Pervasive gene flow despite strong and varied reproductive barriers in swordtails
Nature Ecology & Evolution,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
Abstract
The
evolution
of
reproductive
barriers
leads
to
the
formation
new
species.
However,
recent
research
has
demonstrated
that
hybridization
been
pervasive
across
tree
life
even
in
presence
strong
barriers.
Using
swordtail
fishes
(genus
Xiphophorus
),
an
emerging
model
system,
we
document
overlapping
mechanisms
act
as
gene
flow
between
birchmanni
and
cortezi
by
combining
genomic
sequencing
from
natural
hybrid
populations,
experimental
laboratory
crosses,
behavioural
assays,
sperm
measures
developmental
studies.
We
show
assortative
mating
plays
a
role
maintaining
subpopulations
with
distinct
ancestry
within
populations.
F
2
hybrids
identify
several
regions
strongly
impact
viability.
Strikingly,
two
these
underlie
genetic
incompatibilities
X.
its
sister
species
malinche
.
Our
results
demonstrate
ancient
played
origin
this
shared
incompatibility.
Moreover,
mismatch
at
incompatible
remarkably
similar
consequences
for
phenotypes
survival
×
hybrids.
findings
varied
shape
exchange
naturally
hybridizing
highlight
complex
evolutionary
outcomes
hybridization.
Язык: Английский
The extent of introgression between incipient Clarkia species is determined by temporal environmental variation and mating system
Proceedings of the National Academy of Sciences,
Год журнала:
2024,
Номер
121(12)
Опубликована: Март 11, 2024
Introgression
is
pervasive
across
the
tree
of
life
but
varies
taxa,
geography,
and
genomic
regions.
However,
factors
modulating
this
variation
how
they
may
be
affected
by
global
change
are
not
well
understood.
Here,
we
used
200
genomes
a
15-y
site-specific
environmental
dataset
to
investigate
effects
mating
system
divergence
on
magnitude
introgression
between
recently
diverged
outcrosser-selfer
pair
annual
plants
in
genus
Clarkia
.
These
sister
taxa
very
subsequently
came
into
secondary
sympatry
where
form
replicated
contact
zones.
Consistent
with
observations
other
pairs,
found
that
was
asymmetric
substantially
more
from
selfer
outcrosser.
This
asymmetry
caused
bias
direction
initial
F1
hybrid
formation
subsequent
backcrossing.
We
also
extensive
outcrosser’s
admixture
proportion
among
zones,
which
predicted
nearly
entirely
interannual
variance
spring
precipitation.
Greater
fluctuations
precipitation
resulted
higher
proportions,
likely
mediated
expression
traits
determine
premating
reproductive
isolation.
Climate-driven
hybridization
dynamics
particularly
change,
potentially
reshaping
species
boundaries
adaptation
novel
environments.
Язык: Английский
Pervasive gene flow despite strong and varied reproductive barriers in swordtails
bioRxiv (Cold Spring Harbor Laboratory),
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 20, 2024
One
of
the
mechanisms
that
can
lead
to
formation
new
species
occurs
through
evolution
reproductive
barriers.
However,
recent
research
has
demonstrated
hybridization
been
pervasive
across
tree
life
even
in
presence
strong
Swordtail
fishes
(genus
Язык: Английский
Admixture mapping reveals evidence for multiple mitonuclear incompatibilities in swordtail fish hybrids
Nemo V. Robles,
Ben Moran,
María José Rodríguez-Barrera
и другие.
bioRxiv (Cold Spring Harbor Laboratory),
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 31, 2025
Abstract
How
barriers
to
gene
flow
arise
between
closely
related
species
is
one
of
the
oldest
questions
in
evolutionary
biology.
Classic
models
biology
predict
that
negative
epistatic
interactions
variants
genomes
diverged
lineages,
known
as
hybrid
incompatibilities,
will
reduce
viability
or
fertility
hybrids.
The
genetic
architecture
these
and
paths
through
which
they
have
profound
implications
for
efficacy
incompatibilities
species.
While
been
studied
using
theoretical
approaches
several
decades,
only
recently
has
it
become
possible
map
larger
numbers
empirically.
Here,
we
use
admixture
mapping
natural
populations
swordtail
fish
(
Xiphophorus
)
identify
involving
mitochondrial
nuclear
genomes.
We
find
at
least
nine
regions
genome
are
involved
mitonuclear
vary
their
architecture,
strength
selection
experience,
degree
limit
populations.
Our
results
build
a
deeper
understanding
complex
against
naturally
hybridizing
highlight
an
important
role
evolution
reproductive
Язык: Английский
Hybridization contributes to reproductive isolation
Nature Ecology & Evolution,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 26, 2025
Язык: Английский
Fluctuating reproductive isolation and stable ancestry structure in a fine-scaled mosaic of hybridizing Mimulus monkeyflowers
PLoS Genetics,
Год журнала:
2025,
Номер
21(3), С. e1011624 - e1011624
Опубликована: Март 31, 2025
Hybridization
among
taxa
impacts
a
variety
of
evolutionary
processes
from
adaptation
to
extinction.
We
seek
understand
both
patterns
hybridization
across
and
the
ecological
forces
driving
those
patterns.
To
this
end,
we
use
whole-genome
low-coverage
sequencing
458
wild-grown
1565
offspring
individuals
characterize
structure,
stability,
mating
dynamics
admixed
populations
Mimulus
guttatus
nasutus
decade
sampling.
In
three
streams,
genomes
are
common
M.
organellar
haplotype
is
fixed
in
guttatus,
but
new
events
rare.
Admixture
strongly
unidirectional,
each
stream
has
unique
distribution
ancestry
proportions.
one
stream,
distinct
cohorts
spatially
structured
at
~20-50m
resolution
stable
years.
Mating
system
provides
almost
complete
isolation
,
partial
barrier
between
cohorts.
Isolation
due
phenology
near-complete
nasutus.
Phenological
strong
some
years
cohorts,
much
weaker
other
years,
providing
potential
bridge
for
gene
flow.
These
fluctuations
associated
with
differences
water
availability
supporting
role
climate
mediating
strength
reproductive
isolation.
Together,
accurately
predict
assortative
which
estimate
directly
using
paired
maternal
genotypes.
Climate-driven
may
promote
longer-term
stability
complex
mosaic
hybrid
ancestry,
preventing
either
or
collapse
species
barriers.
Язык: Английский