Usha Chitkara

Publication Details

  • Noninvasive diagnosis of fetal aneuploidy by shotgun sequencing DNA from maternal blood PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Fan, H. C., Blumenfeld, Y. J., Chitkara, U., Hudgins, L., Quake, S. R. 2008; 105 (42): 16266-16271

    Abstract:

    We directly sequenced cell-free DNA with high-throughput shotgun sequencing technology from plasma of pregnant women, obtaining, on average, 5 million sequence tags per patient sample. This enabled us to measure the over- and underrepresentation of chromosomes from an aneuploid fetus. The sequencing approach is polymorphism-independent and therefore universally applicable for the noninvasive detection of fetal aneuploidy. Using this method, we successfully identified all nine cases of trisomy 21 (Down syndrome), two cases of trisomy 18 (Edward syndrome), and one case of trisomy 13 (Patau syndrome) in a cohort of 18 normal and aneuploid pregnancies; trisomy was detected at gestational ages as early as the 14th week. Direct sequencing also allowed us to study the characteristics of cell-free plasma DNA, and we found evidence that this DNA is enriched for sequences from nucleosomes.

    View details for DOI 10.1073/pnas.0808319105

    View details for Web of Science ID 000260597400037

    View details for PubMedID 18838674

Stanford Medicine Resources:

Footer Links: