Conceptus Coats of Marsupials and Monotremes

Current Topics in Developmental Biology
Stephen Frankenberg, Marilyn B Renfree

Abstract

Mammals evolved from oviparous reptiles that laid eggs in a dry, terrestrial environment, thus requiring large amounts of yolk to support development and tough, outer coats to protect them. Eutherian mammals such as humans and mice exhibit an "extreme" form of viviparity in which yolk and conceptus coats have become largely redundant. However, the "other" mammals-monotremes and marsupials-have retained and modified some features of reptilian development that provide valuable insights into the evolution of viviparity in mammals. Most striking of these are the conceptus coats, which include the zona pellucida, the mucoid coat, and the shell coat. We discuss current knowledge of these coats in monotremes and marsupials, their possible roles, and recently identified components such as the zona pellucida protein ZPAX, conceptus coat mucin (CCM), and nephronectin (NPNT).

Citations

Oct 22, 2019·Molecular Biology and Evolution·Xuzhe ZhangLouis J Muglia
Jun 12, 2020·Integrative and Comparative Biology·Daniel J Stadtmauer, Günter P Wagner
Feb 5, 2021·Frontiers in Cell and Developmental Biology·Mª José Izquierdo-RicoManuel Avilés
Apr 4, 2021·International Journal of Molecular Sciences·Carla Moros-NicolásMª José Izquierdo-Rico
Nov 11, 2021·Seminars in Cell & Developmental Biology·Mathieu Le Verge-Serandour, Hervé Turlier

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