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X-inactivation states of single cell transcriptomes reveal cellular phylogenies in human females

Predeus, A.; Arutyunyan, A.; Jardine, L.; Suo, C.; Dann, E.; Hoo, R.; Prete, M.; Haniffa, M.; Mitchell, T. J.; Vento-Tormo, R.; Young, M. D.

2022-11-13 genomics
10.1101/2022.11.10.515645 bioRxiv
Show abstract

Human females undergo X-inactivation (Xi), whereby one copy of X is randomly inactivated early in development, then propagated through cell division. Because Xi state is inherited, its measurement in populations of cells encodes information about the phylogeny that created them and their relationships to other cells. We present a method, inactiveXX, to determine the Xi state of single cell transcriptomes, and demonstrate its accuracy using cancer and gold standard reference data. We apply inactiveXX to single cell transcriptomes from 190 human females, revealing that Xi in humans likely occurs around the 16 cell blastocyst stage and affects both embryonic and extra-embryonic tissues. We further find significant cell type specific variability in Xi skew, only detectable with cell type specific resolution, with certain cell types exhibiting strong population bottlenecks across tissues and disease state.

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