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Ciencia básica y patogénesis

Penelope Benchek1, Christiane Reitz2, Sven-Thorsten Dietrich3

  • 1Department of Population & Quantitative Health Sciences, School of Medicine, Case Western Reserve University, Cleveland, OH, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 25, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Los estudios genéticos revelan un bajo riesgo compartido de la enfermedad de Alzheimer (EA) entre diversos grupos de ascendencia. Se requieren más identificaciones de factores genéticos específicos de la ascendencia para la EA.

Palabras clave:
enfermedad de Alzheimergenéticaascendenciariesgo genéticoherenciapolimorfismo de un solo nucleótidoestudio de asociación en todo el genomapoblaciones diversasfactores genéticoscorrelación genética

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Área de la Ciencia:

  • Genética; Neurociencia; Salud de la Población

Sus antecedentes:

  • La prevalencia de la enfermedad de Alzheimer (EA) y los factores de riesgo genético muestran una variación significativa en diversas poblaciones, incluidos los grupos blancos no hispanos (NHW), afroamericanos (AA), asiático-americanos (AsA) e hispanos/latinos (HL).
  • Las diferencias paradójicas en el tamaño del efecto de genes como APOE entre las ascendencias sugieren una heterogeneidad sustancial en la arquitectura genética de la EA.
  • Comprender las correlaciones genéticas entre los grupos de ascendencia es crucial para aprovechar la información genética en todas las poblaciones.

Objetivo del estudio:

  • Estimar la heredabilidad específica de la ascendencia de la EA.
  • Cuantificar la arquitectura genética compartida de la EA en diferentes grupos de ascendencia.
  • Identificar el grado de superposición genética en el riesgo de EA entre diversas poblaciones.

Principales métodos:

  • Se utilizó el conjunto de datos TOPMED imputado multiascendencia de la Alzheimer's Disease Genetics Consortium (ADGC) para los análisis.
  • Se calculó la heredabilidad específica de la ascendencia y se cuantificó la arquitectura genética compartida de la EA utilizando análisis GREML bivariados.
  • Se empleó un método que tiene en cuenta la arquitectura genética específica de la ascendencia, analizando variantes comunes (MAF>0,05) y ajustando por covariables.

Principales resultados:

  • Las estimaciones de heredabilidad basadas en SNP para la EA variaron según la ascendencia: AA (h²=0,13), NHW (h²=0,14), AsA (h²=0,29) y HL (h²=0,48).
  • El componente genético compartido (r_g) para la EA fue generalmente bajo a modesto entre los pares de ascendencia, que oscilaron entre el 13 % (AA/HL) y el 42 % (NHW/HL).
  • Específicamente, las estimaciones de r_g fueron: AA/HL (0,13), AA/AsA (0,17), HL/AsA (0,21), NHW/HL (0,28), NHW/AsA (0,32) y NHW/HL (0,42).

Conclusiones:

  • Si bien la patología de la EA es consistente, el impacto de las variaciones genéticas difiere significativamente entre los grupos de ascendencia.
  • El estudio encontró componentes genéticos compartidos de bajo a moderado para el riesgo de EA entre las ascendencias, lo que sugiere que estos pueden ser subestimados.
  • Quedan por descubrir contribuyentes genéticos específicos de la ascendencia significativos para el riesgo de EA.