Document Detail

The evolutionary significance of placental interdigitation in mammalian reproduction: contributions from comparative studies.
MedLine Citation:
PMID:  22840298     Owner:  NLM     Status:  MEDLINE    
The placenta is fundamental to mammalian reproduction and is surprisingly diverse in gross morphology among species. Whether and how this diversity affects maternal investment and fetal growth is still poorly understood. Contrary to suggestions that highly invasive hemochorial placentation is beneficial to fetal development, recent comparative studies have revealed that interdigitation - the degree of contact between maternal and fetal tissues at the area of exchange - strongly influences fetal growth rates. Species with labyrinthine placentae give birth to neonates of similar size to those of species with villous or trabecular placentae but in less than half the time. These findings suggest that there might be tradeoffs between fetal growth rates (higher with greater interdigitation) and gestation time (shorter with greater interdigitation), in association with type of interdigitation. Such tradeoffs might be the results of maternal-offspring conflict over the allocation of maternal resources, with paternal genes favouring greater interdigitation and so higher fetal growth, and maternal genes responding by reducing gestation time. These results emphasize the role of interdigitation as a means to increase the surface area for exchange, and are consistent with within species studies demonstrating that a higher surface area for exchange is associated with heavier neonates. Further studies could investigate the role of other traits in the evolution of placental diversity and their impact on fetal development.
I Capellini
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Publication Detail:
Type:  Journal Article     Date:  2012-07-26
Journal Detail:
Title:  Placenta     Volume:  33     ISSN:  1532-3102     ISO Abbreviation:  Placenta     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-09-11     Completed Date:  2013-01-25     Revised Date:  2013-04-08    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  763-8     Citation Subset:  IM    
Copyright Information:
Copyright © 2012 Elsevier Ltd. All rights reserved.
Department of Biological Sciences, University of Hull, Cottingham Road, Hull HU6 7RX, UK.
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MeSH Terms
Fetal Development / genetics
Maternal-Fetal Exchange / genetics*
Placenta / growth & development*
Placental Circulation / genetics
Placentation / genetics,  physiology*
Reproduction / genetics
Trophoblasts / cytology

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