large DNA palindrome after an adjacent DNA double-strand break. This finding suggests that short inverted repeats in the mammalian genome can have a critical role in the initiation of gene amplification. This specific mechanism may provide a novel target for cancer therapies.
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