Related Experiment Video

Updated: Jul 13, 2026

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation
08:08

Chicken Recombinant Limbs Assay to Understand Morphogenesis, Patterning, and Early Steps in Cell Differentiation

Published on: January 12, 2022

Bone morphogenetic protein signaling in limb outgrowth and patterning

Benoît Robert1

  • 1Institut Pasteur, Unité de Recherche Associée 2578 Centre National de la Recherche Scientifique, 25 Rue du Dr Roux, 75724 Paris Cedex 15, France. brobert@pasteur.fr

Development, Growth & Differentiation
|July 31, 2007
PubMed

Insights

Bone morphogenetic proteins (BMPs) are crucial for limb development, influencing dorsal-ventral patterning and digit formation. Conditional mutagenesis in mice reveals their complex roles, overcoming early lethality issues.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Bone morphogenetic proteins (BMPs), part of the TGF-beta family, have complex roles in embryonic development.
  • Previous studies on BMP function in limb development were limited by early lethality in knockout mouse models.

Purpose of the Study:

  • To review the function of Bmp2, Bmp4, and Bmp7 in early mouse limb development using conditional mutagenesis.
  • To elucidate the roles of BMPs in limb bud dorsal-ventral polarization, apical ectodermal ridge (AER) induction, and digit development.

Main Methods:

  • Conditional mutagenesis utilizing Cre-loxP technology in mice.
  • Focus on specific BMP ligands (Bmp2, Bmp4, Bmp7) and their impact on limb formation.
  • Analysis restricted to initial phases of limb development and patterning.

Main Results:

  • Conditional mutagenesis provides insights into BMP functions previously obscured by lethality.
  • BMPs are critical for establishing dorsal-ventral polarity in the limb bud.
  • BMP signaling is involved in apical ectodermal ridge (AER) formation and subsequent digit patterning.

Conclusions:

  • The Cre-loxP system is a powerful tool for studying essential genes in mouse limb development.
  • BMPs play multifaceted roles in early limb patterning, including axis formation and digit specification.
  • Further research is needed to fully understand the intricate mechanisms and potential limitations of BMP signaling in limb development.

More Related Videos

Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay06:49

Analysis of Cell Differentiation, Morphogenesis, and Patterning During Chicken Embryogenesis Using the Soaked-Bead Assay

Published on: January 12, 2022

Grafting of Beads into Developing Chicken Embryo Limbs to Identify Signal Transduction Pathways Affecting Gene Expression11:48

Grafting of Beads into Developing Chicken Embryo Limbs to Identify Signal Transduction Pathways Affecting Gene Expression

Published on: January 17, 2016

Related Concept Videos

Hedgehog Signaling Pathway02:33

Hedgehog Signaling Pathway

The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during bone...
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Notch Signaling Pathway03:14

Notch Signaling Pathway

The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...