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2018 ; 29
(ä): 104-111
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Therapeutic Genome Editing With CRISPR/Cas9 in a Humanized Mouse Model
Ameliorates ?1-antitrypsin Deficiency Phenotype
#MMPMID29500128
Bjursell M
; Porritt MJ
; Ericson E
; Taheri-Ghahfarokhi A
; Clausen M
; Magnusson L
; Admyre T
; Nitsch R
; Mayr L
; Aasehaug L
; Seeliger F
; Maresca M
; Bohlooly-Y M
; Wiseman J
EBioMedicine
2018[Mar]; 29
(ä): 104-111
PMID29500128
show ga
?1-antitrypsin (AAT) is a circulating serine protease inhibitor secreted from the
liver and important in preventing proteolytic neutrophil elastase associated
tissue damage, primarily in lungs. In humans, AAT is encoded by the SERPINA1
(hSERPINA1) gene in which a point mutation (commonly referred to as PiZ) causes
aggregation of the miss-folded protein in hepatocytes resulting in subsequent
liver damage. In an attempt to rescue the pathologic liver phenotype of a mouse
model of human AAT deficiency (AATD), we used adenovirus to deliver Cas9 and a
guide-RNA (gRNA) molecule targeting hSERPINA1. Our single dose therapeutic gene
editing approach completely reverted the phenotype associated with the PiZ
mutation, including circulating transaminase and human AAT (hAAT) protein levels,
liver fibrosis and protein aggregation. Furthermore, liver histology was
significantly improved regarding inflammation and overall morphology in hSERPINA1
gene edited PiZ mice. Genomic analysis confirmed significant disruption to the
hSERPINA1 transgene resulting in a reduction of hAAT protein levels and
quantitative mRNA analysis showed a reduction in fibrosis and hepatocyte
proliferation as a result of editing. Our findings indicate that therapeutic gene
editing in hepatocytes is possible in an AATD mouse model.