The Origin of a Curved...
Transcript of The Origin of a Curved...
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The Origin of a Curved Beak
Marta Linde-Medina
New York Medical College
Embryo Physics course
March 28th 2012
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Embryology and morphology cannot proceed independently of
all reference to the general laws of matter, to the laws of
physics and of mechanics. This proposition would, perhaps,
seem indisputable to every natural philosopher; but, in
morphological schools, there are very few who are disposed
to adopt it with all its consequences (His 1888)
Cited by R. Gordon in the preface of the book
Mechanical Engineering Of The Cytoskeleton In Developmental Biology
Wilhelm His
(1831-1904)
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Bird beak
Paradigmatic Darwinian system
Wide diversity of forms
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A multi-primordium organ
Frontonasal mass (1)
Lateral nasal (2)
Maxillary (2)
Mandibular (2)
Upper
beak
(5)
Lower beak (2)
ln
Limbs Beak
Forelimb
bud
hindlimb
bud
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Beak skeleton
E9
E11
E10
E12
1 rod: Nasal cartilage
2 rods: Meckel’s cartilage
Cartilage
Membrane bones
Alizarin-Alcian blue staining
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nasal
premaxilla
maxillar
jugal
palatine
E12
Different bones arise from different buds
quadratojugal
Upper beak
Lower beak
Upper beak skeleton
Lateral nasal buds
Frontonasal mass
Maxillary buds
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Gene-centric model - 1
1. Different beaks are the result of different skeletons
2. Different skeletons are the result of different gene expression patterns
Basic idea
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BMP4, Calmodulin, TGFβRII, β-catenin and Dkk3
Candidate genes: different expression patterns in different finch species
Gain-of-function experiments
Inject retrovirus
Schneid
er
2006
E4 E11
Length measurements Cartilage/bone staining
Malla
rin
o e
t al 2011
Experiments in chicken embryos
Gene-centric model - 2
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BMP4
Calmodulin
TGFβRII, β-catenin and Dkk3
network
Cartilage
Bone
Two independent developmental modules
Gene-centric model - 3
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BMP4
Calmodulin
TGFβRII, β-catenin and Dkk3
Depth, width
Length
Depth, length
Beak dimension Expression
Gene-centric model - 4
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Conventional morphometrics
These hypothetical beaks have the same length and depth, but present
substantial shape differences. A conventional morphometric analysis do
not capture this shape variation.
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A curved beak is a form within the
plastic repertoire of the chicken embryo
Induced curved beaks at E13 by
the injection of different
teratogens (at E4): (a) 3-
acetylpyrimidine, (b) boric acid,
(c) DAPT, (d) sulphanilamide,
(e) valproic acid; (f) an
untreated specimen is showed
for allowing comparisons.
Pictures are at the same scale.
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Valproic acid (VPA)
2. Teratogen. It is an oxidant
agent that produces a
decrease in embryonic
growth and an increase in
neural tube defects by
increasing apoptotic levels
(Tung and Winn 2011). It
also alters cell proliferation
and cell differentiation.
1. Antiepileptic drug
Chate
auvie
ux e
t al. 2
010
1
2
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Systemic administration
E4
Valproic acid experiments
From E5 to E12
Geometric morphometric analysis
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Geometric morphometric analysis - 1
digital images xy coordinates of landmarks
raw data new xy dataset
scaling
translation
rotation
shape differences shape differences
+
arbitrary variation
Procrustes
analysis
1 2
3 4
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Geometric morphometric analysis - 2
all specimens consensus
pair comparisons
Fit data to thin-plane spline function
The parameters of this function
are the shape variables for
each specimen
5
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Geometric morphometric analysis - 3
W Conventional statistical tests
Principal Component Analysis (PCA)
Main shape patterns
MANOVA
Shape differences between control and treated embryos
6
Matrix of shape variables
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E5 Results -1
MANOVA table
1 5 9 13
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E6 Results - 2
MANOVA table
1
4 5
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E7 Results - 3
MANOVA table
1
4 5
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VPA-treated embryos have less
expanded buds, their tips are
more separated from each other,
and consequently, the oral gap is
larger
Interpretation
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E7 E8
E9 E10
inflection
CONTROL
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E11 E12
CONTROL
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No inflection
E7 E8
E9 E10
TREATED
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E11 E12
TREATED
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How could a reduction in bud
expansion have originated a
curved beak?
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LN LN
Mx Mx
FNM
Md Md
Different buds expand in different directions
Black arrows indicate the direction of expansion of cell
populations (McGonnell et al. 1998):
1. FNM and LN expand along a mediolateral axis (in the plane
of the screen, towards the lower corners)
2. Mx expand along a proximodistal axis (towards the viewer
out of the screen)
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Beak growth
The FNM grows forward when is lifted by the maxillary buds
fused
E5 E6
E7 E8
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E9 E9
control treated
A curved beak
An induced curved beak in the chicken is not due to the
alteration of the differentiation of skeletal tissue (cartilage or
bone). It is instead the consequence of a reduction of bud
expansion, so that the maxillary buds fail to lift the FNM
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Revisiting finches
Bpm4
cartilage
chondrogenic mesenchyme
E5 E6.5
FNM
Geospiza magnirostris
Abzhanov e
t al. 2
006
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Incipient forms already present at E5
G. fuliginosa G. fortis G. magnirostris G. scandens G. cornirostris G. difficilis
Malla
rino e
t al. 2
011
Cam
pàs e
t al. 2
011
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A prospective model based not on
developmental genes, but on the physics
their products mobilize during beak
morphogenesis (bud expansion and the
physical interactions between buds)
A physicalist developmental model
for the bird beak