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Published on: October 27, 2008
The orphan G protein-coupled receptor 161 is required for left-right patterning
Tinchung Leung1, Jasper E Humbert, Anna M Stauffer
1Weis Center for Research, Geisinger Clinic, Danville, PA 17822, USA. tleung1@geisinger.edu
Developmental Biology
|August 30, 2008
Summary
Gpr161 (G protein-coupled receptor) is crucial for embryonic development in zebrafish. Its knockdown disrupts left-right patterning and heart development by affecting calcium levels in Kupffer's vesicle cells.
Area of Science:
- Developmental Biology
- Genetics
- Cellular Biology
Background:
- Gpr161 (RE2) is an orphan G protein-coupled receptor (GPCR) with unknown function.
- GPCRs play vital roles in embryonic development.
Purpose of the Study:
- To elucidate the biological function of Gpr161 during zebrafish embryonic development.
- To investigate the role of Gpr161 in left-right (L-R) patterning.
Main Methods:
- Targeted knockdown of gpr161 in zebrafish embryos.
- Analysis of asymmetric gene expression in the lateral plate mesoderm.
- Measurement of intracellular calcium (Ca2+) levels in Kupffer's vesicle.
- Rescue experiments using over-expression of ncx1 or pmca-RNA.
Main Results:
- Gpr161 knockdown disrupts asymmetric gene expression and causes aberrant heart tube looping.
- Cardiac looping defects in gpr161 knockdown embryos are associated with elevated Ca2+ levels in Kupffer's vesicle.
- Over-expression of ncx1 or pmca-RNA partially rescues the cardiac looping defect.
Conclusions:
- Gpr161 is essential for L-R patterning during zebrafish embryonic development.
- Gpr161 modulates Ca2+ levels in Kupffer's vesicle cells, influencing heart development.
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