[maker-devel] AED score

Wed Dec 5 13:31:26 MST 2012

Your output has no genes.  They've all been filtered out.  The gene
predictions are left for reference purposes, but there are no gene models
in the file.  You need to look at the type columns in the GFF3 file -->
match/match_part features are evidence and reference data but not models.
All models will have types gene/mRNA/exon/CDS.  For example if you just
want gene models in your file you can use the gff3_merge script with the
-g option, and it will only print out the gene models.

I think you may be misinterpreting what is happening at different steps,
as well as how to read the result files.  Could you give me a detailed
explanation of what you expect to get back together with your control
files and I can walk you through the configuration, and indicate what to
expect.  Also what was the report like from CEGMA. Could you include the
report file that shows how complete your genome is and how fragmented it
is?  

Thanks,
Carson

On 12-12-05 3:03 PM, "Parul Kudtarkar" <parulk at caltech.edu> wrote:

>Dear Carson,
>
>Thanks for a quick response. keep_preds is set to 0
>Though for previous step(ab-intio gene predictions keep_preds was set to
>1, see Scaffold1_input.gff). I have also attached the output file
>Scaffold1_out.gff.
>Please advice.
>
>Thanks and regards,
>Parul Kudtarkar
>
>> You should always get all predictions, but should only get models
>> (match/match_part) with AED scores less than 0.5.  You should never get
>> models (gene/mRNA/CDS) with an AED score of 1.00 unless you have
>> keep_preds set.
>>
>> Do you have keeps_preds set or gene models with AED values above your
>> threshold (not match/match_part features)?  If the first one is the
>>case,
>> just set it to 0.  If the second one in the case, could you send me
>> example GFF3?
>>
>> Thanks,
>> Carson
>>
>>
>>
>> On 12-12-04 7:27 PM, "Parul Kudtarkar" <parulk at caltech.edu> wrote:
>>
>>>Dear Carson,
>>>
>>>Thanks once again, we have limited experimental data with very short
>>> ESTs.
>>>CEGMA is useful for us to gauge our gene-model.
>>>On a different note to re-annotate genome(post evidence based
>>>prediction(used as training dataset)and abinitio gene-prediction). Here
>>>are the control parameters I am using with AED score set to 0.5, however
>>> I
>>>get predictions that includes the ones with AED score of 1.00 in
>>> resulting
>>>gff3 file. Though I do see the number of genes reduced to 1/3 of initial
>>>gff3 file.
>>>
>>>#-----Genome (Required for De-Novo Annotation)
>>>genome=Scaffold1.fa #genome sequence file in fasta format
>>>organism_type=eukaryotic #eukaryotic or prokaryotic. Default is
>>> eukaryotic
>>>
>>>#-----Re-annotation Using MAKER Derived GFF3
>>>genome_gff= Scaffold1.gff #re-annotate genome based on this gff3 file
>>>est_pass=1 #use ests in genome_gff: 1 = yes, 0 = no
>>>altest_pass=0 #use alternate organism ests in genome_gff: 1 = yes, 0 =
>>>no
>>>protein_pass=1 #use proteins in genome_gff: 1 = yes, 0 = no
>>>rm_pass=0 #use repeats in genome_gff: 1 = yes, 0 = no
>>>model_pass=1 #use gene models in genome_gff: 1 = yes, 0 = no
>>>pred_pass=1 #use ab-initio predictions in genome_gff: 1 = yes, 0 = no
>>>other_pass=0 #passthrough everything else in genome_gff: 1 = yes, 0 = no
>>>
>>>#-----MAKER Behavior Options
>>>AED_threshold=0.5 #Maximum Annotation Edit Distance allowed (bound by 0
>>>and 1)
>>>
>>>Thanks and regards,
>>>Parul Kudtarkar
>>>
>>>> Wow 330,000 is a lot. a large portion of genes are likely to be
>>>>partial
>>>>at
>>>> best.  You should seriously consider using mRNAseq to capture those by
>>>> using maker's est_gff option to pass in results from cufflinks or
>>>>trinity.
>>>>  Also I wouldn't even try to annotate contigs less than 10kb in size,
>>>>just
>>>> have maker skip them by setting the min_contig filter in the
>>>> maker_opts.ctl file.
>>>>
>>>> Thanks,
>>>> Carson
>>>>
>>>>
>>>>
>>>>
>>>> On 12-11-29 7:31 PM, "Parul Kudtarkar" <parulk at caltech.edu> wrote:
>>>>
>>>>>Thanks for the guidance Carson, total contig size is 330,611 with N50
>>>>> of
>>>>>39.17kb. I agree we have short ESTs. So this is the possible reason
>>>>> when
>>>>>filtering based on AED score 0.75 there are no gene models predicted
>>>>>despite the model_gff file has few genes with scores less than 0.75?
>>>>>
>>>>>Thanks and regards,
>>>>>Parul Kudtarkar
>>>>>
>>>>>> There are certain characteristics that are apparent in this contig.
>>>>>First
>>>>>> it seems to be repeat rich with a very low gene density.  You also
>>>>>>have
>>>>>very short ESTs, and because of the lengths you are probably getting
>>>>>many
>>>>>> of them to align spuriously which produces very short gene models
>>>>>> that
>>>>>are
>>>>>> more than likely false positives or at the very least just a piece
>>>>>>of
>>>>>>a
>>>>>gene.  I would turn off est2genome as a predictor for this reason
>>>>> unless
>>>>>you can get longer EST assemblies (i.e. From mRNAseq).    Your protein
>>>>>alignments also seem to be few and far between.  You probably need to
>>>>>add
>>>>>> more proteins from a couple of related species, and you might
>>>>>> consider
>>>>>using protein2genome rather than est2genome as a predictor if you are
>>>>>still working to generate a training set. Also est2genome produced
>>>>>models
>>>>>> almost always have an AED score near 0 so mixing est2genome with the
>>>>>AED_threshold with such limited protein support does create an
>>>>>artificial
>>>>>> bias to get back very short and incomplete models.
>>>>>>
>>>>>> How many contigs do you have in total and what is the N50 value for
>>>>>>the
>>>>>assembly? If you have a large number of very short contigs, you will
>>>>> get
>>>>>very inflated gene counts because you get genes split across contigs
>>>>> and
>>>>>many contigs tend t be subtle rearrangements of other contigs just
>>>>>assembled in a slightly different way (so you can get bits and pieces
>>>>> of
>>>>>the same genes just rearranged).  This scenario is another confounding
>>>>>factor if using the est2genome predictor with short ESTs.  I would
>>>>>recommend running CEGMA to get an estimate for the genome completeness
>>>>>as
>>>>>> well as get an estimate of fragmentation as one of the statistics
>>>>>produced
>>>>>> is a percent of genes that are found complete (end to end) vs those
>>>>>> that
>>>>>are partial.  CEGMA identifies house keeping genes that tend to be
>>>>>shorter
>>>>>> and less intron rich than other genes in the genome, so if CEGMA
>>>>>> gives
>>>>>> a
>>>>>high partial percentage and a low complete percentage, then this
>>>>> pattern
>>>>>can be expected to be even more exaggerated for other genes in the
>>>>>genome.
>>>>>>
>>>>>> If your genome is highly fragmented or proteins do not align well
>>>>>> then
>>>>>there are other strategies.  For example, some vertebrate genomes end
>>>>> up
>>>>>having extremely fragmented assemblies (on the order of 100,000
>>>>>contigs),
>>>>>> and if they are distantly related to other annotated species few
>>>>>proteins
>>>>>> may align to the contigs because the introns in the alignments tend
>>>>>> to
>>>>>be
>>>>>> so long and exons so short that it pushes down the significance
>>>>>> scores
>>>>>too
>>>>>> much.  In those cases heavy mRNAseq seems to be the best if not only
>>>>>> way
>>>>>to get enough evidence to stitch gene models together.
>>>>>>
>>>>>> Thanks,
>>>>>> Carson
>>>>>>
>>>>>>
>>>>>>
>>>>>> On 12-11-28 4:40 PM, "Parul Kudtarkar" <parulk at caltech.edu> wrote:
>>>>>>
>>>>>>>Dear Carson and Daniel,
>>>>>>>Thanks. I ran sample file for filtering genes based on AED score.
>>>>>>>The
>>>>>input gff3 file was provided to option model_pred(see attached file
>>>>>Scaffold1.gff), the cutoff AED score was set to 0.75. There are at
>>>>> least
>>>>>>> 5
>>>>>>>genes with AED score less than 0.75. However there were no genes
>>>>>>> predicted
>>>>>>>in the output file(see attached file Scaffold1_out). I have also
>>>>>attached
>>>>>>>the maker_opts.ctl. Could you please advice on this.
>>>>>>>Thanks and regards,
>>>>>>>Parul Kudtarkar
>>>>>>>> Use the AED_threshold option in the maker_opts.ctl file if you
>>>>>>>>just
>>>>>>>>want
>>>>>>>> to restrict final gene models to close matches directly within
>>>>>>>>maker.
>>>>>>>>On
>>>>>>>> the other hand, if you are trying to build a dataset for training
>>>>>>>> gene
>>>>>predictors, use the maker2zff script for generating a filtered dataset
>>>>>>>>for
>>>>>>>> SNAP training.  There are a number of filters available. Just call
>>>>>>>> the
>>>>>script once without parameters to see the options.
>>>>>>>> Thanks,
>>>>>>>> Carson
>>>>>>>> On 12-11-27 5:55 PM, "Daniel Ence" <dence at genetics.utah.edu>
>>>>>>>>wrote:
>>>>>>>>>Hi Parul,
>>>>>>>>>I think the way you described (with the maker_opts.ctl file) is
>>>>>>>>>how
>>>>>you
>>>>>>>>>want to proceed. You still need to give the genome too.
>>>>>>>>>Daniel
>>>>>>>>>Daniel Ence
>>>>>>>>>Graduate Student
>>>>>>>>>Eccles Institute of Human Genetics
>>>>>>>>>University of Utah
>>>>>>>>>15 North 2030 East, Room 2100
>>>>>>>>>Salt Lake City, UT 84112-5330
>>>>>>>>>________________________________________
>>>>>>>>>From: maker-devel-bounces at yandell-lab.org
>>>>>>>>>[maker-devel-bounces at yandell-lab.org] on behalf of Parul Kudtarkar
>>>>>[parulk at caltech.edu]
>>>>>>>>>Sent: Tuesday, November 27, 2012 3:41 PM
>>>>>>>>>To: Parul Kudtarkar
>>>>>>>>>Cc: maker-devel at yandell-lab.org
>>>>>>>>>Subject: Re: [maker-devel] AED score
>>>>>>>>>Also, are there any other parameters that are required when
>>>>>>>>>filtering
>>>>>based on AED score?
>>>>>>>>>> Hello Carson,
>>>>>>>>>> Just to confirm, Is there a script that would filter gene models
>>>>>>>>>>at
>>>>>specific AED score.
>>>>>>>>>> Alternatively if I were to do this within maker with regards to
>>>>>>>>>>parameters
>>>>>>>>>> in maker_opts.ctl file I would have to provide my predicted
>>>>>>>>>>genes
>>>>>>>>>>gff3
>>>>>>>>>> file to model_gff and  set AED_threshold at desired threshold?
>>>>>Thanks and regards,
>>>>>>>>>> Parul Kudtarkar
>>>>>>>>>>> AED score with 1 are the ones you don't want.  0 is best and 1
>>>>>>>>>>> is
>>>>>worst
>>>>>>>>>>> as
>>>>>>>>>>> it is a distance metric.  You can use the AED_threshold
>>>>>>>>>>> parameter
>>>>>to
>>>>>>>>>>> require better matching to the evidence by setting it closer to
>>>>>>>>>>>0.
>>>>>>>>>>>You
>>>>>>>>>>> can
>>>>>>>>>>> also try to increase protein homology evidence as some of your
>>>>>calls
>>>>>>>>>>>may
>>>>>>>>>>> be split genes due to lack of evidence linking them.
>>>>>>>>>>> --Carson
>>>>>>>>>>> On 12-11-26 4:35 PM, "Parul Kudtarkar" <parulk at caltech.edu>
>>>>>>>>>>>wrote:
>>>>>>>>>>>>Dear Maker community,
>>>>>>>>>>>>For gene-prediction I get training data-set from evidence based
>>>>>prediction, I use this data-set to train SNAP as well as Augustus
>>>>>predictions, followed by boot-strapping. I would typically expect
>>>>>20-30K
>>>>>>>>>>>>genes however I am getting 8 times the expected gene count
>>>>>>>>>>>> indicating
>>>>>>>>>>>> too
>>>>>>>>>>>>many false positives. Is there a way to further refine these
>>>>>predication/script to retain predictions with AED score 1 and if
>>>>>yes
>>>>>>>>>>>>how
>>>>>>>>>>>>to go about this?
>>>>>>>>>>>>Thanks and regards,
>>>>>>>>>>>>Parul Kudtarkar
>>>>>>>>>>>>--
>>>>>>>>>>>>Scientific Programmer
>>>>>>>>>>>>Center for Computational Regulatory Genomics
>>>>>>>>>>>>Beckman Institute,
>>>>>>>>>>>>California Institute of Technology
>>>>>>>>>>>>http://www.spbase.org
>>>>>>>>>>>>_______________________________________________
>>>>>>>>>>>>maker-devel mailing list
>>>>>>>>>>>>maker-devel at box290.bluehost.com
>>>>>>>>>>>>http://box290.bluehost.com/mailman/listinfo/maker-devel_yandell
>>>>>>>>>>>>-l
>>>>>>>>>>>>ab
>>>>>>>>>>>>.o
>>>>>rg
>>>>>>>>>> --
>>>>>>>>>> Scientific Programmer
>>>>>>>>>> Center for Computational Regulatory Genomics
>>>>>>>>>> Beckman Institute,
>>>>>>>>>> California Institute of Technology
>>>>>>>>>> http://www.spbase.org
>>>>>>>>>--
>>>>>>>>>Scientific Programmer
>>>>>>>>>Center for Computational Regulatory Genomics
>>>>>>>>>Beckman Institute,
>>>>>>>>>California Institute of Technology
>>>>>>>>>http://www.spbase.org
>>>>>>>>>_______________________________________________
>>>>>>>>>maker-devel mailing list
>>>>>>>>>maker-devel at box290.bluehost.com
>>>>>>>>>http://box290.bluehost.com/mailman/listinfo/maker-devel_yandell-la
>>>>>>>>>b.
>>>>>>>>>or
>>>>>>>>>g
>>>>>_______________________________________________
>>>>>>>>>maker-devel mailing list
>>>>>>>>>maker-devel at box290.bluehost.com
>>>>>>>>>http://box290.bluehost.com/mailman/listinfo/maker-devel_yandell-la
>>>>>>>>>b.
>>>>>>>>>or
>>>>>>>>>g
>>>>>>>> _______________________________________________
>>>>>>>> maker-devel mailing list
>>>>>>>> maker-devel at box290.bluehost.com
>>>>>>>>
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>>>>>>>>.o
>>>>>>>>rg
>>>>>>>--
>>>>>>>Scientific Programmer
>>>>>>>Center for Computational Regulatory Genomics
>>>>>>>Beckman Institute,
>>>>>>>California Institute of Technology
>>>>>>>http://www.spbase.org
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>--
>>>>>Scientific Programmer
>>>>>Center for Computational Regulatory Genomics
>>>>>Beckman Institute,
>>>>>California Institute of Technology
>>>>>http://www.spbase.org
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>--
>>>Scientific Programmer
>>>Center for Computational Regulatory Genomics
>>>Beckman Institute,
>>>California Institute of Technology
>>>http://www.spbase.org
>>>
>>
>>
>>
>
>
>--
>Scientific Programmer
>Center for Computational Regulatory Genomics
>Beckman Institute,
>California Institute of Technology
>http://www.spbase.org