Curative Ex Vivo Hepatocyte-Directed Gene Editing in a Mouse Model of Hereditary Tyrosinemia Type 1

Caitlin Vanlith, Rebekah Guthman, Clara T. Nicolas, Kari Allen, Zeji Du, Dong Jin Joo, Scott Nyberg, Joseph B. Lillegard, Raymond Hickey

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Hereditary tyrosinemia type 1 (HT1) is an autosomal recessive disorder caused by deficiency of fumarylacetoacetate hydrolase (FAH). It has been previously shown that ex vivo hepatocyte-directed gene therapy using an integrating lentiviral vector to replace the defective Fah gene can cure liver disease in small- and large-animal models of HT1. This study hypothesized that ex vivo hepatocyte-directed gene editing using CRISPR/Cas9 could be used to correct a mouse model of HT1, in which a single point mutation results in loss of FAH function. To achieve high transduction efficiencies of primary hepatocytes, this study utilized a lentiviral vector (LV) to deliver both the Streptococcus pyogenes Cas9 nuclease and target guide RNA (LV-Cas9) and an adeno-associated virus (AAV) vector to deliver a 1.2 kb homology template (AAV-HT). Cells were isolated from Fah-/- mice and cultured in the presence of LV and AAV vectors. Transduction of cells with LV-Cas9 induced significant indels at the target locus, and correction of the point mutation in Fah-/- cells ex vivo using AAV-HT was completely dependent on LV-Cas9. Next, hepatocytes transduced ex vivo by LV-Cas9 and AAV-HT were transplanted into syngeneic Fah-/- mice that had undergone a two-thirds partial hepatectomy or sham hepatectomy. Mice were cycled on/off the protective drug 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione (NTBC) to stimulate expansion of corrected cells. All transplanted mice became weight stable off NTBC. However, a significant improvement was observed in weight stability off NTBC in animals that received partial hepatectomy. After 6 months, mice were euthanized, and thorough biochemical and histological examinations were performed. Biochemical markers of liver injury were significantly improved over non-transplanted controls. Histological examination of mice revealed normal tissue architecture, while immunohistochemistry showed robust repopulation of recipient animals with FAH+ cells. In summary, this is the first report of ex vivo hepatocyte-directed gene repair using CRISPR/Cas9 to demonstrate curative therapy in an animal model of liver disease.

Original languageEnglish (US)
Pages (from-to)1315-1326
Number of pages12
JournalHuman Gene Therapy
Volume29
Issue number11
DOIs
StatePublished - Nov 1 2018

Keywords

  • hepatocytes, CRISPR/Cas9, hereditary tyrosinemia type 1, metabolic liver disease, gene therapy

ASJC Scopus subject areas

  • Molecular Medicine
  • Molecular Biology
  • Genetics

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    Vanlith, C., Guthman, R., Nicolas, C. T., Allen, K., Du, Z., Joo, D. J., Nyberg, S., Lillegard, J. B., & Hickey, R. (2018). Curative Ex Vivo Hepatocyte-Directed Gene Editing in a Mouse Model of Hereditary Tyrosinemia Type 1. Human Gene Therapy, 29(11), 1315-1326. https://doi.org/10.1089/hum.2017.252