نتایج جستجو برای: free fetal dna cffdna
تعداد نتایج: 1076072 فیلتر نتایج به سال:
Noninvasive prenatal testing (NIPT) using sequencing of fetal cell-free DNA from maternal plasma has enabled accurate prenatal diagnosis of aneuploidy and become increasingly accepted in clinical practice. We investigated whether NIPT using semiconductor sequencing platform (SSP) could reliably detect subchromosomal deletions/duplications in women carrying high-risk fetuses. We first showed tha...
BACKGROUND The precise measurement of cell-free fetal DNA in maternal plasma facilitates noninvasive prenatal diagnosis of fetal chromosomal aneuploidies and other applications. We tested the hypothesis that microfluidics digital PCR, in which individual fetal-DNA molecules are counted, could enhance the precision of measuring circulating fetal DNA. METHODS We first determined whether microfl...
BACKGROUND Efforts have been undertaken recently to assess the fetal genome through analysis of circulating cell-free (ccf) fetal DNA obtained from maternal plasma. Sequencing analysis of such ccf DNA has been shown to enable accurate prenatal detection of fetal aneuploidies, including trisomies of chromosomes 21, 18, and 13. We sought to extend these analyses to examine subchromosomal copy num...
BACKGROUND Routine prenatal diagnosis of chromosomal anomalies is based on invasive procedures, which carry a risk of approximately 1%-2% for loss of pregnancy. An alternative to these inherently invasive techniques is to isolate fetal DNA circulating in the pregnant mother's plasma. Free fetal DNA circulates in maternal plasma primarily as fragments of lengths <500 bp, with a majority being <3...
BACKGROUND Genomic DNA sequences in cell-free plasma are biomarkers of cancer prognosis, where characteristic changes in methylation of tumour suppressor or oncogene DNA regions are indicative of changes in gene activity. Also, cell-free fetal DNA can be distinguished, by its methylation status, from the maternal DNA in the plasma of pregnant women, hence providing DNA biomarkers for the propos...
Researchers and clinicians are increasingly interested in using Next Generation Sequencing (NGS) analysis of cell-free DNA (cfDNA) found in plasma (the cell-free fraction of anticoagulated blood) for biomarker discovery and diagnostic applications. Two areas of specific interest are non-invasive prenatal diagnostics (1-6) and monitoring efficacy of treatment in cancer patients (7-20). Many rece...
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