期刊
NUTRITION AND PHYSICAL ACTIVITY IN AGING, OBESITY, AND CANCER
卷 1271, 期 -, 页码 97-103出版社
BLACKWELL SCIENCE PUBL
DOI: 10.1111/j.1749-6632.2012.06726.x
关键词
amniotes; mammals; birds; chorioallantoic placenta; yolk sac endoderm; nutrition; trophectoderm; extraembryonic tissues
The transfer of nutrients from the mother through the chorioallantoic placenta meets the nutritional needs of the embryo during human prenatal development. Although all amniotes start with a similar tool kit of extraembryonic tissues, an enormous diversity of extraembryonic tissue formation has evolved to accommodate embryological and physiological constraints unique to their developmental programs. A comparative knowledge of these extraembryonic tissues and their role in nutrient uptake during development is required to fully appreciate the adaptive changes in placental mammals. Here, we offer a comparative embryological perspective and propose that there are three conserved nutrient transfer routes among the amniotes. We highlight the importance of the yolk sac endoderm, thought to be a vestigial remnant of our amniote lineage, in mediating nutrient uptake during early human development. We also draw attention to the similarity between yolk sac endoderm-mediated and trophectoderm-mediated nutrient uptake.
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