Posttranscriptional gene silencing in Neurospora by a RecQ DNA helicase.
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.[1]References
- Posttranscriptional gene silencing in Neurospora by a RecQ DNA helicase. Cogoni, C., Macino, G. Science (1999) [Pubmed]
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