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Related Experiment Video

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

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

Published on: January 12, 2022

Negative Smad expression and regulation in the developing chick limb.

Neil Vargesson¹, Ed Laufer

¹Department of Genetics and Development, Columbia University, New York, New York, United States of America.

|April 9, 2009

Summary

Negative Smads, crucial for blocking TGF-beta superfamily signals, were cloned in chicks. Their expression in developing limbs is regulated by Bone Morphogenetic Protein (BMP) signaling pathways.

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

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

Published on: January 17, 2016

Area of Science:

Developmental Biology
Molecular Biology
Cell Signaling

Background:

Transforming Growth Factor-beta (TGF-beta) superfamily signals are critical for development.
Negative Smad proteins (Smad6, Smad7) act as intracellular antagonists for TGF-beta and Bone Morphogenetic Protein (BMP) signaling pathways.
Understanding the role of negative Smads in limb development is essential for deciphering signaling network regulation.

Purpose of the Study:

To clone chick homologs of Smad6 and Smad7 (Smad7a, Smad7b).
To investigate the expression patterns of Smad6 and Smad7a in the developing chick limb.
To determine the regulation of negative Smad gene expression by BMP signaling.

Main Methods:

Cloning of chick Smad6, Smad7a, and Smad7b genes.
Analysis of Smad6 and Smad7a expression patterns during chick limb development using techniques like in situ hybridization.
Experimental manipulation of BMP signaling pathways (activation and inhibition) in limb mesenchyme to assess Smad gene regulation.

Main Results:

One Smad6 and two Smad7 (Smad7a, Smad7b) chick homologs were successfully cloned.
Smad6 and Smad7a exhibited dynamic expression patterns within the developing limb, correlating with known BMP gene expression domains.
BMP signaling pathway activation and inhibition experiments demonstrated that BMP family signals regulate, at least partially, the expression of negative Smad genes.

Conclusions:

Chick Smad6 and Smad7a are expressed in limb development in patterns consistent with their roles in BMP signaling.
Negative Smad gene expression in limb mesenchyme is, in part, controlled by BMP signaling.
These findings provide insights into the intricate regulation of TGF-beta superfamily signaling during vertebrate limb development.