Neuropeptidergic regulation of insect diapause by the circadian clock
Current Opinion in Insect Science,
Journal Year:
2024,
Volume and Issue:
63, P. 101198 - 101198
Published: April 6, 2024
Diapause
is
an
endocrine-mediated
strategy
used
by
insects
to
survive
seasons
of
adverse
environmental
conditions.
Insects
living
in
temperate
zones
are
regularly
exposed
such
conditions
the
form
winter.
To
winter,
they
must
prepare
for
it
long
before
arrives.
A
reliable
indicator
impending
winter
shortening
day
length.
measure
length,
need
their
circadian
clock
as
internal
time
reference.
In
this
article,
I
provide
overview
current
state
knowledge
on
neuropeptides
that
link
diapause
inducing
hormonal
brain
centers.
Language: Английский
A clock for all seasons
Journal of Comparative Physiology A,
Journal Year:
2024,
Volume and Issue:
210(4), P. 473 - 480
Published: June 19, 2024
Abstract
Circadian
clocks
play
an
essential
role
in
adapting
locomotor
activity
as
well
physiological,
and
metabolic
rhythms
of
organisms
to
the
day-night
cycles
on
Earth
during
four
seasons.
In
addition,
they
can
serve
a
time
reference
for
measuring
day
length
adapt
advance
annual
changes
environment,
which
be
particularly
pronounced
at
higher
latitudes.
The
physiological
responses
are
also
known
photoperiodism.
This
special
issue
Journal
Comparative
Physiology
A
aims
account
diurnal
photoperiodic
adaptations
by
presenting
collection
ten
review
articles,
five
original
research
three
perspective
pieces.
contributions
include
historical
accounts,
circadian
clock
models,
epigenetic,
molecular,
neuronal
mechanisms
seasonal
adaptations,
latitudinal
differences
studies
wild
that
address
challenges
global
change.
Language: Английский
Photoperiodic plasticity of pigment-dispersing factor immunoreactive fibers projecting toward prothoracicotropic hormone neurons in flesh fly Sarcophaga similis larvae
Journal of Comparative Physiology A,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 15, 2025
Larvae
of
the
flesh
fly,
Sarcophaga
similis
exhibit
photoperiodic
responses
to
control
pupal
diapause.
Although
external
coincidence
model
is
applicable
S.
photoperiodism,
it
remains
unknown
how
circadian
clock
system
integrates
day-length
information.
To
explore
mechanisms,
we
examined
neural
circuitry
involving
lateral
neurons
(LNs)
and
prothoracicotropic
hormone
(PTTH)
neurons.
We
also
effects
on
LN-fiber
patterns
in
third-instar
larvae.
Immunohistochemistry
showed
that
protein
PERIOD
neuropeptide
pigment-dispersing
factor
(PDF)
were
co-localized
four
cells
per
brain
hemisphere,
named
these
PDF-LNs
similis.
Single-cell
polymerase
chain
reaction
backfilled
from
ring
gland
two
pairs
pars
lateralis
with
contralateral
axons
(PL-c
neurons)
expressed
ptth.
Double
labeling
immunohistochemistry
backfills
revealed
PDF-immunoreactive
varicose
fibers
projected
close
PL-c
short
f
(snpf)
receptor
glutamate-gated
chloride
channel
but
not
pdf
sNPF
L-glutamate
PDF
acutely
inhibited
spontaneous
firing
activity
The
number
varicosities
dorsal
protocerebrum
was
significantly
higher
under
short-day
than
long-day
conditions
a
time-dependent
manner.
These
results
suggest
and/or
glutamate
signaling
PTTH
form
potential
circuity
for
diapause
photoperiod
modifies
connectivity
strength
between
their
post-
or
pre-neurons
circuitry.
Language: Английский
A Head‐Specific Transcriptomic Study Reveals Key Regulatory Pathways for Winter Diapause in the Mosquito Culex pipiens
Archives of Insect Biochemistry and Physiology,
Journal Year:
2025,
Volume and Issue:
118(2)
Published: Feb. 1, 2025
ABSTRACT
The
primary
vector
of
the
West
Nile
virus,
Culex
pipiens
,
undergoes
reproductive
dormancy
during
adverse
winter
season.
While
our
current
understanding
has
mainly
focused
on
cellular
signals
and
phenotypic
shifts
occurring
at
a
global
scale
diapause,
information
tissue‐specific
transcriptomic
changes
remains
limited.
This
knowledge
gap
is
major
challenge
in
interpreting
regulatory
mechanisms
tissue
level.
To
address
this,
present
work
utilized
RNA‐seq
technology
to
investigate
transcriptional
head
that
house
brain
crucial
endocrinal
organs
such
as
corpora
allata.
We
obtained
RNA
samples
from
heads
diapausing
nondiapausing
female
mosquitoes
two
specific
time
intervals,
ZT0
ZT16,
then
subjected
them
sequencing.
Our
results
revealed
differences
differentially
expressed
genes
between
diapause
non‐diapause
highlighting
diel
variations
gene
expression.
also
selected
twelve
associated
with
phenotype
examined
transcript
abundance
six
different
points
over
24
h.
qRT‐PCR
analysis
showed
similar
up‐
downregulation
transcripts
nondiapause
phenotypes
thus
validating
RNA‐seq.
In
summary,
study
identified
new
differentiation
their
expression,
potentially
linking
photoperiod
seasonal
insects.
newly
presented
will
significantly
advance
head‐specific
for
insect
diapause.
Language: Английский
Erwin Bünning and Wolfgang Engelmann: establishing the involvement of the circadian clock in photoperiodism
Journal of Comparative Physiology A,
Journal Year:
2024,
Volume and Issue:
210(4), P. 481 - 493
Published: May 28, 2024
In
1936,
Erwin
Bünning
published
his
groundbreaking
work
that
the
endogenous
clock
is
used
to
measure
day
length
for
initiating
photoperiodic
responses.
His
publication
triggered
years
of
controversial
debate
until
it
ultimately
became
basic
axiom
rhythm
research
and
theoretical
pillar
chronobiology.
Bünning's
thesis
frequently
quoted
in
articles
this
special
issue
on
subject
"A
all
seasons".
However,
nowadays
only
few
people
know
detail
about
experiments
almost
nobody
knows
contribution
former
doctoral
student,
Wolfgang
Engelmann,
theory
because
most
topic
German.
The
aim
review
give
an
overview
important
at
time,
including
Engelmann's
thesis,
which
he
demonstrated
importance
circadian
flower
induction
Flaming
Katy,
Kalanchoë
blossfeldiana,
but
not
Red
Morning
Glory,
Ipomoea
coccinea.
Language: Английский
One seasonal clock fits all?
Journal of Comparative Physiology A,
Journal Year:
2023,
Volume and Issue:
210(4), P. 641 - 647
Published: Nov. 10, 2023
Adaptation
of
physiology
and
behavior
to
seasonal
changes
in
the
environment
are
for
many
organisms
essential
survival.
Most
our
knowledge
about
underlying
mechanisms
comes
from
research
on
photoperiodic
regulation
reproduction
plants,
insects
mammals.
However,
even
humans,
who
mostly
live
environments
with
minimal
influences,
show
annual
rhythms
(e.g.,
immune
activity,
brain
function),
sleep-wake
cycles)
disease
prevalence
infectious
diseases).
As
variations
environmental
conditions
may
be
drastically
altered
due
climate
change,
understanding
adaptation
becomes
more
relevant.
While
species
have
developed
specific
solutions
dedicated
tasks
regulation,
we
find
a
number
common
principles
when
comparing
insect
mammalian
systems:
(1)
circadian
system
contributes
regulation;
(2)
similar
signaling
molecules
(VIP
PDF)
used
transferring
information
neuroendocrine
controlling
response;
(3)
hormone
melatonin
participates
as
well
mammals;
(4)
photoperiod
affect
neurotransmitter
function
both
animal
groups.
The
few
examples
overlap
elaborated
this
perspective
article,
discussion
relevance
should
seen
encouragement
unravel
machinery
multitude
organisms.
Language: Английский
Photoperiodic plasticity of pigment-dispersing factor immunoreactive fibers projecting toward prothoracicotropic hormone neurons in flesh fly Sarcophaga similis larvae
Research Square (Research Square),
Journal Year:
2024,
Volume and Issue:
unknown
Published: May 31, 2024
Abstract
Larvae
of
the
flesh
fly,
Sarcophaga
similis
exhibit
photoperiodic
responses
to
control
pupal
diapause.
Although
external
coincidence
model
is
applicable
S.
responses,
it
remains
unknown
how
circadian
clock
system
integrates
day-length
information.
To
explore
mechanisms
underlying
diapause,
we
examined
neural
circuitry
involving
lateral
neurons
(LNs)
and
prothoracicotropic
hormone
(PTTH)
neurons,
latter
possibly
controlling
ecdysteroid
production.
We
also
effects
on
LN-fiber
patterns
in
third-instar
larvae.
Immunohistochemistry
showed
that
PERIOD
a
neuropeptide
pigment-dispersing
factor
(PDF)
were
co-localized
four
cells
per
hemisphere,
named
these
PDF-LNs
similis.
Single-cell
polymerase
chain
reaction
backfilled
from
ring
gland
two
pairs
pars
lateralis
with
contralateral
axons
(PL-c
neurons)
expressed
ptth.
Double
labeling
immunohistochemistry
backfills
revealed
PDF-immunoreactive
varicose
fibers
projected
proximity
PL-c
neurons.
However,
pdf
receptor
was
not
but
glutamate-gated
chloride
channel
most
L-glutamate
PDF
acutely
inhibited
spontaneous
firing
activity
The
number
varicosities
dorsal
protocerebrum
significantly
higher
under
short-day
than
long-day
conditions
time-dependent
manner.
These
results
suggest
PDF-LNs,
PTTH
glutamate
signaling
form
potential
circuity
for
diapause
photoperiod
modifies
connectivity
strength
between
their
post-
or
pre-neurons
circuitry.
Language: Английский
Clocks at a snail pace: biological rhythms in terrestrial gastropods
PeerJ,
Journal Year:
2024,
Volume and Issue:
12, P. e18318 - e18318
Published: Oct. 29, 2024
Biological
rhythms
are
ubiquitous
across
the
tree
of
life.
Organisms
must
allocate
their
activities
into
moments
day
and
season
that
will
increase
probability
surviving
reproducing,
which
is
done
in
form
daily
annual
rhythms.
So
far,
vast
majority
studies
on
biological
have
focused
classical
laboratory
model
species.
Still,
use
non-model
species
gaining
traction,
as
part
an
effort
to
achieve
a
more
holistic
understanding
clock/calendar
mechanisms
"real
world"
but
this
requires
can
be
studied
both
lab
nature.
Terrestrial
gastropods,
Language: Английский
Differential effects of photophase on the reproductive behaviour of two species of medico‐legal relevance, Peckia (Peckia) chrysostoma (Wiedemann, 1830) and Peckia (Sarcodexia) lambens (Wiedemann, 1830) (Diptera: Sarcophagidae)
Medical and Veterinary Entomology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 27, 2024
The
nocturnal
behaviour
and
reproduction
patterns
of
Sarcophagidae
species
during
the
scotophase
are
largely
unexplored
for
in
Neotropical
region.
aim
this
study
was
to
assess
light
regimes
under
which
females
Peckia
(Peckia)
chrysostoma
(Wiedemann,
1830)
(Sarcodexia)
lambens
would
larviposit
understand
how
these
variables
influence
intrauterine
development
flies.
experiments
were
conducted
an
experimental
room
(lux
=
100)
two
independent
experiments:
I.
Larviposition
test:
Females
mated
with
males
over
8
days
old.
II.
Intrauterine
old
individually
isolated.
Both
performed
photophases
(L:D)
0:24,
6:18;
12:12;
18:6
24:0
a
period
96
h.
occurred
total
darkness
P.
(P.)
(S.)
all
treatments,
without
significant
differences
among
photophase
treatments
(p
>
0.05).
Photophase
influenced
timing
larviposition,
occurring
as
early
24
h
12:12
L:D
conditions,
while
no
larviposition
observed
first
0:24
treatment
either
species.
duration
significantly
affected
percentage
gravid
both
<
0.05),
higher
percentages
longer
duration.
at
initial
intermediate
stages
egg
more
strongly
associated
continuous
(0:24)
or
short
(6:18),
whereas
advanced
stage
prevalent
treatment.
implications
findings
forensic
entomology
profound,
challenging
conventional
knowledge
by
revealing
that
necrophagous
insects
not
limited
diurnal
activity
patterns.
Language: Английский