castanyes blaves

Random ramblings about some random stuff, and things; but more stuff than things -- all in a mesmerizing and kaleidoscopic soapbox-like flow of words.

5/11/2009

 

Anolis carolinensis: First reptile in Ensembl -- Amonida Sadissa

  • Very few anolis proteins and cDNAs, many more ESTs.
  • Used Uniprot PE Evidence ranking to generate transcript models with genewise
  • Different parameters for Exonerate, including exhaustive option for cDNAs, including 31000 chicken set (which wasn't very useful in the end)
  • Chris Ponting group provided extra models and kill list to rename some retrotransposons and pseudogenes
  • Manually looked at some of the EST genes in Chris' list to reincorporate them in the main db
Word of advise to all Genome Sequencing Centers out there: now that RNAseq is cheap and powerful, please allocate some of your budget for that instead of spending all in genomic sequencing. Contact Sanger people for PCR-free sample preparation protocols, which makes a huge difference in terms of avoiding duplicity.


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4/23/2009

 

Ensembl Quality Checking -- Michael Schuster

All Ensembl gene predictions for all vertebrate species are based on experimental evidence:

  1. UniprotKB/Swiss-Prot
  2. NCBI RefSeq proteins and mRNAs
  3. UniprotKB/TrEMBL
  4. EMBL Nucleotide Sequence Archive

Aligning the evidences back to the gene prediction with Exonerate. Types of alignment results:

  • perfect
  • added start
  • longer region
  • missing start
  • non-matching start
  • non-matching region
  • shorter region
  • ...

Exonerate has an exhaustive mode that takes a lot more time but fixes some of the mini-intron and
mini-exon issues that sometimes occur. Exonerate cdna2genome is very useful for quality checking.

Genebuild now uses head-to-head alignments of genewise and exonerate, and takes the best in each case.

Some cases are still difficult to get right with algorithmic solutions: this is were the curators are needed.

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