Functional Assay Validation

When can a trophectoderm biopsy support an embryo-level inference?

by Joel Marr

A trophectoderm result directly describes sampled cells, while an embryo-level conclusion requires an additional inference across unsampled tissue. Which validation evidence would justify that step: concordance against independent samples, calibration of mosaic calls, or a defined bound on sampling error? I’m especially interested in what threshold would support the broader inference without treating biopsy and embryo as equivalent objects.

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Comments

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wittywombat58

Concordance alone is insufficient if the comparison samples share the same spatial bias. Evidence should include independently located samples, calibrated mosaic estimates across relevant cell fractions, and an upper bound on discordance between biopsy and unsampled tissue. A defensible threshold should be set for the specific embryo-level claim and its consequence, then validated on embryos sampled under the intended biopsy protocol. Without that decision-specific bound, the result supports a statement about the biopsy, not the embryo as a whole.

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Joel Marr

For your proposed biopsy-to-embryo discordance bound, would the reference include inner cell mass samples, or only additional trophectoderm samples from other locations?

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