Probes can be designed in an evolutionary hierarchy
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1
2 Probes can be designed in an evolutionary hierarchy
3 Probes can be designed to be highly redundant to increase the certainly of identification
4 The match between clone counts and hybridization intensity
5 Genomics terminology Shotgun cloning: undirected cloning effort where the entire sample is cloned and sequenced Contig - assembled continuous sequence derived from sequence reads from a single clone Scaffold: assembled sequence reads derived from multiple overlapping clones nx coverage: mean number of times a region was sequenced from independent clones Mini-scaffold: scaffold assembled only by paired ends of overlapping contigs (approx. 1X coverage)
6 Environmental Genomics Ed Delong Shotgun cloning of Megabase fragments from marine environments Probe for those with rrna gene of interest Sequence and use bioinformatics to infer function Used to connect diverse psba (photosystem II) genes to known 16S sequence groups
7 Shotgun cloning and assembly of enviromental genomes Tyson et al 2004, Nature 428:37-43 Venter et al 2004, Science 304:66-74.
8 Tyson et al Iron Mt. study Pink biofilm growing at ph 0.87, which was known to be composed of 6 rrna types 103,462 sequence reads from shotgun clones provided 10X coverage for two species (Leptospirillum III and Ferroplasma II), and 3X coverage for Leptospirillum II. Very low polymorphism in Leptospirillum III interpreted as evidence for a single strain Higher polymorphism (2.2%) in Ferroplasma II interpreted as evidence for 3 strains which show evidence of past recombination A single nitrogen fixer was found (Leptospirillum III
9 An aside about rrna 16S rrna sequences of Fer I isolate and assembled Fer II strains differ by less than 1%. The assembled genomes of Fer I and FerII differ by more than 22% even though gene order and content appear to be conserved.
10 Tyson et al. FISH image of biofilm Yellow (red + green) Leptospirillum Green (Eubacterial) Blue (Archaea) predominantly Ferroplasma
11
12 Some numbers from the Venter et al. study From 200L of filtered sea water, 1.66 million sequence reads were derived. 246 mbp were assembled into 64,398 scaffolds ranging from 826 bp to 2.6 Mbp 170 mbp of miniscaffolds and unpaired reads 1.2 million protein-coding genes (10X more than previously in protein database) 69,901 conserved open reading frames with no assignable function 60,000 16S sequences, 148 of which are at least 3% different from previously known sequence
13 Summary of genes found in the Sargasso sea survey
14 Assembly problems Most abundant genomes are overrepresented Assembled genomes are composites of different individuals (particularly genomes with lower coverage)
15 Estimates of species diversity At least 300 species/sample assuming homologous sequences that are greater than >6% are from different species Using models based on a poisson distribution and 3 different coverage models, estimates of species for the whole study range from 1800 to 47,000. A minimum of 12X greater sequence effort would be needed to sample 95% of the unique sequence
16 Population level findings Scaffolds with 14X coverage contain about 1 SNP/10,000 bases, and also contain inserted phage sequences SAR 11- like (a previously characterize 16S type) sequences are abundant but are very polymorphic
17 Venter et al evidence the the composite genome represents a population
18 Other interesting findings Species distributions are patchy even in the ocean (e.g. Burkholderia and Sewanella abunance in sample 1 but not 2) Clear copy bias in rrna gene sequences in favor of beta and gamma proteobacteria, which typically have two or more gene copies Huge diversity of rhodopsin sequences, possible nonchlorophyll light harvesting?
19 Estimates of abundance of major groups based on different gene families
20 Rhodopsin tree showing the novelty of the Sargasso sea samples (SAR)
21 Advantages and disadvantages of environmental genomics Avoids PCR and all the inherent biases Not dependent on rrna Lots of new genes and new information about who has them Currently way too expensive for mere mortals Not very efficient if structure and activity are the main questions
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23 Hybridization to rrna for identification and quantification Extract total RNA from sample (no amplification or cloning!) Spot it on a filter Probe it with oligonucliotide probes
24
25 From MacKay et al. 2002
26 From MacKay et al. 2002
27 Landeweert et al 2003 Wanted to measure competition between two mycorrhizal fungi: Suillus & Paxillus Setup pot inoculations with pine trees and either fungus or both fungi together Measured: total mycelium, PLFAs Amplified ITS region with basidiomycete specific primers Compared via DGGE, clone counts, real-time PCR quantification
28 Mycelium (white) of Suillus in coculture with pine
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30 DGGE gel of amplified basidiomycete ITS from soil
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32 Conclusions DGGE, Clone counts, and real-time quantification agree that Suillus ITS increases as Paxillus decreases What have we gained by real-time? Quantification of the template, rather than the amplicons
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