Paternal age and Down's syndrome: data from prenatal diagnoses (DFG).

Area of Science:

• Genetics
• Reproductive Medicine
• Prenatal Diagnostics

Background:

• Maternal age is a known risk factor for chromosomal abnormalities.
• The impact of paternal age on fetal chromosomal health requires further investigation.

Purpose of the Study:

• To investigate the association between advanced paternal age and the risk of trisomy 21.
• To evaluate the combined effect of parental ages on the risk of any de novo chromosomal aberration.
• To provide recommendations for prenatal diagnosis based on parental age.

Main Methods:

• Analysis of prenatal diagnosis data from mothers aged 35 years and above in Germany.
• Statistical evaluation of trisomy 21 and de novo chromosomal aberration risks in relation to paternal age.

Main Results:

• Advanced paternal age is linked to an increased risk of trisomy 21 offspring.
• The risk of trisomy 21 is particularly significant for paternal ages of 41 years and above.
• The risk of any de novo chromosomal aberration increases with paternal age, especially in older mothers.

Conclusions:

• Paternal age is a significant independent risk factor for trisomy 21.
• Both maternal and paternal ages should be considered when determining the need for prenatal diagnosis.
• Risk figures for chromosomal abnormalities can guide prenatal diagnostic recommendations.