1 package jalview.ext.ensembl;
3 import jalview.analysis.AlignmentUtils;
4 import jalview.datamodel.Alignment;
5 import jalview.datamodel.AlignmentI;
6 import jalview.datamodel.DBRefEntry;
7 import jalview.datamodel.DBRefSource;
8 import jalview.datamodel.Mapping;
9 import jalview.datamodel.SequenceFeature;
10 import jalview.datamodel.SequenceI;
11 import jalview.exceptions.JalviewException;
12 import jalview.io.FastaFile;
13 import jalview.io.FileParse;
14 import jalview.io.gff.SequenceOntologyFactory;
15 import jalview.io.gff.SequenceOntologyI;
16 import jalview.schemes.ResidueProperties;
17 import jalview.util.DBRefUtils;
18 import jalview.util.MapList;
19 import jalview.util.MappingUtils;
20 import jalview.util.StringUtils;
22 import java.io.IOException;
23 import java.net.MalformedURLException;
25 import java.util.ArrayList;
26 import java.util.Arrays;
27 import java.util.Collections;
28 import java.util.Comparator;
29 import java.util.LinkedHashMap;
30 import java.util.List;
31 import java.util.Map.Entry;
34 * Base class for Ensembl sequence fetchers
38 public abstract class EnsemblSeqProxy extends EnsemblRestClient
40 private static final List<String> CROSS_REFERENCES = Arrays
41 .asList(new String[] { "CCDS", "Uniprot/SWISSPROT" });
43 protected static final String CONSEQUENCE_TYPE = "consequence_type";
45 protected static final String PARENT = "Parent";
47 protected static final String ID = "ID";
49 protected static final String NAME = "Name";
52 * enum for 'type' parameter to the /sequence REST service
54 public enum EnsemblSeqType
57 * type=genomic to fetch full dna including introns
62 * type=cdna to fetch dna including UTRs
67 * type=cds to fetch coding dna excluding UTRs
72 * type=protein to fetch peptide product sequence
77 * the value of the 'type' parameter to fetch this version of
82 EnsemblSeqType(String t)
87 public String getType()
95 * A comparator to sort ranges into ascending start position order
97 private class RangeSorter implements Comparator<int[]>
101 RangeSorter(boolean forward)
107 public int compare(int[] o1, int[] o2)
109 return (forwards ? 1 : -1) * Integer.compare(o1[0], o2[0]);
117 public EnsemblSeqProxy()
122 * Makes the sequence queries to Ensembl's REST service and returns an
123 * alignment consisting of the returned sequences.
126 public AlignmentI getSequenceRecords(String query) throws Exception
128 // TODO use a String... query vararg instead?
130 // danger: accession separator used as a regex here, a string elsewhere
131 // in this case it is ok (it is just a space), but (e.g.) '\' would not be
132 List<String> allIds = Arrays.asList(query
133 .split(getAccessionSeparator()));
134 AlignmentI alignment = null;
138 * execute queries, if necessary in batches of the
139 * maximum allowed number of ids
141 int maxQueryCount = getMaximumQueryCount();
142 for (int v = 0, vSize = allIds.size(); v < vSize; v += maxQueryCount)
144 int p = Math.min(vSize, v + maxQueryCount);
145 List<String> ids = allIds.subList(v, p);
148 alignment = fetchSequences(ids, alignment);
149 } catch (Throwable r)
152 String msg = "Aborting ID retrieval after " + v
153 + " chunks. Unexpected problem (" + r.getLocalizedMessage()
155 System.err.println(msg);
160 if (alignment == null)
166 * fetch and transfer genomic sequence features,
167 * fetch protein product and add as cross-reference
169 for (String accId : allIds)
171 addFeaturesAndProduct(accId, alignment);
174 for (SequenceI seq : alignment.getSequences())
176 getCrossReferences(seq);
183 * Fetches Ensembl features using the /overlap REST endpoint, and adds them to
184 * the sequence in the alignment. Also fetches the protein product, maps it
185 * from the CDS features of the sequence, and saves it as a cross-reference of
191 protected void addFeaturesAndProduct(String accId, AlignmentI alignment)
193 if (alignment == null)
201 * get 'dummy' genomic sequence with exon, cds and variation features
203 SequenceI genomicSequence = null;
204 EnsemblFeatures gffFetcher = new EnsemblFeatures();
205 EnsemblFeatureType[] features = getFeaturesToFetch();
206 AlignmentI geneFeatures = gffFetcher.getSequenceRecords(accId,
208 if (geneFeatures.getHeight() > 0)
210 genomicSequence = geneFeatures.getSequenceAt(0);
212 if (genomicSequence != null)
215 * transfer features to the query sequence
217 SequenceI querySeq = alignment.findName(accId);
218 if (transferFeatures(accId, genomicSequence, querySeq))
222 * fetch and map protein product, and add it as a cross-reference
223 * of the retrieved sequence
225 addProteinProduct(querySeq);
228 } catch (IOException e)
230 System.err.println("Error transferring Ensembl features: "
236 * Returns those sequence feature types to fetch from Ensembl. We may want
237 * features either because they are of interest to the user, or as means to
238 * identify the locations of the sequence on the genomic sequence (CDS
239 * features identify CDS, exon features identify cDNA etc).
243 protected abstract EnsemblFeatureType[] getFeaturesToFetch();
246 * Fetches and maps the protein product, and adds it as a cross-reference of
247 * the retrieved sequence
249 protected void addProteinProduct(SequenceI querySeq)
251 String accId = querySeq.getName();
254 AlignmentI protein = new EnsemblProtein().getSequenceRecords(accId);
255 if (protein == null || protein.getHeight() == 0)
257 System.out.println("Failed to retrieve protein for " + accId);
260 SequenceI proteinSeq = protein.getSequenceAt(0);
263 * need dataset sequences (to be the subject of mappings)
265 proteinSeq.createDatasetSequence();
266 querySeq.createDatasetSequence();
268 MapList mapList = mapCdsToProtein(querySeq, proteinSeq);
271 // clunky: ensure Uniprot xref if we have one is on mapped sequence
272 SequenceI ds = proteinSeq.getDatasetSequence();
273 ds.setSourceDBRef(proteinSeq.getSourceDBRef());
274 Mapping map = new Mapping(ds, mapList);
275 DBRefEntry dbr = new DBRefEntry(getDbSource(), getDbVersion(),
277 querySeq.getDatasetSequence().addDBRef(dbr);
280 * compute peptide variants from dna variants and add as
281 * sequence features on the protein sequence ta-da
283 computeProteinFeatures(querySeq, proteinSeq, mapList);
285 } catch (Exception e)
288 .println(String.format("Error retrieving protein for %s: %s",
289 accId, e.getMessage()));
294 * Get database xrefs from Ensembl, and attach them to the sequence
298 protected void getCrossReferences(SequenceI seq)
300 while (seq.getDatasetSequence() != null)
302 seq = seq.getDatasetSequence();
305 EnsemblXref xrefFetcher = new EnsemblXref();
306 List<DBRefEntry> xrefs = xrefFetcher.getCrossReferences(seq.getName(),
307 getCrossReferenceDatabases());
308 for (DBRefEntry xref : xrefs)
312 * Save any Uniprot xref to be the reference for SIFTS mapping
314 if (DBRefSource.UNIPROT.equals(xref.getSource()))
316 seq.setSourceDBRef(xref);
322 * Returns a list of database names to be used when fetching cross-references.
326 protected List<String> getCrossReferenceDatabases()
328 return CROSS_REFERENCES;
332 * Returns a mapping from dna to protein by inspecting sequence features of
333 * type "CDS" on the dna.
339 protected MapList mapCdsToProtein(SequenceI dnaSeq, SequenceI proteinSeq)
341 List<int[]> ranges = new ArrayList<int[]>(50);
343 int mappedDnaLength = getCdsRanges(dnaSeq, ranges);
345 int proteinLength = proteinSeq.getLength();
346 int proteinEnd = proteinLength;
347 int proteinStart = 1;
350 * incomplete start codon may mean X at start of peptide
351 * we ignore both for mapping purposes
353 if (proteinSeq.getCharAt(0) == 'X')
358 List<int[]> proteinRange = new ArrayList<int[]>();
361 * dna length should map to protein (or protein plus stop codon)
363 int codesForResidues = mappedDnaLength / 3;
364 if (codesForResidues == (proteinLength + 1))
366 MappingUtils.unmapStopCodon(ranges, mappedDnaLength);
369 if (codesForResidues == proteinLength)
371 proteinRange.add(new int[] { proteinStart, proteinEnd });
372 return new MapList(ranges, proteinRange, 3, 1);
378 * Adds CDS ranges to the ranges list, and returns the total length mapped
381 * No need to worry about reverse strand dna, here since the retrieved
382 * sequence is as transcribed (reverse complement for reverse strand), i.e in
383 * the same sense as the peptide.
389 protected int getCdsRanges(SequenceI dnaSeq, List<int[]> ranges)
391 SequenceFeature[] sfs = dnaSeq.getSequenceFeatures();
396 SequenceOntologyI so = SequenceOntologyFactory.getInstance();
397 int mappedDnaLength = 0;
398 for (SequenceFeature sf : sfs)
401 * process a CDS feature (or a sub-type of CDS)
403 if (so.isA(sf.getType(), SequenceOntologyI.CDS))
407 phase = Integer.parseInt(sf.getPhase());
408 } catch (NumberFormatException e)
413 * phase > 0 on first codon means 5' incomplete - skip to the start
414 * of the next codon; example ENST00000496384
416 int begin = sf.getBegin();
417 int end = sf.getEnd();
418 if (ranges.isEmpty())
423 continue; // shouldn't happen?
426 ranges.add(new int[] { begin, end });
427 mappedDnaLength += Math.abs(end - begin) + 1;
430 return mappedDnaLength;
434 * Fetches sequences for the list of accession ids and adds them to the
435 * alignment. Returns the extended (or created) alignment.
440 * @throws JalviewException
441 * @throws IOException
443 protected AlignmentI fetchSequences(List<String> ids, AlignmentI alignment)
444 throws JalviewException, IOException
446 if (!isEnsemblAvailable())
449 throw new JalviewException("ENSEMBL Rest API not available.");
451 FileParse fp = getSequenceReader(ids);
452 FastaFile fr = new FastaFile(fp);
453 if (fr.hasWarningMessage())
455 System.out.println(String.format(
456 "Warning when retrieving %d ids %s\n%s", ids.size(),
457 ids.toString(), fr.getWarningMessage()));
459 else if (fr.getSeqs().size() != ids.size())
461 System.out.println(String.format(
462 "Only retrieved %d sequences for %d query strings", fr
463 .getSeqs().size(), ids.size()));
466 if (fr.getSeqs().size() == 1 && fr.getSeqs().get(0).getLength() == 0)
469 * POST request has returned an empty FASTA file e.g. for invalid id
471 throw new IOException("No data returned for " + ids);
474 if (fr.getSeqs().size() > 0)
476 AlignmentI seqal = new Alignment(
477 fr.getSeqsAsArray());
478 for (SequenceI sq:seqal.getSequences())
480 if (sq.getDescription() == null)
482 sq.setDescription(getDbName());
484 String name = sq.getName();
485 if (ids.contains(name)
486 || ids.contains(name.replace("ENSP", "ENST")))
488 DBRefUtils.parseToDbRef(sq, DBRefSource.ENSEMBL, "0", name);
491 if (alignment == null)
497 alignment.append(seqal);
504 * Returns the URL for the REST call
507 * @throws MalformedURLException
510 protected URL getUrl(List<String> ids) throws MalformedURLException
513 * a single id is included in the URL path
514 * multiple ids go in the POST body instead
516 StringBuffer urlstring = new StringBuffer(128);
517 urlstring.append(SEQUENCE_ID_URL);
520 urlstring.append("/").append(ids.get(0));
522 // @see https://github.com/Ensembl/ensembl-rest/wiki/Output-formats
523 urlstring.append("?type=").append(getSourceEnsemblType().getType());
524 urlstring.append(("&Accept=text/x-fasta"));
526 URL url = new URL(urlstring.toString());
531 * A sequence/id POST request currently allows up to 50 queries
533 * @see http://rest.ensembl.org/documentation/info/sequence_id_post
536 public int getMaximumQueryCount()
542 protected boolean useGetRequest()
548 protected String getRequestMimeType(boolean multipleIds)
550 return multipleIds ? "application/json" : "text/x-fasta";
554 protected String getResponseMimeType()
556 return "text/x-fasta";
561 * @return the configured sequence return type for this source
563 protected abstract EnsemblSeqType getSourceEnsemblType();
566 * Returns a list of [start, end] genomic ranges corresponding to the sequence
569 * The correspondence between the frames of reference is made by locating
570 * those features on the genomic sequence which identify the retrieved
571 * sequence. Specifically
573 * <li>genomic sequence is identified by "transcript" features with
574 * ID=transcript:transcriptId</li>
575 * <li>cdna sequence is identified by "exon" features with
576 * Parent=transcript:transcriptId</li>
577 * <li>cds sequence is identified by "CDS" features with
578 * Parent=transcript:transcriptId</li>
581 * The returned ranges are sorted to run forwards (for positive strand) or
582 * backwards (for negative strand). Aborts and returns null if both positive
583 * and negative strand are found (this should not normally happen).
585 * @param sourceSequence
588 * the start position of the sequence we are mapping to
591 protected MapList getGenomicRangesFromFeatures(SequenceI sourceSequence,
592 String accId, int start)
594 SequenceFeature[] sfs = sourceSequence.getSequenceFeatures();
601 * generously initial size for number of cds regions
602 * (worst case titin Q8WZ42 has c. 313 exons)
604 List<int[]> regions = new ArrayList<int[]>(100);
605 int mappedLength = 0;
606 int direction = 1; // forward
607 boolean directionSet = false;
609 for (SequenceFeature sf : sfs)
612 * accept the target feature type or a specialisation of it
613 * (e.g. coding_exon for exon)
615 if (identifiesSequence(sf, accId))
617 int strand = sf.getStrand();
618 strand = strand == 0 ? 1 : strand; // treat unknown as forward
620 if (directionSet && strand != direction)
622 // abort - mix of forward and backward
623 System.err.println("Error: forward and backward strand for "
631 * add to CDS ranges, semi-sorted forwards/backwards
635 regions.add(0, new int[] { sf.getEnd(), sf.getBegin() });
639 regions.add(new int[] { sf.getBegin(), sf.getEnd() });
641 mappedLength += Math.abs(sf.getEnd() - sf.getBegin() + 1);
646 * 'gene' sequence is contiguous so we can stop as soon as its
647 * identifying feature has been found
654 if (regions.isEmpty())
656 System.out.println("Failed to identify target sequence for " + accId
657 + " from genomic features");
662 * a final sort is needed since Ensembl returns CDS sorted within source
663 * (havana / ensembl_havana)
665 Collections.sort(regions, new RangeSorter(direction == 1));
667 List<int[]> to = Arrays.asList(new int[] { start,
668 start + mappedLength - 1 });
670 return new MapList(regions, to, 1, 1);
674 * Answers true if the sequence being retrieved may occupy discontiguous
675 * regions on the genomic sequence.
677 protected boolean isSpliceable()
683 * Returns true if the sequence feature marks positions of the genomic
684 * sequence feature which are within the sequence being retrieved. For
685 * example, an 'exon' feature whose parent is the target transcript marks the
686 * cdna positions of the transcript.
692 protected abstract boolean identifiesSequence(SequenceFeature sf,
696 * Transfers the sequence feature to the target sequence, locating its start
697 * and end range based on the mapping. Features which do not overlap the
698 * target sequence are ignored.
701 * @param targetSequence
703 * mapping from the sequence feature's coordinates to the target
706 protected void transferFeature(SequenceFeature sf,
707 SequenceI targetSequence, MapList mapping)
709 int start = sf.getBegin();
710 int end = sf.getEnd();
711 int[] mappedRange = mapping.locateInTo(start, end);
713 if (mappedRange != null)
715 SequenceFeature copy = new SequenceFeature(sf);
716 copy.setBegin(Math.min(mappedRange[0], mappedRange[1]));
717 copy.setEnd(Math.max(mappedRange[0], mappedRange[1]));
718 targetSequence.addSequenceFeature(copy);
721 * for sequence_variant, make an additional feature with consequence
723 // if (SequenceOntologyFactory.getInstance().isA(sf.getType(),
724 // SequenceOntologyI.SEQUENCE_VARIANT))
726 // String consequence = (String) sf.getValue(CONSEQUENCE_TYPE);
727 // if (consequence != null)
729 // SequenceFeature sf2 = new SequenceFeature("consequence",
730 // consequence, copy.getBegin(), copy.getEnd(), 0f,
732 // targetSequence.addSequenceFeature(sf2);
739 * Transfers features from sourceSequence to targetSequence
742 * @param sourceSequence
743 * @param targetSequence
744 * @return true if any features were transferred, else false
746 protected boolean transferFeatures(String accessionId,
747 SequenceI sourceSequence, SequenceI targetSequence)
749 if (sourceSequence == null || targetSequence == null)
754 // long start = System.currentTimeMillis();
755 SequenceFeature[] sfs = sourceSequence.getSequenceFeatures();
756 MapList mapping = getGenomicRangesFromFeatures(sourceSequence, accessionId,
757 targetSequence.getStart());
763 boolean result = transferFeatures(sfs, targetSequence, mapping,
765 // System.out.println("transferFeatures (" + (sfs.length) + " --> "
766 // + targetSequence.getSequenceFeatures().length + ") to "
767 // + targetSequence.getName()
768 // + " took " + (System.currentTimeMillis() - start) + "ms");
773 * Transfer features to the target sequence. The start/end positions are
774 * converted using the mapping. Features which do not overlap are ignored.
775 * Features whose parent is not the specified identifier are also ignored.
778 * @param targetSequence
783 protected boolean transferFeatures(SequenceFeature[] features,
784 SequenceI targetSequence, MapList mapping, String parentId)
786 final boolean forwardStrand = mapping.isFromForwardStrand();
789 * sort features by start position (descending if reverse strand)
790 * before transferring (in forwards order) to the target sequence
792 Arrays.sort(features, new Comparator<SequenceFeature>()
795 public int compare(SequenceFeature o1, SequenceFeature o2)
797 int c = Integer.compare(o1.getBegin(), o2.getBegin());
798 return forwardStrand ? c : -c;
802 boolean transferred = false;
803 for (SequenceFeature sf : features)
805 if (retainFeature(sf, parentId))
807 transferFeature(sf, targetSequence, mapping);
815 * Answers true if the feature type is one we want to keep for the sequence.
816 * Some features are only retrieved in order to identify the sequence range,
817 * and may then be discarded as redundant information (e.g. "CDS" feature for
820 @SuppressWarnings("unused")
821 protected boolean retainFeature(SequenceFeature sf, String accessionId)
823 return true; // override as required
827 * Answers true if the feature has a Parent which refers to the given
828 * accession id, or if the feature has no parent. Answers false if the
829 * feature's Parent is for a different accession id.
835 protected boolean featureMayBelong(SequenceFeature sf, String identifier)
837 String parent = (String) sf.getValue(PARENT);
838 // using contains to allow for prefix "gene:", "transcript:" etc
839 if (parent != null && !parent.contains(identifier))
841 // this genomic feature belongs to a different transcript
848 public String getDescription()
850 return "Ensembl " + getSourceEnsemblType().getType()
851 + " sequence with variant features";
855 * Returns a (possibly empty) list of features on the sequence which have the
856 * specified sequence ontology type (or a sub-type of it), and the given
857 * identifier as parent
864 protected List<SequenceFeature> findFeatures(SequenceI sequence,
865 String type, String parentId)
867 List<SequenceFeature> result = new ArrayList<SequenceFeature>();
869 SequenceFeature[] sfs = sequence.getSequenceFeatures();
871 SequenceOntologyI so = SequenceOntologyFactory.getInstance();
872 for (SequenceFeature sf :sfs) {
873 if (so.isA(sf.getType(), type))
875 String parent = (String) sf.getValue(PARENT);
876 if (parent.equals(parentId))
887 * Maps exon features from dna to protein, and computes variants in peptide
888 * product generated by variants in dna, and adds them as sequence_variant
889 * features on the protein sequence. Returns the number of variant features
894 * @param dnaToProtein
896 static int computeProteinFeatures(SequenceI dnaSeq,
897 SequenceI peptide, MapList dnaToProtein)
899 while (dnaSeq.getDatasetSequence() != null)
901 dnaSeq = dnaSeq.getDatasetSequence();
903 while (peptide.getDatasetSequence() != null)
905 peptide = peptide.getDatasetSequence();
908 AlignmentUtils.transferFeatures(dnaSeq, peptide, dnaToProtein,
909 SequenceOntologyI.EXON);
911 LinkedHashMap<Integer, String[][]> variants = buildDnaVariantsMap(
912 dnaSeq, dnaToProtein);
915 * scan codon variations, compute peptide variants and add to peptide sequence
918 for (Entry<Integer, String[][]> variant : variants.entrySet())
920 int peptidePos = variant.getKey();
921 String[][] codonVariants = variant.getValue();
922 String residue = String.valueOf(peptide.getCharAt(peptidePos - 1)); // 0-based
923 List<String> peptideVariants = computePeptideVariants(codonVariants,
925 if (!peptideVariants.isEmpty())
927 String desc = StringUtils.listToDelimitedString(peptideVariants,
929 SequenceFeature sf = new SequenceFeature(
930 SequenceOntologyI.SEQUENCE_VARIANT, desc, peptidePos,
931 peptidePos, 0f, null);
932 peptide.addSequenceFeature(sf);
938 * ugly sort to get sequence features in start position order
939 * - would be better to store in Sequence as a TreeSet instead?
941 Arrays.sort(peptide.getSequenceFeatures(),
942 new Comparator<SequenceFeature>()
945 public int compare(SequenceFeature o1, SequenceFeature o2)
947 int c = Integer.compare(o1.getBegin(), o2.getBegin());
948 return c == 0 ? Integer.compare(o1.getEnd(), o2.getEnd())
956 * Builds a map whose key is position in the protein sequence, and value is an
957 * array of all variants for the coding codon positions
960 * @param dnaToProtein
963 static LinkedHashMap<Integer, String[][]> buildDnaVariantsMap(
964 SequenceI dnaSeq, MapList dnaToProtein)
967 * map from peptide position to all variant features of the codon for it
968 * LinkedHashMap ensures we add the peptide features in sequence order
970 LinkedHashMap<Integer, String[][]> variants = new LinkedHashMap<Integer, String[][]>();
971 SequenceOntologyI so = SequenceOntologyFactory.getInstance();
973 SequenceFeature[] dnaFeatures = dnaSeq.getSequenceFeatures();
974 if (dnaFeatures == null)
979 int dnaStart = dnaSeq.getStart();
980 int[] lastCodon = null;
981 int lastPeptidePostion = 0;
984 * build a map of codon variations for peptides
986 for (SequenceFeature sf : dnaFeatures)
988 int dnaCol = sf.getBegin();
989 if (dnaCol != sf.getEnd())
991 // not handling multi-locus variant features
994 if (so.isA(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT))
996 int[] mapsTo = dnaToProtein.locateInTo(dnaCol, dnaCol);
999 // feature doesn't lie within coding region
1002 int peptidePosition = mapsTo[0];
1003 String[][] codonVariants = variants.get(peptidePosition);
1004 if (codonVariants == null)
1006 codonVariants = new String[3][];
1007 variants.put(peptidePosition, codonVariants);
1011 * extract dna variants to a string array
1013 String alls = (String) sf.getValue("alleles");
1018 String[] alleles = alls.split(",");
1021 * get this peptides codon positions e.g. [3, 4, 5] or [4, 7, 10]
1023 int[] codon = peptidePosition == lastPeptidePostion ? lastCodon
1024 : MappingUtils.flattenRanges(dnaToProtein.locateInFrom(
1025 peptidePosition, peptidePosition));
1026 lastPeptidePostion = peptidePosition;
1030 * save nucleotide (and this variant) for each codon position
1032 for (int codonPos = 0; codonPos < 3; codonPos++)
1034 String nucleotide = String.valueOf(dnaSeq
1035 .getCharAt(codon[codonPos] - dnaStart));
1036 if (codon[codonPos] == dnaCol)
1039 * record current dna base and its alleles
1041 String[] dnaVariants = new String[alleles.length + 1];
1042 dnaVariants[0] = nucleotide;
1043 System.arraycopy(alleles, 0, dnaVariants, 1, alleles.length);
1044 codonVariants[codonPos] = dnaVariants;
1046 else if (codonVariants[codonPos] == null)
1049 * record current dna base only
1050 * (at least until we find any variation and overwrite it)
1052 codonVariants[codonPos] = new String[] { nucleotide };
1061 * Returns a sorted, non-redundant list of all peptide translations generated
1062 * by the given dna variants, excluding the current residue value
1064 * @param codonVariants
1065 * an array of base values (acgtACGT) for codon positions 1, 2, 3
1067 * the current residue translation
1070 static List<String> computePeptideVariants(
1071 String[][] codonVariants, String residue)
1073 List<String> result = new ArrayList<String>();
1074 for (String base1 : codonVariants[0])
1076 for (String base2 : codonVariants[1])
1078 for (String base3 : codonVariants[2])
1080 String codon = base1 + base2 + base3;
1081 // TODO: report frameshift/insertion/deletion
1082 // and multiple-base variants?!
1083 String peptide = codon.contains("-") ? "-" : ResidueProperties
1084 .codonTranslate(codon);
1085 if (peptide != null && !result.contains(peptide)
1086 && !peptide.equalsIgnoreCase(residue))
1088 result.add(peptide);
1095 * sort alphabetically with STOP at the end
1097 Collections.sort(result, new Comparator<String>()
1101 public int compare(String o1, String o2)
1103 if ("STOP".equals(o1))
1107 else if ("STOP".equals(o2))
1113 return o1.compareTo(o2);
1121 * Answers true if the feature type is either 'NMD_transcript_variant' or
1122 * 'transcript' or one of its sub-types in the Sequence Ontology. This is
1123 * needed because NMD_transcript_variant behaves like 'transcript' in Ensembl
1124 * although strictly speaking it is not (it is a sub-type of
1125 * sequence_variant).
1127 * @param featureType
1130 public static boolean isTranscript(String featureType)
1132 return SequenceOntologyI.NMD_TRANSCRIPT_VARIANT.equals(featureType)
1133 || SequenceOntologyFactory.getInstance().isA(featureType,
1134 SequenceOntologyI.TRANSCRIPT);