Format

Send to:

Choose Destination
See comment in PubMed Commons below
Diagn Microbiol Infect Dis. 2013 Jul;76(3):278-85. doi: 10.1016/j.diagmicrobio.2013.03.029. Epub 2013 May 13.

Detection of Clostridium difficile toxins A, B and binary toxin with slow off-rate modified aptamers.

Author information

  • 1SomaLogic, Inc., 2945 Wilderness Place, Boulder, CO 80301, USA. uochsner@somalogic.com

Abstract

Rapid and accurate diagnostic tests for Clostridium difficile infections (CDI) are crucial for management of patients with suspected CDI and for infection control. Enzyme immunoassays for detection of the toxins are routinely used but lack adequate sensitivity. We generated slow off-rate modified aptamers (SOMAmerâ„¢ reagents) via in vitro selection (SELEX) that bind toxins A, B and binary toxin with high affinity and specificity. Using SOMAmers alone or in conjunction with antibodies, we have developed toxin assays with a 1 pmol/L (300 pg/mL) limit of detection and a 3 log dynamic range. SOMAmers proved useful as capture or detection agents in equilibrium solution binding radioassays, pull-down capture assays, dot blots, and plate- or membrane-based sandwich assays, thus represent a promising alternative to antibodies in diagnostic applications. SOMAmers detected toxins A, B and binary toxin in culture supernatants from toxigenic C. difficile, including a BI/NAP1 strain and historic strains.

Copyright © 2013 Elsevier Inc. All rights reserved.

PMID:
23680240
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk