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lüll Genes and signals regulating murine trophoblast cell development El-Hashash AH; Warburton D; Kimber SJMech Dev 2010[Jan]; 127 (1-2): 1-20A fundamental step in embryonic development is cell differentiation whereby highly specialised cell types are developed from a single undifferentiated, fertilised egg. One of the earliest lineages to form in the mammalian conceptus is the trophoblast, which contributes exclusively to the extraembryonic structures that form the placenta. Trophoblast giant cells (TGCs) in the rodent placenta form the outermost layer of the extraembryonic compartment, establish direct contact with maternal cells, and produce a number of pregnancy-specific cytokine hormones. Giant cells differentiate from proliferative trophoblasts as they exit the cell cycle and enter a genome-amplifying endocycle. Normal differentiation of secondary TGCs is a critical step toward the formation of the placenta and normal embryonic development. Trophoblast development is also of particular interest to the developmental biologist and immunobiologist, as these cells constitute the immediate cellular boundary between the embryonic and maternal tissues. Abnormalities in the development of secondary TGCs results in severe malfunction of the placenta. Herein we review new information that has been accumulated recently regarding the molecular and cellular regulation of trophoblast and placenta development. In particular, we discuss the molecular aspects of murine TGC differentiation. We also focus on the role of growth and transcription factors in TGC development.|*Gene Expression Regulation, Developmental[MESH]|Actins/metabolism[MESH]|Animals[MESH]|Cell Cycle[MESH]|Cell Differentiation[MESH]|Cell Lineage[MESH]|Cytoskeleton/metabolism[MESH]|Developmental Biology/methods[MESH]|Female[MESH]|Mice[MESH]|Placenta/*metabolism[MESH]|Pregnancy[MESH]|Signal Transduction[MESH]|Transcription Factors[MESH]|Trophoblasts/*physiology[MESH] |