The promise of genetic medicine, fulfilled

We are combining the efficacy, safety and scalability of RNA therapeutics with the durability of gene therapies. 

Addition's all-RNA, LNP-based PRINT™ technology is designed to express therapeutic proteins for both genetic and non-genetic diseases.

Not just a better rare disease therapy - with PRINT, Addition also aims to make common diseases addressable with genetic medicine.

Addition's all-RNA, LNP-based PRINT™ technology is designed to express therapeutic proteins for both genetic and non-genetic diseases.

Not just a better rare disease therapy - with PRINT, Addition also aims to make common diseases addressable with genetic medicine.

Addition's all-RNA, LNP-based PRINT™ technology is designed to express therapeutic proteins for both genetic and non-genetic diseases.

Not just a better rare disease therapy - with PRINT, Addition also aims to make common diseases addressable with genetic medicine.

Addition's all-RNA, LNP-based PRINT™ technology is designed to express therapeutic proteins for both genetic and non-genetic diseases.

Not just a better rare disease therapy - with PRINT, Addition also aims to make common diseases addressable with genetic medicine.

1/4
  • PRECISE

    Precise and accurate insertion improves safety.

  • RNA-mediated

    RNA and LNP components are hypoimmune with understood manufacturing and proven delivery.

  • INSERTION OF

    Permanent insertion produces durable effect.

  • TRANSGENES

    Ability to express any transgene gives broad therapeutic opportunity.

PRINT Platform

The unified PRINT platform simplifies drug development.

Only the genetic sequence in the template RNA varies across PRINTed medicines. All other components remain the same.
With a target site conserved across animal species, surrogate reagents are a thing of the past.

Everyday biology, extraordinary outcomes.

We co-opt a natural, evolutionarily optimized mechanism taking place in our bodies every day -- retrotransposition -- to drive site-specific insertion of therapeutic transgenes. Known as “selfish DNA”, normal retrotransposons excel at copying themselves. The key innovation behind PRINT is re-educating them to be selfless instead.

Once released into the cytoplasm, one PRINT RNA is translated to make a retrotransposase; the other is bound by this enzyme and destined to become the inserted transgene. Only this RNA is bound by the retrotransposase because only this RNA contains a special sequence - transplanted from the normal retrotransposase RNA - that marks it as a PRINT substrate, breaking the cycle of selfishness. After safe insertion, the transgene goes to work, driving durable protein expression and therapeutic effect - and bringing the promise of genetic medicine to life.