Restricted accessResearch articleFirst published online 2018-10
Sex-Specific Gene Expression Differences Are Evident in Human Embryonic Stem Cells and During In Vitro Differentiation of Human Placental Progenitor Cells
The placenta is a short-lived tissue required for embryonic growth and survival, and it is fetal derived. Fetal sex influences gestation, and many sexual dimorphic diseases have origins in utero. There is sex-biased gene expression in third-trimester human placentas, yet the origin of sex-specific expression is unknown. Here, we used an in vitro differentiation model to convert human embryonic stem cells (hESCs) into trophoblastic progenitor cells of the first-trimester placenta, which will eventually become mature extravillous trophoblasts and syncytiotrophoblasts. We observed significant sex differences in transcriptomic profiles of hESCs and trophoblastic progenitors, and also with the differentiation process itself. Male cells had higher dosage of X/Y gene pairs relative to female samples, supporting functions for Y-linked genes beyond spermatogenesis in the hESCs and in the early placenta. Female-specific differentiation altered the expression of several thousand genes compared with male cells, and female cells specifically upregulated numerous autosomal genes with known roles in trophoblast function. Sex-biased upregulation of cellular pathways during trophoblast differentiation was also evident. This study is the first to identify sex differences in trophoblastic progenitor cells of the first-trimester human placenta, and reveal early origins for sexual dimorphism.
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