Experimentally testing mate preference in an avian system with unidirectional bill color introgression
Ecology and Evolution,
Journal Year:
2023,
Volume and Issue:
13(2)
Published: Feb. 1, 2023
Mating
behavior
can
play
a
key
role
in
speciation
by
inhibiting
or
facilitating
gene
flow
between
closely
related
taxa.
Hybrid
zones
facilitate
direct
examination
of
mating
and
the
traits
involved
establishing
species
barriers.
The
long-tailed
finch
(
Language: Английский
Spread of yellow-bill-color alleles favored by selection in the long-tailed finch hybrid system
Current Biology,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 1, 2024
Language: Английский
Diversifying selection and adaptive introgression of carotenoid-processing genes underlie the evolution of bill color in the long-tailed finch
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2024,
Volume and Issue:
unknown
Published: June 18, 2024
Abstract
Carotenoid
pigmentation
produces
the
yellow
and
red
coloration
of
birds
other
vertebrates,
but
our
understanding
genetic
architecture
carotenoid
ornamentation
is
largely
limited
to
studies
novel
color
variants
observed
in
captively
bred
populations.
The
complexity
carotenoid-based
evolution
nature
remains
poorly
characterized.
Here,
we
examine
long-tailed
finch
Poephila
acuticauda
,
an
Australian
songbird
with
two
hybridizing
subspecies
that
differ
bill
coloration:
western
eastern
hecki
.
We
characterize
composition
each
find
bills
can
be
explained
by
loss
C(4)-oxidation,
thus
blocking
dietary
pigments
from
being
metabolized
red.
Combining
linked-read
genomic
sequencing
reflectance
spectrophotometry
measurements
collected
wild-sampled
finches
laboratory
crosses,
identify
four
loci
together
explain
53%
variance
this
trait.
largest
effect
contain
genes
CYP2J19
essential
enzyme
for
ketolation
via
C(4)-oxidation
carotenoids,
TTC39B
enhancer
ketocarotenoid
production.
Evolutionary
genealogy
reconstruction
indicates
red-billed
phenotype
ancestral
alleles
at
both
arose
fixed
approximately
100
kya.
Yellow
then
introgressed
into
less
than
5
Across
all
loci,
derived
show
evidence
selective
sweeps,
implying
has
been
favored
natural
selection.
Our
study
suggests
frequent
adaptive
evolutionary
transitions
between
have
a
simple
basis.
Significance
studied
variation
color:
one
identified
single
metabolic
process,
underlying
distinct
these
colors.
Genetic
association
mapping
revealed
major
most
trait,
including
oxidative
gene
are
derived,
ancient
(~100
kya),
under
positive
This
driven
their
recent
(<5
kya)
introgression
across
hybrid
zone.
These
findings
important
implications
role
selection
phenotypic
systems.
Language: Английский
Adaptive Introgression of Carotenoid Processing Genes that Underlie Bill Color Variation in the Long-Tailed Finch
Published: Jan. 1, 2024
Language: Английский
Genomic islands of speciation harbor genes underlying coloration differences in a pair of Neotropical seedeaters
bioRxiv (Cold Spring Harbor Laboratory),
Journal Year:
2023,
Volume and Issue:
unknown
Published: Nov. 15, 2023
Abstract
Incomplete
speciation
can
be
leveraged
to
associate
phenotypes
with
genotypes,
thus
providing
insights
into
the
traits
relevant
reproductive
isolation
of
diverging
taxa.
We
investigate
genetic
underpinnings
phenotypic
differences
between
Sporophila
plumbea
and
S.
beltoni
.
has
only
recently
been
described
based,
most
notably,
on
in
bill
coloration
(yellow
vs.
black
).
Both
species
are
indistinguishable
through
mtDNA
or
reduced-representation
genomic
data,
even
whole-genome
sequencing
revealed
low
differentiation.
Demographic
reconstructions
attribute
this
homogeneity
gene
flow,
despite
divergence
order
millions
generations.
found
a
narrow
hybrid
zone
southern
Brazil
where
genetically,
yet
not
phenotypically,
admixed
individuals
appear
prevalent.
Despite
overall
differentiation,
we
identified
three
peaks
along
genome
highly
differentiated
SNPs.
These
regions
harbor
six
genes,
one
which
is
involved
pigmentation
(
EDN3
)
candidate
for
controlling
color.
Within
outlier
signatures
resistance
as
expected
islands
speciation.
Our
study
shows
how
genes
related
likely
generating
prezygotic
establishing
boundaries
early
Language: Английский