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Many amplified genes, including some oncogenes, are organized as large inverted repeats. How such giant palindromes are generated remains largely unknown. Recent studies of a palindrome in the ciliate Tetrahymena suggest a novel mechanism that requires chromosome breakage next to short inverted repeats. The prevalence of short inverted repeats in eukaryotic genomes raises the interesting possibility...
During Tetrahymena conjugation, programmed DNA degradation occurs in two separate nuclei. Thousands of germline-specific deletion elements are removed from the genome of the developing somatic macronucleus, and the old parental macronucleus is degraded by an apoptotic mechanism. An abundant polypeptide, Pdd1p (formerly p65), localizes to both of these nuclei at the time of DNA degradation. Here we...
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