Described herein are compositions and kits comprising recombinant adeno-associated viruses (rAAVs) with tropisms showing increased specificity and efficiency of viral transduction in targeted cell types such as the brain and lung. The rAAV compositions described herein also have tropisms showing decreased specificity and decreased efficiency of viral transduction in an off-target cell type such as the liver. The rAAV compositions described herein encapsidate a transgene, such as a therapeutic nucleic acid. Upon systemic delivery to a subject, the rAAV is capable of increased specificity and increased transduction of the transgene in a target cell-type, as compared to a parental or reference AAV.

Viral vectors comprising engineered hOTC DNA and RNA sequences are provided which when delivered to a subject in need thereof are useful for treating hyperammonemia, ornithine transcarbamylase transcarbamylase deficiency and symptoms associated therewith. Also provided are methods of using hOTC for treatment of liver fibrosis and/or cirrhosis in OTCD patients by administering hOTC.

Viral vectors comprising engineered hOTC DNA and RNA sequences are provided which when delivered to a subject in need thereof are useful for treating hyperammonemia, ornithine transcarbamylase deficiency and symptoms associated therewith. Also provided are methods of using hOTC for treatment of liver fibrosis cirrhosis in OTCD patients by administering hOTC.

The present invention relates to a method for preventing or treating cardiomyopathy due to energy failure in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of a vector which comprises a nucleic acid sequence of a gene that can restore energy failure. More particularly, the invention relates to a method for preventing or treating a cardiomyopathy associated with Friedreich ataxia in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of a vector which comprises a frataxin (FXN) encoding nucleic acid.

Non-viral delivery systems comprising engineered hOTC DNA and RNA sequences are provided which when delivered to a subject in need thereof are useful for treating hyperammonemia, ornithine transcarbamylase deficiency and symptoms associated therewith. Also provided are methods of using hOTC for treatment of liver fibrosis and/or cirrhosis in OTCD patients by administering hOTC.

Non-viral delivery systems comprising engineered hOTC DNA and RNA sequences are provided which when delivered to a subject in need thereof are useful for treating hyperammonemia, ornithine transcarbamylase deficiency and symptoms associated therewith. Also provided are methods of using hOTC for treatment of liver fibrosis and/or cirrhosis in OTCD patients by administering hOTC.

A method for preventing or treating cardiomyopathy due to energy failure in a subject in need thereof is provided. The method comprises administering to the subject a therapeutically effective amount of a vector which comprises a nucleic acid sequence encoding a gene that can reverse energy failure. An exemplary cardiomyopathy is that which is associated with Friedreich ataxia and an exemplary nucleic acid sequence comprises a nucleic acid that encodes frataxin (FXN).

The present invention relates to a method for preventing or treating cardiomyopathy due to energy failure in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of a vector which comprises a nucleic acid sequence of a gene that can restore energy failure. More particularly, the invention relates to a method for preventing or treating a cardiomyopathy associated with Friedreich ataxia in a subject in need thereof, comprising administering to said subject a therapeutically effective amount of a vector which comprises a frataxin (FXN) encoding nucleic acid.

Viral vectors comprising engineered hOTC DNA and RNA sequences are provided which when delivered to a subject in need thereof are useful for treating hyperammonemia, ornithine transcarbamylase transcarbamylase deficiency and symptoms associated therewith. Also provided are methods of using hOTC for treatment of liver fibrosis cirrhosis in OTCD patients by administering hOTC.

Non-viral delivery systems comprising engineered hOTC DNA and RNA sequences are provided which when delivered to a subject in need thereof are useful for treating hyperammonemia, ornithine transcarbamylase transcarbamylase deficiency and symptoms associated therewith. Also provided are methods of using hOTC for treatment of liver fibrosis and/or cirrhosis in OTCD patients by administering hOTC.