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A partial hydatidiform mole with 2N/3N mosaicism identified by molecular analysis
1Department of Obstetrics and Gynecology, Nagasaki University School of Medicine, Japan.
Journal of Assisted Reproduction and Genetics
|October 1, 1996
Summary
This study investigated a partial hydatidiform mole using DNA markers. The findings suggest the molar region contains both diploid and triploid cells, likely due to an extra paternal genetic set.
Area of Science:
- Genetics
- Reproductive Biology
- Molecular Biology
Background:
- Partial hydatidiform moles are abnormal pregnancies with genetic origins.
- Understanding the cellular composition of molar tissue is crucial for diagnosis.
Observation:
- DNA polymorphic markers were used to analyze cells from both molar and normal-appearing regions of a placenta.
- Polymerase chain reaction (PCR) and Southern blot analysis with densitometry were employed.
Findings:
- The molar region showed a higher intensity of paternal alleles compared to maternal alleles (ratio 1.5:1).
- The normal-appearing region exhibited an even allele ratio.
- The molar region was identified as mixoploid (diploid and triploid cells), while the normal region was primarily diploid.
Implications:
- The placenta likely originated from a single conceptus with subsequent gain or loss of a paternal set.
- An extra paternal genetic contribution may cause the hydropic changes characteristic of partial hydatidiform moles.
- This research aids in understanding the genetic mechanisms behind molar pregnancies.