DNA-labelled cytidine assay for the quantification of CAG repeats

Dannelys Pérez-Bello, Z. H. Xu, David Higginson-Clarke, Ana María Riverón Rojas, Weidong Le, Chryslaine Rodríguez-Tanty

Research output: Contribution to journalArticle

Abstract

The sequencing procedure has been used to determine the size of the CAG repeat expansion for the diagnosis of genetic disorders. Likewise, standard polymerase chain reaction (PCR) and gel electrophoresis techniques are applied for screening large number of patients. The trinucleotide repeats (TNR) region amplification by means of the PCR procedure was initially performed using 32-P end-labelled primers and currently carried out with fluorescently end-labelled primers. The goal to obtain reliable TNR quantification assays, at low cost and short assay times, represents a challenge for the molecular diagnosis aimed at massive screening of affected populations. In the current work, we obtained preliminary results of a new methodology for the detection and size estimation of CAG expanded alleles. The assay was based on an indirect enzyme linked immunosorbent assay (ELISA) for quantifying the amount of labelled cytidines in DNA molecules. The label, 6-(p-bromobenzamido)caproyl radical, was introduced by the transamination and acylation reactions. A group of model sequences containing different numbers of CAG repeats, as well as the ATXN3 (ataxin 3) gene (from subjects suffering type 3 spinocerebellar ataxia SCA3) were used for assay standardization. The assay is simple, inexpensive, and easy to perform and differentiates distinct degrees of CAG expansions.

Original languageEnglish (US)
Pages (from-to)201-207
Number of pages7
JournalJournal of Neuroscience Methods
Volume169
Issue number1
DOIs
StatePublished - Mar 30 2008
Externally publishedYes

Fingerprint

Trinucleotide Repeats
Cytidine
Machado-Joseph Disease
Polymerase Chain Reaction
Inborn Genetic Diseases
Acylation
DNA
Electrophoresis
Gels
Enzyme-Linked Immunosorbent Assay
Alleles
Costs and Cost Analysis
Population
Genes
Ataxin-3

Keywords

  • Immunoquantification
  • Non-enzymatic labelling
  • Non-radioactive label
  • Spinocerebellar ataxia
  • Trinucleotide repeat

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Pérez-Bello, D., Xu, Z. H., Higginson-Clarke, D., Rojas, A. M. R., Le, W., & Rodríguez-Tanty, C. (2008). DNA-labelled cytidine assay for the quantification of CAG repeats. Journal of Neuroscience Methods, 169(1), 201-207. https://doi.org/10.1016/j.jneumeth.2007.10.020

DNA-labelled cytidine assay for the quantification of CAG repeats. / Pérez-Bello, Dannelys; Xu, Z. H.; Higginson-Clarke, David; Rojas, Ana María Riverón; Le, Weidong; Rodríguez-Tanty, Chryslaine.

In: Journal of Neuroscience Methods, Vol. 169, No. 1, 30.03.2008, p. 201-207.

Research output: Contribution to journalArticle

Pérez-Bello, D, Xu, ZH, Higginson-Clarke, D, Rojas, AMR, Le, W & Rodríguez-Tanty, C 2008, 'DNA-labelled cytidine assay for the quantification of CAG repeats', Journal of Neuroscience Methods, vol. 169, no. 1, pp. 201-207. https://doi.org/10.1016/j.jneumeth.2007.10.020
Pérez-Bello D, Xu ZH, Higginson-Clarke D, Rojas AMR, Le W, Rodríguez-Tanty C. DNA-labelled cytidine assay for the quantification of CAG repeats. Journal of Neuroscience Methods. 2008 Mar 30;169(1):201-207. https://doi.org/10.1016/j.jneumeth.2007.10.020
Pérez-Bello, Dannelys ; Xu, Z. H. ; Higginson-Clarke, David ; Rojas, Ana María Riverón ; Le, Weidong ; Rodríguez-Tanty, Chryslaine. / DNA-labelled cytidine assay for the quantification of CAG repeats. In: Journal of Neuroscience Methods. 2008 ; Vol. 169, No. 1. pp. 201-207.
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