, Volume 662, Issue 1, pp 99–106 | Cite as

Molecular evolution of the membrane associated progesterone receptor in the Brachionus plicatilis (Rotifera, Monogononta) species complex

  • Hilary A. Smith
  • David B. Mark Welch
  • Terry W. Snell


Many studies have investigated physiological roles of the membrane associated progesterone receptor (MAPR), but little is known of its evolution. Marked variations in response to exogenous progesterone have been reported for four brachionid rotifer species, suggesting differences in progesterone signaling and reception. Here we report sequence variation for the MAPR gene in the Brachionus plicatilis species complex. Phylogenetic analysis of this receptor is compared with relatedness based on cytochrome c oxidase subunit 1 sequences. Nonsynonymous to synonymous site substitution rate ratios, amino acid divergence, and variations in predicted phosphorylation sites are examined to assess evolution of the MAPR among brachionid clades.


dN/dS Gene tree PGRMC1 Protein structure Signaling Substitution 



National Science Foundation grant BE/GenEn MCB-0412674E to TWS and DMW, and an NSF IGERT fellowship to HAS under DGE 0114400, supported this study. E. García-Roger provided subcultures of B. rotundiformis and B. plicatilis s.s. of Spain. B. Hecox-Lea did 5′-RACE. T. Shearer gave advice. Comments by R.L. Wallace, M. Serra, and two anonymous reviewers improved this manuscript.


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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Hilary A. Smith
    • 1
  • David B. Mark Welch
    • 2
  • Terry W. Snell
    • 1
  1. 1.School of BiologyGeorgia Institute of TechnologyAtlantaUSA
  2. 2.Marine Biological LaboratoryJosephine Bay Paul Center for Comparative Molecular Biology and EvolutionWoods HoleUSA

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