Rearrangement of chromosome spatial organization in mouse zygotes using optical tweezers does not affect preimplantation development

Physically rearranging nuclear contents in mouse zygotes with optical tweezers does not affect preimplantation development, including overall blastocyst formation.

• Why it matters: Chromosome spatial organization is proposed to influence gene expression and chromosome segregation, but its physiological importance in early development is disputed.
• What they did: Optical tweezers displaced nucleoli and physically rearranged nuclear contents in mouse zygotes, while preimplantation development, cell dynamics, and gene expression were monitored.
• The result: The shuffled-nucleus zygotes showed no detectable changes in cell dynamics, gene expression, or blastocyst formation, suggesting chromosome spatial organization is not critical for blastocyst development in this context.