Methodology matters: IVF versus ICSI and embryonic gene expression.

Area of Science:

• Reproductive biology
• Developmental biology
• Genomics

Background:

• Assisted reproduction treatments (ART), particularly intracytoplasmic sperm injection (ICSI), are associated with adverse outcomes.
• The underlying genetic causes of these adverse effects remain largely unknown.

Purpose of the Study:

• To investigate gene expression differences in blastocysts created via ICSI and ICSI with artificial oocyte activation (ICSI-A) compared to conventional in vitro fertilization (IVF).
• To provide genetic insights that could aid in diagnosing or treating ART-related adverse effects and refine ART techniques.

Main Methods:

• Murine blastocysts were generated using ICSI, ICSI-A, and IVF.
• Microarray analysis was employed to assess gene expression profiles.
• Differential gene expression and affected biological pathways were identified.

Main Results:

• Significant differences in gene expression were observed: 197 genes between ICSI and IVF blastocysts (P < 0.01).
• 132 genes differed between ICSI-A and IVF blastocysts (P < 0.01).
• 65 genes differed between ICSI-A and ICSI blastocysts (P < 0.01).
• Procedural-induced genetic changes in specific pathways showed correlation with known adverse consequences.

Conclusions:

• ICSI and ICSI-A significantly alter blastocyst gene expression compared to IVF.
• These genetic alterations may underlie adverse outcomes observed in ART.
• Further research into procedure-specific genetic dysfunction is warranted.