What is the maximum payload length in bases typically delivered by AAV vectors?
Adeno-associated virus (AAV) vectors have an inherent packaging capacity and payload limit of approximately 4.7 to 5.0 kilobases (kb), which is a key physical constraint in gene therapy design[1][2]. This limited cargo space significantly restricts the delivery of large transgenes exceeding this capacity[3][4].
To navigate these packaging limits and accommodate larger genetic constructs, researchers utilize several strategies and design adjustments:
* Dual Vector Systems: Splitting larger transgenes across two vectors using approaches such as trans-splicing or Cre-lox recombination to reconstruct the functional gene inside target cells[5].
* Minigenes and Truncation: Creating shortened versions of genes that retain essential functional domains or removing non-essential regulatory and non-critical elements[6].
* Compact Regulatory Elements: Employing smaller promoters, efficient enhancers, and compact polyA signals to conserve space within the viral vector genome[7].
Would you like to explore how dual vector trans-splicing efficiency compares across different AAV serotypes?
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