What is the procedure that adds to or replaces cytoplasm from a donor egg at various stages?

What is the procedure that adds to or replaces cytoplasm from a donor egg at various stages?

• A. Embryo biopsy
• B. Nuclear transfer
• C. IVF
• D. Cytoplasmic transfer

Answer: (D)

Cytoplasmic transfer involves adding donor cytoplasm to or replacing the recipient egg's cytoplasm at different stages, bringing in donor mitochondria and other cytoplasmic factors to support early embryo development. This targets the non-nuclear material of the egg, aiming to improve quality when the egg’s cytoplasm is deficient or mitochondrial function is a concern. The donor cytoplasm supplies mitochondria and related components that influence energy production and signaling in the early embryo, which is why this procedure is described specifically as cytoplasmic transfer rather than something that moves the nucleus or involves standard fertilization. Embryo biopsy removes cells from an embryo for genetic testing, so it does not involve changing the cytoplasm. Nuclear transfer would move a nucleus into a recipient egg, leaving the cytoplasm largely from the host egg and serving a different purpose. IVF involves fertilizing an egg with sperm outside the body without exchanging cytoplasm.

Cytoplasmic transfer involves adding donor cytoplasm to or replacing the recipient egg's cytoplasm at different stages, bringing in donor mitochondria and other cytoplasmic factors to support early embryo development. This targets the non-nuclear material of the egg, aiming to improve quality when the egg’s cytoplasm is deficient or mitochondrial function is a concern. The donor cytoplasm supplies mitochondria and related components that influence energy production and signaling in the early embryo, which is why this procedure is described specifically as cytoplasmic transfer rather than something that moves the nucleus or involves standard fertilization.

Embryo biopsy removes cells from an embryo for genetic testing, so it does not involve changing the cytoplasm. Nuclear transfer would move a nucleus into a recipient egg, leaving the cytoplasm largely from the host egg and serving a different purpose. IVF involves fertilizing an egg with sperm outside the body without exchanging cytoplasm.