Gene, Brain, and Behavior - UTokyo OpenCourseWareEstablishment of the concept of an ... •What is...
Transcript of Gene, Brain, and Behavior - UTokyo OpenCourseWareEstablishment of the concept of an ... •What is...
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Gene, Brain, and Behavior–Elucidating nondeterministic functions using deterministic techniques–
Yoshiki HottaDirector, Research Organization of Information and Systems
2004–current: Research Organization of Information and Systems
1998–2004: National Institute of Genetics
1972–1998: School of Science, The University of Tokyo
1967–1972: California Institute of Technology
1967: Graduate School of Medicine, The University of Tokyo
1963: Faculty of Medicine, The University of Tokyo
Global Focus of Knowledge, July 8, 2009
The University of Tokyo
‡: Copyright of a publication with this symbol belongs to a third party. Reproduction or secondary publications of
this copyrighted publication require direct permission of the use from the copyright holders.
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Natural historical descriptive discipline
↓ Genetics, DNA-nomy
Universal and unified understanding of life
↓ Genetic Engineering
Natural history of molecules: Genomics
↓ Life Informatics?
↓ Systems Biology?
?????????
Dialectical development of Life Science
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Revolutions in Life Science
The First Revolution
Early 20th century:
Rediscovery of Mendelian inheritance
Universal law applicable to all species
→ Drosophila genetics
→ Chromosome map
→ Biochemical genetics (one gene-one enzyme hypothesis)
→ Molecular genetics of phage and E. coli
Establishment of the concept of an
“experimental model of organism”
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http://en.wikipedia.org/wiki/File:Thomas_Hunt_Morgan.jpg
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Founder of drosophila genetics
Thomas Hunt Morgan (1917)
The Physical Basis of Heredity
“Complexity of life phenomena simply
looks complex because of our ignorance”
“Genesis phenomena are the
development of genes”
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The Second Revolution
1953 DNA double helix→ Molecular mechanisms of replication, transcription,
and translation
Universality of the genetic code
→ The end of molecular genetics??
1975–present
Cloning & gene transfer
(Genetics beyond the species barrier)→ Elucidation of brain, development, and genetic
diseases
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Determinism-focused research Genetics, Ethology
Strict and precise research
Mechanistic, Gene, Instinct
Indeterminism-focused research Embryology, Psychology
Enjoyable research that emphasizes the flexibility and variety of living organisms
Intercellular interactions, Leaning
Two approaches to research on life
Unified in the 1980s
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Methods of analysis of complex
phenomena that comprise Life
• Analyzing and understanding by breaking
down into constituent elementsMolecular biology, Biochemistry
Understanding the whole as a sum of each element
• Understanding the system as a wholeMendelian genetics, Darwin’s theory of evolution
Understanding the whole even if each elementary
process is not well known
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‡ “Molecular Genetics”, Haruo Ozeki and Mitsuru Takanami (Iwanami Koza Gendai Seibutsu Kagaku, Vol 2), Iwanami Shoten,1974-1975
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‡ “Molecular Genetics”, Haruo Ozeki and Mitsuru Takanami (Iwanami Koza Gendai Seibutsu Kagaku, Vol 2), Iwanami Shoten,1974-1975
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‡ http://ja.wikipedia.org/wiki/ファイル:Niobe050905-Siamese_Cat.jpeg
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Gene → Brain
(Determinism?) (Indeterminism?)
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Biologist’s (my) interests
• Are the central nervous circuits determined by genes?
• What is the relationship between instinctive behavior
and genes?
• Evolution of organisms and genes
• Development of organisms and genes
• What is the relationship between susceptibility to
disease and genetic information?
• Are the individual differences of side effects of drugs
related to the genome?
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Advantages of drosophila
From molecule to individual, to group
From differentiation to evolution
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Disadvantages of drosophila
Invertebrate
Not accepted as a research model
at medical schools
No similarity with humans!
(Is it true?)
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Origins of Life Origins of Life
Human Human FlyFly
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Gene → ? →・・・→ ? → BehaviorIntermediate stages are a black box
Genetics way of thinking
Mutation →・・・→ Behavioral abnormality
“Brain” should be able to be studied through
“behavioral mutation”
What elements are required to identify
behavioral mutants?
1. An experimental model system in which
experiments are easy to conduct
2. Easy and highly reliable techniques to observe
behavior
3. Highly dedicated, enthusiastic researchers
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Diffusion Attractive force
of phototaxis
Phototaxis Index
Scale to indicate phototaxis
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Kagaku (1975)vol.45 No.4 p215
‡
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‡ Kagaku (1975)vol.45 No.4 p215
Centrosome
Loci
No. of
obtained alleles
ERG signal
Cistron
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Research on non-phototactic mutation
The second stage
Where are the abnormalities? (location)
Eye? Brain? Motor nerve? Muscle?
What abnormalities are present? (characteristics)
Absence of specific cells?
No differentiation?
Death after differentiation?
Differentiated into different cells?
Vitamin A deficiency ….. ?
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‡ Hotta & Benzer, Nature, vol 240, 527-535, copyright (1972)
x
xx
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‡ “Development and Differentiation of Nervous System” (Modern Biology Series; 28) Yuzo Tsukada, Kyoritsu Shuppan, 1976
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‡ “Development and Differentiation of Nervous System” (Modern Biology Series; 28) Yuzo Tsukada, Kyoritsu Shuppan, 1976
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‡ “Developmental Pharmacology”, Ebashi Setsuro et al., Igaku Shoin, 1979
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‡ “Seitai no Kagaku”, October 1972, Vol.23, No.5, p232
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Copyrighted materials have been removed
“Behavior and Adaptation of Insects: Intersection of Genetics and Ecology”, Chozo Oshima
Publisher: Baifukan
Published in 1974
P119 Fig. 6-2C
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“Behavior and Adaptation of Insects: Intersection of Genetics and Ecology”, Chozo Oshima
Publisher: Baifukan
Published in 1974
P122-123 Fig. 6-4(1)&(2)
Copyrighted materials have been removed
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Copyrighted materials have been removed
“Behavior and Adaptation of Insects: Intersection of Genetics and Ecology”, Chozo Oshima
Publisher: Baifukan
Published in 1974
P117 Fig. 6-1
‡ Hotta & Benzer, Nature, vol 240, 527-535, copyright (1972)
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Presumptive fate map of Drosophila blastosphere
shoulder thorax elytron
head
proboscis
brainMesoderm/muscle
foregut
limb
gonad
abdominal segment
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‡ Chiba et al., Nature 374, 6518,166-168, (1995)
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‡ Chiba et al., Nature 374, 6518,166-168, (1995)
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‡ Chiba et al., Nature 374, 6518,166-168, (1995)
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‡ Chiba et al., Nature 374, 6518,166-168,(1995)
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The Third RevolutionEarly 21st century: Advent of genome era
→ Decoding the entire genome of organisms
→ Comparative genomics, evolution of life
→ Fundamental understanding of life
→ Social and medical applications
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Traditional common concepts of science
Precise description → Elimination of insignificant details
→ Abstraction(Creativity is in the way of Elimination and Abstraction!)
Formulating as a law
(A word is enough to the wise!)
Experiments designed to examine only a part of the system!
Unique feature of genomicsExamining the entire subject all together!
(Quantity and speed are the key!)
(Advancements in computer technology)
Is this a new scientific style?
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Challenges in life science research
Unified theory based on DNA
→ Natural history of molecules
Elements → Systems Network
Demands for new methodology(Mathematics, Information Science, Analysis techniques)
Trend: Basic Science → Application
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How far can we go with determinism?
The human brain is good at deterministic thinking
Determinism is used to understand
non-deterministic phenomena, too
(for example, advancements in physics)
Newtonian Mechanics → Quantum Mechanics
Non-deterministic properties of organisms are
determined by genes, too
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Genes determine the
non-deterministic scope, too
e.g. “Language”ability is inherent content is acquired
Genes code “Brain Language”
Non-
determinism
(environment)
Determinism
(gene)VS.
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References
Yoshiki Hotta and Kuniyoshi Sakai (2007)
“Gene, Brain, and Language” Fun of Science Café, Chuko Shinsho
A portion of my research references information from books by Takashi Tachibana
listed below (although they may be too technical).
Takashi Tachibana
“10 Billion Years of Travel (I. Exploring the brain by genes)”, p.11–26,
Asahi Shinbun (1998)
“Science Millennium (Elucidating the mystery of brain development by genes)”,
p.157–186, Chuo Koron Shinsha (1999)