Pyrus Unigene v4

Analysis NamePyrus Unigene v4
SourceGenbank Prunus pyrus ESTs (Jan 1, 2008)
Date performed2008-01-01

Many sequencing projects around the world are depositing ESTs from Pyrus in the NCBI dbEST database. The Pyrus ESTs included in this assembly were downloaded on January 1, 2008. Not all of these ESTs are of high quality. To filter, we crossmatched the public sequences against NCBI's UniVec database and used the BLAST sequence similarity algorithm to remove species-specific chloroplast, mitochondrial, tRNA, and rRNA sequences.

To reduce redundancy and create longer transcripts we assembled these ESTs using the CAP3 1 program. For some sequences, we were able to obtain the original trace files and incorporate the phred quality values for each base into the assembly.

The final assembly has been annotated by BLAST sequence similarity searching 2 against Swiss-Prot 3and TrEMBL 3. We will also provide homology information for TAIR 4's Arabidopsis proteins, Poplar and Vitis proteins in the near future.

For more information on this project please contact the GDR development team.


January 1st, 2008 : Genbank Rosaceae ESTs Assembled

 Processing Summary
 Number of ESTs available  341
 Number of ESTs available after filtering  335
 Average Length  421
 Number of Contigs(CAP3 Assembly, -p 90 )  35
 Average Length of Contigs  596
 Number of Singlets  240
 Number of Putative Unigenes  275



  1. Huan, X. and Madan, A. (1999). CAP3: A DNA sequence assembly program. Genome Research, 9, 868-877.
  2. Altschul SF, Gish W, Miller W, Myers EW, Lipman DJ. (1990) Basic local alignment search tool. J Mol Biol. 215(3):403-10.
  3. Boeckmann B., Bairoch A., Apweiler R., Blatter M.-C., Estreicher A., Gasteiger E., Martin M.J., Michoud K., O'Donovan C., Phan I., Pilbout S., and Sneider M. (2003) The SWISS-PROT protein knowledgebase and its supplement TrEMBL in 2003. Nucleic Acids Research. 31:365-370.
  4. Rhee SY, Beavis W, Berardini TZ, Chen G, Dixon D, Doyle A, Garcia-Hernandez M, Huala E, Lander G, Montoya M, Miller N, Mueller LA, Mundodi S, Reiser L, Tacklind J, Weems DC, Wu Y, Xu I, Yoo D, Yoon J, Zhang P. (2003) The Arabidopsis Information Resource (TAIR): a model organism database providing a centralized, curated gate way to Arabidopsis biology, research materials and community. Nucleic Acids Res.. 31(1):224-8.


Library Information
The Pyrus ESTs used for this assembly were downloaded on January 1st, 2008


 EST Libraries
 Number of ESTs available  341
 # of Species  3
 # of Libraries  5
 # of Tissues  4
 # of Development Stages  2


View detailed chart of libraries.

 Pyrus communis  244
 Pyrus communis x Pyrus ussuriensis  82
 Pyrus pyrifolia  15



Homology was determined using the BLASTx algorithm for the Pyrus Contigs and Singlets vs. the Swiss-Prot and TrEMBL databases. Only matches with an E-value of 1.0 e-6 or better were recorded. Swiss-Prot is a curated protein database with a high level of annotation and a minimal level of redundancy, and TrEMBL is a computer-annotated supplement of Swiss-Prot that contains all the translations of TrEMBL nucleotide sequence entries not yet integrated in Swiss-Prot.

 Homology of Pyrus Contigs
 Number of Contigs  35
 Number (%) of Contigs with a Match in Swiss-Prot Database
 Download Excel Spreadsheet
 18 (51.4%)
 Number (%) of Contigs with a Match in TrEMBL Database
  Download Excel Spreadsheet
 27 (77.1%)


 Homology of Pyrus Singlets
 Number of Singlets  240
 Number (%) of Singlets with a Match in Swiss-Prot Database
  Download Excel Spreadsheet
 136 (56.7%)
 Number (%) of Singlets with a Match in TrEMBL Database
  Download Excel Spreadsheet
 165 (68.8%)


Microsatellite Analysis

The type and frequency of simple sequence repeats in this unigene assembly (V4) were determined using the program.For these searches, SSRs are defined as dinucleotides repeated at least 5 times, trinucleotides repeated at least 4 times, tetranucleotides repeated at least 3 times, or pentanucleotides repeated at least 3 times.

 Sequence information
 Number of Sequences  335
 Number of Sequences Having One Or More SSRs  28
 Percentage of Sequences Having One Or More SSRs  8.4%
 Total Number of SSRs Found  28
 Number of Motifs  17


Frequency of Motif Type

 Motif Length  Frequency  Percentage Frequency
 2bp  17  60.7%
 3bp  6  21.4%
 4bp  3  10.7%
 5bp  2  7.1%


Contact Details
 Name  Main, Dorrie
 Lab  Department of Horticulture
 Organization  Washington State University
 Address  45 Johnson Hall, Pullman, WA 99164
 Telephone  509-335-2774
 Fax  509-335-8690



No publications are currently available.

Contig GO Terms

The GO Terms ( were determined by comparing the contigs against Swiss-Prot using BLAST. The Sprot2GO annotation file was then used to map go terms to the sequences using relevant matches (1e-9).

ESNP Summary

The type and frequency of single nucleotide polymorphisms in this unigene assembly (V4) were determined using the AutoSNP software package (Savage et al., 2005).

View autoSNP output:

 SNP Summary
 Number of Contigs  35
 Number of SNPs  1
 Consensus Size  20870 bp
 SNP Frequency  0.00/100 bp
 Total Transistions  1
 Total Transversions  0
 Total Indels  0