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MADS-box gene evolution-structure and transcription patterns.

Bo Johansen1, Louise B Pedersen, Martin Skipper

  • 1Botanical Institute, University of Copenhagen, Gothersgade 140, Denmark. boj@bot.ku.dk

Molecular Phylogenetics and Evolution
|July 9, 2002
PubMed
Summary

This study analyzes MADS-box genes, revealing that A-, B-, and C-class genes are all transcribed in stamens and carpels. This finding challenges the current formulation of the ABC model for flower development.

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Area of Science:

  • Plant Molecular Biology
  • Evolutionary Biology
  • Genomics

Background:

  • MADS-box genes are crucial regulators of plant development.
  • The ABC model describes floral organ identity but its universality is debated.
  • Phylogenetic analysis provides insights into gene evolution and function.

Purpose of the Study:

  • To conduct a phylogenetic analysis of MIKC-type MADS-box genes.
  • To investigate the evolutionary patterns of MADS-box gene transcription.
  • To evaluate the ABC model of floral development based on gene expression data.

Main Methods:

  • Phylogenetic analysis of 198 MADS-box genes using 420 parsimony-informative characters.
  • Mapping of gene transcription patterns onto the phylogenetic tree.

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  • Examination of gene structure and conserved motifs.

    • Main Results:

    • Identified major monophyletic groups of MIKC genes, supported by conserved gene structure and motifs.
    • Genes transcribed in vegetative organs are basal, while floral development genes evolved later.
    • A-, B-, and C-class MADS-box genes are all transcribed in stamens and carpels.

    Conclusions:

    • The phylogenetic analysis supports previously identified MADS-box gene groups.
    • Gene transcription patterns suggest a later evolution of floral development genes.
    • The study's findings do not support the ABC model as currently formulated, particularly regarding gene expression in reproductive organs.