| 摘要 |
<p>A method for the identification of foetal DNA in a maternal DNA-containing sample such as a blood or vaginal sample, said method comprising (a) isolating DNA from said sample, (b) subjecting said DNA to exonucleolytic digestion by an enzyme so as to remove end regions of each DNA molecule, and (c) detecting the presence of a DNA sequence remaining in foetal DNA but absent form maternal DNA as a result of said digestion process. Once identified, the foetal DNA can be subject to diagnosis for example to detect chromosomal /DNA abnormalities, including in particular aneuploides such as foetal trisomy 21.</p> |
