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Plastid-to-nucleus retrograde signaling
Ajit Nott1, Hou-Sung Jung, Shai Koussevitzky
1Plant Biology Laboratory and Howard Hughes Medical Institute, Salk Institute for Biological Studies, La Jolla, California 92037, USA. nott@salk.edu
Annual Review of Plant Biology
|May 4, 2006
Summary
Plant cells use retrograde signaling to communicate between organelles and the nucleus. This review details plastid-to-nucleus signaling pathways, including those involving Mg-ProtoporphyrinIX and gene expression.
Area of Science:
- Plant cell biology
- Molecular biology
- Genetics
Background:
- Plant cells possess genetic information in the nucleus, plastids, and mitochondria.
- Organelles communicate with the nucleus via retrograde signaling to regulate nuclear gene expression.
- Understanding this communication is crucial for plant development and function.
Purpose of the Study:
- To review current knowledge on plastid-to-nucleus retrograde signaling pathways.
- To highlight the known triggers and components of these signaling pathways.
- To identify gaps in understanding regarding signaling molecules and transcription factors.
Main Methods:
- Literature review of existing research on retrograde signaling.
- Synthesis of findings from genetic studies and biochemical analyses.
- Identification of key signaling pathways and their regulators.
Main Results:
- Multiple, partially redundant plastid-to-nucleus signaling pathways exist.
- The Mg-ProtoporphyrinIX buildup pathway is the best-characterized.
- Other pathways are linked to plastid gene expression and photosynthetic electron transport redox state.
Conclusions:
- Several components involved in retrograde signal generation have been identified.
- The signaling molecules and transcription factors regulating nuclear gene expression remain largely unknown.
- Further research is needed to elucidate the complete mechanisms of plastid-to-nucleus communication.