Skip to main content
Premium Trial:

Request an Annual Quote

Genome Technology s Peer Review: A Weekly Forum of Recently Published Journal Articles: May 17, 2005

NEW YORK, May 17 (GenomeWeb News) - Following is a description of two recently published research papers recommended by a scientist involved in integrated biology. The recommender, Shiv Grewal, is a senior investigator at the NCI's Center for Cancer Research.

 

For a complete list of recommended papers, read Genome Technology, a GenomeWeb News sister publication.


RNA Polymerase IV Directs Silencing of Endogenous DNA Herr AJ, JensenMB, Dalmay T, BaulcombeDCScience. 2005 Feb 24.

 

Plant Nuclear RNA Polymerase IV Mediates siRNA and DNA Methylation-Dependent Heterochromatin Formation
Onodera Y, Haag J, Ream T, Costa Nunes P, Pontes O, Pikaard C. Cell. 2005 March 11; 120, 613-622.

 

These two papers address a plant-specific RNA polymerase known as Pol IV (all eukaryotes have three nuclear DNA-dependent RNA polymerases, namely, Pol I, II, and III). In the Science paper, researchers at the Sainsbury Laboratory of the John Innes Centre in Norwich, UK, show how Pol IV silences certain transposons and repetitive DNA in a short interfering RNA pathway involving RNA-dependent RNA polymerase 2 and Dicer-Like 3. The authors conclude that the existence of this distinct silencing polymerase may explain the involvement of an RNA silencing pathway in the maintenance of transcriptional silencing.

 

In the Cell paper, corresponding author Craig Pikaard, a biologist at WashingtonUniversityin St. Louis, writes that the data in the paper suggest that Pol IV helps produce siRNAs that target de novo cytosine methylation events required for facultative heterochromatin formation and higher-order heterochromatin associations.

 

Shiv Grewalat NCI adds that the results presented in these papers are important for RNAi researchers because they suggest that low-level transcription of transposable elements by RNA polymerase might be essential for generating small interfering RNAs, which then help target heterochromatin complexes.

The Scan

Mosquitos Genetically Modified to Prevent Malaria Spread

A gene drive approach could be used to render mosquitos unable to spread malaria, researchers report in Science Advances.

Gut Microbiomes Allow Bears to Grow to Similar Sizes Despite Differing Diets

Researchers in Scientific Reports find that the makeup of brown bears' gut microbiomes allows them to reach similar sizes even when feasting on different foods.

Finding Safe Harbor in the Human Genome

In Genome Biology, researchers present a new approach to identify genomic safe harbors where transgenes can be expressed without affecting host cell function.

New Data Point to Nuanced Relationship Between Major Depression, Bipolar Disorder

Lund University researchers in JAMA Psychiatry uncover overlapping genetic liabilities for major depression and bipolar disorder.