Permanent inactivation of Huntington's disease mutation by personalized allele-specific CRISPR/Cas9.
Hum Mol Genet
; 25(20): 4566-4576, 2016 10 15.
Article
em En
| MEDLINE
| ID: mdl-28172889
ABSTRACT
A comprehensive genetics-based precision medicine strategy to selectively and permanently inactivate only mutant, not normal allele, could benefit many dominantly inherited disorders. Here, we demonstrate the power of our novel strategy of inactivating the mutant allele using haplotype-specific CRISPR/Cas9 target sites in Huntington's disease (HD), a late-onset neurodegenerative disorder due to a toxic dominant gain-of-function CAG expansion mutation. Focusing on improving allele specificity, we combined extensive knowledge of huntingtin (HTT) gene haplotype structure with a novel personalized allele-selective CRISPR/Cas9 strategy based on Protospacer Adjacent Motif (PAM)-altering SNPs to target patient-specific CRISPR/Cas9 sites, aiming at the mutant HTT allele-specific inactivation for a given diplotype. As proof-of-principle, simultaneously using two CRISPR/Cas9 guide RNAs (gRNAs) that depend on PAM sites generated by SNP alleles on the mutant chromosome, we selectively excised â¼44 kb DNA spanning promoter region, transcription start site, and the CAG expansion mutation of the mutant HTT gene, resulting in complete inactivation of the mutant allele without impacting the normal allele. This excision on the disease chromosome completely prevented the generation of mutant HTT mRNA and protein, unequivocally indicating permanent mutant allele-specific inactivation of the HD mutant allele. The perfect allele selectivity with broad applicability of our strategy in disorders with diverse disease haplotypes should also support precision medicine through inactivation of many other gain-of-function mutations.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Terapia Genética
/
Doença de Huntington
/
Expansão das Repetições de Trinucleotídeos
/
Sistemas CRISPR-Cas
/
Proteína Huntingtina
Limite:
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Hum Mol Genet
Assunto da revista:
BIOLOGIA MOLECULAR
/
GENETICA MEDICA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos