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RanGAP1 maintains chromosome stability in limb bud mesenchymal cells during bone development
Minjun Huang1, Bochong Chen2, Xiaoli Chen2
1Department of Spine Surgery, The Tenth Affiliated Hospital of Southern Medical University (Dongguan People's Hospital), Dongguan 523059, China; Department of Orthopaedics, Guangdong Provincial Key Laboratory of Bone and Joint Degeneration Diseases, Orthopedic Hospital of Guangdong Province, The Third Affiliated Hospital of Southern Medical University, Guangzhou 510630, China.
RanGAP1 is essential for bone development by maintaining chromosome stability in mesenchymal cells. Its loss causes embryonic lethality and skeletal defects due to chromosome missegregation and altered signaling.
Area of Science:
- Skeletal Biology
- Cell Biology
- Genetics
Background:
- Bone development requires precise cell proliferation and differentiation.
- Maintaining chromosomal stability is crucial during osteogenesis.
- Mechanisms ensuring chromosome stability in Prx1+ mesenchymal cells are unknown.
Purpose of the Study:
- To investigate the role of RanGAP1 in bone development.
- To determine the impact of RanGAP1 deficiency on chromosome stability in Prx1+ mesenchymal cells.
Main Methods:
- Generated RanGAP1 knockout mice.
- Analyzed bone development via histomorphology and immunostaining.
- Assessed chromosome instability using karyotyping and immunofluorescence.
- Investigated chromothripsis and gene expression using WGS, RNA-seq, and qPCR.
Main Results:
- RanGAP1 ablation led to embryonic lethality, severe skeletal dysplasia, and failed cranial vault formation.
- RanGAP1 deficiency inhibited mesenchymal stem cell differentiation.
- Loss of RanGAP1 caused chromosome missegregation and chromothripsis (chr. 1q, 14q).
- Chromothripsis disrupted key bone signaling pathways (WNT, Hedgehog, TGF-β/BMP, PI3K/AKT).
Conclusions:
- RanGAP1 is critical for skeletal development.
- RanGAP1 preserves chromosome stability in Prx1+ limb bud mesenchymal cells.
- Disruption of chromosome stability by RanGAP1 loss impairs bone formation.
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