Tema 03: Bases genéticas del desarrollo

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8 Terms

1

Cromatina

ADN con proteínas histónicas y no histónicas. Se puede compactar en diferentes grados:

  • Eurocromatina: Ligeramente condensado.

  • Heterocomatina: Condensado.

  • Cromosoma: Mayor grado de condensación.

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2

Gen

Fragmento de ADN y unidad mínima de información genética heredable que se transmite por generaciones. Cada gen tiene una función especifica y puede expresarse de maneras distintas (alelo)

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3

Genoma

Conjunto de genes contenidos en cromosomas, es decir, la totalidad del material genético que posee un organismo.

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4

Potencialidad de las células

Totipotente: Puede dar origen a un organismo entero.

Pluripotente: Puede producir un tejido completo.

Multipotente: Puede producir una células específica de un tipo de tejido.

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5

Características de un cigoto

  • Totipotente

  • Único genoma

  • 20 000 genes diferentes

  • 200 tipos celulares

  • 100 000 proteínas diferentes

    • 42 millones de proteínas en cada célula.

    • 12 mil proteínas diferentes en cada célula.

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6

Cambios en la codificación

Editiding: Después de la formación de la proteína, se hace una modificación mediante la fosforilazión o ubiquitinación.

Splicing alternativo: Se eliminan todos los intrones y algunos exones.

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7

Factores de reprogramación

Reprogramación inducida: reinicia una célula diferenciada a una célula indiferenciada o célula madre pluripotente inducida (IPSC)

SOX2

C-HYK

KIF4

OCT4

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8

Potencialidad de las células

Cigoto: Totipotente

Blastocisto

  • Trofoblasto: multipotente

  • Embrioblasto: pluripotente

    Multipotentes:

    • endodermo

    • mesodermo

    • ectodermo

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