Experimental Verification Department of Genetic Medicine Alexandre Reymond Department of Genetic Medicine
Gene predictions outside of VEGA RT-PCR all pairs of exons predicted outside of VEGA objects Goal: Confirm experimentally new gene models Question(s): How good are the predictions outside of the mainstream? Is there any coding gene out there?
Gene predictions outside of VEGA RT-PCR all pairs of exons predicted outside of VEGA objects in 13 of the 44 ENCODE regions Oligos are designed with Primer 3 and default parameters Individually on 24 human polyA RNA
Gene predictions outside of VEGA 1255 pairs of exons predicted by nine different programs outside of VEGA objects (13 ENCODE regions)
Gene predictions outside of VEGA Tested 1215 pairs for a total of 29160 reactions 2.6% of success rate (32/1215) 1.9% with perfectly predicted exon boundaries (23/1215) 0.7% with displaced exon boundaries (9/1215)
Gene predictions outside of VEGA RT-PCR all pairs of exons predicted outside of VEGA objects Goal: Confirm experimentally new gene models Question(s): How good are the predictions outside of the mainstream? Is there any coding gene out there?
RT-PCR VEGA objects RT-PCR of all the VEGA objects belonging to the « novel transcripts », the « putative transcripts» and the « non-canonical splicing » class. Goal: Confirm experimentally new genes Question: Is the VEGA annotation team doing a good job?
5’ RACE 5’ RACE of all the VEGA objects belonging to the « known » and the « novel protein» class Goal: Find new 5’ end exons and/or new 5’ UTRs due to alternative splicing Question: Should a 5’RACE effort be pursued for the entire genome (ENCODE consolidation phase)?
5’ RACE DNA mRNA Primers are designed with “Primer 3” just 3’ of the ATG in an exon common to most (all) described transcripts of this gene Parameters (25 nts, 68°<Tm<72°, best 70°, 50-70% GC) cDNA is prepared with “BD SMART RACE” kit Touchdown 72°, 70° and 68°
5’ RACE results 5’RACE in 12 tissues on 426 genes Pick tissue with a single large bands 52% success rate (220/426) Pick a second tissue with a single large band Add 6% and get to 58% rate success (245/426) Clone and sequence band from tissues with multiple hits Add 5-15%...