2A1 HC week 2 Flashcards

1
Q

transities

A

purine -> purine (A/G) of pyrimidine -> pyrimidine (C/T)

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2
Q

transversies

A

purine (A of G) -> pyrimidine (T of C) en vice versa

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3
Q

BER

A

enzymatisch proces, herstel kleine adducten
1. DNA glycosylase herkent DNA schade
2. endonuclease herkent AP site en knipt los
3. herstel door DNA polymerase en ligase

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4
Q

NER

A

herstel grote adducten

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5
Q

GGNER

A
  • eiwitten: XPC, CETN2, RAD23B binden op site
  • na herkenning ontkoppelt RAD23B zodat TF2H kan binden
  • TF2H knipt na verificatie streng eruit
  • DNA polymerase vult op
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6
Q

TcNER

A
  • CSB-eiwit herkent tijdens transcriptie schade
  • CSB duwt transcriptiecomplex terug
  • TF2H kan binden op site
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7
Q

defect NER

A
  • xeroderma pigmentosum (XP): defect NER
  • Cockane syndroom (CS): defect SCA en SCB
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8
Q

NHEJ

A
  • ligeren 2 uiteinden van streng
  • geen gebruik van template, onnauwkeurig (door verlies info op plaats van breuk)
  • resulteert in kleine deleties (radiosensitiviteit)
    1. schade wordt herkend door KU70/80 en DNA PKcs eiwitten
    2. XRCC4-DNA ligase 4 zorgt voor ligeren beide strengen
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9
Q

homologe recombinatie

A

uitwisseling DNA strengen, gebruik zusterchromatiden, nauwkeurig
* kan gepaard gaan met LOH

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10
Q
A
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