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Ryanodine receptor type 3: why another ryanodine receptor isoform?
1Molecular Medicine Section, Department of Neuroscience,University of Siena, via Aldo Moro 5, 53100, Italy. v.sorrentino@unisi.it
Frontiers in Bioscience : a Journal and Virtual Library
|November 29, 2002
Summary
Ryanodine receptor (RyR) genes encode Ca2+ release channels. Co-expression of RyR1, RyR2, and RyR3 isoforms in various cells provides specialized calcium signaling machinery for cell-specific functions.
Area of Science:
- Molecular Biology
- Cellular Physiology
- Genetics
Background:
- Ryanodine receptors (RyRs) are Ca2+ release channels crucial for muscle function.
- RyR1 and RyR2 were primarily known for expression in skeletal and cardiac muscles.
- RyR3, along with RyR1 and RyR2, exhibits broader expression patterns across various cell types.
Purpose of the Study:
- To review published research on the RyR3 gene.
- To explore the co-expression of different RyR isoforms in vertebrate cells.
- To propose a model for the functional significance of RyR isoform co-expression.
Main Methods:
- Literature review of studies on RyR genes and their expression.
- Analysis of expression patterns of RyR1, RyR2, and RyR3 isoforms.
- Model development based on existing data.
Main Results:
- RyR3 is widely expressed, not restricted to specific tissues.
- RyR1 and RyR2 also show expression in non-muscle cells, albeit at lower levels.
- Co-expression of two or three RyR isoforms is common in vertebrate cells.
Conclusions:
- Co-expression of RyR isoforms is an evolutionary strategy.
- Functional interactions between RyR isoforms create cell-specific Ca2+ release machinery.
- This machinery enables sophisticated intracellular Ca2+ signaling for diverse cellular functions.