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Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues

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First-trimester spontaneous pregnancy loss - molecular analysis using multiplex ligation-dependent probe

J G Zimowski¹, D Massalska², M Pawelec¹

¹Department of Genetics, Institute of Psychiatry and Neurology, Warsaw, Poland.

Clinical Genetics

|January 11, 2016

Summary

Multiplex ligation-dependent probe amplification (MLPA) effectively detects chromosomal abnormalities in first-trimester miscarriage tissue. Proper sample preparation is crucial for accurate results, especially when interpreting normal female karyotypes.

Keywords:

aneuploidies miscarriage molecular diagnosis multiplex ligation-dependent probe amplification (MLPA)

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Area of Science:

Genetics
Reproductive Medicine
Molecular Diagnostics

Background:

Spontaneous miscarriages are common pregnancy complications, often caused by chromosomal abnormalities like aneuploidies.
Accurate detection of these aberrations is vital for understanding miscarriage etiology and providing genetic counseling.

Purpose of the Study:

To evaluate the efficacy and limitations of Multiplex Ligation-dependent Probe Amplification (MLPA) for detecting chromosomal aberrations in first-trimester miscarriage tissue.
To assess the impact of sample quality on MLPA test outcomes.

Main Methods:

Analysis of 181 MLPA tests using subtelomeric and subcentromeric probe kits (SALSA P070 and P181) on first-trimester spontaneous miscarriage products.
Data collection spanned from September 2012 to December 2014.

Main Results:

Conclusive MLPA results were achieved in 97.2% of samples.
Chromosomal aberrations were identified in 40.3% of all samples.
Detection rates were significantly higher in good quality samples (61.8%) compared to poor quality samples (12.6%).
Normal female karyotypes (46,XX) were more frequently observed in poor quality samples (84.8%) than in good quality samples (14.7%).

Conclusions:

MLPA is a valuable tool for identifying chromosomal aberrations in first-trimester miscarriage specimens.
The quality of tissue preparation significantly influences the reliability of MLPA results.
Results indicating a normal female karyotype (46,XX) require careful interpretation due to potential sample degradation issues.