[Detection of subtelomeric rearrangements due to MLPA in paediatric patients with refractory epilepsy in Colombia: the role of the CHL1 gene in pharmacoresistance]

Rev Neurol. 2013 Nov 16;57(10):444-50.
[Article in Spanish]

Abstract

INTRODUCTION. Epilepsy is a neurological disorder characterised by a predisposition to the recurrence of seizures of distinct causation and with variable clinical manifestations. Up to 40% of patients do not manage to control their seizures with the first anticonvulsive drug and the addition of a second pharmaceutical affords control in only another 11%. Given the aetiological heterogeneity of pharmacoresistance, it has been suggested that the presence of genomic disorders in patients with refractoriness could be elements worthy of analysis when it comes to estimating the alteration in the pharmacokinetic or pharmacodynamic profiles of these patients. AIM. To detect the presence of subtelomeric rearrangements in Colombian paediatric patients with refractory epilepsy. PATIENTS AND METHODS. The multiplex ligation-dependent probe amplification (MLPA) technique was used to evaluate the presence of cytogenetically non-visible chromosome aberrations in subtelomeric regions of 113 patients diagnosed with refractory epilepsy from three national referral centres in Colombia. RESULTS. Subtelomeric chromosome aberrations were detected in 0.9% of patients corresponding to a duplication of locus 3p26.3 in gene CHL1. CONCLUSIONS. This study suggests the use of the MLPA methodology to detect subtelomeric rearrangements that may be associated with phenotypes of refractoriness in epileptic patients.

Title: Deteccion de rearreglos subtelomericos por MLPA en pacientes pediatricos con epilepsia refractaria en Colombia: papel del gen CHL1 en la farmacorresistencia.

Introduccion. La epilepsia es un trastorno neurologico caracterizado por una predisposicion a la recurrencia de crisis convulsivas de etiologia diversa y con manifestaciones clinicas variables. Hasta un 40% de los pacientes no logra el control de las crisis con el primer tratamiento anticonvulsionante y la adicion de un segundo farmaco logra el control de solo un 11% adicional. Dada la heterogeneidad etiologica de la farmacorresistencia se ha propuesto que la presencia de trastornos genomicos en pacientes con refractariedad podrian ser elementos de analisis a la hora de estimar la alteracion en los perfiles farmacocineticos o farmacodinamicos de estos pacientes. Objetivo. Detectar la presencia de rearreglos subtelomericos en pacientes pediatricos colombianos con epilepsia refractaria. Pacientes y metodos. Se utilizo la tecnica de amplificacion multiple de sondas dependiente de ligamiento (MLPA) para evaluar la presencia de aberraciones cromosomicas no visibles citogeneticamente en las regiones subtelomericas de 113 pacientes diagnosticados con epilepsia refractaria provenientes de tres centros de referencia nacional en Colombia. Resultados. Se detectaron aberraciones cromosomicas subtelomericas en el 0,9% de los pacientes correspondientes a una duplicacion del locus 3p26.3 en el gen CHL1. Conclusion. Este estudio plantea el uso de la metodologia de MLPA para la deteccion de rearreglos subtelomericos que puedan asociarse con fenotipos de refractariedad en pacientes epilepticos.

Publication types

  • Case Reports
  • English Abstract
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Anticonvulsants / pharmacology*
  • Anticonvulsants / therapeutic use
  • Cell Adhesion Molecules / genetics*
  • Cell Adhesion Molecules / physiology
  • Child
  • Child, Preschool
  • Chromosome Aberrations*
  • Chromosomes, Human, Pair 3 / genetics*
  • Colombia / epidemiology
  • Consanguinity
  • Drug Resistance / genetics*
  • Epilepsy / drug therapy
  • Epilepsy / epidemiology
  • Epilepsy / genetics*
  • Exons / genetics
  • Female
  • Gene Duplication*
  • Humans
  • Male
  • Multiplex Polymerase Chain Reaction*
  • Nerve Tissue Proteins / metabolism
  • Protein Interaction Mapping
  • Protein Structure, Tertiary
  • SNARE Proteins / metabolism
  • Synaptic Transmission

Substances

  • Anticonvulsants
  • CHL1 protein, human
  • Cell Adhesion Molecules
  • Nerve Tissue Proteins
  • SNARE Proteins