During early embryo development, which process results in a compacted morula through tight junctions between blastomeres?

During early embryo development, which process results in a compacted morula through tight junctions between blastomeres?

• A. Compaction
• B. Cryopreservation
• C. Clinical pregnancy rate
• D. Complex aneuploidies

Answer: (A)

Compaction is the morphogenetic event in early embryo development where blastomeres increase cell–cell adhesion and reorganize into a compact, cohesive ball. As cells come into contact, adhesion molecules like E-cadherin strengthen their connections, and tight junctions form between neighboring blastomeres. This creates a continuous, epithelial‑like surface and reduces the overall surface area, producing a compacted morula. This rearrangement not only holds the cells together but also helps establish polarity and sets the stage for later differentiation into the inner cell mass and the surrounding trophectoderm, leading to blastocyst formation. The other terms describe processes unrelated to this cellular rearrangement: cryopreservation involves freezing embryos, clinical pregnancy rate is an outcome measure, and complex aneuploidies refer to chromosomal abnormalities.

Compaction is the morphogenetic event in early embryo development where blastomeres increase cell–cell adhesion and reorganize into a compact, cohesive ball. As cells come into contact, adhesion molecules like E-cadherin strengthen their connections, and tight junctions form between neighboring blastomeres. This creates a continuous, epithelial‑like surface and reduces the overall surface area, producing a compacted morula. This rearrangement not only holds the cells together but also helps establish polarity and sets the stage for later differentiation into the inner cell mass and the surrounding trophectoderm, leading to blastocyst formation. The other terms describe processes unrelated to this cellular rearrangement: cryopreservation involves freezing embryos, clinical pregnancy rate is an outcome measure, and complex aneuploidies refer to chromosomal abnormalities.