Related Experiment Video
Updated: Jun 29, 2026
A Novel RFP Reporter to Aid in the Visualization of the Eye Imaginal Disc in Drosophila
Published on: December 15, 2009
The Drosophila FMRP and LARK RNA-binding proteins function together to regulate eye development and circadian
Oyinkan Sofola1, Vasudha Sundram, Fanny Ng
1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA.
Abstract:
Fragile X syndrome (FXS) is the most common form of hereditary mental retardation. FXS patients have a deficit for the fragile X mental retardation protein (FMRP) that results in abnormal neuronal dendritic spine morphology and behavioral phenotypes, including sleep abnormalities. In a Drosophila model of FXS, flies lacking the dfmr1 protein (dFMRP) have abnormal circadian rhythms apparently as a result of altered clock output. In this study, we present biochemical and genetic evidence that dFMRP interacts with a known clock output component, the LARK RNA-binding protein. Our studies demonstrate physical interactions between dFMRP and LARK, that the two proteins are present in a complex in vivo, and that LARK promotes the stability of dFMRP. Furthermore, we show genetic interactions between the corresponding genes indicating that dFMRP and LARK function together to regulate eye development and circadian behavior.
Insights
Fragile X syndrome research reveals a key interaction between the fragile X mental retardation protein (FMRP) and LARK RNA-binding protein. This discovery sheds light on the molecular mechanisms underlying circadian rhythm and eye development in FXS models.
Area of Science:
- Neuroscience
- Genetics
- Chronobiology
Background:
- Fragile X syndrome (FXS) is the leading cause of inherited intellectual disability.
- FXS is characterized by a deficiency in fragile X mental retardation protein (FMRP), leading to abnormal neuronal development and behavioral issues like sleep disturbances.
- Drosophila models of FXS exhibit disrupted circadian rhythms due to altered clock output.
Purpose of the Study:
- To investigate the molecular interactions underlying circadian rhythm abnormalities in a Drosophila model of FXS.
- To identify potential protein partners of the Drosophila FMRP (dFMRP) involved in clock output regulation.
Main Methods:
- Biochemical assays to confirm physical interactions between dFMRP and LARK.
- In vivo studies to detect the presence of a dFMRP-LARK complex.
- Genetic interaction studies using Drosophila melanogaster to assess the functional relationship between dFMRP and LARK.
Main Results:
- Demonstrated physical interaction and complex formation between dFMRP and the LARK RNA-binding protein in vivo.
- Showed that LARK enhances the stability of dFMRP.
- Identified genetic interactions between dFMRP and LARK, indicating their collaborative role in regulating eye development and circadian behavior.
Conclusions:
- dFMRP interacts with the LARK RNA-binding protein, a known clock output component.
- LARK plays a role in stabilizing dFMRP, and they function together in regulating circadian behavior and eye development.
- This interaction provides new insights into the molecular basis of FXS-related phenotypes, particularly circadian rhythm disruptions.
