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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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La medicina genómica: progreso, trampas y promesas

Jay Shendure1, Gregory M Findlay2, Matthew W Snyder2

  • 1Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA; Howard Hughes Medical Institute, Seattle, WA 98195, USA; Brotman Baty Institute for Precision Medicine, Seattle, WA 98195, USA.

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La medicina genómica es prometedora para transformar la atención médica, pero su impacto se está desarrollando de manera diferente y en una escala de tiempo más larga de lo esperado inicialmente. Una comprensión más profunda de las relaciones genotipo-fenotipo es crucial para realizar todo su potencial.

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Área de la Ciencia:

  • Medicina genómica
  • La genética humana
  • Investigaciones médicas

Sus antecedentes:

  • El Proyecto del Genoma Humano (HGP, por sus siglas en inglés) generó grandes expectativas de que la genómica revolucionara el diagnóstico, el tratamiento y la prevención de enfermedades.
  • La medicina genómica, un campo incipiente, se evalúa por sus avances y desafíos para cumplir estas expectativas.

Objetivo del estudio:

  • Evaluar el impacto actual y la trayectoria futura de la medicina genómica.
  • Identificar las áreas donde la genómica está teniendo éxito y donde está quedándose corta.
  • Para explorar desarrollos inesperados en el campo.

Principales métodos:

  • Esta perspectiva sintetiza el conocimiento actual y la opinión de los expertos sobre el progreso de la medicina genómica.
  • Implica una evaluación crítica de los éxitos, las limitaciones y las direcciones futuras de la aplicación de conocimientos genómicos a la práctica clínica.

Principales resultados:

  • La genómica está cumpliendo su promesa en áreas específicas, pero la transformación de la medicina es más compleja y larga de lo que se proyectó originalmente.
  • Han surgido acontecimientos imprevistos que exigen una reevaluación del camino a seguir.
  • El campo se enfrenta a desafíos en la traducción completa de datos genómicos en conocimientos clínicos procesables.

Conclusiones:

  • El optimismo inicial por el potencial transformador de la medicina genómica aún está justificado, aunque la línea de tiempo y la forma de su impacto están evolucionando.
  • Una comprensión fundamental de la relación genotipo-fenotipo completa es esencial para desbloquear todos los beneficios de la genómica humana.
  • Se recomienda un enfoque de "regreso a lo básico" centrado en la comprensión biológica fundamental para el avance de la medicina genómica.