Étienne danchin
TRANSCRIPT
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Étienne DanchinCNRS, Toulouse, France.
http://edanchin.fr/
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What does the existence of cultural
Inheritance change in the process of
Evolution?
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What does the existence of cultural
Inheritance change in the process of
Evolution?
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What does the existence of cultural
Inheritance change in the process of
Evolution?
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Heredity:
Patterns of parent-offspring resemblance
Inheritance:
Underlying mechanisms: transfer of any kind of
information across generations
Genetic: DNA sequence (‘Sequencic’)
Non-genetic inheritance: Inheritance of
phenotypic variation not resulting from DNA
sequence variation
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Heredity:
Patterns of parent-offspring resemblance
Central role in natural selection,
Inheritance:
Underlying mechanisms: transfer of any kind of
information across generations
Genetic: DNA sequence (‘Sequencic’)
Non-genetic inheritance: Inheritance of
variation not resulting from DNA sequence
variation
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Darwin “The Origin of species” (1859, p.12 ):
“Any variation which is not inherited
is unimportant for us”
Implying that only the variation that is inherited is
important for natural selection
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Trait variance (VP)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*According
to Darwin
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet. and
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Trait variance (VP)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*According
to Darwin
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
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Trait variance (VP)
Genetic variance
(VG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*
According to the
current
mainstream
Semantic shift
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
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Trait variance (VP)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*According to
the current
mainstream
Semantic shift
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
Genetic variance
(VG)
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Genetic variance
(VG)
Trait variance (VP)
*
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*According to
the current
mainstream
Semantic shift
VP = VG + VE + …
Non-genetic transmitted Variance
(VTNG)
VE
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
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Trait variance (VP)
* Non-genetic transmitted Variance
(VTNG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*VE
According to
the current
mainstream
Semantic shift
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
VP = VG + VE + …
Genetic variance
(VG)
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Trait variance (VP)
* Non-genetic transmitted Variance
(VTNG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*VE
According to
the current
mainstream
Semantic shift
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
VP = VG + VE + …
Discarding part of the baby with the bathwater
Genetic variance
(VG)
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Trait variance (VP)
* Non-genetic transmitted Variance
(VTNG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
Genetic variance
(VG)
Inclusive
heredity
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Trait variance (VP)
* Non-genetic transmitted Variance
(VTNG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*
Non-genetic inheritance
VTEpi VPNGEVTEcoVTSoc
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
… …
Genetic variance
(VG)
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Trait variance (VP)
* Non-genetic transmitted Variance
(VTNG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*Genetic variance
(VG)
Francis et al. Science, 1999Anway et al. Science, 2005
Jablonka & Lamb 2005, Evolution in four dimensionsDanchin et al. Science, 2004
Danchin & Wagner Oikos 2010 Danchin et al. 2011. Nature Rev. Genet.
Wang et al. 2017 Biol. Reviewsand many references therein
……
For the
existence
of VTNG
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Trait variance (VP)
* Non-genetic transmitted Variance
(VTNG)
Transmitted
variance (VT)
Non-transmitted
Variance (VNT)*
Non-genetic inheritance
VTEpi VPNGEVTEcoVTSoc
Danchin et al. Science, 2004; Danchin and Wagner Oikos 2010; Danchin et al. 2011. Nature Rev. Genet.
… …Culture
Genetic variance
(VG)
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After Darwin, Weismann(1889) separated germ plasm (≈genotype) vs soma (≈phenotype)
=> Wilson (1896), and then Maynard Smith (1965) produced this diagram of inheritance ruling out the inheritance of acquired characters
DNA
Phenotype
DNA
Phenotype
DNA
Phenotype
T
i
m
e
Germline S o m a
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DNA
DNA
Phenotype
Phenotype
DNA
Phenotype
Environment
Environment
Environment
T
i
m
e
Germline S o m a
Danchin et al. 2019, Biological Reviews
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DNA
DNA
Phenotype
Phenotype
DNA
Phenotype
Environment
Environment
Environment
The canonical vision of inheritance according to the Modern Synthesis
T
i
m
e
Germline S o m a
Danchin et al. 2019, Biological Reviews
Red arrow: Informational channel
across generations
Only one red arrow
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DNA
DNA
Phenotype
Phenotype
DNA
Phenotype
Environment
Environment
Environment
The canonical vision of inheritance according to the Modern Synthesis
T
i
m
e
Germline S o m a
Danchin et al. 2019, Biological Reviews
Simplification: other transmission processes,
one of which being
Cultural Transmission
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DNA
DNA
Phenotype
Phenotype
DNA
Phenotype
Environment
Environment
Environment
T
i
m
e
Danchin et al. 2019, Biological Reviews
Cu
ltu
re
Cultural heredity
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Generation n
Generation n+1
Genetics
Vertical
Culture
Vertical
Horizontal
Oblique
May drastically affect evolution
99.9
%
Epigenetics,ecological,
parental,…Originality
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DNA
DNA
Phenotype
Phenotype
DNA
Phenotype
Environment
Environment
Environment
T
i
m
e
Danchin et al. 2019, Biological Reviews
Cu
ltu
re
Originality of Cultural heredityOne Lineage
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T
i
m
e
Danchin et al. 2019, Biological Reviews
Cu
ltu
re
Originality of Cultural heredity
Cu
ltu
re
=>
Culture can spread across lineages
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What does the existence of cultural
Inheritance change in the process of
Evolution?
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Classical definition: “The process by which
the frequencies of genes change over
generations”
Today, two major processesEvolution through natural selection
Occurs as soon as 3 conditions are fulfilled (a) ∃ variation among individuals on a trait (ie phenotypic variation, VP)
(b) ∃ a consistent relationship between trait value & fitness (capacity
to avoid predators, acquire mates,...) = Selective pressure
Trait value
Fitn
ess
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Classical definition: “The process by which
the frequencies of genes change over
generations”
Today, two major processesEvolution through natural selection
Occurs as soon as 3 conditions are fulfilled (a) ∃ variation among individuals on a trait (ie phenotypic variation, VP)
(b) ∃ a consistent relationship between trait value & fitness (capacity
to avoid predators, acquire mates,...) = Selective pressure
(c) Trait variation should be transmitted (i.e. heritable)
Parent-Offspring resemblance
Evolution through drift
Same condition except that condition (b) is replaced by random selection
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Must meet the 3 conditions of evolution by natural
selection
Variation, Change, Innovation
Selective pressure
Cultural variants are Inclusively heritable
(through social learning)
Parent-offspring resemblance
=> Social learning can lead to cultural evolution only if
variants (or their descendants) persist across
generations (traditions)
May evolve (ie be modified) within 1 generation
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Must meet the 3 conditions of evolution by natural
selection
Variation, Change, innovation
Selective pressure
Cultural variants are Inclusively heritable
(through social learning)
Parent-offspring resemblance
Only cultural variants persisting (accumulating) over generations can produce cultural evolution
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Must meet the 3 conditions of evolution by natural
selectionVariation, Change, InnovationSelective pressureCultural variants are Inclusively heritable
(through social learning)Parent-offspring resemblance
Only cultural variants persisting (accumulating) over generations can produce cultural evolution
Inclusive definition of evolution:
“Processes by which frequencies of variantschange over generations" Bentley et al. (2004)
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Classical definition: “The process by which
the frequencies of genes change over
generations”
Today, two major processesEvolution through natural selection
Occurs as soon as 3 conditions are fulfilled (a) ∃ variation among individuals on a trait (ie phenotypic variation, VP)
(b) ∃ a consistent relationship between trait value & fitness (capacity
to avoid predators, acquire mates,...) = Selective pressure
(c) Trait variation should be transmitted (i.e. heritable)
Parent-Offspring resemblance
Evolution through drift
Same condition except that condition (b) is replaced by random selection
The importance
of variation
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Pre
se
nt
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Variation in information from many generations ago (genetics)
Variation in experience since fertilization (phenotypic plasticity)
This is current the vision of
inheritance according to the
Modern Synthesis of Evolution
VP = VG + VE + ….
VE
VG
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Variation in information from many generations ago (genetics)
Variation in experience since fertilization (phenotypic plasticity)
?
VP
Danchin et al. 2019. Phil Transac Roy Soc
Environmental information gathered by
recent ancestors far more up-to-date
and thus a far better predictor of the
environment
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Variation in information from many generations ago (genetics)
Variation in experience since fertilization (phenotypic plasticity)
Accruing evidence for the inheritance of
recent environmental effects
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Variation in information from many generations ago (genetics)
Variation in experience since fertilization (phenotypic plasticity)
Animal Culture
Develop-
ment
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Variation in information from many generations ago (genetics)
Variation in experience since fertilization (phenotypic plasticity)
Inherited response to
environmentalstress
Parental effects
Animal Culture
Develop-
ment
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Development
VG
VTNG
VNT
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Ph
en
oty
pe
Fertilization
Development
VG
VTNG
VNT
VP
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Fertilization
Neo-Darwinism Neo-Lamarckism
D a r w i n i s m
Development
Variation in information from many generations ago (genetics)
Variation in experience since fertilization (phenotypic plasticity)
Also variation in the history of more recent ancestors
(nongenetic inheritance)
Ph
en
oty
pe
VG
VTNG
VNT
VP
DNA sequence:
Genetic inheritance
Irreversible
Danchin et al. 2019. Phil Transac Roy Soc
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Log10 of number of generations04 3 2 16 57
Fertilization
Neo-Darwinism Neo-Lamarckism
D a r w i n i s m
Development
Ph
en
oty
pe
VG
VTNG
VNT
VP
DNA sequence:
Genetic inheritance
Irreversible
Danchin et al. 2019. Phil Transac Roy Soc
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DNA
Phenotype
Environment
DNA
Phenotype
Environment
DNA
Phenotype
Environment
T
i
m
eInheritance according to the Modern Synthesis of Evolution
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DNA
DNA
Phenotype
Phenotype
DNA
Phenotype
Environment
Environment
Environment
T
i
m
e
Danchin et al. 2019, Biological Reviews
Cu
ltu
re
Cultural heredity
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DNA
Phenotype
Environment
DNAEnvironment
DNA
Phenotype
Environment
Phenotype
Epigenes
Epigenes
Epigenes
Heredity according to the Inclusive Evolutionary Synthesis
T
i
m
e
Danchin et al. 2019, Biological Reviews
Modeling informational
dynamics
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DNA
Phenotype
Environment
DNA
Phenotype
Environment
DNA
Phenotype
Environment
T
i
m
eInheritance according to the Modern Synthesis of Evolution
Modeling informational
dynamics
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Ongoing conceptual leap
Need to multidimensionalize
inheritance to implement the
“Inclusive Evolutionary
Synthesis”
Modernising (generalizing) the
Modern Synthesis of Evolution
One major dimension being animal culture
(originalities)
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What does the existence of cultural Inheritance change in the process of
Evolution?
Now, we just start to be able to answer
that question
Now: the tools and concepts
But this is just a beginning
There is no empirical study of the consequences
of culture in evolution per se, yet
Entirely open field
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Acknowledgements
Home national
institutions
Local
institutions
Funding
Agencies
Our labs
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Darwin. 1859. On the origin of species by means of natural selection. London: John Murray.
Danchin et al. 2004. Public information: from nosy neighbors to cultural evolution. Science.
Danchin & Wagner. 2010. Inclusive heritability: combining genetic and nongenetic information to study animal behavior and culture. Oikos.
Bentley et al. 2004. Random drift and culture change. Proc Roy Soc B.
Danchin et al. 2011. Beyond DNA: integrating inclusive inheritance into an extended theory of evolution. Nature Rev Genet.
Francis et al. 1999. Nongenomictransmission across generations of maternal behavior and stress responses in the rat. Science.
Anway et al. 2005. Epigenetic transgenerational actions of endocrine disruptors and mate fertility. Science.
Jablonka & Lamb. J. 2005. Evolution in four
dimensions. Genetic, Epigenetic, Behavioural,
and Symbolic Variation in the history of life.
Cambridge Massachusetts: MIT.
Wang et al. 2017. Lamarck rises from his
grave: parental environment-induced
epigenetic inheritance in model organisms and
humans. Biol Rev.
Weismann. 1893. The Germ Plasm: a Theory
of Heredity. C. Scribner's sons.
Wilson, EB. 1896. The cell in development and
inheritance. London: Macmillan.
Maynard Smith. 1965. The theory of evolution.
Middlesex: Penguin.
Danchin et al. 2019. Epigenetically-Facilitated
mutational assimilation: Epigenetics as a hub
within the Inclusive Evolutionary Synthesis.
Biol Rev.
Danchin et al. 2019. Early in life effects and
heredity: reconciling neo-Darwinism with neo-
Lamarckism under the banner of the inclusive
evolutionary synthesis. Phil. Transac Roy Soc
B-Biol Sci.
Plus references therein
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