Cbfβ: A key regulator in skeletal stem cell differentiation, bone development, and disease.

Area of Science:

• Skeletal Biology and Development
• Molecular and Cellular Biology
• Biochemistry

Background:

• The skeletal system relies on intricate regulation of bone and cartilage tissues by transcriptional factors and signaling molecules.
• Core-binding factor subunit beta (Cbfβ) is a crucial co-transcriptional factor stabilizing Runx proteins, essential for skeletal homeostasis.
• Cbfβ plays a key role in mesenchymal stem cell (MSC) lineage commitment and differentiation into osteoblasts and chondrocytes.

Purpose of the Study:

• To review recent advancements in understanding the structural and molecular functions of Cbfβ in skeletal development.
• To elucidate Cbfβ's interactions with critical signaling pathways (BMP/TGF-β, Wnt/β-catenin, Hippo/YAP, IHH/PTHrP).
• To highlight the therapeutic potential of Cbfβ for skeletal disorders.

Main Methods:

• Literature review synthesizing recent research on Cbfβ.
• Analysis of genetic mouse models demonstrating Cbfβ's role in skeletal development.
• Examination of Cbfβ's interactions with key signaling pathways and the Cbfβ/RUNX2 complex.

Main Results:

• Cbfβ deficiency leads to severe skeletal dysplasia, impacting both endochondral and intramembranous ossification.
• The Cbfβ/RUNX2 complex orchestrates essential gene expression programs for osteogenesis and cartilage development.
• Cbfβ interacts with BMP/TGF-β, Wnt/β-catenin, Hippo/YAP, and IHH/PTHrP signaling pathways.

Conclusions:

• Cbfβ is indispensable for precise regulation of skeletal development, remodeling, and repair.
• Cbfβ's function is integrated within multiple key signaling networks.
• Local delivery of Cbfβ presents a promising therapeutic strategy for skeletal disorders like cleidocranial dysplasia and osteoarthritis.