Genes, Volume 12, Issue 5
2021 May - 178 articles
Cover Story: Passive diffusion drives maternal-fetal exchange across the placenta of all molecules and is a significant determinant of fetal growth. Passive permeability to hydrophilic molecules (e.g. ions, glucose, amino acids) is determined directly by the surface area for exchange and inversely by the thickness of the barrier, as well as the size of the molecule. The image shows a pseudo-coloured electron micrograph of the four-layer barrier between maternal blood spaces (upper left corner) and fetal capillaries (lower right corner) in the mouse placenta (from top to bottom, layers are: sinusoidal trophoblast giant cells, syncytiotrophoblast layer I, syncytiotrophoblast layer II and endothelium). In this issue, Angiolini et al. examine the morphology and in vivo transfer capacity of placentae in a mouse model deficient for the maternally expressed gene Phlda2, uncovering this imprinted gene as a key new regulator of placental passive permeability.
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