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Journal of Biomedical Optics

Recognition of hypermethylated triplet repeats in vitro by cationic nanoparticles
Author(s): Latha A. Gearheart; Kimberlyn Caswell; Catherine J. Murphy
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Paper Abstract

Genomic DNA contains many higher-order structural deviations from the Watson–Crick global average. The massive expansion and hypermethylation of the duplex triplet repeat (CCG)n(CGG)n has characteristic higher-order structures that are associated with the fragile X syndrome. We have used luminescent mineral nanoparticles of protein-sized cadmium sulfide in optical assays to detect anomalous DNA structures. The photoluminescence of these particles is sensitive to the presence and nature of adsorbates. We previously found that our nanoparticles bind the fragile X repeat well but do not bind to normal double-helical DNA. In this study, we have determined that these particles are also able to detect the hypermethylated forms of these triplet repeats. Therefore, these nanoparticles may form the basis for future optical assays of higher-order DNA structures, especially those associated with human disease.

Paper Details

Date Published: 1 April 2001
PDF: 5 pages
J. Biomed. Opt. 6(2) doi: 10.1117/1.1344189
Published in: Journal of Biomedical Optics Volume 6, Issue 2
Show Author Affiliations
Latha A. Gearheart, Univ. of South Carolina (United States)
Kimberlyn Caswell, Univ. of South Carolina (United States)
Catherine J. Murphy, Univ. of South Carolina (United States)

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