Jump to main content
Jump to site search

Issue 1, 2016
Previous Article Next Article

Implementing a strategy for on-chip detection of cell-free DNA fragments using GMR sensors: A translational application in cancer diagnostics using ALU elements

Author affiliations

Abstract

Cell-free DNA (cfDNA) is foreseen as a promising source for liquid biopsies in cancer diagnostics. Despite its promise, methods available for its evaluation lack in robustness or, in the case of next-generation sequencing (NGS), are extremely sensitive but overly complex for routine operation. In contrast to NGS, integrated lab-on-chip devices offer advantages particularly in terms of automation, cost and speed. These devices, however, have rarely demonstrated the detection of biologically relevant DNA fragments originating from blood. To this end, we present a strategy for the magnetic labeling and detection of cfDNA fragments, using an array of 30 magnetoresistive (MR) sensors integrated in a portable biochip platform. As a proof-of-concept, we selected the fragments ALU115 and ALU247, recently identified as promising cancer targets in cfDNA integrity assessment. This work reveals a rational optimization of the DNA probes design and density at the surface which allowed achieving specific target detection and increased inhibition of unspecific interactions, without the need for blocking agents. The developed strategy is adaptable for the detection of mutations, homologous or truncated sequences such as the case of ALU115 and ALU247, sequences that share great similarity. Upon optimization, the MR sensors detected a concentration of the ALU elements within the picomolar range, showing potential for cfDNA analysis in cancer diagnostics.

Graphical abstract: Implementing a strategy for on-chip detection of cell-free DNA fragments using GMR sensors: A translational application in cancer diagnostics using ALU elements

Back to tab navigation

Supplementary files

Publication details

The article was received on 19 Jun 2015, accepted on 10 Nov 2015 and first published on 13 Nov 2015


Article type: Paper
DOI: 10.1039/C5AY01587A
Author version available: Download Author version (PDF)
Citation: Anal. Methods, 2016,8, 119-128
  •   Request permissions

    Implementing a strategy for on-chip detection of cell-free DNA fragments using GMR sensors: A translational application in cancer diagnostics using ALU elements

    T. M. Dias, F. A. Cardoso, S. A. M. Martins, V. C. Martins, S. Cardoso, J. F. Gaspar, G. Monteiro and P. P. Freitas, Anal. Methods, 2016, 8, 119
    DOI: 10.1039/C5AY01587A

Search articles by author

Spotlight

Advertisements