CRISPR-Cas Flashcards

1
Q

herkomst + tekening

A
  • virussen infect bacterien
  • kleine fragmenten viraal genoom in eigen bacterieel genoom (spacers)
    p117
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2
Q

CRISPR

A

= clustered regulary interspaced short palindromic repeats
= prokaryotisch DNA met regelmatige herhalingen met spacergebieden tss CRISPR locus

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3
Q

Cas

A

CRISPR associated proteins
= coderen voor enzymen (DNA/RNA seq verknippen) obv herkenning spacers

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4
Q

natuurlijke werking CRISPR-Cas tekening

A

p118

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5
Q

rol cas

A

I: presentatie/integratie spacer in CRISPR locus
II: maturatie prematuur crRNA
III: binnenkomende invaderend viraal DNA/RNA verknippen tot inactief

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6
Q

CRISPR-Cas9 type II tekening

A

p119

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7
Q

PAM

A
  • natuurlijke herkomst inf virus op plasmide
    > geen deel bac genoom of CRISPR locus
    > essentieel voor onderscheiden self & non-self origineel systeem
  • nodig Cas9 te binden + knippen
  • 5’NNG3’ > 5’T/CG3’
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8
Q

CRISPR-Cas genome editing tekening

A

p119

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9
Q

crRNA

A

bevat gRNA dat doelwit DNA seq in gastheer localiseert

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10
Q

tracrRNA

A

bind crRNA > actief complex

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11
Q

sgRNA

A

combinatie tracrRNA & crRNA(‘s)

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12
Q

cas9

A

proteïne in actieve vorm DNA specifiek omvormen op specifieke herkenningsseq (versch. varianten)

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13
Q

repair template

A

DNA dat eventueel cellulair herstellingsproces begeleidt, laat insertie specifieke DNA seq toe

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14
Q

CRISPR-Cas plasmide

A
  • promotor (CMV)
  • tags
  • NLS = nuclear localisation signals (aan Cas9)
  • cas9 (naar nucleus > verknipping gDNA)
  • combinatieconstruct (H1 promotor+sgRNA+polA sig. exp. sgRNA)
  • pUC ori replicatie E.coli
  • KanR resistentie in prokaryoten selectie
    p120
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15
Q

tekening Cas9nuclease vs Ca9 nickase

A

p121

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16
Q

Cas9 null mutant

A
  • verb sgRNA door interactie tracrRNA
  • geen knipactiviteit
  • obv herkenning sgRNA met responselement als promotoractivatie of visualisatie responselementen
17
Q

toepassingen CRISPR-CAS

A
  • genactivatie
  • gene knock-out
  • genrepressie
  • genome wide screening
  • in beeld genomische loci
  • opzuivering DNA-EW mat anti-Cas9 AL seq nr beneden