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Highly sensitive colorimetric enzyme-linked oligonucleotide assay based on cyclodextrin-modified polymeric surfaces.

Mayreli Ortiz¹, Mabel Torréns, Alex Fragoso

¹Departament d'Enginyeria Química, Universitat Rovira i Virgili, Tarragona, Spain.

Analytical and Bioanalytical Chemistry

|February 14, 2012

Summary

Researchers developed a new assay for detecting human leukocyte antigen (HLA) alleles linked to celiac disease. This cyclodextrin-based method offers highly sensitive and selective detection, crucial for diagnosing this autoimmune condition.

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Area of Science:

Biotechnology
Analytical Chemistry
Immunogenetics

Background:

Celiac disease is an autoimmune disorder triggered by gluten ingestion, strongly associated with specific human leukocyte antigen (HLA) alleles.
Accurate and sensitive detection of these HLA alleles is essential for diagnosis and personalized risk assessment.
Current detection methods may require optimization for sensitivity, selectivity, and cost-effectiveness.

Purpose of the Study:

To develop and optimize a novel enzyme-linked oligonucleotide assay for detecting HLA alleles associated with celiac disease.
To utilize cyclodextrin-modified polymeric surfaces for enhanced supramolecular capture of DNA probes.
To achieve highly sensitive and selective detection of target HLA sequences.

Main Methods:

Maleimide-pre-coated plates were modified with thiolated cyclodextrin polymers.
Supramolecular capture of adamantane or ferrocene-modified carboxymethylcellulose polymers bearing DNA probes was employed.
Assay conditions including incubation time, temperature, and surface chemistry were optimized.
The assay's performance was evaluated for sensitivity and selectivity in detecting HLA sequences.

Main Results:

The developed assay demonstrated high sensitivity with a limit of detection of 0.7 nM for HLA sequences.
The assay showed excellent selectivity in detecting specific HLA alleles.
Analysis of a real sample confirmed excellent correlation with established methods using maleimide-activated plates and thiolated DNA probes.

Conclusions:

The cyclodextrin-modified polymeric surface provides an effective platform for developing sensitive and selective oligonucleotide assays.
This novel assay is a promising tool for the accurate detection of HLA alleles associated with celiac disease.
The method offers a viable alternative for HLA genotyping with potential for clinical application.