New insights into the molecular phylogeny, biogeographical history, and diversification of Amblyomma ticks (Acari: Ixodidae) based on mitogenomes and nuclear sequences
Parasites & Vectors,
Год журнала:
2024,
Номер
17(1)
Опубликована: Март 18, 2024
Abstract
Background
Amblyomma
is
the
third
most
diversified
genus
of
Ixodidae
that
distributed
across
Indomalayan,
Afrotropical,
Australasian
(IAA),
Nearctic
and
Neotropical
biogeographic
ecoregions,
reaching
in
Neotropic
its
highest
diversity.
There
have
been
hints
previously
published
phylogenetic
trees
from
mitochondrial
genome,
nuclear
rRNA,
combinations
both
morphology
or
plus
species
southern
cone
South
America,
might
be
sister-group
to
rest
world.
However,
a
stable
framework
for
better
understanding
patterns
underpinning
diversification
lacking.
Methods
We
used
genomic
techniques
sequence
complete
nearly
genomes
–ca.
15
kbp–
as
well
ribosomal
cluster
8
17
ticks
order
study
phylogeny
pattern
,
with
particular
emphasis
on
region.
The
new
information
generated
here
together
available
43
(22
other
21
hard
ticks–as
outgroup–)
were
perform
probabilistic
methods
inferences
time-tree
estimation
using
dates.
Results
In
present
paper,
we
strongest
evidence
yet
may
indeed
world
(species
occur
mainly
Afrotropical
zoogeographic
regions).
Our
results
showed
all
subgenera
(
Cernyomma
Anastosiella
Xiphiastor
Adenopleura
Aponomma
Dermiomma
)
are
not
monophyletic,
except
Walkeriana
.
Likewise,
our
best
scenario
supports
origin
posterior
hemisphere
at
47.8
36.8
Mya,
respectively.
This
could
associated
end
connection
Australasia
ecoregions
by
Antarctic
land
bridge.
Also,
analyses
let
us
see
colonization
some
neotropical
Nearctic.
Conclusions
found
strong
main
theater
was
hemisphere,
potentially
driven
Bridge's
intermittent
late
Eocene.
addition,
subgeneric
classification
lacks
evolutionary
support.
Future
studies
denser
taxonomic
sampling
lead
findings
relationships
history
genus.
Graphical
Язык: Английский
Intra- and interspecific variation of Amblyomma ticks from southern Africa
Parasites & Vectors,
Год журнала:
2024,
Номер
17(1)
Опубликована: Авг. 28, 2024
Amblyomma
spp.
ticks,
known
for
their
long
mouthparts,
bright
ornate
appearance
and
aggressive
hunting
behaviour,
are
vectors
of
a
number
important
pathogens.
In
southern
Africa,
17
currently
documented.
Of
these
species,
hebraeum
variegatum
have
been
well
studied
due
to
wide
geographical
range
status
as
competent
pathogens
that
veterinary
medical
importance.
Studies
on
other
in
Africa
neglected,
fostering
ongoing
debates
the
validity
certain
species
such
pomposum.
This
study
investigated
inter-
intra-species
variation
ticks
collected
focusing
resolving
dispute
about
A.
pomposum
being
distinct
species.
Язык: Английский
Molecular Detection and Phylogenetic Characterization of Rickettsia in Ticks Collected from Leopard Tortoise (Geochelone pardalis) in rural Zambia
Science in One Health,
Год журнала:
2024,
Номер
3, С. 100074 - 100074
Опубликована: Янв. 1, 2024
In
sub-Saharan
Africa,
limited
studies
have
investigated
zoonotic
pathogens
that
may
be
harboured
by
ticks
infesting
reptiles
such
as
tortoises.
Here,
we
report
the
presence
of
pathogenic
Rickettsia
in
(Amblyomma
marmoreum)
collected
from
leopard
tortoise
(Geochelone
pardalis)
rural
Zambia.
Using
polymerase
chain
reaction,
56%
(49/87)
were
positive
for
outer
membrane
protein
(ompB)
gene.
Multi-locus
sequence
and
phylogenetic
analysis
based
on
ompB,
ompA,
citrate
synthase
(gltA)
genes
showed
carried
africae,
other
spp.
closely
related
to
R.
raoultii,
massiliae,
tamurae
monacensis.
Given
proximity
between
humans,
livestock,
wildlife
these
habitats,
there
exists
a
considerable
risk
transmission
human
populations
this
setting.
These
results
call
heightened
awareness
further
research
into
dynamics
tick-borne
diseases
regions
where
humans
animals
coexist,
particularly
context
tortoise-associated
vectors.
Understanding
addressing
potential
disease
vectors
is
crucial
effective
public
health
measures
prevention
zoonoses.
Язык: Английский
Amblyomma sparsum Neumann 1899 on migratory birds from Africa: First records in Italy
Ticks and Tick-borne Diseases,
Год журнала:
2024,
Номер
15(6), С. 102387 - 102387
Опубликована: Авг. 7, 2024
Migratory
birds
play
an
important
role
in
transporting
ixodid
ticks
and
tick-borne
pathogens
between
continents.
During
the
Boreal
spring,
migratory
reach
Europe,
mainly
from
sub-Saharan
Africa
or
northern
African
countries
but
not
much
is
known
about
diversity
ecology
of
they
spread.
From
2017
to
2022,
framework
two
consecutive
projects
focused
on
sampling
a
total
27
immature
Amblyomma
were
collected
birds,
belonging
8
species,
captured
Island
Ventotene,
stop-over
site
Mediterranean
Sea.
In
absence
adult
specimens,
morphological
identification
was
limited
assigning
these
genus.
this
study,
sequencing
comparative
analysis
three
mitochondrial
molecular
markers
(12S
rDNA,
16S
COI)
performed
achieve
taxonomic
identification.
Sequences
obtained
Ventotene
specimens
matched
at
100%
identity
with
sparsum.
conclusion,
study
documented
that
stages
species
marmoreum
complex
reached
Pontine
Islands
for
six
years.
The
entry
alien
tick
their
potentially
transmitted
deserves
further
also
light
globally
ongoing
climate
change.
Язык: Английский
Prevalence and diversity of spotted fever group Rickettsia species in ixodid ticks from domestic dogs in Chad, Africa
Ticks and Tick-borne Diseases,
Год журнала:
2024,
Номер
15(6), С. 102405 - 102405
Опубликована: Окт. 19, 2024
Tick-borne
pathogens
in
the
genus
Rickettsia
are
causative
agents
of
severe
and
potentially
fatal
spotted
fever
group
(SFG)
typhus
diseases
dogs
humans.
Climate,
habitat,
land-use
changes
impacting
vector
ranges,
with
expansions
resulting
novel
being
introduced
into
naïve
locations.
Despite
public
health
importance
SFG
Rickettsia,
there
relatively
few
data
on
prevalence
diversity
rickettsial
sub-Saharan
Africa.
The
aim
this
study
was
to
characterize
ixodid
ticks
(104
Amblyomma
spp.,
160
Rhipicephalus
one
Hyalomma
truncatum)
collected
from
domestic
Chad,
Ticks
were
screened
for
spp.
using
a
nested
PCR
targeting
17-kDa
gene.
Species
identification
through
bidirectional
Sanger
sequencing
17-kDa,
ompA,
ompB,
and/or
gltA
gene
targets.
A
total
43.3
%
(115/265)
positive
six
species
identified:
R.
africae,
massiliae,
conorii,
felis,
monacensis
Candidatus
muridii.
Seven
additional
samples
undetermined
species.
an
important
zoonotic
pathogen,
found
81
(79/97)
A.
variegatum
29
(2/7)
marmoreum
complex
species,
that
infests
wide
range
birds
mammals,
including
Finally,
we
detected
high
most
which
zoonotic,
Rh.
muhsamae.
Collectively
these
indicate
is
risk
rickettsiosis
Chad
further
studies
region
warranted.
Язык: Английский