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Hedgehog Signaling Pathway

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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...

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Gastrulation

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Analyzing Craniofacial Morphogenesis in Zebrafish Using 4D Confocal Microscopy

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[Hox-cluster and evolution of morphogeneses].

N M Korchagina, N I Bakalenko, M A Kulakova

|November 11, 2010

Summary

Key developmental genes (transcription factors) evolved early in animal history, predating the split of major animal groups. The Hox-cluster, crucial for body plan development, emerged later, enabling the diversity seen in bilateral animals.

Area of Science:

Evolutionary developmental biology
Comparative genomics
Metazoan evolution

Context:

Transcription factors are critical regulators of gene expression.
Hox-cluster genes play a fundamental role in establishing the body plan.
Lower Metazoa provide insights into early animal evolution.

Purpose:

To investigate the evolutionary origins of transcription factors in Metazoa.
To understand the emergence and role of the Hox-cluster in animal development.
To correlate the evolution of developmental gene regulation with animal diversification.

Summary:

Comparative genomic studies reveal that many transcription factors essential for bilateral animal development predated the divergence of major animal lineages.
The Hox-cluster genes originated in the last common ancestor of Cnidaria and Bilateria.

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Subsequent structural refinement of Hox-cluster regulatory mechanisms occurred during the morphogenesis of modern bilateral animals.

Impact:

The evolution and utilization of the Hox-cluster as a regulatory tool contributed significantly to the extensive speciation and diversity observed in Bilateria.
Understanding these ancient regulatory mechanisms provides a framework for studying developmental evolution across the animal kingdom.