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Updated: Aug 5, 2026
Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model
Published on: July 3, 2020
Integrative Analysis Coupled with In Vitro Validation Reveals KAZN and SUPT3H as Shared Negative Regulators in
Jiacong Hong1,2, Xiaoyan Zhang2, Ganggang Kong2
1School of Basic Medical Sciences, Henan Medical University, Xinxiang 453003, China.
Abstract:
Osteosarcopenia, which is the coexistence of sarcopenia and osteoporosis, is being increasingly recognized as a systemic musculoskeletal aging syndrome. However, shared molecular regulators of bone-muscle deterioration remain unclear. In this study, we integrated bulk transcriptomic datasets from sarcopenic skeletal muscle and osteoporosis peripheral blood mononuclear cells to identify shared differentially expressed genes, followed by two-sample Mendelian randomization using osteoporosis genome-wide association study summary statistics to prioritize genes with potential causal relevance. Furthermore, diagnostic performance, functional enrichment, immune infiltration, single-cell RNA sequencing, regulatory network reconstruction, compound prediction, and siRNA-mediated validation were conducted in C2C12 and MC3T3-E1 cells. Overall, 122 shared differentially expressed genes were preliminarily screened, and KAZN and SUPT3H were tentatively proposed as candidate genes genetically associated with osteoporosis risk. Both genes were upregulated in the disease groups and exhibited weak to modest diagnostic performance. Furthermore, Kazn or Supt3h knockdown promoted myogenic differentiation in C2C12 cells as well as osteogenic differentiation and mineralization in MC3T3-E1 cells, supporting their roles as negative regulators of lineage differentiation. Moreover, functional analyses linked KAZN mainly to mitochondrial-related programs and SUPT3H to immune signaling, whereas single-cell analyses localized these genes to stromal, progenitor, and immune-related compartments. These hypothesis-generating findings suggest that KAZN and SUPT3H participate in shared bone-muscle dysfunction and generate candidate genes and mechanistic hypotheses for subsequent functional validation and translational research.
Insights
Researchers identified KAZN and SUPT3H as potential shared regulators of osteosarcopenia, a condition combining osteoporosis and sarcopenia. Gene knockdown improved bone and muscle cell differentiation, suggesting these genes negatively impact bone and muscle health.
Area of Science:
- Musculoskeletal biology
- Aging research
- Molecular genetics
Background:
- Osteosarcopenia, the concurrent decline of bone and muscle mass, is a significant aging syndrome.
- Shared molecular mechanisms underlying osteosarcopenia remain largely unknown.
- Identifying these mechanisms is crucial for understanding and treating age-related musculoskeletal deterioration.
Purpose of the Study:
- To identify shared molecular regulators of bone and muscle aging.
- To investigate the causal relevance of candidate genes in osteoporosis.
- To explore the functional roles of identified genes in bone and muscle differentiation.
Main Methods:
- Integration of transcriptomic data from sarcopenic muscle and osteoporotic blood cells.
- Two-sample Mendelian randomization using GWAS summary statistics for osteoporosis.
- In vitro validation using C2C12 and MC3T3-E1 cells, including gene knockdown and functional assays.
- Single-cell RNA sequencing and regulatory network analysis.
Main Results:
- 122 shared differentially expressed genes were identified.
- KAZN and SUPT3H were proposed as candidate genes associated with osteoporosis risk.
- Knockdown of Kazn/Supt3h enhanced myogenic and osteogenic differentiation.
- KAZN was linked to mitochondrial pathways, SUPT3H to immune signaling.
Conclusions:
- KAZN and SUPT3H are implicated as negative regulators in shared bone-muscle dysfunction.
- These genes represent potential therapeutic targets for osteosarcopenia.
- Further research is warranted for functional validation and translational applications.
