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[Homeotic genes].

J A Lepesant1

  • 1Institut Jacques-Monod, Centre National de la Recherche Scientifique et Université Paris VII, France.

Reproduction, Nutrition, Development
|January 1, 1990
PubMed
Summary

Homeotic genes, crucial for embryonic development, specify segment identity in Drosophila and vertebrates. Their conserved homeobox sequences reveal shared evolutionary principles in body plan organization across diverse species.

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Area of Science:

  • Developmental Biology
  • Genetics
  • Evolutionary Biology

Context:

  • Homeotic genes control embryonic development and segment identity in Drosophila.
  • These genes are organized in complexes (ANT-C and BX-C) and expressed colinearly along the anterior-posterior axis.
  • Homeotic proteins contain a conserved homeobox DNA-binding motif.

Purpose:

  • To investigate the role of homeotic genes in Drosophila embryonic development.
  • To explore the phylogenetic conservation of homeobox genes in eukaryotes.
  • To compare the organization and expression patterns of homeotic genes in Drosophila and vertebrates.

Summary:

  • Homeotic genes in Drosophila specify segment identity, organized in ANT-C and BX-C complexes with colinear expression.
  • A conserved 60-amino acid homeobox motif allows these proteins to function as transcription factors.
  • Over fifty homeobox (Hox) genes have been identified in various eukaryotes, including mice and humans, often clustered and exhibiting colinear expression patterns.

Impact:

  • Reveals fundamental principles of embryonic organization conserved across arthropods and vertebrates.
  • Highlights the evolutionary significance of homeobox genes in establishing body plans.
  • Provides insights into the genetic basis of developmental processes and evolutionary relationships.

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