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        "resumen" => "<span class="elsevierStyleSectionTitle">Objetivos</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Poner a punto una metodolog&#237;a r&#225;pida y eficaz para el diagn&#243;stico molecular del s&#237;ndrome X fr&#225;gil &#40;SXF&#41;&#44; mediante t&#233;cnicas de reacci&#243;n en cadena de la polimerasa &#40;PCR&#41; del triplete CGG&#44; y establecer as&#237; un protocolo que nos sirva para&#58; a&#41; descartar el s&#237;ndrome en pacientes con retraso mental no clasificado&#59; b&#41;averiguar el genotipo exacto de los individuos afectados&#59; c&#41;estudiar todos los individuos en riesgo de las familias con s&#237;ndrome X fr&#225;gil y encontrar los portadores asintom&#225;ticos&#44; y d&#41; proporcionar as&#237; el adecuado asesoramiento gen&#233;tico y reproductor a las familias en las que se transmita el s&#237;ndrome&#46;</p> <span class="elsevierStyleSectionTitle">Pacientes y m&#233;todos</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Se estudiaron 438 muestras de individuos de 50 familias con s&#237;ndrome X fr&#225;gil&#46; Se utilizaron tres protocolos de PCR&#44; uno para detecci&#243;n con bromuro de etidio y luz ultravioleta&#59; el segundo para detecci&#243;n con digoxigenina y el sustrato quimioluminiscente &#40;CSPD&#41;&#44; trasblotting e hibridaci&#243;n con la oligosonda &#40;CGG&#41;5&#59; el tercero para amplificar y detectar de forma parecida el microsat&#233;lite DXS 548&#46;</p> <span class="elsevierStyleSectionTitle">Resultados</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Se encontraron 121 individuos con la mutaci&#243;n completa &#40;60 varones y 61 mujeres&#41;&#59; 86 premutados &#40;7 varones y 79 mujeres&#41;&#59; 16 mosaicos y 215 normales&#46; La PCR ampli-fic&#243; hasta 120-150 repeticiones&#44; y fue necesario el estudio directo con sonda en el caso de ausencia de banda o banda &#250;nica en mujeres&#46; La PCR result&#243; m&#225;s precisa que el Southern-blot de ADN gen&#243;mico en los portadores premutados&#46; Finalmente&#44; se hall&#243; en una familia recombinaci&#243;n entre el locusFRAXA y el microsat&#233;lite DXS 548&#46;</p> <span class="elsevierStyleSectionTitle">Conclusiones</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Estos protocolos de PCR no radiactiva permiten el diag-n&#243;stico r&#225;pido y seguro del s&#237;ndrome X fr&#225;gil&#44; y est&#225;n especialmente indicados en posibles portadoras y para establecer el diagn&#243;stico prenatal&#46;</p>"
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        "resumen" => "<span class="elsevierStyleSectionTitle">Objectives</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">The aim of this study was to develop a rapid&#44; non-radioactive and effective method for the molecular diagnosis of fragile X syndrome &#40;FXS&#41; by the polymerase chain reaction &#40;PCR&#41; of the CGG repeat and to establish a protocol to be used in&#58; a&#41;ruling out FXS in patients with non-specific mental retardation&#59; b&#41; determining the exact genotype of affected individuals&#59; c&#41;studying all at-risk individuals from families with FXS and identifying asymptomatic carriers&#44; and d&#41; offering accurate genetic and reproductive counselling to families with FXS&#46;</p> <span class="elsevierStyleSectionTitle">Materials and methods</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Samples from 438 individuals from 50 families with FXS were studied using three different PCR tests&#58; the first to detect ethidium bromide through ultraviolet light&#44; the second to detect digoxigenin and CSPD after blotting and hybridisation with the &#40;CGG&#41;5 oligoprobe&#44; and the third to amplify and detect the DXS 548 microsatellite&#46;</p> <span class="elsevierStyleSectionTitle">Results</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Of the 438 individuals studied&#44; 121 had full mutations &#40;60 males and 61 females&#41;&#44; 86 had pre-mutations &#40;7 males and 79 females&#41;&#44; 16 showed mosaic patterns and 215 had no mutations&#46; PCR techniques amplified up to 120-150 repeats&#44; and direct study with probes was required when no bands or only one band was detected in females&#46; PCR was more accurate than genomic DNA Southern blot analysis in pre-mutated carriers&#46; In one family&#44; recombination between the FRAXA locus and the DXS 548 microsatellite was found&#46;</p> <span class="elsevierStyleSectionTitle">Conclusions</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">These non-radioactive PCR protocols permit rapid and accurate diagnosis of FXS&#46; They and are especially useful in prenatal diagnosis and in the identification of carriers&#46;</p>"
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Vol. 54. Núm. 4.
Páginas 331-339 (abril 2001)
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Vol. 54. Núm. 4.
Páginas 331-339 (abril 2001)
Acceso a texto completo
Diagnóstico molecular por reacción en cadena de la polimerasa del síndrome X frágil: aplicación de un protocolo diagnóstico en 50 familias del norte de España
Molecular diagnosis of fragile X syndrome by polymerase chain reaction: Application of a diagnostic protocol in 50 families from northern Spain
Visitas
9275
M. Durán Domíngueza,b, M. Molina Carrilloa, J. Fernández Toralc, T. Martínez Merinod, M.aA. López Arísteguie, A.I. Álvarez Retuertoa, M.aL. Onaindía Urquijoa, M.aI. Tejada Míngueza,
Autor para correspondencia
itejada@hbas.osakidetza.net

Correspondencia: Unidad de Genética. Hospital de Basurto. Avda. Montevideo, 18. 48013Bilbao
a Unidad de Genética. Hospital de Basurto. Bilbao.
b Instituto de Biología y Genética Molecular. Facultad de Medicina. Universidad de Valladolid.
c Sección de Genética. Servicio de Pediatría. Hospital Central de Asturias.
d Laboratorio de Genética. Hospital de Cantabria. Santander.
e Laboratorio de Genética. Hospital de Cruces. Baracaldo. Bilbao.
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Resumen
Bibliografía
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Estadísticas
Objetivos

Poner a punto una metodología rápida y eficaz para el diagnóstico molecular del síndrome X frágil (SXF), mediante técnicas de reacción en cadena de la polimerasa (PCR) del triplete CGG, y establecer así un protocolo que nos sirva para: a) descartar el síndrome en pacientes con retraso mental no clasificado; b)averiguar el genotipo exacto de los individuos afectados; c)estudiar todos los individuos en riesgo de las familias con síndrome X frágil y encontrar los portadores asintomáticos, y d) proporcionar así el adecuado asesoramiento genético y reproductor a las familias en las que se transmita el síndrome.

Pacientes y métodos

Se estudiaron 438 muestras de individuos de 50 familias con síndrome X frágil. Se utilizaron tres protocolos de PCR, uno para detección con bromuro de etidio y luz ultravioleta; el segundo para detección con digoxigenina y el sustrato quimioluminiscente (CSPD), trasblotting e hibridación con la oligosonda (CGG)5; el tercero para amplificar y detectar de forma parecida el microsatélite DXS 548.

Resultados

Se encontraron 121 individuos con la mutación completa (60 varones y 61 mujeres); 86 premutados (7 varones y 79 mujeres); 16 mosaicos y 215 normales. La PCR ampli-ficó hasta 120-150 repeticiones, y fue necesario el estudio directo con sonda en el caso de ausencia de banda o banda única en mujeres. La PCR resultó más precisa que el Southern-blot de ADN genómico en los portadores premutados. Finalmente, se halló en una familia recombinación entre el locusFRAXA y el microsatélite DXS 548.

Conclusiones

Estos protocolos de PCR no radiactiva permiten el diag-nóstico rápido y seguro del síndrome X frágil, y están especialmente indicados en posibles portadoras y para establecer el diagnóstico prenatal.

Palabras clave:
Síndrome X frágil
Triplete CGG
PCR
Microsatélite DXS548
Objectives

The aim of this study was to develop a rapid, non-radioactive and effective method for the molecular diagnosis of fragile X syndrome (FXS) by the polymerase chain reaction (PCR) of the CGG repeat and to establish a protocol to be used in: a)ruling out FXS in patients with non-specific mental retardation; b) determining the exact genotype of affected individuals; c)studying all at-risk individuals from families with FXS and identifying asymptomatic carriers, and d) offering accurate genetic and reproductive counselling to families with FXS.

Materials and methods

Samples from 438 individuals from 50 families with FXS were studied using three different PCR tests: the first to detect ethidium bromide through ultraviolet light, the second to detect digoxigenin and CSPD after blotting and hybridisation with the (CGG)5 oligoprobe, and the third to amplify and detect the DXS 548 microsatellite.

Results

Of the 438 individuals studied, 121 had full mutations (60 males and 61 females), 86 had pre-mutations (7 males and 79 females), 16 showed mosaic patterns and 215 had no mutations. PCR techniques amplified up to 120-150 repeats, and direct study with probes was required when no bands or only one band was detected in females. PCR was more accurate than genomic DNA Southern blot analysis in pre-mutated carriers. In one family, recombination between the FRAXA locus and the DXS 548 microsatellite was found.

Conclusions

These non-radioactive PCR protocols permit rapid and accurate diagnosis of FXS. They and are especially useful in prenatal diagnosis and in the identification of carriers.

Key words:
Fragile X syndrome
CGG repeat
Polymerase chain reaction
DXS548microsatellite
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Este trabajo ha sido financiado por un Proyecto de Investigación FIS (n. º 94/0857) y ayudas del Departamento de Sanidad del Gobierno Vasco

Copyright © 2001. Asociación Española de Pediatría
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