Combining niche modeling & next- generation sequencing of DNA from museum specimens John McCormack...
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- Slide 1
- Combining niche modeling & next- generation sequencing of
DNA from museum specimens John McCormack Director/Curator, Moore
Laboratory of Zoology Assistant Professor, Biology Department
Occidental College
- Slide 2
- Misperception of natural history collections as antiquated and
Victorian
- Slide 3
- Goal of this talk: show how older museum collections can
leverage todays technology Dr. Edwards pointed out last week how
useful museum specimens are for exploring phylogeography and
species limits My goal is to show how research specimens provide
links to todays technologies and data sources Which allow a
holistic appraisal of an organisms phenotype, genotype, and
ecological niche
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- We have incredible new technologies and data sources Oxford
Nanopore MinIon 40 kB reads DNA sequencing Remote-sensing
satellites
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- Every vouchered specimen provides a unique opportunity to link
phenotype, genotype, and the ecological niche in the pursuit of
outstanding questions in evolutionary biology Mission
Statement
- Slide 6
- The Phenotype: observable characteristics Genes + Environment
http://www.nytimes.com/2013/02/05/science/pigeons-a-darwin-favorite-carry-new-clues-to-evolution.html
http://learning.blogs.nytimes.com/2013/02/06/darwins-pigeons-learning-about-evolution-from-bird-traits/
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- Phenotypes have always been studied, but we are discovering new
ways to unlock the data 3D CT scanning Multivariate statistics
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- Phylophenomics?
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- The Genotype: DNA from museum specimens Frozen tissue
collection at the American Museum of Natural History Fresh frozen
tissue Ancient DNA Moore Laboratory of Zoology
- Slide 10
- Traditional DNA sequencing with ancient DNA is laborious time
Three times the work for the same fragment! design internal primers
three PCRs, sequencing rxns High quality genomic DNA Somewhat
degraded DNA Badly degraded DNA Repeat this for each locus (Scott
showed why we prefer to have many loci)
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- New methods and technologies are especially well-suited to
ancient DNA Sequence capture, target enrichment, in-solution
hybridization Species1 ACTGA Species2 TGCAT Species3 CCCTC 24
hours
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- All fragments can be pooled and sequenced on a next-generation
sequencing machine 12-15 million reads per lane But what are these
mysterious probe sequences?
- Slide 13
- The difference in throughput is perhaps over 1,000,000x
Traditional Sanger sequencing Sequence capture with next-generation
sequencing
- Slide 14
- The Niche: Ecology from Space Georeferencing in real time by
GPS retrospectively w/ Google Earth, field notes, etc.
- Slide 15
- Remote-sensing satellites Weather Stations Temperature Rain
Seasonality Greenness Leaf Area Index Tree Cover Canopy Height The
Niche: Ecology from Space Museum specimens allow us to tap into
these data through the record of an individual of a species
occurring at a certain place and time on Earth
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- The Niche: Ecology from Space NASA and the Jet Propulsion Lab
are releasing new environmental data layers for every square
kilometer of Earth all the time Canopy Height
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- Testing for ecological differences among species Extract the
environmental data from all the occurrence points (where it does
live) As well as from many random points from the range of the
species to represent the suite of habitats that it could live in
Reduce the variation to a couple axes and visualize Niche model
Localities (dots) + enviro. layers + analysis (Maxent) = model of
where a species lives
- Slide 18
- species occurs Where species could occur (but doesnt for
whatever reason) Arteaga et al. 2011 Evolution McCormack et al.
2010 Evolution
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- Testing for ecological differences among species Visualizing
species and their backgrounds together Are niches different just
because of where they live? Or are they more similar/different than
you might guess based on where they live? McCormack et al. 2010
Evolution Remember: the primary data are drawn from museum
specimens (and other sources of georeference data)
- Slide 20
- Moore Laboratory of Zoology Founded in 1950 by Robert T. Moore,
private bird collector Over 60,000 skins (highest bird to student
ratio worldwide) Most specimens pre-date knowledge about DNA =
virtually no tissue collection Largest Mexican bird collection in
the world (larger than both big collection in Mexico City) Extinct
Imperial Woodpeckers
- Slide 21
- Is use of museum collections really declining? MLZ georeference
data first made available
- Slide 22
- Our research at the Moore Lab Every vouchered specimen provides
a unique opportunity to link phenotype, genotype, and the
ecological niche in the pursuit of outstanding questions in
evolutionary biology Mission Statement
- Slide 23
- Mexico is topographically complex What is the role of mountains
in species diversification? Describing the basic units of
biodiversity Our research focus
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- Madhvi Venkatraman Undergraduate Unicolored Jays Aphelocoma
unicolor
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- Whitney Tsai Laboratory Technician Wood-quail Dendrortyx
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- Fiona Gowen Masters Student Western Scrub-Jay Aphelocoma
californica
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- Field Work Collections Work Molecular Work
- Slide 28
- Why is it important to make a one-to-one link between phenotype
and genetics? Mexican Jay Aphelocoma wollweberi Transvolcanic Jay
Aphelocoma ultramarina In mitochondrial DNA, the two species are
divergent with no evidence for gene flow McCormack et al. Molecular
Ecology 2008
- Slide 29
- Why is it important to make a one-to-one link between phenotype
and genetics? Mexican Jay Aphelocoma wollweberi Transvolcanic Jay
Aphelocoma ultramarina In nuclear DNA, a cline of Transvolcanic
markers to the north suggested ancient gene flow Is ancient gene
flow detectable in the appearance of the individuals carrying the
markers? McCormack & Venkatraman submitted ms.
- Slide 30
- Why is it important to make a one-to-one link between phenotype
and genetics? Mexican Jay Aphelocoma wollweberi Transvolcanic Jay
Aphelocoma ultramarina McCormack & Venkatraman submitted
ms.
- Slide 31
- Why is it important to make a one-to-one link between phenotype
and genetics? Mexican Jay Aphelocoma wollweberi Transvolcanic Jay
Aphelocoma ultramarina We could conclude that ancient gene flow had
left no detectable trace in the mtDNA or appearance of Mexican
Jays! But only because we could make the one-to-one link between
genotype and phenotype. McCormack & Venkatraman submitted
ms.
- Slide 32
- Why is it important to make a one-to-one link between phenotype
and genetics? Mexican Jay Aphelocoma wollweberi Transvolcanic Jay
Aphelocoma ultramarina Also, the fact that Transvolcanic Jays were
recognized as different species was due to research linking
phenotypes and genotypes of museum specimens McCormack et al.
Molecular Ecology 2008 Genotype
- Slide 33
- Why is it important to make a one-to-one link between phenotype
and genetics? Mexican Jay Aphelocoma wollweberi Transvolcanic Jay
Aphelocoma ultramarina Also, the fact that Transvolcanic Jays were
recognized as different species was due to research linking
phenotypes and genotypes of museum specimens MJs TJs UJs McCormack
et al. Molecular Ecology 2008 Phenotype
- Slide 34
- Spearfishing vs. trawling for DNA Traditional Sanger sequencing
Sequence capture with next-generation sequencing
- Slide 35
- New methods and technologies are especially well-suited to
ancient DNA Sequence capture, target enrichment, in-solution
hybridization What are these mystery probes designed from? Somewhat
conserved so they work on a broad swath of species Not so conserved
that there is no variation to build phylogenies with
- Slide 36
- Ultraconserved elements (UCEs) as universal markers for
sequence capture phylogenomics and ancient DNA UCEs = stretches of
DNA that are remarkably conserved across highly divergent
species
- Slide 37
- Brant Faircloth UCLA UCEs found in mammals and birds Found over
5,000 UCE regions shared between birds and lizards.
- Slide 38
- Faircloth et al. 2012 Syst Biol And all amniotes!
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- Core UCE is conserved (anchor) & variation found in the
flanks Frequency variant bases Distance from core UCE Faircloth et
al. 2012 Syst Biol
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- All fragments can be pooled and sequenced on a next-generation
sequencing machine Illumina HiSeq or MiSeq
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- For very rapid divergences, randomness in gene histories needs
to be accounted for (Edwards Lecture)
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- Applications of UCEs Evolutionary origin of turtles
- Slide 48
- Sunbittern + tropicbirds? shorebird + hoatzin??? McCormack et
al. 2013 PLoS One Bird phylogeny from 1,500 loci
- Slide 49
- UCE sequence capture of ancient DNA from museum skins Would
revolutionize older museum collections that pre-date knowledge
about DNA (like the Moore Lab)
- Slide 50
- Unicolored Jays Aphelocoma unicolor Tissue Indiv1: 1147 UCE
loci Indiv2: 1347 Recent Toe Pad - 1990 Indiv1: 273 Indiv2: 323
Indiv3: 199 Indiv4: 563 Tissue Indiv1: 528 Indiv2: 612 Old Toe Pad
- 1940 as high as 151
- Slide 51
- Summary Exciting new technologies are available to mine genetic
and ecological information from museum specimens Sequence capture
using conserved probe sets are promising for ancient DNA from study
skins Ecological data from satellites allow for construction and
comparison of species niches These advances promise to make older
natural history collections increasingly relevant to modern
research