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Network Analysis Implicates Alpha-Synuclein (Snca) in the Regulation of Ovariectomy-Induced Bone Loss
Gina Calabrese1, Larry D Mesner1, Patricia L Foley2
1Center for Public Health Genomics, University of Virginia, Charlottesville, Virginia 22908, USA.
Abstract:
The postmenopausal period in women is associated with decreased circulating estrogen levels, which accelerate bone loss and increase the risk of fracture. Here, we gained novel insight into the molecular mechanisms mediating bone loss in ovariectomized (OVX) mice, a model of human menopause, using co-expression network analysis. Specifically, we generated a co-expression network consisting of 53 gene modules using expression profiles from intact and OVX mice from a panel of inbred strains. The expression of four modules was altered by OVX, including module 23 whose expression was decreased by OVX across all strains. Module 23 was enriched for genes involved in the response to oxidative stress, a process known to be involved in OVX-induced bone loss. Additionally, module 23 homologs were co-expressed in human bone marrow. Alpha synuclein (Snca) was one of the most highly connected "hub" genes in module 23. We characterized mice deficient in Snca and observed a 40% reduction in OVX-induced bone loss. Furthermore, protection was associated with the altered expression of specific network modules, including module 23. In summary, the results of this study suggest that Snca regulates bone network homeostasis and ovariectomy-induced bone loss.
Insights
Alpha synuclein (Snca) deficiency significantly reduces bone loss in ovariectomized mice, revealing its role in postmenopausal osteoporosis and bone network regulation.
Area of Science:
- Bone biology
- Genomics
- Postmenopausal health
Background:
- Postmenopause is linked to estrogen decline, accelerating bone loss and fracture risk.
- Ovariectomized (OVX) mice model human menopause-induced bone loss.
- Molecular mechanisms of OVX-induced bone loss require further elucidation.
Purpose of the Study:
- To investigate molecular mechanisms of bone loss in OVX mice using co-expression network analysis.
- To identify key genes and pathways involved in OVX-induced bone loss.
- To explore the role of Alpha synuclein (Snca) in bone homeostasis.
Main Methods:
- Generated a co-expression network of 53 gene modules from intact and OVX mouse expression profiles.
- Analyzed gene expression changes across different inbred strains.
- Utilized gene enrichment analysis and identified hub genes.
- Characterized Alpha synuclein (Snca) knockout mice for bone loss phenotype.
Main Results:
- OVX altered the expression of four gene modules, including module 23, which decreased across all strains.
- Module 23 was enriched for oxidative stress response genes, implicated in OVX bone loss.
- Alpha synuclein (Snca) was identified as a key hub gene in module 23.
- Snca-deficient mice showed a 40% reduction in OVX-induced bone loss, linked to altered module expression.
Conclusions:
- Alpha synuclein (Snca) plays a regulatory role in bone network homeostasis.
- Snca deficiency protects against ovariectomy-induced bone loss.
- Targeting Snca may offer a therapeutic strategy for postmenopausal osteoporosis.
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