期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 103, 期 41, 页码 15108-15112出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0607050103
关键词
cytoplasmic poly(A) polymerase; RNA regulation; mitosis/meiosis decision
资金
- NIGMS NIH HHS [R01 GM069454, R37 GM031892, R01 GM050942] Funding Source: Medline
mRNA regulation is crucial for many aspects of metazoan development and physiology, including regulation of stem cells and synaptic plasticity. In the nematode germ line, RNA regulators control stem cell maintenance, the sperm/oocyte decision, and progression through meiosis. Of particular importance to this work are three GLD (germ-line development) regulatory proteins, each of which promotes entry into the meiotic cell cycle: GILD-1 is a STAR/Quaking translational repressor, GLD-2 is a cytoplasmic poly(A) polymerase, and GLD-3 is a homolog of Bicaudal-C. Here we report that the gld-1 mRNA is a direct target of the GLD-2 poly(A) polymerase: polyadenylation of gld-1 mRNA depends on GLD-2, the abundance of GLD-1 protein is dependent on GLD-2, and the gld-1 mRNA coimmunoprecipitates with both GLD-2 and GLD-3 proteins. We suggest that the GLD-2 poly(A) polymerase enhances entry into the meiotic cell cycle at least in part by activating GILD-1 expression. The importance of this conclusion is twofold. First, the activation of gld-1 rnRNA by GLD-2 identifies a positive regulatory step that reinforces the decision to enter the meiotic cell cycle. Second, gld-1 mRNA is initially repressed by FBF (for fem-3 binding factor) to maintain stem cells but then becomes activated by the GLD-2 poly(A) polymerase once stem cells begin to make the transition into the meiotic cell cycle. Therefore, a molecular switch regulates gld-1 mRNA activity to accomplish the transition from mitosis to meiosis.
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