Ambient temperature regulated flowering time
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1 Ambient temperature regulated flowering time Applications of RNAseq RNA- seq course: The power of RNA-seq June 7 th, 2013; Richard Immink
2 Overview Introduction: Biological research question/hypothesis Experimental set-up and preparations Data analysis Data confirmation Data interpretation: Back to the biological research question
3 Flowering time: When to flower?
4 Environmental factors influencing flowering time Floral integrator genes
5 Effects of ambient temperature fluctuations 23 C 27 C Floral integrator genes
6 The ambient temperature pathway For the majority of Regulators no temperature-dependent differential expression!? Balasubramanian et al, PLoS Genetics, 2006
7 Hypothesis Alternative splicing (AS) is a key mechanism in ambient temperature regulation of flowering time What is the genome-wide effect of temperature fluctuations on expression and splicing?
8 Experimental set-up: How to detect and quantify AS events? AS characteristics: - Events can be rear - Differences can be limited (few nt only) Plant species related questions: - Genome sequence available? - Arrays available?
9 Tiling array or RNA-seq?
10 Correlation of expression levels
11 Exon Boundary detection
12 RNA-seq!... But, which method? Seq length (nt) Read quality Throughput fixed Illumina Hiseq 50/ Gb/flowcell fixed SOLiD Gb/flowcell range 454/Roche av~ Mb range Ion Torrent av~ Mb/chip Pac Bio range +/ /run ~3,5 kb
13 Illumina Hiseq Further considerations: cdna - Sample multiplexing? How many? - 50 nt or 100 nt run? - Paired-end or Single read?
14 RNAseq to search for temperature affected alternative splicing (AS) 23 C 16 C 23 C 27 C Paired-end 100nt Illumina Hiseq runs in duplo, bp length fragments, (multiplexing of 4 samples/lane) Comparison of transcriptome of ºC control vs º switch and vs 23-16º C switch (after 24 hrs!) Identify genes that are differentially alternatively spliced (and/or differentially expressed).
15 Sample preparation (Elio Schijlen) Delivery of 2-10 μg total RNA
16 Data analysis (Edouard Severing) Mapping to the genome Transcriptome assembly, quantification of events, identification of differentially regulated events
17 Mapping to the genome: Tophat 2.0 Splice junction Settings: Insert size: (~220; sd ~20; between two adapters) No discordant alignments Alignments have fulfill the expectations given the insert size and map orientation Alignments have to be paired (no mix mode) Reads aligned to unique regions of the genome are considered Min max intron size:
18 Identification of differential expression/splicing: Cufflinks Settings: Only use of uniquely mapped reads Existing annotation is provided to Cufflinks Min max intron size:
19 Results: reproducibility (duplo)
20 Results Total amount of differentially alternatively spliced genes 23 C 27 C: 1107 genes 23 C 16 C: 897 genes Reciprocal: 135 genes (15%) Differentially alternatively spliced flowering genes 23 C 27 C: 17 genes 23 C 16 C: 15 genes Overlap: 7 genes Reciprocal: 4 genes (including FLM) Relative expression cold Control heat Reciprocal
21 RNA-seq results: FLM alternative splicing (mutually exclusive exon) FLMβ FLMδ 23 C 27 C 23 C 16 C
22 RNAseq results: FLM alternative splicing (mutually exclusive exon) FLMβ FLMδ 16 C 23 C 27 C
23 Alternative splicing in MAF3 (alternative 3 splice site)
24 Alternative splicing in MAF3 (alternative 3 splice site C C
25 Problem I: Strange events! At5G65050 = MAF2 At5G65060 = MAF3 MAF2 MAF3 MAF2 and MAF3 joined as single gene
26 Solution Divide genes in variable and constitutive blocks (excluding terminal regions). For each variable region we group the isoforms based on their local composition V-region 1 3-groups V-region 2 2-groups
27 Problem II: Mixed reads
28 Data confirmation: qrt-pcr - Primer design! - Blast primers against RNA-seq data! - Note: Analyse based on isoform ratio s and not absolute values! (semi-quantitative) (in case to complex: amplify start till end clone mix of isoforms sequence individual clones
29 Data interpretation: back to our hypothesis Alternative splicing (AS) is a key mechanism in ambient temperature regulation of flowering time
30 The FLM case FLMβ FLMδ 16 C 27 C - Both FLMβ and FLMδ are predicted not to be targetted by NMD - Both FLMβ and FLMδ transcripts are translated (hence a protein is produced)
31 Functional analysis FLM isoforms Flowering time FLMβ = repressor of flowering FLMδ = activator of flowering Col0 35S::FLMβ 35S::FLMδ David Posé and Markus Schmid, submitted
32 Conclusion: the ambient temperature dependent flowering time control can be explained by FLM AS!
33 Acknowledgements PRI-Bioscience-PDS Leonie Verhage Gerco Angenent MPI Tuebingen David Posé Markus Schmid WUR-Bioinformatics Edouard Severing Elio Schijlen Horizon Breakthrough
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