Cytogenetic analysis of miscarriages from couples with recurrent miscarriage: a case-control study

Area of Science:

• Reproductive Medicine
• Human Genetics
• Clinical Cytogenetics

Background:

• Recurrent miscarriage (RM) incurs significant human and healthcare costs.
• Understanding the chromosomal basis of miscarriage is crucial for reproductive health.
• Previous studies have not fully elucidated the cytogenetic profile of RM in relation to maternal age.

Purpose of the Study:

• To determine the frequency and distribution of cytogenetic abnormalities in miscarriages from couples with recurrent miscarriage.
• To compare these findings with the general population.
• To investigate the influence of maternal age on miscarriage karyotypes.

Main Methods:

• Karyotyping of 420 miscarriage specimens (pre-clinical, embryonic, fetal) from 285 couples with RM.
• Stratification of results by maternal age.
• Comparison with control data from the general population.

Main Results:

• 54% of miscarriages were euploid, 46% were cytogenetically abnormal.
• Common abnormalities included trisomy (66.5%), polyploidy (19%), and monosomy X (9%).
• Euploid miscarriage frequency was higher in women <36 with RM compared to controls; however, the distribution of abnormal karyotypes did not differ significantly when stratified by maternal age.

Conclusions:

• Women under 36 experiencing recurrent miscarriage have a higher incidence of euploid miscarriages.
• The distribution of cytogenetically abnormal miscarriages in RM couples is comparable to the general population when maternal age is factored in.
• These findings suggest age-related factors influence euploid miscarriage rates in RM, but not the types of chromosomal abnormalities.