Effects of subtelomeric copy number variations in miscarriages

Area of Science:

• Genetics
• Reproductive Medicine

Background:

• Recurrent miscarriages affect couples worldwide.
• Identifying chromosomal abnormalities is crucial for understanding miscarriage etiology.
• Subtelomeric regions are prone to copy number variations (CNVs).

Purpose of the Study:

• To detect subtelomeric copy number variations (CNVs) in miscarriage samples.
• To adapt the multiplex ligation-dependent probe amplification (MLPA) method for prenatal diagnosis.
• To investigate the role of subtelomeric CNVs in recurrent miscarriages.

Main Methods:

• Analysis of 60 miscarriage samples and maternal blood.
• DNA isolation and quantitative fluorescent polymerase chain reaction for maternal contamination.
• Assessment of subtelomeric regions using the MLPA method.

Main Results:

• Karyotype analysis revealed normal results in 44.2%, numerical abnormalities in 23.3%, and structural abnormalities in 4.7% of 43 samples.
• Subtelomeric 16q duplication (a type of CNV) was identified in 6.6% of 30 miscarriage samples analyzed by MLPA.
• No statistically significant difference in subtelomeric CNVs was found between miscarriage and control groups, but the observed CNVs in miscarriages were absent in controls.

Conclusions:

• Subtelomeric CNVs may contribute to miscarriage, particularly in recurrent cases.
• The MLPA method is suitable for subtelomeric CNV detection in prenatal diagnosis.
• Further research is warranted to elucidate the clinical significance of subtelomeric CNVs in recurrent miscarriages.