Genes no codificantes Flashcards

1
Q

Estructura PRIMARIA de g. no cod.

A

Cadena sencilla

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2
Q

Estructura SECUNDARIA de g. no cod.

A

Hairpins (3 - 10 nc)
Stem-loops (hasta miles de nc)

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3
Q

Estructura TERCIARIA de g. no cod.

A

Pseudoknot (2 stem y 2 loop)

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4
Q

snRNA

A

RNA nucleares pequeños
U1 U2 U4 U5 U6
107 - 205 nc
aso. snRNPs
Función: maduración RNA primario

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5
Q

snoRNA

A

RNA nucleolares pequeños
Función: precursores de rRNA

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6
Q

scaRNA

A

RNA pequeños de Cajal
Función: mod sn y sno

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7
Q

iRNA

A

RNA de interferencias
21 - 25 nc
Función: doble cadena que causa silenciamiento

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8
Q

Tipos de iRNA

A

siRNA (pequeño)
miRNA (micro)
piRNA (piwi interactivos)

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9
Q

lncRNA

A

RNA largos no cod
>2000 nc
Función: armazón / regulación de procesos

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10
Q

U1…

A

Corta en GU para slicing

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11
Q

U2…

A

Se une a branch point

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12
Q

Pasos de miRNA

A
  1. RNA pol-II sintetiza en nuc. (pri-miRNA)
  2. RNASEN / DROSHA corta pri-miRNA (5’ Cap y Poli-A 3’) y deja solo loop
  3. Salida a citoplasma (pre-miRNA)
  4. DICER corta loop (miRNA doble hebra)
  5. Agonauta degrada 1 de las 2 hebras
  6. RISC transporta a RNAm
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13
Q

¿miRNA necesita 100% de complementación para funcionar?

A

NO

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14
Q

miRNA basicamente…

A

Estorba la qlera

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15
Q

1990s miRNA

A

+ copias de gen productor de color y… ups salieron sin color WHAAAAAAAA?

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16
Q

1998 miRNA

A

introducción mini cadena complementaria para silenciamiento de proteinas específicas

17
Q

miRNA

A

21-23 nc en forma madura
Función: silenciamiento

18
Q

siRNA

A

21-25 pb (bicatenarios)
Extremos 3’ protuberantes
Función: Degradación RNAm

19
Q

Pasos de siRNA

A
  1. DICER corta extremos (necesitamos chiquitos)
  2. Argonauta divide y elimina cadena pasajera
  3. (RISC-siRNA) se une a cadena blanco
  4. Corte de RNA blanco
20
Q

¿siRNA necesita 100% de complementaridad con blanco?

A

SI

21
Q

siRNA basicamente…

A

Corta la qlerisima (degrada)