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Genetic variation is the diversity in DNA sequences found among individuals of the same species. This diversity is crucial for a species' survival because it helps organisms adapt to environmental changes. Genetic variation begins with fertilization, where an egg and sperm cell merge. Each of these cells carries 23 chromosomes, up to 46 in the fertilized egg. Chromosomes are long DNA strands that contain genes, the basic units of heredity.
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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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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Diversidad de variación estructural impulsada por la mezcla y sus implicaciones funcionales

Haiyi Lou1, Yimin Wang2, Yu Chai1

  • 1State Key Laboratory of Genetics and Development of Complex Phenotypes, Center for Evolutionary Biology, School of Life Sciences, Fudan University, Shanghai 200438, China.

National science review
|February 18, 2026
PubMed
Resumen
Este resumen es generado por máquina.

La mezcla poblacional aumenta significativamente la diversidad de la variación estructural (VE), creando variantes novedosas e influyendo en la expresión génica. Esta diversificación genómica en grupos mezclados como los uigures ofrece información evolutiva e impacta la medicina genética.

Palabras clave:
Uigursesgo ancestraldinámica evolutivaadaptación localrecombinación homóloga no alélica (NAHR)mezcla poblacionalvariación estructural (VE)

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Área de la Ciencia:

  • Genética de Poblaciones
  • Genómica
  • Biología Evolutiva

Sus antecedentes:

  • La mezcla poblacional es un motor clave de la diversidad genómica.
  • No se comprende bien el impacto de la mezcla en la dinámica y la función de la variación estructural (SV).
  • Los uigures representan una población mixta euroasiática modelo con contribuciones ancestrales occidentales y orientales.

Objetivo del estudio:

  • Analizar exhaustivamente las variaciones estructurales (SV) en la población uigur mediante secuenciación del genoma completo.
  • Investigar la relación entre las proporciones de mezcla y la diversidad de SV.
  • Explorar las consecuencias funcionales de las SV en poblaciones mezcladas.

Principales métodos:

  • Secuenciación del genoma completo de la población uigur.
  • Identificación y caracterización de variaciones estructurales (SV) de alta confianza.
  • Análisis de la diversidad de SV, proporciones ancestrales e impactos regulatorios.

Principales resultados:

  • Se identificaron 9965 SV de alta confianza en uigures, de los cuales el 32% eran novedosos.
  • Los uigures exhiben una diversidad de transcripción de SV 1.19 veces mayor que las poblaciones ancestrales.
  • La diversidad de SV muestra una relación parabólica con las proporciones ancestrales, alcanzando un máximo con contribuciones equilibradas.
  • La mezcla crea puntos calientes de SV a través de la recombinación homóloga no alélica (NAHR).
  • El 60% de las SV posteriores a la mezcla están flanqueadas por repeticiones.
  • Las SV inducidas por la mezcla regulan desproporcionadamente la expresión génica y alteran las vías inmunitarias/metabólicas.
  • A pesar de la elevada diversidad de SV, la carga de variantes patógenas es comparable a la de las poblaciones ancestrales, lo que sugiere una amortiguación.
  • Las SV más jóvenes son más grandes, tienen impactos regulatorios más fuertes y una patogenicidad predicha más alta.

Conclusiones:

  • La mezcla poblacional actúa como una fuerza dual, impulsando la diversificación genómica y manteniendo el equilibrio funcional.
  • Las poblaciones mezcladas expanden la diversidad genómica más allá de los límites ancestrales a través de combinaciones de variantes novedosas.
  • Los enfoques conscientes de las SV son cruciales para la medicina genética, especialmente en poblaciones mezcladas.