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Development of an mRNA replacement therapy for phenylketonuria
Carlos G Perez-Garcia1, Ramon Diaz-Trelles1, Jerel Boyd Vega1
1Arcturus Therapeutics, Inc., 10628 Science Center Drive, Suite 250, San Diego, CA 92121, USA.
Molecular Therapy. Nucleic Acids
|March 31, 2022
Summary
Phenylketonuria (PKU) is a metabolic disorder. mRNA therapy delivering human PAH protein successfully restored phenylalanine metabolism in a PKU mouse model, offering a potential new treatment.
Area of Science:
- Biochemistry
- Genetics
- Therapeutics
Background:
- Phenylketonuria (PKU) is an inherited metabolic disorder.
- It results from phenylalanine hydroxylase (PAH) gene mutations, leading to toxic phenylalanine accumulation and intellectual disability.
- Current treatments are limited.
Purpose of the Study:
- To investigate mRNA replacement therapy for PKU.
- To evaluate the efficacy of lipid nanoparticle-delivered mRNA encoding human PAH (hPAH) in a mouse model.
Main Methods:
- Developed LUNAR lipid nanoparticles encapsulating hPAH mRNA.
- Administered LUNAR-hPAH via intravenous infusion to Pah(enu2) mice.
- Assessed hPAH protein expression and Phe metabolism restoration.
Main Results:
- Successful delivery of hPAH mRNA to hepatocytes.
- High levels of hPAH protein expression observed.
- Restoration of phenylalanine metabolism in the treated mouse model.
- Normalization of hyperphenylalanemia and hypotyrosinemia.
Conclusions:
- mRNA replacement therapy is a viable strategy for PKU.
- LUNAR-hPAH demonstrated proof of principle in a PKU mouse model.
- This approach holds promise for treating PKU and similar genetic disorders.
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