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DEEL 3 gento samenvatting

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• Transductie : horizontale DNA-transfer via mechanisme van virusinfectie
• Gentransfer in vitro (celculturen) en in vivo (gentherapie toepassingen)
• Insertie van een transgen of omwisseling van virale sequenties voor een transgen
• Insertie door ligatie of homologe recombinatie
• Helper-onafhankelijk : kan zich autonoom repliceren + propageren
• Helper-afhankelijk : virale elementen moeten in trans voorzien worden

→ co-infectie met helpervirus ; helperplasmide voorzien of een ‘complementaire cellijn’ (ook ‘packaging’ cellijn)

• Vaak gewenst : afwezigheid van virale coderende sequenties → enkel amplicons

overhouden (cis-elementen)

voordelen : niet-cytotoxisch en grotere inserten mogelijk

• Keuze virale vector :
- afhankelijk van de te transformeren gastheer
- type expressie (stabiel - transiënt)
- hoeveelheid te verpakken DNA
- adenovirus - retrovirus - beperkte verpakkingscapaciteit (icosaëdrale hoofdjes)
- baculovirus - staafvormig - minder strikt

KEUZE VAN VIRALE VECTOREN (1)

Adenovirus

Voordeel:

- Zelf soortspecificiteit als celspecificiteit kiezen
- Niet geenvelopeerd virus met spike proteinen op 6 hoek. Deze spike proteines zijn belangrijk voor de
gastheer specificiteit. Deze spikeproteinen kunnen uitgewisseld worden. Bepalen soort- en cel
specificiteit

6.17




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