Pre-gastrula Development of Non-eutherian Mammals

Current Topics in Developmental Biology
Stephen Frankenberg

Abstract

Marsupials and monotremes differ from eutherian mammals in many features of their reproduction and development. Some features appear to be representative of transitional stages in evolution from therapsid reptiles to humans and mice, particularly with respect to the extraembryonic tissues that have undergone remarkable modifications to accommodate reduced egg size and quantity of yolk/deutoplasm, and increasing emphasis on viviparity and placentation. Trophoblast and hypoblast contribute the epithelial layers in most of the extraembryonic membranes and are the first two lineages to differentiate from the embryonic lineage. How they are specified varies greatly among mammals, perhaps largely due to heterochrony in the stage at which they must function. Differences probably also exist in the stage at which lineages are specified relative to the stage at which they fully commit to differentiation. The dogma of sequential commitment to trophoblast and hypoblast with progressive loss of potency may not be a fundamental feature of early mammalian development, but merely a recently acquired developmental pattern in eutherians, or at least mice.

Citations

Oct 22, 2019·Molecular Biology and Evolution·Xuzhe ZhangLouis J Muglia
Jul 24, 2020·Development·Berenika Płusa, Anna Piliszek
Oct 7, 2020·Annual Review of Cell and Developmental Biology·Claudia GerriKathy K Niakan
Jul 13, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Matthias StöckYann Guiguen
Nov 11, 2021·Seminars in Cell & Developmental Biology·Mathieu Le Verge-Serandour, Hervé Turlier

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