Document Detail

Phylogenetic evidence for early hemochorial placentation in eutheria.
MedLine Citation:
PMID:  19800685     Owner:  NLM     Status:  MEDLINE    
The eutherian placenta is remarkable for its structural and functional variability. In order to construct and test comparative hypotheses relating ecological, behavioral and physiological traits to placental characteristics it is first necessary to reconstruct the historical course of placental evolution. Previous attempts to do so have yielded inconsistent results, particularly with respect to the early evolution of structural relationships between fetal and maternal circulatory systems. Here, we bring a battery of phylogenetic methods - including parsimony, likelihood and Bayesian approaches - to bear on the question of placental evolution. All of these approaches are consistent in indicating that highly invasive hemochorial placentation, as found in human beings and numerous other taxa, was an early evolutionary innovation present in the most ancient ancestors of the living placental mammals.
M G Elliot; B J Crespi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-10-02
Journal Detail:
Title:  Placenta     Volume:  30     ISSN:  1532-3102     ISO Abbreviation:  Placenta     Publication Date:  2009 Nov 
Date Detail:
Created Date:  2009-11-02     Completed Date:  2010-01-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  949-67     Citation Subset:  IM    
Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6.
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MeSH Terms
Bayes Theorem
Likelihood Functions
Mammals / genetics*
Placenta / physiology
Placentation / genetics,  physiology*

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