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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Related Experiment Video

Updated: Aug 7, 2025

Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay
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RAB23 regulates musculoskeletal development and patterning.

Md Rakibul Hasan1, Anna Koskenranta1, Kirsi Alakurtti1

  • 1Orthodontics, Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland.

Frontiers in Cell and Developmental Biology
|March 13, 2023
PubMed
Summary
This summary is machine-generated.

RAB23 protein is essential for patella bone formation and tendon development. Loss of RAB23 disrupts skeletal patterning and TGFβ-BMP signaling, impacting knee joint formation.

Keywords:
GLI1RAB23TGFβ2kneepatellascleraxistenogenesis

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Area of Science:

  • Skeletal Biology
  • Developmental Biology
  • Molecular Genetics

Background:

  • RAB23, a small GTPase, regulates growth factor signaling at the plasma membrane.
  • Mutations in RAB23 cause Carpenter syndrome, affecting organogenesis and patterning.
  • The patella is crucial for knee function, formed by specific chondroprogenitor cells.

Purpose of the Study:

  • Investigate RAB23's role in musculoskeletal development.
  • Determine RAB23's necessity for patella bone and tendon progenitor formation.
  • Elucidate RAB23's impact on signaling pathways regulating skeletal development.

Main Methods:

  • Analysis of a mouse model lacking functional RAB23 (Rab23-/- mice).
  • Gene expression analysis of key developmental markers (SOX9, scleraxis, GLI1).
  • Assessment of TGFβ-BMP signaling pathway components (TGFβR2, BMPR1, BMP4, pSmad).

Main Results:

  • Rab23-/- mice exhibit a complete absence of the patella and abnormal knee joint formation.
  • SOX9 and scleraxis expression is disrupted, leading to abnormal or lost quadriceps tendons, cruciate ligaments, and entheses.
  • Key TGFβ-BMP signaling components and GLI1 are downregulated in Rab23-/- mice, suggesting a link between RAB23 and this pathway.

Conclusions:

  • RAB23 is indispensable for patella chondroprogenitor specification and subsequent patellofemoral joint development.
  • RAB23 is required for the maintenance of tendon progenitors and entheses formation.
  • RAB23 likely plays a critical role in regulating TGFβ superfamily signaling during skeletal development.