Cells,
Год журнала:
2024,
Номер
13(2), С. 159 - 159
Опубликована: Янв. 15, 2024
The
regulated
formation
and
resolution
of
R-loops
is
a
natural
process
in
physiological
gene
expression.
Defects
R-loop
metabolism
can
lead
to
DNA
replication
stress,
which
associated
with
variety
diseases
and,
ultimately,
cancer.
proteins
PARP1,
DIDO3,
DHX9
are
important
players
regulation.
We
previously
described
the
interaction
between
DIDO3
DHX9.
Here,
we
show
that,
mouse
embryonic
fibroblasts,
three
physically
linked
dependent
on
PARP1
activity.
C-terminal
truncation
leads
impairment
this
interaction;
concomitantly,
cells
increased
stress
senescence.
also
renders
partially
resistant
vitro
oncogenic
transformation,
an
effect
that
be
reversed
by
immortalization.
propose
form
ternary
complex
regulates
metabolism,
preventing
subsequent
Nucleic Acids Research,
Год журнала:
2023,
Номер
51(5), С. 2215 - 2237
Опубликована: Фев. 16, 2023
Abstract
PARP1
is
a
DNA-dependent
ADP-Ribose
transferase
with
ADP-ribosylation
activity
that
triggered
by
DNA
breaks
and
non-B
structures
to
mediate
their
resolution.
was
also
recently
identified
as
component
of
the
R-loop-associated
protein-protein
interaction
network,
suggesting
potential
role
for
in
resolving
this
structure.
R-loops
are
three-stranded
nucleic
acid
consist
RNA–DNA
hybrid
displaced
non-template
strand.
involved
crucial
physiological
processes
but
can
be
source
genome
instability
if
persistently
unresolved.
In
study,
we
demonstrate
binds
vitro
associates
R-loop
formation
sites
cells
which
activates
its
activity.
Conversely,
inhibition
or
genetic
depletion
causes
an
accumulation
unresolved
promotes
genomic
instability.
Our
study
reveals
novel
sensor
highlights
suppressor
Nucleic Acids Research,
Год журнала:
2023,
Номер
51(6), С. 2818 - 2837
Опубликована: Март 2, 2023
Abstract
Prolonged
pausing
of
the
transcription
machinery
may
lead
to
formation
three-stranded
nucleic
acid
structures,
called
R-loops,
typically
resulting
from
annealing
nascent
RNA
with
template
DNA.
Unscheduled
persistence
R-loops
and
polymerases
interfere
itself
other
essential
processes
such
as
DNA
replication
repair.
Senataxin
(SETX)
is
a
putative
helicase,
mutated
in
two
neurodegenerative
disorders,
which
has
been
implicated
control
R-loop
accumulation
termination.
However,
understanding
precise
role
SETX
these
precluded
by
absence
direct
characterisation
biochemical
activities.
Here,
we
purify
characterise
helicase
domain
parallel
its
yeast
orthologue,
Sen1.
Importantly,
show
that
bona
fide
ability
resolve
R-loops.
Furthermore,
retained
termination
activity
Sen1
but
functions
species-specific
manner.
Finally,
subsequent
variants
harbouring
disease-associated
mutations
shed
light
into
effect
on
folding
properties.
Altogether,
results
broaden
our
function
gene
expression
maintenance
genome
integrity
provide
clues
elucidate
molecular
basis
SETX-associated
diseases.
Abstract
The
cell
cycle
is
a
crucial
biological
process
that
involved
in
growth,
development,
and
reproduction.
It
can
be
divided
into
G1,
S,
G2,
M
phases,
each
period
closely
regulated
to
ensure
the
production
of
two
similar
daughter
cells
with
same
genetic
material.
However,
many
obstacles
influence
cycle,
including
R-loop
formed
throughout
this
process.
triple-stranded
structure,
composed
an
RNA:
DNA
hybrid
single
strand,
which
ubiquitous
organisms
from
bacteria
mammals.
existence
has
important
significance
for
regulation
various
physiological
processes.
aberrant
accumulation
due
its
limited
resolving
ability
will
detrimental
cells.
For
example,
damage
genomic
instability,
caused
by
R-loop,
activate
checkpoints
turn
induce
arrest
death.
At
present,
growing
number
factors
have
been
proven
prevent
or
eliminate
thereby
avoiding
mutations.
Therefore,
we
need
gain
detailed
insight
resolution
at
different
stages
cycle.
In
review,
review
current
knowledge
play
role
as
well
how
mutations
these
lead
onset
progression
diseases.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Янв. 8, 2024
Abstract
R-loops
that
accumulate
at
transcription
sites
pose
a
persistent
threat
to
genome
integrity.
PSIP1
is
chromatin
protein
associated
with
transcriptional
elongation
complex,
possesses
histone
chaperone
activity,
and
implicated
in
recruiting
RNA
processing
DNA
repair
factors
sites.
Here,
we
show
interacts
other
proteins
involved
R-loop
homeostasis,
including
PARP1.
Genome-wide
mapping
of
PSIP1,
γ-H2AX
PSIP1-depleted
human
mouse
cell
lines
revealed
an
accumulation
damage
gene
promoters
the
absence
PSIP1.
causes
local
arrest
transcription-replication
conflict,
leading
damage.
depletion
increases
53BP1
foci
reduces
RAD51
foci,
suggesting
altered
choice.
Furthermore,
sensitivity
cancer
cells
PARP1
inhibitors
DNA-damaging
agents
induce
R-loop-induced
These
findings
provide
insights
into
mechanism
through
which
maintains
integrity
site
transcription.
Biochimie,
Год журнала:
2023,
Номер
214, С. 176 - 192
Опубликована: Июль 8, 2023
Non-canonical
secondary
structures
(NCSs)
are
alternative
nucleic
acid
that
differ
from
the
canonical
B-DNA
conformation.
NCSs
often
occur
in
repetitive
DNA
sequences
and
can
adopt
different
conformations
depending
on
sequence.
The
majority
of
these
form
context
physiological
processes,
such
as
transcription-associated
R-loops,
G4s,
well
hairpins
slipped-strand
DNA,
whose
formation
be
dependent
replication.
It
is
therefore
not
surprising
play
important
roles
regulation
key
biological
processes.
In
last
years,
increasing
published
data
have
supported
their
role
thanks
to
genome-wide
studies
development
bioinformatic
prediction
tools.
Data
also
highlighted
pathological
structures.
Indeed,
alteration
or
stabilization
cause
impairment
transcription
replication,
modification
chromatin
structure
damage.
These
events
lead
a
wide
range
recombination
events,
deletions,
mutations
chromosomal
aberrations,
well-known
hallmarks
genome
instability
which
strongly
associated
with
human
diseases.
this
review,
we
summarize
molecular
processes
through
trigger
instability,
focus
G-quadruplex,
i-motif,
R-loop,
Z-DNA,
hairpin,
cruciform
multi-stranded
known
triplexes.
Journal of Molecular Biology,
Год журнала:
2023,
Номер
436(1), С. 168207 - 168207
Опубликована: Июль 20, 2023
Alternative
DNA
structures
that
differ
from
the
canonical
B-form
of
can
arise
repetitive
sequences
and
play
beneficial
roles
in
many
cellular
processes
such
as
gene
regulation
chromatin
organization.
However,
they
also
threaten
genomic
stability
several
ways
including
mutagenesis
collisions
with
replication
and/or
transcription
machinery,
which
lead
to
instability
is
associated
human
disease.
Thus,
careful
non-B-DNA
structure
formation
resolution
crucial
for
maintenance
genome
integrity.
Several
protein
factors
have
been
demonstrated
associate
alternative
facilitate
their
removal,
one
ADP-ribose
transferase
(ART)
PARP1
(also
called
ADP-ribosyltransferase
diphtheria
toxin-like
1
or
ARTD1),
a
multifaceted
repair
enzyme
recognizes
single-
double-stranded
breaks
synthesizes
chains
poly
(ADP-ribose)
(PAR)
recruit
proteins.
It
now
well
appreciated
nucleic
acid
beyond
lesions,
stalled
forks,
hairpins
cruciforms,
R-loops,
G-quadruplexes
(G4
DNA).
In
this
review,
we
summarize
current
evidence
direct
association
each
these
aforementioned
structures,
discuss
role
prevention
structure-induced
genetic
instability.
We
will
focus
on
mechanisms
recognition
binding
by
structure-based
stimulation
catalytic
activity
upon
binding.
Finally,
some
outstanding
gaps
literature
offer
speculative
insight
questions
remain
be
experimentally
addressed.
Genes & Development,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 10, 2024
Genome
integrity
relies
on
the
accuracy
of
DNA
metabolism,
but
as
appreciated
for
more
than
four
decades,
transcription
enhances
mutation
and
recombination
frequencies.
More
recent
research
provided
evidence
a
previously
unforeseen
link
between
RNA
which
is
often
related
to
accumulation
DNA–RNA
hybrids
R-loops.
In
addition
physiological
roles,
R-loops
interfere
with
replication
repair,
providing
molecular
scenario
origin
genome
instability.
Here,
we
review
current
knowledge
multiple
factors
that
prevent
or
resolve
consequent
transcription–replication
conflicts
thus
act
modulators
dynamics.