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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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Updated: Sep 14, 2025

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Variación estructural en 1.019 humanos diversos basados en secuencias de larga lectura

Siegfried Schloissnig1, Samarendra Pani2,3, Jana Ebler2,3

  • 1Research Institute of Molecular Pathology (IMP), Vienna BioCenter (VBC), Vienna, Austria.

Nature
|July 23, 2025
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La secuenciación de larga duración de 1.019 humanos reveló más de 100.000 variantes estructurales genómicas (SV) y 300.000 repeticiones en tándem. Esto avanza en la comprensión de la diversidad genética y las enfermedades al caracterizar los SV en diversas poblaciones.

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Área de la Ciencia:

  • La genómica
  • Genética de las poblaciones
  • Biología molecular

Sus antecedentes:

  • Las variantes estructurales genómicas (SV) son cruciales para la diversidad genética y las enfermedades, pero están subcaracterizadas en grandes poblaciones.
  • Los estudios anteriores que utilizan secuenciación de lectura corta tienen limitaciones en la identificación y caracterización integrales de los SV.

Objetivo del estudio:

  • Construir un recurso genómico de cobertura intermedia utilizando secuenciación de larga lectura para la caracterización de SV en diversas poblaciones humanas.
  • Identificar y genotipar un gran número de SV resueltos en la secuencia y un número variable de repeticiones en tándem (VNTR).

Principales métodos:

  • Se llevó a cabo la secuenciación de larga lectura en 1.019 individuos de 26 poblaciones dentro del Proyecto 1000 Genomas.
  • Análisis del genoma lineal y gráfico integrado para identificar y caracterizar las variantes estructurales.
  • Número variable multialélico genotipado de repeticiones en tándem.

Principales resultados:

  • Descubrió más de 100.000 variantes estructurales bialélicas resueltas por secuencia.
  • El genotipo de 300.000 variantes multialélicas en el número de repeticiones en tándem.
  • Caracterizó las deleciones, duplicaciones, inserciones e inversiones, revelando patrones específicos de la población y el papel de la retrotransposición y los procesos mediados por la homología en la formación de SV.

Conclusiones:

  • La secuenciación de lectura larga proporciona un avance significativo para la caracterización de SV en estudios a escala de población en comparación con los enfoques de lectura corta.
  • El recurso de acceso abierto generado mejora la comprensión de la variación estructural genómica y ayuda a priorizar las variantes para aplicaciones clínicas.