Mi Tang, Liling Xiong, Jianghui Cai, Li Fan, Cheng Huang, Shimao Zhang, Ying Jin, Er-dan Luo, ShaSha Xing, Xiao Yang
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Single-cell and spatial transcriptomics: Discovery of human placental development and disease
The human placenta is a vital organ, encompassing many distinct cell types, that maintains the growth and development of the fetus and is essential for substance exchange, defense, synthesis, and immunity. Abnormalities in placental cells can lead to various pregnancy complications, but the mechanisms remain largely unclear. Single-cell and spatial transcriptomics technologies have been developed in recent years to demonstrate placental cell heterogeneity and spatial molecular localization. Here, we review and summarize the current literature, demonstrating these technologies and showing the heterogeneity of various placenta cells and cell–cell communication of normal human placenta, as well as placenta-related diseases, such as preeclampsia, gestational diabetes mellitus, advanced maternal age, recurrent pregnancy loss, and placenta accreta spectrum disorders. Meanwhile, current weaknesses and future direction were discussed.