1 package jalview.io.vcf;
3 import static org.testng.Assert.assertEquals;
5 import jalview.datamodel.AlignmentI;
6 import jalview.datamodel.DBRefEntry;
7 import jalview.datamodel.GeneLoci;
8 import jalview.datamodel.Mapping;
9 import jalview.datamodel.Sequence;
10 import jalview.datamodel.SequenceFeature;
11 import jalview.datamodel.SequenceI;
12 import jalview.gui.AlignFrame;
13 import jalview.io.DataSourceType;
14 import jalview.io.FileLoader;
15 import jalview.io.gff.Gff3Helper;
16 import jalview.io.gff.SequenceOntologyI;
17 import jalview.util.MapList;
20 import java.io.IOException;
21 import java.io.PrintWriter;
22 import java.util.Arrays;
23 import java.util.List;
25 import org.testng.annotations.Test;
27 public class VCFLoaderTest
29 // columns 9717- of gene P30419 from Ensembl (modified)
30 private static final String FASTA = ">ENSG00000136448/1-25 chromosome:GRCh38:17:45051610:45051634:1\n"
31 + "CAAGCTGGCGGACGAGAGTGTGACA\n"
32 // and a 'made up' mini-transcript with two exons
33 + ">ENST00000592782/1-18\n--AGCTGGCG----AGAGTGTGAC-\n";
35 private static final String[] VCF = { "##fileformat=VCFv4.2",
36 "##INFO=<ID=AF,Number=A,Type=Float,Description=\"Allele Frequency, for each ALT allele, in the same order as listed\">",
38 "#CHROM\tPOS\tID\tREF\tALT\tQUAL\tFILTER\tINFO",
39 // SNP A/T in position 2 of gene sequence (precedes transcript)
40 "17\t45051611\t.\tA\tT\t1666.64\tRF\tAC=15;AF=5.08130e-03",
41 // SNP G/C in position 4 of gene sequence, position 2 of transcript
42 // this is a mixed variant, the insertion G/GA is not transferred
43 "17\t45051613\t.\tG\tGA,C\t1666.64\tRF\tAC=15;AF=3.08130e-03" };
45 @Test(groups = "Functional")
46 public void testLoadVCF() throws IOException
48 AlignmentI al = buildAlignment();
49 VCFLoader loader = new VCFLoader(al);
53 loader.loadVCF(f.getPath(), null);
56 * verify variant feature(s) added to gene
58 List<SequenceFeature> geneFeatures = al.getSequenceAt(0)
59 .getSequenceFeatures();
60 assertEquals(geneFeatures.size(), 2);
61 SequenceFeature sf = geneFeatures.get(0);
62 assertEquals(sf.getFeatureGroup(), "VCF");
63 assertEquals(sf.getBegin(), 2);
64 assertEquals(sf.getEnd(), 2);
65 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
66 assertEquals(sf.getScore(), 5.08130e-03, 0.000001f);
67 assertEquals("A,T", sf.getValue(Gff3Helper.ALLELES));
69 sf = geneFeatures.get(1);
70 assertEquals(sf.getFeatureGroup(), "VCF");
71 assertEquals(sf.getBegin(), 4);
72 assertEquals(sf.getEnd(), 4);
73 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
74 assertEquals(sf.getScore(), 3.08130e-03, 0.000001f);
75 assertEquals("G,C", sf.getValue(Gff3Helper.ALLELES));
78 * verify variant feature(s) added to transcript
80 List<SequenceFeature> transcriptFeatures = al.getSequenceAt(1)
81 .getSequenceFeatures();
82 assertEquals(transcriptFeatures.size(), 1);
83 sf = transcriptFeatures.get(0);
84 assertEquals(sf.getFeatureGroup(), "VCF");
85 assertEquals(sf.getBegin(), 2);
86 assertEquals(sf.getEnd(), 2);
87 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
88 assertEquals(sf.getScore(), 3.08130e-03, 0.000001f);
89 assertEquals("G,C", sf.getValue(Gff3Helper.ALLELES));
92 * verify variant feature(s) computed and added to protein
93 * first codon AGC varies to ACC giving S/T
95 SequenceI peptide = al.getSequenceAt(1)
96 .getDBRefs()[0].getMap().getTo();
97 List<SequenceFeature> proteinFeatures = peptide.getSequenceFeatures();
98 assertEquals(proteinFeatures.size(), 1);
99 sf = proteinFeatures.get(0);
100 assertEquals(sf.getFeatureGroup(), "VCF");
101 assertEquals(sf.getBegin(), 1);
102 assertEquals(sf.getEnd(), 1);
103 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
104 assertEquals(sf.getDescription(), "p.Ser1Thr");
107 private File makeVcf() throws IOException
109 File f = File.createTempFile("Test", ".vcf");
111 PrintWriter pw = new PrintWriter(f);
112 for (String vcfLine : VCF)
121 * Make a simple alignment with one 'gene' and one 'transcript'
125 private AlignmentI buildAlignment()
127 AlignFrame af = new FileLoader().LoadFileWaitTillLoaded(FASTA,
128 DataSourceType.PASTE);
131 * map gene sequence to chromosome (normally done when the sequence is fetched
132 * from Ensembl and transcripts computed)
134 AlignmentI alignment = af.getViewport().getAlignment();
135 int[][] to = new int[][] { new int[] { 45051610, 45051634 } };
136 List<int[]> toRanges = Arrays.asList(to);
137 SequenceI gene = alignment.getSequenceAt(0);
138 List<int[]> fromRanges = Arrays.asList(new int[][] { new int[] {
139 gene.getStart(), gene.getEnd() } });
140 ((Sequence) gene).setGeneLoci(new GeneLoci("human", "GRCh38", "17",
141 new MapList(fromRanges, toRanges, 1, 1)));
144 * map 'transcript' to chromosome via 'gene'
145 * transcript/1-18 is gene/3-10,15-24
146 * which is chromosome 45051612-45051619,45051624-45051633
148 to = new int[][] { new int[] { 45051612, 45051619 },
149 new int[] { 45051624, 45051633 } };
150 toRanges = Arrays.asList(to);
151 SequenceI transcript = alignment.getSequenceAt(1);
152 fromRanges = Arrays.asList(new int[][] { new int[] {
153 transcript.getStart(), transcript.getEnd() } });
154 ((Sequence) transcript).setGeneLoci(new GeneLoci("human", "GRCh38",
155 "17", new MapList(fromRanges, toRanges, 1, 1)));
158 * add a protein product as a DBRef on the transcript
160 SequenceI peptide = new Sequence("ENSP001", "SWRECD");
161 MapList mapList = new MapList(new int[] { 1, 18 }, new int[] { 1, 6 },
163 Mapping map = new Mapping(peptide, mapList);
164 DBRefEntry product = new DBRefEntry("", "", "ENSP001", map);
165 transcript.addDBRef(product);
171 * Test with 'gene' and 'transcript' mapped to the reverse strand of the
172 * chromosome. The VCF variant positions (in forward coordinates) should get
173 * correctly located on sequence positions.
175 * @throws IOException
177 @Test(groups = "Functional")
178 public void testLoadVCF_reverseStrand() throws IOException
180 AlignmentI al = buildAlignment();
183 * invert forward to reverse strand mappings
185 List<int[]> to = al.getSequenceAt(0).getGeneLoci().mapping
187 int temp = to.get(0)[0];
188 to.get(0)[0] = to.get(0)[1];
190 to = al.getSequenceAt(1).getGeneLoci().mapping.getToRanges();
191 to.get(0)[0] = to.get(0)[1];
193 to.get(1)[0] = to.get(1)[1];
195 int[] tmp2 = to.get(0);
196 to.set(0, to.get(1));
199 VCFLoader loader = new VCFLoader(al);
203 loader.loadVCF(f.getPath(), null);
206 * verify variant feature(s) added to gene
208 List<SequenceFeature> geneFeatures = al.getSequenceAt(0)
209 .getSequenceFeatures();
210 assertEquals(geneFeatures.size(), 2);
211 SequenceFeature sf = geneFeatures.get(0);
212 assertEquals(sf.getFeatureGroup(), "VCF");
213 assertEquals(sf.getBegin(), 2);
214 assertEquals(sf.getEnd(), 2);
215 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
216 assertEquals(sf.getScore(), 5.08130e-03, 0.000001f);
217 assertEquals("A,T", sf.getValue(Gff3Helper.ALLELES));
219 sf = geneFeatures.get(1);
220 assertEquals(sf.getFeatureGroup(), "VCF");
221 assertEquals(sf.getBegin(), 4);
222 assertEquals(sf.getEnd(), 4);
223 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
224 assertEquals(sf.getScore(), 3.08130e-03, 0.000001f);
225 assertEquals("G,C", sf.getValue(Gff3Helper.ALLELES));
228 * verify variant feature(s) added to transcript
230 List<SequenceFeature> transcriptFeatures = al.getSequenceAt(1)
231 .getSequenceFeatures();
232 assertEquals(transcriptFeatures.size(), 1);
233 sf = transcriptFeatures.get(0);
234 assertEquals(sf.getFeatureGroup(), "VCF");
235 assertEquals(sf.getBegin(), 2);
236 assertEquals(sf.getEnd(), 2);
237 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
238 assertEquals(sf.getScore(), 3.08130e-03, 0.000001f);
239 assertEquals("G,C", sf.getValue(Gff3Helper.ALLELES));
242 * verify variant feature(s) computed and added to protein
243 * first codon AGC varies to ACC giving S/T
245 SequenceI peptide = al.getSequenceAt(1).getDBRefs()[0].getMap().getTo();
246 List<SequenceFeature> proteinFeatures = peptide.getSequenceFeatures();
247 assertEquals(proteinFeatures.size(), 1);
248 sf = proteinFeatures.get(0);
249 assertEquals(sf.getFeatureGroup(), "VCF");
250 assertEquals(sf.getBegin(), 1);
251 assertEquals(sf.getEnd(), 1);
252 assertEquals(sf.getType(), SequenceOntologyI.SEQUENCE_VARIANT);
253 assertEquals(sf.getDescription(), "p.Ser1Thr");