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Transcript of Http://cs273a.stanford.edu [Bejerano Fall11/12] 1 Thank you for the midterm feedback! Projects will...
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Thank you for the midterm feedback!
Projects will be assigned this weekend.
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Lecture 12
Mid Term Feedback Feedback
Cis-Regulation
Cellular Signaling
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MidTerm Feedback Feedback
•You like us!–You like your teachers and love your TAs
•We like you too ;)
•We also like recruiting (at all levels) from this class–Talk to us if you’re interested
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Big Picture Reminder
We are surveying the functional classes of elements encoded by the human genome.
We have previously discussed:•Repetitive sequences (mobile elements & low complexity)
•Protein coding genes (and pseudogenes)
•Non coding RNAs (structural, micro, long, anti-sense etc.)
Today we’ll cover the last (known :) large class of functional elements, concluding the functional tour.
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Gene Regulation
•gene (how to)•control region(when & where)
DNA
DNA binding
proteins
RNA geneProtein coding
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unicellular
multicellular
Unicellular vs. Multicellular
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Broad View of Transcription
Chromatin / Proteins
DNA / Proteins
Extracellular signals
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Vertebrate Transcription Regulation
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Pol II Transcription
Key components:• Proteins• DNA sequence• DNA epigenetics
Protein components:• General Transcription factors• Activators• Co-activators
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Activators & Co-Activators
Protein - DNA
Protein - Protein
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The Core Promoter
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Chromatin Remodeling
“off”
“on”
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Nucleosome tail modifications
•Lysine acetylations.•Histone Acetyl-Transferases (HAT) & Histone Deacetylases (HDAC).
•Lysine and Argenine Metylations.–Modified by histone-
metyl-transferase.
•Phosphorilation.•Ubiquitination.
–H2A ubiquitination affects 10-15% of this histone in most eukaryotic cells
•ADP-ribosylation .
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CpG islands
Functionally:Unmethylated
Evolutionary:CpGs are rareoutside “CpG islands”
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Transcription Factor (TF) Binding Sites
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TFs in the Human Genome
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Synergy / non-linear additivity
Gene
DNA
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Combinatorial Regulatory Code
Gene
2,000 different proteins can bind specific DNA sequences.
A regulatory region encodes 3-10 such protein binding sites.
When all are bound by proteins the regulatory region turns “on”,and the nearby gene is activated to produce protein.
Proteins
DNA
DNA
Protein binding site
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Distal Transcription Regulatory Elements
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Enhancers
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Basal factors RNAP II
Enhancer with bound protein
promoter
Enhancers: action over very large distances
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Transient Transgenic Enhancer Assay
Reporter GeneMinimal PromoterConservedElement
Construct is injected into 1 cell embryos
Taken out at embryonic day 10.5-14.5
Assayed for reporter gene activity
in situ
transgenic
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Vertebrate Enhancer Combinatorics
Sall1limbneuraltube brain
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Vertebrate Enhancer Combinatorics
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What are Enhancers?
What do enhancers encode?
Surely a cluster of TF binding sites.
[but TFBS prediction is hard, fraught with false positives]
What else? DNA Structure related properties?
So how do we recognize enhancers?
Sequence conservation across multiple species
[weak but generic]
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Most Non-Coding Elements likely work in cis…
9Mb
“IRX1 is a member of the Iroquois homeobox gene family.
Members of this family appear to play multiple roles
during pattern formation of vertebrate embryos.”
gene deserts
regulatory jungles
Every orange tick mark is roughly 100-1,000bp long, each evolves under purifying selection, and does not code for protein.
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Many non-coding elements tested are cis-regulatory
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Vertebrate Gene Regulation
gene (how to)
control region(when & where)
DNA
proximal: in 103 letters
distal: in 106 letters
DNA binding
proteins
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Gene Expression Domains: Independent
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Repressors / Silencers
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What are Enhancers?
What do enhancers encode?
Surely a cluster of TF binding sites.
[but TFBS prediction is hard, fraught with false positives]
What else? DNA Structure related properties?
So how do we recognize enhancers?
Sequence conservation across multiple species
[weak but generic]
Verifying repressors is trickier [loss vs. gain of function].
How do you predict an enhancer from a repressor? Duh...
repressors
repressorsRepressors
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Insulators
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Cis-Regulatory Components
Low level (“atoms”):• Promoter motifs (TATA box, etc)• Transcription factor binding sites (TFBS)
Mid Level:• Promoter• Enhancers• Repressors/silencers• Insulators/boundary elements• Cis-regulatory modules (CRM)• Locus control regions (LCR)
High Level:• Epigenetic domains / signatures• Gene expression domains• Gene regulatory networks (GRN)
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Disease Implications: Genes
genome
gene
protein
Limb Malformation
Over 300 genes already
implicated in limb malformations.
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Disease Implications: Cis-Reg
genome
gene
NO protein
made
Limb Malformation
Growing number of cases (limb, deafness, etc).
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Transcription Regulation & Human Disease
[Wang et al, 2000]
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Critical regulatory sequences
Lettice et al. HMG 2003 12: 1725-35
Single base changes
Knock out
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Other Positional Effects
[de Kok et al, 1996]
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Genomewide Association Studies point to non-coding DNA
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WGA Disease
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9p21 Cis effects
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Follow up study:
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Cis-Regulatory Evolution: E.g., obile Elements
[Yass is a small town in New South Wales, Australia.]
Gene
Gene
What settings make these“co-option” events happen?
Gene
Gene
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Britten & Davidson Hypothesis: Repeat to Rewire!
[Britten & Davidson, 1971]
[Davidson & Erwin, 2006]
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Modular: Most Likely to Evolve?
Chimp Human
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Human Accelerated Regions• Human-specific substitutions in conserved
sequences
46[Pollard, K. et al., Nature, 2006] [Prabhakar, S. et al., Science, 2008][Beniaminov, A. et al., RNA, 2008]
Human Chimp
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Signal Transduction
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Cell Communication
Lodish, 20-1
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Wnt and Hedgehog signaling
Jacob & Lum Science 2007
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Signaling Pathways Important in Developmental Biology
• Wnt/Frizzled through -catenin
• Hedgehog
• TGF- family through Smads
• Growth factors via JAK-STATs
• Notch
• Integrin
• TNF
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Giant State Machine…
Chromatin / Proteins
DNA / Proteins
Extracellular signals