6. CRISPR ARRAY
• 23-47bpin length
• Some arepallindromicREPEATS
• 72bp or may be small
• Conform sequence specific immunity
• Phage or plasmid derived
SPACERS
• AT rich sequence of about 200-500bp
in length
• Consist of promoter necessary for
transcription of CRISPR array
LEADER
16. Design principle of a CRISPR/Cas9 expression
vector for construction of libraries
Heintze et al., 2013
17. Lead prospectus of CRISPR-Cas system
Genetic disease: Genetic retinal
disease by replacing dysfunctional
protein in photoreceptor cell (Flynn
et al., 2015).
Viral disease: HPV strain control by
inactivation of viral E7 gene (Liu et
al.,2015).
Cancer: Deletion of NANOG and
NANOGP8 in DU 145 prostate
cancer cell (Kamawaura et al.,
2015).
Cardiovascular disease:
Introduction of SERCA2a and
S100a1 gene. (Rincon et al., 2015
HIV: deletion of CCR 5 and expression
of CAR (Zhen et al., 2015).
19. Significance of CRISPR-Cas system
• Acts as endo-
nucleases and
make site specific
cuts
Cas9
• Combination of
crRNA and tracer
RNA
gRNA
• Gene insertion and
deletion can be
possible from
prokaryotesto
eukaryotes
Genome
editing