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Epidemiología genómica y paraparesia espástica tropical asociada a la infección por el virus linfotrópico humano de células T tipo 1

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Date
2011
Author
Salcedo-Cifuentes, Mercedes
Domínguez, Martha C
García-Vallejo, Felipe
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Abstract
OBJETIVO: Caracterizar el ambiente genómico de las secuencias adyacentes al virus linfotrópico humano de células T tipo 1 (HTLV-1) en pacientes con paraparesia espßstica tropical y mielopatía asociada a la infección con HTLV-1 (PET/MAH) de diferentes regiones de Colombia y del Japón. MÉTODOS: Se enfrentaron 71 clones recombinantes con secuencias del genoma humano adyacentes al 5'-LTR de pacientes con PET/MAH, a las bases de datos del Genome Browser y del Gen-Bank. Se identificaron y analizaron estadísticamente 16 variables genómicas estructurales y composicionales mediante el programa informßtico R, versión 2.8.1, en una ventana de 0,5 Mb. RESULTADOS: El 43,0 por ciento de los provirus se localizaron en los cromosomas del grupo C; 74 por ciento de las secuencias se ubicaron en regiones teloméricas y subteloméricas (P 0,05). Un anßlisis de conglomerados permitió establecer las relaciones jerßrquicas entre las características genómicas incluidas en el estudio; el anßlisis de componentes principales identificó las componentes que definieron los ambientes genómicos preferidos para la integración proviral en casos de PET/MAH. CONCLUSIONES: El HTLV-1 se integró con mayor frecuencia en regiones de la cromatina ricas en islas de citocina fosfato guanina (CpG), de alta densidad de genes y de repeticiones tipo LINE (elemento disperso largo [long interspersed element]) y transposones de ADN que, en conjunto, conformarían los ambientes genómicos blanco de integración. Este nuevo escenario promoverß cambios sustanciales en el campo de la salud pública y en el manejo epidemiológico de las enfermedades infecciosas, y permitirß desarrollar potentes herramientas para incrementar la eficiencia de la vigilancia epidemiológica.(AU)
 
OBJECTIVE: Characterize the genomic environment of the sequences adjacent to human T-cell lymphotropic virus type 1 (HTLV-1) in patients with HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP) in different regions of Colombia and Japan. METHODS: A total of 71 recombinant clones with human genome sequences adjacent to 5' LTR in patients with HAM/TSP were compared to the Genome Browser and GenBank databases. Sixteen structural and compositional genome variables were identified, and statistical analysis was conducted in the R computer program, version 2.8.1, in a 0.5 Mb window. RESULTS: A total of 43.0 percent of the proviruses were located in the group C chromosomes; 74 percent of the sequences were located in the telomeric and subtelomeric regions (P 0.05). A cluster analysis was used to establish the hierarchical relations between the genome characteristics included in the study. The analysis of principal components identified the components that defined the preferred genome environments for proviral integration in cases of HAM/TSP. CONCLUSIONS: HTLV-1 was integrated more often in chromatin regions rich in CpG islands with a high density of genes and LINE type repetitions, and DNA transposons which, overall, would form the genomic environments targeted for integration. This new scenario will promote substantial changes in the field of public health and in epidemiological management of infectious diseases. It will also foster the development of powerful tools for increasing the efficiency of epidemiological surveillance.(AU)
 
Series
Rev Panam Salud Publica;30(5),nov. 2011
Subject
Virus 1 Linfotrópico T Humano; Integración viral; Linfocitos; Genoma Humano; Paraparesia espßstica tropical; Epidemiología Molecular; Colombia; Human T-Lymphotropic virus 1; Virus integration; Lymphocytes; Genome; Human; Paraparesis; Tropical spastic; Molecular epidemiology; Colombia; Genoma Humano; Vírus 1 Linfotrópico T Humano; Paraparesia Espástica Tropical; Provirus; Sequências Repetidas Terminais; Integração Viral; Mapeamento Cromossômico; Cromossomos Humanos; Colômbia; Ilhas de CpG; DNA Recombinante; Paraparesia Espástica Tropical; Paraparesia Espástica Tropical; Retroelementos; Alinhamento de Sequência; Análise de Sequência de DNA; Homologia de Sequência do Ácido Nucleico
URI
http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892011001100004
https://iris.paho.org/handle/10665.2/9446
Citation
Salcedo-Cifuentes, Mercedes,Domínguez, Martha C,García-Vallejo, Felipe (2011) Epidemiología genómica y paraparesia espástica tropical asociada a la infección por el virus linfotrópico humano de células T tipo 1. Rev Panam Salud Publica;30(5) 422-430,nov. 2011. Retrieved from http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S1020-49892011001100004
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