Early noninvasive prenatal paternity testing by targeted fetal DNA analysis

Area of Science:

• Genetics
• Forensic Science
• Molecular Biology

Background:

• Accurate noninvasive prenatal paternity testing is a significant challenge.
• Detecting cell-free fetal DNA in maternal blood requires sensitive analytical methods.
• Deletion/insertion polymorphisms-short tandem repeats (DIP-STR) have shown potential for analyzing paternally inherited fetal DNA.

Purpose of the Study:

• To validate DIP-STR markers for paternity testing in the first trimester of pregnancy.
• To establish a statistical framework for evaluating paternity using these markers.
• To assess the feasibility of early-term noninvasive prenatal paternity testing.

Main Methods:

• Analysis of 47 DIP-STR markers in 87 pregnancy cases.
• Blood samples collected from seven weeks of gestation onwards.
• Validation of fetal DNA detection and paternity determination methods.

Main Results:

• Fetal DNA detection in the first trimester yielded a low false negative rate of 6%.
• Seven informative DIP-STR markers were sufficient to establish paternity.
• A panel of approximately 40 DIP-STR markers can reliably determine paternity.

Conclusions:

• DIP-STR markers are effective for paternity testing from early pregnancy.
• This novel method offers improved accuracy, reduced costs, and fewer markers compared to existing approaches.
• Noninvasive prenatal paternity testing is feasible and reliable using DIP-STR analysis.