Journal of Molecular Evolution

, Volume 60, Issue 5, pp 577–586

Explosive Lineage-Specific Expansion of the Orphan Nuclear Receptor HNF4 in Nematodes

  • Marc Robinson-Rechavi
  • Claude V. Maina
  • Chris R. Gissendanner
  • Vincent Laudet
  • Ann Sluder
Article

DOI: 10.1007/s00239-004-0175-8

Cite this article as:
Robinson-Rechavi, M., Maina, C.V., Gissendanner, C.R. et al. J Mol Evol (2005) 60: 577. doi:10.1007/s00239-004-0175-8

Abstract

The nuclear receptor superfamily expanded in at least two episodes: one early in metazoan evolution, the second within the vertebrate lineage. An exception to this pattern is the genome of the nematode Caenorhabditis elegans, which encodes more than 270 nuclear receptors, most of them highly divergent. We generated 128 cDNA sequences for 76 C. elegans nuclear receptors, confirming that these are active genes. Among these numerous receptors are 13 orthologues of nuclear receptors found in arthropods and/or vertebrates. We show that the supplementary nuclear receptors (supnrs) originated from an explosive burst of duplications of a unique orphan receptor, HNF4. This origin has specific implications for the role of ligand binding in the function and evolution of the nematode supplementary nuclear receptors. Moreover, the supplementary nuclear receptors include a group of very rapidly evolving genes found primarily on chromosome V. We propose a model of lineage-specific duplications from a chromosome on which duplication and substitution rates are highly increased. Our results provide a framework to study nuclear receptors in nematodes, as well as to consider the functional and evolutionary consequences of lineage-specific duplications.

Keywords

DevelopmentDuplicationEndocrinologyEvolutionary ratesPhylogenyTranscription factors

Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Marc Robinson-Rechavi
    • 1
    • 4
  • Claude V. Maina
    • 2
  • Chris R. Gissendanner
    • 2
    • 5
  • Vincent Laudet
    • 1
  • Ann Sluder
    • 3
  1. 1.Laboratoire de Biologie Moléculaire de la Cellule, UMR CNRS 5161Ecole Normale Supérieure de Lyoncedex 07France
  2. 2.New England Biolabs Inc.BeverlyUSA
  3. 3.Cambria Biosciences LLCWoburnUSA
  4. 4.Joint Center for Structural GenomicsLa JollaUSA
  5. 5.Department of BiologyThe University of Louisiana at MonroeMonroeUSA