Trophoblast giant cell-like cells differentiated directly from ES cells in vitro recapitulate the copy-number landscape of trophoblast giant cells in vivo.

Conditional repression of Oct4 in mouse embryonic stem cells yields trophoblast giant cell-like cells whose single-cell copy-number landscapes closely match in vivo trophoblast giant cells, including UR domains.

• Why it matters: Copy-number variation in trophoblast giant cells is linked to how endoreplication and replication timing are regulated, but mechanisms are hard to study in vivo.
• What they did: Mouse ESCs were differentiated into extraembryonic lineages by Oct4 repression for 15 days; single, non-proliferating TGC-like cells were selected by morphology and profiled by whole-genome amplification plus next-generation sequencing.
• The result: Copy-number variation is highly conserved across individual TGC-like cells and resembles the in vivo pattern, with over- and under-replicated regions aligning with early/late replication timing and UR domains replicating very late, enabling mechanistic studies of copy-number regulation.

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