> ## Documentation Index > Fetch the complete documentation index at: https://docs.catalog.igvf.org/llms.txt > Use this file to discover all available pages before exploring further. # QTLs > Retrieve QTLs from gene, variant, or region. Define exactly one query type: gene (gene_id or gene_name), variant (variant_id, spdi, rsid, or ca_id), or region. The limit parameter controls the page size and can not exceed 100. Pagination is 0-based. **Examples by method** These examples are grouped by method; use the `method` filter to return data from a specific method. **eQTL:** **Single result** - spdi = NC_000001.11:40241653:TGAA:TGAAATTGAA - method = eQTL **Group results** - gene_id = ENSG00000259943 - method = eQTL **spliceQTL:** **query by variant identifier** - variant_id = NC_000001.11:898757:AAAAAA:AAAAAAA - method = spliceQTL **query by gene identifier** - gene_id = ENSG00000131236 - method = spliceQTL **pQTL:** **query by variant identifier** - variant_id = NC_000002.12:27508072:T:C - method = pQTL **query by gene identifier** - gene_id = ENSG00000084734 - method = pQTL **caQTL:** **Single result** - variant_id = NC_000001.11:40241653:TGAA:TGAAATTGAA - method = caQTL **Group results** - region = chr1:40232650-40241654 - method = caQTL ## OpenAPI ````yaml /openapi/catalog-dev.openapi.json get /qtls openapi: 3.0.3 info: title: IGVF Catalog - Development description: >- Development IGVF Catalog OpenAPI compliant REST API built using tRPC with Express. Our database uses 0-based, half-open coordinates for genomic coordinates in the GRCh38 (human) and GRCm39 (mouse) reference genomes. Data is licensed under the Creative Commons license and the software is licensed under the MIT license. version: 1.2.0 - DEV servers: - url: https://catalog-api-dev.demo.igvf.org/api security: [] externalDocs: url: https://api-dev.catalog.igvf.org/openapi paths: /qtls: get: summary: QTLs description: >- Retrieve QTLs from gene, variant, or region. Define exactly one query type: gene (gene_id or gene_name), variant (variant_id, spdi, rsid, or ca_id), or region. The limit parameter controls the page size and can not exceed 100. Pagination is 0-based. **Examples by method** These examples are grouped by method; use the `method` filter to return data from a specific method. **eQTL:** **Single result** - spdi = NC_000001.11:40241653:TGAA:TGAAATTGAA - method = eQTL **Group results** - gene_id = ENSG00000259943 - method = eQTL **spliceQTL:** **query by variant identifier** - variant_id = NC_000001.11:898757:AAAAAA:AAAAAAA - method = spliceQTL **query by gene identifier** - gene_id = ENSG00000131236 - method = spliceQTL **pQTL:** **query by variant identifier** - variant_id = NC_000002.12:27508072:T:C - method = pQTL **query by gene identifier** - gene_id = ENSG00000084734 - method = pQTL **caQTL:** **Single result** - variant_id = NC_000001.11:40241653:TGAA:TGAAATTGAA - method = caQTL **Group results** - region = chr1:40232650-40241654 - method = caQTL operationId: qtls parameters: - name: gene_id in: query required: false schema: type: string - name: gene_name in: query required: false schema: type: string - name: variant_id in: query required: false schema: type: string - name: spdi in: query required: false schema: type: string - name: rsid in: query required: false schema: type: string - name: ca_id in: query required: false schema: type: string - name: region in: query required: false schema: type: string - name: biological_context in: query required: false schema: type: string - name: method in: query required: false schema: type: string enum: - eQTL - pQTL - spliceQTL - caQTL - name: source in: query required: false schema: type: string enum: - AFGR - EBI - IGVF - ENCODE - UKB - name: organism in: query required: false schema: type: string enum: - Homo sapiens default: Homo sapiens - name: page in: query required: false schema: type: number default: 0 - name: limit in: query required: false schema: type: number responses: '200': description: Successful response content: application/json: schema: type: array items: type: object properties: variant: type: object properties: chr: type: string pos: type: number spdi: type: string nullable: true rsid: anyOf: - type: string - type: array items: type: string nullable: true ca_id: type: string nullable: true required: - chr - pos additionalProperties: false gene: type: object properties: name: type: string id: type: string required: - name - id additionalProperties: false nullable: true protein_complex: type: object properties: name: type: string id: type: string required: - name - id additionalProperties: false nullable: true genomic_element: type: object properties: name: type: string chr: type: string start: type: number stop: type: number type: type: string required: - name - chr - start - stop - type additionalProperties: false nullable: true source: type: string method: type: string regulatory_type: type: string nullable: true gene_consequence: type: string nullable: true biological_context: type: string nullable: true neg_log10_pvalue: type: number nullable: true effect_size: type: number nullable: true posterior_inclusion_probability: type: number nullable: true intron_chr: type: string nullable: true intron_start: anyOf: - type: string - type: number nullable: true intron_end: anyOf: - type: string - type: number nullable: true study: type: object properties: id: type: string pmid: type: string nullable: true required: - id additionalProperties: false nullable: true files_filesets: type: string nullable: true required: - variant - gene - protein_complex - genomic_element - source - method additionalProperties: false default: $ref: '#/components/responses/error' components: responses: error: description: Error response content: application/json: schema: type: object properties: message: type: string code: type: string issues: type: array items: type: object properties: message: type: string required: - message additionalProperties: false required: - message - code additionalProperties: false ````