Frontiers in Cellular and Infection Microbiology,
Journal Year:
2021,
Volume and Issue:
10
Published: Jan. 28, 2021
Bacterial
and
archaeal
CRISPR-Cas
systems
offer
adaptive
immune
protection
against
foreign
mobile
genetic
elements
(MGEs).
This
function
is
regulated
by
sequence
specific
binding
of
CRISPR
RNA
(crRNA)
to
target
DNA/RNA,
with
an
additional
requirement
a
flanking
DNA
motif
called
the
protospacer
adjacent
(PAM)
in
certain
systems.
In
this
review,
we
discuss
how
same
fundamental
mechanism
RNA-DNA
and/or
RNA-RNA
complementarity
utilized
bacteria
regulate
two
distinct
functions:
ward
off
intruding
materials
modulate
diverse
physiological
functions.
The
best
documented
examples
alternate
functions
are
bacterial
virulence,
biofilm
formation,
adherence,
programmed
cell
death,
quorum
sensing.
While
extensive
between
crRNA
targeted
seems
constitute
efficient
phage
system,
partial
be
key
for
several
characterized
Cas
proteins
also
involved
sequence-specific
non-specific
cleavage
control
transcriptional
regulator
expression,
mechanisms
which
still
elusive.
Over
past
decade,
RNA-guided
targeting
auxiliary
have
been
transformed
into
powerful
gene
editing
biotechnological
tools.
We
provide
synopsis
technologies
review.
Even
abundant
mechanistic
insights
biotechnology
tools
that
currently
available,
discovery
new
types
holds
promise
future
technological
innovations,
will
pave
way
precision
genome
medicine.
Frontiers in Oncology,
Journal Year:
2020,
Volume and Issue:
10
Published: Aug. 7, 2020
A
series
of
recent
discoveries
harnessing
the
adaptive
immune
system
prokaryotes
to
perform
targeted
genome
editing
is
having
a
transformative
influence
across
biological
sciences.
The
discovery
Clustered
Regularly
Interspaced
Short
Palindromic
Repeats
(CRISPR)
and
CRISPR-associated
(Cas)
proteins
has
expanded
applications
genetic
research
in
thousands
labs
globe
redefining
our
approach
gene
therapy.
Traditional
therapy
raised
some
concerns,
as
its
reliance
on
viral
vector
delivery
therapeutic
transgenes
can
cause
both
insertional
oncogenesis
immunogenic
toxicity.
By
obliviating
concerns
by
traditional
therapy,
CRISPR
technology
provides
relatively
simple
efficient
alternative
for
site-specific
editing.
Although
it
apparent
advantages,
CRISPR/Cas9
brings
own
set
limitations
which
must
be
addressed
safe
clinical
translation.
This
review
focuses
evolution
role
shifting
paradigm.
We
emerging
data
trials
consider
best
strategy
move
forward
with
this
powerful
but
still
new
technology.
Molecular Cell,
Journal Year:
2021,
Volume and Issue:
81(20), P. 4333 - 4345.e4
Published: Sept. 3, 2021
Compact
and
versatile
CRISPR-Cas
systems
will
enable
genome
engineering
applications
through
high-efficiency
delivery
in
a
wide
variety
of
contexts.
Here,
we
create
an
efficient
miniature
Cas
system
(CasMINI)
engineered
from
the
type
V-F
Cas12f
(Cas14)
by
guide
RNA
protein
engineering,
which
is
less
than
half
size
currently
used
CRISPR
(Cas9
or
Cas12a).
We
demonstrate
that
CasMINI
can
drive
high
levels
gene
activation
(up
to
thousands-fold
increases),
while
natural
fails
function
mammalian
cells.
show
has
comparable
activities
Cas12a
for
activation,
highly
specific,
allows
robust
base
editing
editing.
expect
be
broadly
useful
cell
therapy
ex
vivo
vivo.
Nature Biotechnology,
Journal Year:
2021,
Volume and Issue:
40(1), P. 94 - 102
Published: Sept. 2, 2021
Abstract
Gene
therapy
would
benefit
from
a
miniature
CRISPR
system
that
fits
into
the
small
adeno-associated
virus
(AAV)
genome
and
has
high
cleavage
activity
specificity
in
eukaryotic
cells.
One
of
most
compact
CRISPR-associated
nucleases
yet
discovered
is
archaeal
Un1Cas12f1.
However,
Un1Cas12f1
its
variants
have
very
low
In
present
study,
we
redesigned
natural
guide
RNA
at
five
sites:
5′
terminus
trans
-activating
(tracrRNA),
tracrRNA–crRNA
complementary
region,
penta(uridinylate)
sequence,
3′
crRNA
disordered
stem
2
region
tracrRNA.
These
optimizations
synergistically
increased
average
indel
frequency
by
867-fold.
The
optimized
enabled
efficient,
specific
editing
human
cells
when
delivered
plasmid
vectors,
PCR
amplicons
AAV.
As
cleaves
outside
protospacer,
it
can
be
used
to
create
large
deletions
efficiently.
engineered
showed
efficiency
comparable
SpCas9
similar
AsCas12a.