Beacon VQS Requests

The VQSrequest type represents the generic collection of variant parameters supported in Beacon v2+ requests. These include parameters with close alignment to VRS v2 concepts and replacing some Beacon v1/v2 generics with tighter definitions (e.g. referenceAccession instead of referenceName and accession or copyChange for a specific subset of former variantType values) but also keep some conceptsm beyond VRS scope or specifically geared towards query applications (geneId, sequenceLength)

For the parameter definitions please see the requestParameterComponents page.

VQSrequest Parameters

requestProfile: ./requestParameterComponents.yaml#/$defs/RequestProfileId

referenceAccession: ./requestParameterComponents.yaml#/$defs/RefgetAccession

start: ./requestParameterComponents.yaml#/$defs/SequenceStart

end: ./requestParameterComponents.yaml#/$defs/SequenceEnd

sequence: ./requestParameterComponents.yaml#/$defs/Sequence

copyChange: ./requestParameterComponents.yaml#/$defs/CopyChange

adjacencyAccession: ./requestParameterComponents.yaml#/$defs/AdjacencyAccession

adjacencyStart: ./requestParameterComponents.yaml#/$defs/AdjacencyStart

adjacencyEnd: ./requestParameterComponents.yaml#/$defs/AdjacencyEnd

repeatSubunitCount: ./requestParameterComponents.yaml#/$defs/RepeatSubunitCount

repeatSubunitLength: ./requestParameterComponents.yaml#/$defs/RepeatSubunitLength

geneId: ./requestParameterComponents.yaml#/$defs/GeneId

aminoacidChange: ./requestParameterComponents.yaml#/$defs/AminoacidChange

genomicAlleleShortForm: ./requestParameterComponents.yaml#/$defs/GenomicAlleleShortForm

sequenceLength: ./requestParameterComponents.yaml#/$defs/SequenceLength

vrsType: ./requestParameterComponents.yaml#/$defs/VRStype

genomicFeatures: ./requestParameterComponents.yaml#/$defs/GenomicFeature

phenoClinicEffects: ./requestParameterComponents.yaml#/$defs/PhenoClinicEffect

Beacon v2+/VQS "VRSified" Request Examples

Copy number gains involving the whole locus chr2:54,700,000-63,900,000

Solution for VQSrequest using start and end ranges (VQScopyChangeRequest)

The query has to indicate the involved genomic region by positions as well as the type of change. Here, matched duplication events start 5` of the region and end 3` of it. For capturing any event upt to the complete chromosome duplication this requires knowledge about the maximum value (i.e. chromosome base length; using a random very large number might fail depending on the implementation).

The example uses "copyChange": "EFO:0030070" for copy number gain as specified in the VRS definitions.

Request

• requestProfile: VQScopyChangeRequest

• referenceAccession: refseq:NC_000002.12

• start:

  • 0
  • 54700000

• end:

  • 63900000
  • 242193529

• copyChange: EFO:0030070

• vrsType: CopyNumberChange

GET query string

?requestProfile=VQScopyChangeRequest&referenceAccession=refseq:NC_000002.12&start=0,54700000&end=63900000,242193529&copyChange=EFO:0030070&vrsType=CopyNumberChange

POST query component

{
    "copyChange": "EFO:0030070",
    "end": [
        63900000,
        242193529
    ],
    "referenceAccession": "refseq:NC_000002.12",
    "requestProfile": "VQScopyChangeRequest",
    "start": [
        0,
        54700000
    ],
    "vrsType": "CopyNumberChange"
}

Focal high-level deletion involving the CDKN2A locus

Solution for VQSrequest using start and end ranges (VQScopyChangeRequest)

To match deletion variants overlapping the CDKN2A gene's coding region (CDR) with at least a single base, but limited to "focal" hits (here i.e. <= ~2Mbp in size) a bracket query is constructed where the start range goes from ~1Mb 5\' of the CDKN2A CDR until the end of the CDR and the end range goes from the start of the CDR to ~1Mb 3\' of the gene.

The query uses "copyChange": "EFO:0020073" for high-level copy number loss as specified in the VRS definitions. With hierarchical expansion of this term explicit complete genomic deletions (EFO:0030069) should be retrieved too.

Request

• requestProfile: VQScopyChangeRequest

• referenceAccession: refseq:NC_000002.12

• start:

  • 21000001
  • 21975098

• end:

  • 21967753
  • 23000000

• copyChange: EFO:0020073

• vrsType: CopyNumberChange

GET query string

?requestProfile=VQScopyChangeRequest&referenceAccession=refseq:NC_000002.12&start=21000001,21975098&end=21967753,23000000&copyChange=EFO:0020073&vrsType=CopyNumberChange

POST query component

{
    "copyChange": "EFO:0020073",
    "end": [
        21967753,
        23000000
    ],
    "referenceAccession": "refseq:NC_000002.12",
    "requestProfile": "VQScopyChangeRequest",
    "start": [
        21000001,
        21975098
    ],
    "vrsType": "CopyNumberChange"
}

Find t(8;14)(q24;q32) translocations

Solution for VQSrequest using genomic ranges (VQSadjacencyRequest)

This is a query for translocations between the MYC and IgH loci, where the breakpoints are loosely defined through there well known cytogenetic bands. The query here follows the VRS adjacency model. In contrast to the VRS representational model, here:

• VRS uses an array of 2 genomic locations while Beacon names the location parameters individually (using "adjacency..." for the second partner)
• VRS explicitely encodes directionality by using either start or end position parameters (integers or ranges) while this query example creates non-directional ranges on both sides since directionality might not be known, the storage system might not encode this or all options could be of interest

Request

• requestProfile: VQSadjacencyRequest

• referenceAccession: refseq:NC_000008.11

• start: 116700000

• end: 145138636

• adjacencyAccession: refseq:NC_000014.9

• adjacencyStart: 89300000

• adjacencyEnd: 107043718

• vrsType: Adjacency

GET query string

?requestProfile=VQSadjacencyRequest&referenceAccession=refseq:NC_000008.11&start=116700000&end=145138636&adjacencyAccession=refseq:NC_000014.9&adjacencyStart=89300000&adjacencyEnd=107043718&vrsType=Adjacency

POST query component

{
    "adjacencyAccession": "refseq:NC_000014.9",
    "adjacencyEnd": 107043718,
    "adjacencyStart": 89300000,
    "end": 145138636,
    "referenceAccession": "refseq:NC_000008.11",
    "requestProfile": "VQSadjacencyRequest",
    "start": 116700000,
    "vrsType": "Adjacency"
}

CAG repeat in the first exon of the huntingtin gene (HTT)

The gene HTT is located at position 4p16.3. In individuals without Huntington's disease, this CAG segment is typically repeated 10 to 35 times. Expansions beyond 35 copys are associated with the development of Huntington's disease.

Examples for query parameters are:

• GeneId: HTT
• referenceAccession: refseq:NC_000004.12
• start: 3074681
• end: 3243960
• RepeatSubunitLength: 3 (CAG)
• RepeatSubunitCount: [36, 250] (not yet defined in VRS or Beacon)
• SequenceLength: [105, 750]

See also the genome browser material.

Solution using VQSsequenceRepeatRequest with locus and sequenceLength

This example uses the HTT genome position and a range of (extended) sequence lengths to match against a ReferenceLengthExpression since the VRS v2 model does not contain a "repeat count" concept but only the overall length and unit length (as well as the sequence).

TODO: Limit location to first exon?

Request

• requestProfile: VQSsequenceRepeatRequest

• referenceAccession: refseq:NC_000004.12

• start: 3074681

• end: 3243960

• repeatSubunitLength: 3

• sequenceLength:

  • 105
  • 750

• vrsType: ReferenceLengthExpression

GET query string

?requestProfile=VQSsequenceRepeatRequest&referenceAccession=refseq:NC_000004.12&start=3074681&end=3243960&repeatSubunitLength=3&sequenceLength=105,750&vrsType=ReferenceLengthExpression

POST query component

{
    "end": 3243960,
    "referenceAccession": "refseq:NC_000004.12",
    "repeatSubunitLength": 3,
    "requestProfile": "VQSsequenceRepeatRequest",
    "sequenceLength": [
        105,
        750
    ],
    "start": 3074681,
    "vrsType": "ReferenceLengthExpression"
}

CAG repeat in the first exon of the huntingtin gene (HTT)

For details see above.

Solution using VQSsequenceRepeatRequest with geneId and sequenceLength

Here instead of the position simply the gene symbol is being used.

Request

• requestProfile: VQSsequenceRepeatRequest

• geneId: HTT

• repeatSubunitLength: 3

• sequenceLength:

  • 105
  • 750

• vrsType: ReferenceLengthExpression

GET query string

?requestProfile=VQSsequenceRepeatRequest&geneId=HTT&repeatSubunitLength=3&sequenceLength=105,750&vrsType=ReferenceLengthExpression

POST query component

{
    "geneId": "HTT",
    "repeatSubunitLength": 3,
    "requestProfile": "VQSsequenceRepeatRequest",
    "sequenceLength": [
        105,
        750
    ],
    "vrsType": "ReferenceLengthExpression"
}

CGG trinucleotide repeat expansion in the FMR1 gene

A CGG trinucleotide repeat expansion in the FMR1 gene on the X chromosome (Xq27.3) is known to cause Fragile X Syndrome (FXS). CGG repeating less than 44 times are stable across generations.

Solution using VQSsequenceRepeatRequest with geneId and sequenceLength

Similarly to the HTT example here a geneId is used to specify the gene and a range of sequence lengths is used to match against a ReferenceLengthExpression.

Request

• requestProfile: VQSsequenceRepeatRequest

• geneId: FMR1

• repeatSubunitLength: 3

• sequenceLength:

  • 130
  • 600

• vrsType: ReferenceLengthExpression

GET query string

?requestProfile=VQSsequenceRepeatRequest&geneId=FMR1&repeatSubunitLength=3&sequenceLength=130,600&vrsType=ReferenceLengthExpression

POST query component

{
    "geneId": "FMR1",
    "repeatSubunitLength": 3,
    "requestProfile": "VQSsequenceRepeatRequest",
    "sequenceLength": [
        130,
        600
    ],
    "vrsType": "ReferenceLengthExpression"
}

Query for a focal deletion involving TP53

Solution using VQSgeneIdRequest with geneId

Query for a deletion involving TP53 by using the HUGO name to specify the gene. This request does not provide coordinates so on the server side matching has to be performed from annotated variants or by retrieving the gene's coordinates and creating internally a type of range request. Here we're also limiting the size of the CNV to a typical "focal deletion" with a lower minimum size of 1kb (to avoid noise and non-structural variants) and an upper limit of 3Mb (to avoid large chromosomal deletions).

Request

• requestType: VQSgeneIdRequest

• geneId: TP53

• copyChange: EFO:0030067

• sequenceLength:

  • 1000
  • 3000000

• vrsType: CopyNumberChange

GET query string

?requestType=VQSgeneIdRequest&geneId=TP53&copyChange=EFO:0030067&sequenceLength=1000,3000000&vrsType=CopyNumberChange

POST query component

{
    "copyChange": "EFO:0030067",
    "geneId": "TP53",
    "requestType": "VQSgeneIdRequest",
    "sequenceLength": [
        1000,
        3000000
    ],
    "vrsType": "CopyNumberChange"
}