NCBI filter out fields in entrez query with efetch

Question

[peteladrien]

I am currently getting informations on sequences using NCBI entrez API. The url looks like : https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=nuccore&id=JVEU01000013,HQ844023.1&rettype=gb&retmode=xml

and output looks like:

<?xml version="1.0" encoding="UTF-8"?>
<GBSet>
   <GBSeq>
      <GBSeq_locus>JVEU01000013</GBSeq_locus>
      <GBSeq_length>5266</GBSeq_length>
      <GBSeq_strandedness>double</GBSeq_strandedness>
      <GBSeq_moltype>DNA</GBSeq_moltype>
      <GBSeq_topology>linear</GBSeq_topology>
      <GBSeq_division>BCT</GBSeq_division>
      <GBSeq_update-date>10-JUL-2015</GBSeq_update-date>
      <GBSeq_create-date>10-JUL-2015</GBSeq_create-date>
      <GBSeq_definition>Stenotrophomonas maltophilia strain 498_SMAL 1015_5266_269573_11+,1127+,970+, whole genome shotgun sequence</GBSeq_definition>
      <GBSeq_primary-accession>JVEU01000013</GBSeq_primary-accession>
      <GBSeq_accession-version>JVEU01000013.1</GBSeq_accession-version>
      <GBSeq_other-seqids>
         <GBSeqid>gb|JVEU01000013.1|</GBSeqid>
         <GBSeqid>gnl|WGS:JVEU01|1015_5266_269573_11+,11&gt;</GBSeqid>
         <GBSeqid>gi|876108632</GBSeqid>
      </GBSeq_other-seqids>
      <GBSeq_project>PRJNA267549</GBSeq_project>
      <GBSeq_keywords>
         <GBKeyword>WGS</GBKeyword>
      </GBSeq_keywords>
      <GBSeq_source>Stenotrophomonas maltophilia</GBSeq_source>
      <GBSeq_organism>Stenotrophomonas maltophilia</GBSeq_organism>
      <GBSeq_taxonomy>Bacteria; Proteobacteria; Gammaproteobacteria; Xanthomonadales; Xanthomonadaceae; Stenotrophomonas; Stenotrophomonas maltophilia group</GBSeq_taxonomy>
      <GBSeq_references>
         <GBReference>
            <GBReference_authors>
               <GBAuthor>Roach,D.J.</GBAuthor>
            </GBReference_authors>
            <GBReference_title>A Year of Infection in the Intensive Care Unit: Prospective Whole Genome Sequencing of Bacterial Clinical Isolates Reveals Cryptic Transmissions and Novel Microbiota</GBReference_title>
            <GBReference_journal>PLoS Genet. 11 (7), E1005413 (2015)</GBReference_journal>
      </GBSeq_references>
      <GBSeq_comment>Source DNA available from Steve Salipante, University of Washington Department of Laboratory Medicine, Box 357110, 1959 NE Pacific Street, NW120 Seattle, WA 98195-7110; ##Genome-Assembly-Data-START## Assembly Method ABYSS v. 1.3.5 Genome Coverage 21x Sequencing Technology Illumina HiSeq ##Genome-Assembly-Data-END##</GBSeq_comment>
      <GBSeq_feature-table>
         <GBFeature>
            <GBFeature_key>source</GBFeature_key>
            <GBFeature_location>1..5266</GBFeature_location>
            <GBFeature_intervals>
               <GBInterval>
                  <GBInterval_from>1</GBInterval_from>
                  <GBInterval_to>5266</GBInterval_to>
                  <GBInterval_accession>JVEU01000013.1</GBInterval_accession>
               </GBInterval>
            </GBFeature_intervals>
            <GBFeature_quals>
               <GBQualifier>
         [...]
               </GBQualifier>
            </GBFeature_quals>
         </GBFeature>
      </GBSeq_feature-table>
      <GBSeq_sequence>g[...]catcccgaactcggaa</GBSeq_sequence>
      <GBSeq_xrefs>
         <GBXref>
      </GBSeq_xrefs>
   </GBSeq>
   <GBSeq>
      <GBSeq_locus>HQ844023</GBSeq_locus>
      <GBSeq_length>942</GBSeq_length>
      <GBSeq_strandedness>single</GBSeq_strandedness>
      <GBSeq_moltype>RNA</GBSeq_moltype>
      <GBSeq_topology>linear</GBSeq_topology>
      <GBSeq_division>VRL</GBSeq_division>
      <GBSeq_update-date>01-AUG-2011</GBSeq_update-date>
      <GBSeq_create-date>01-AUG-2011</GBSeq_create-date>
      <GBSeq_definition>Rotavirus A HC91xUK reassortant (UKg9KC-1) NSP3 protein gene, complete cds</GBSeq_definition>
      <GBSeq_primary-accession>HQ844023</GBSeq_primary-accession>
      <GBSeq_accession-version>HQ844023.1</GBSeq_accession-version>
      <GBSeq_other-seqids>
         <GBSeqid>gb|HQ844023.1|</GBSeqid>
         <GBSeqid>gi|341832806</GBSeqid>
      </GBSeq_other-seqids>
      <GBSeq_source>Rotavirus A HC91xUK reassortant (UKg9KC-1)</GBSeq_source>
      <GBSeq_organism>Rotavirus A HC91xUK reassortant (UKg9KC-1)</GBSeq_organism>
      <GBSeq_taxonomy>Viruses; dsRNA viruses; Reoviridae; Sedoreovirinae; Rotavirus; Rotavirus A</GBSeq_taxonomy>
      <GBSeq_references>
         <GBReference>
            <GBReference_reference>1</GBReference_reference>
            <GBReference_position>1..942</GBReference_position>
            <GBReference_authors>
               <GBAuthor>Rippinger,C.M.</GBAuthor>
            </GBReference_authors>
            <GBReference_title>Genome sequences of the NIH UK-bovine reassortant vaccine components</GBReference_title>
            <GBReference_journal>Unpublished</GBReference_journal>
         </GBReference>
         <GBReference>
         </GBReference>
      </GBSeq_references>
      <GBSeq_feature-table>
         <GBFeature>
            <GBFeature_key>source</GBFeature_key>
            <GBFeature_location>1..942</GBFeature_location>
            <GBFeature_intervals>
               <GBInterval>
               </GBInterval>
            </GBFeature_intervals>
            <GBFeature_quals>
               <GBQualifier>
             [...]
               </GBQualifier>
            </GBFeature_quals>
         </GBFeature>
         <GBFeature>
            <GBFeature_key>CDS</GBFeature_key>
         [...]
            </GBFeature_quals>
         </GBFeature>
      </GBSeq_feature-table>
      <GBSeq_sequence>atgct[...]tgaatag</GBSeq_sequence>
   </GBSeq>
</GBSet>

I would like to retrieve only GBSeq_accession-version, GBSeq_moltype, GBSeq_topology, GBSeq_organism and GBSeq_taxonomy, so the outpul would look like this:

<?xml version="1.0" encoding="UTF-8"?>
<GBSet>
   <GBSeq>
      <GBSeq_moltype>DNA</GBSeq_moltype>
      <GBSeq_topology>linear</GBSeq_topology>
      <GBSeq_accession-version>JVEU01000013.1</GBSeq_accession-version>
      <GBSeq_organism>Stenotrophomonas maltophilia</GBSeq_organism>
      <GBSeq_taxonomy>Bacteria; Proteobacteria; Gammaproteobacteria; Xanthomonadales; Xanthomonadaceae; Stenotrophomonas; Stenotrophomonas maltophilia group</GBSeq_taxonomy>
  </GBSeq>
  <GBSeq>
   [...]
  </GBSeq>
</GBSet>

Is there any way to specify the field we want to retrieve in the entrez query?

Answer 1

[Sej Modha]

You can extract all fields except taxonomy using following command in command-line e-utils.

esearch -db nucleotide -query JVEU01000013|esummary|xtract -pattern DocumentSummary  -element AccessionVersion,MolType,Topology,Organism

For taxonomy you can run a separate command

elink -target taxonomy -db nuccore -id "JVEU01000013"|efetch -format xml|xtract -pattern Taxon -first Lineage