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The phenomenon of posttranscriptional gene silencing (PTGS), which occurs when a transgene is introduced into a cell, is poorly understood. Here, the qde-3 gene, which is required for the activation and maintenance of gene silencing in the fungus Neurospora crassa, was isolated. Sequence analysis revealed that the qde-3 gene belongs to the RecQ DNA helicase family. The QDE3 protein may function in the DNA-DNA interaction between introduced transgenes or with an endogenous gene required for gene-silencing activation. In animals, genes that are homologous to RecQ protein, such as the human genes for Bloom's syndrome and Werner's syndrome, may also function in PTGS.
Cogoni et al. (Fri,) studied this question.
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