Novel ploidy analysis in ectopic pregnancy

Area of Science:

• Reproductive Medicine
• Genetics
• Gynecologic Oncology

Background:

• Ectopic pregnancy diagnosis often relies on clinical and biochemical data.
• Aneuploidy is a common finding in spontaneous abortions, but its prevalence in ectopic pregnancies is less understood.
• Accurate ploidy assessment of ectopic pregnancy tissue can aid in understanding its pathophysiology.

Purpose of the Study:

• To evaluate the utility of single-nucleotide polymorphism (SNP) array technology for assessing the ploidy status of ectopic pregnancy tissue.
• To determine if SNP array analysis can differentiate between aneuploid and euploid ectopic pregnancies.
• To establish a proof of concept for using archived formalin-fixed, paraffin-embedded (FFPE) tissues for genetic analysis.

Main Methods:

• A case series design was employed at an academic medical center.
• DNA was extracted from archived FFPE ectopic pregnancy specimens (n=8) obtained from surgically removed ectopic pregnancies.
• Single-nucleotide polymorphism (SNP) microarray technology was utilized to determine chromosome number and assess for maternal cell contamination.

Main Results:

• All eight analyzed ectopic pregnancy samples were found to be euploid (normal chromosome number).
• The SNP array successfully determined the ploidy status and ruled out maternal cell contamination in all cases.
• The study demonstrated the feasibility of using DNA extracted from FFPE tissue for SNP array analysis.

Conclusions:

• SNP array technology is a feasible method for determining the ploidy status of ectopic pregnancy tissue, even from routinely stored FFPE blocks.
• While this study's small sample size yielded only euploid results, the methodology is validated.
• Further investigation is warranted to confirm the prevalence of aneuploidy in ectopic pregnancies and elucidate underlying mechanisms.