The core transcriptome of mammalian placentas and the divergence of expression with placental shape.

Placenta

Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL, USA; Great Ape Trust/Bonobo Hope Sanctuary, Des Moines, IA, USA; Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA. Electronic address:

Published: September 2017

Introduction: The placenta is arguably the most anatomically variable organ in mammals even though its primary function is conserved.

Method: Using RNA-Seq, we measured the expression profiles of 55 term placentas of 14 species of mammals representing all major eutherian superordinal clades and marsupials, and compared the evolution of expression across clades.

Results: We identified a set of 115 core genes which is expressed (FPKM ≥10) in all eutherian placentas, including genes with immune-modulating properties (ANXA2, ANXA1, S100A11, S100A10, and LGALS1), cell-cell interactions (LAMC1, LUM, and LGALS1), invasion (GRB2 and RALB) and syncytialization (ANXA5 and ANXA1). We also identified multiple pre-eclampsia associated genes which are differentially expressed in Homo sapiens when compared to the other 13 species. Multiple genes are significantly associated with placenta morphology, including EREG and WNT5A which are both associated with placental shape.

Discussion: 115 genes are important for the core functions of the placenta in all eutherian species analyzed. The molecular functions and pathways enriched in the core placenta align with the evolutionarily conserved functionality of the placenta.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5592967PMC
http://dx.doi.org/10.1016/j.placenta.2017.04.015DOI Listing

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