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Shaping animal body plans in development and evolution by modulation of Hox expression patterns
1Department of Biology, Yale University, New Haven, CT, USA.
Summary
Animal body plans share an ancient Hox gene blueprint. Mechanisms for establishing Hox gene expression vary, but maintenance relies on conserved gene interactions and regulatory elements, driving evolutionary diversity.
Area of Science:
- Developmental Biology
- Evolutionary Biology
- Genetics
Background:
- Animals display diverse anterior-posterior body axis morphology.
- Hox genes provide a conserved ancient blueprint underlying this diversity.
- Hox gene expression patterns are crucial for axial patterning.
Purpose of the Study:
- To investigate conserved and divergent mechanisms of Hox gene transcription establishment and maintenance across animal phyla.
- To explore the role of Hox gene regulation in the evolution of animal body plans.
Main Methods:
- Comparative analysis of Hox gene expression patterns in various vertebrate and invertebrate model systems.
- Examination of regulatory mechanisms including Pc and trx group genes, auto- and cross-regulation.
- Investigation of cis-regulatory element evolution and its impact on Hox gene clustering and function.
Main Results:
- Hox transcription establishment mechanisms are highly diverse, mirroring body plan variation.
- Hox expression pattern maintenance mechanisms are more conserved, involving Pc/trx genes and auto/cross-regulation.
- Regulatory element sharing in mice versus insulators in flies highlights distinct strategies for Hox gene regulation.
Conclusions:
- Evolutionary changes in Hox cis-regulatory elements are key drivers of novel body plan emergence.
- Understanding Hox gene regulation provides insights into the genetic basis of animal morphological evolution.