Incomplete Spatial Patterning of Otic Vesicles in Human Inner Ear Organoids

Human stem cell-derived otic vesicles show incomplete regional patterning, with only a subset forming spatially segregated molecular domains and poor coordination between markers across differentiation days 12–36.

• Why it matters: The otic vesicle’s regional blueprint is essential for adult inner ear formation, but it is unknown whether human organoids regionalize vesicles as in vivo.
• What they did: The study re-analyzed published single-cell transcriptomic data and used 2D/3D imaging with a new PAX2 reporter line to assess marker co-expression and spatial domains in organoids differentiated from days 12–36.
• The result: Cells display mutually exclusive markers together and co-occurring markers in different cells, adjacent vesicles differ within aggregates, and there is no evidence for a common patterning axis, implying delayed or missing directional reinforcing signals.

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