> ## 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. # Genomic Elements Genes > Retrieve genomic elements and gene pairs by querying genomic elements. At least one of these properties must be defined: region, files_fileset, or method. Set verbose = true to retrieve full info on the genes and genomic element. The limit parameter controls the page size and can not exceed 500. Pagination is 0-based. **Examples by method** These examples are grouped by method; use the `method` filter to return data from a specific method. **CRISPR screen:** **Single result** - region = chr1:4126791-4126792 (maximum length: 10kb) - method = CRISPR screen **Group results** - files_fileset = ENCFF968BZL - method = CRISPR screen **ENCODE-rE2G:** **Single result** - region = chr1:920016-920017 (maximum length: 10kb) - method = ENCODE-rE2G - files_fileset = ENCFF666WIM **Group results** - files_fileset = ENCFF666WIM - method = ENCODE-rE2G **Perturb-seq:** **Query by region** - region = chr1:212699339-212700840 (maximum length: 10kb) - method = Perturb-seq **Query by files_fileset** Each files_fileset maps to at most one method, so a `method` filter is usually not necessary. - files_fileset = IGVFFI3069QCRA - method = Perturb-seq ## OpenAPI ````yaml /openapi/catalog-dev.openapi.json get /genomic-elements/genes 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: /genomic-elements/genes: get: summary: Genomic Elements Genes description: >- Retrieve genomic elements and gene pairs by querying genomic elements. At least one of these properties must be defined: region, files_fileset, or method. Set verbose = true to retrieve full info on the genes and genomic element. The limit parameter controls the page size and can not exceed 500. Pagination is 0-based. **Examples by method** These examples are grouped by method; use the `method` filter to return data from a specific method. **CRISPR screen:** **Single result** - region = chr1:4126791-4126792 (maximum length: 10kb) - method = CRISPR screen **Group results** - files_fileset = ENCFF968BZL - method = CRISPR screen **ENCODE-rE2G:** **Single result** - region = chr1:920016-920017 (maximum length: 10kb) - method = ENCODE-rE2G - files_fileset = ENCFF666WIM **Group results** - files_fileset = ENCFF666WIM - method = ENCODE-rE2G **Perturb-seq:** **Query by region** - region = chr1:212699339-212700840 (maximum length: 10kb) - method = Perturb-seq **Query by files_fileset** Each files_fileset maps to at most one method, so a `method` filter is usually not necessary. - files_fileset = IGVFFI3069QCRA - method = Perturb-seq operationId: genesFromGenomicElements parameters: - name: region in: query required: false schema: type: string - name: source_annotation in: query required: false schema: type: string enum: - 'CA-CTCF: chromatin accessible + CTCF binding' - 'CA-H3K4me3: chromatin accessible + H3K4me3 high signal' - 'CA-TF: chromatin accessible + TF binding' - 'CA: chromatin accessible' - 'PLS: Promoter-like signal' - 'TF: TF binding' - 'dELS: distal Enhancer-like signal' - enhancer - genic - intergenic - negative control - 'pELS: proximal Enhancer-like signal' - promoter - name: region_type in: query required: false schema: type: string enum: - accessible dna elements - candidate cis regulatory element - tested elements - name: method in: query required: false schema: type: string enum: - CRISPR screen - ENCODE-rE2G - Perturb-seq - scE2G - name: files_fileset in: query required: false schema: type: string - name: biosample_term in: query required: false schema: type: string - name: biological_context in: query required: false schema: type: string - name: source in: query required: false schema: type: string enum: - ENCODE - IGVF - name: organism in: query required: false schema: type: string enum: - Homo sapiens default: Homo sapiens - name: verbose in: query required: false schema: type: string enum: - 'true' - 'false' default: 'false' - 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: name: type: string label: type: string method: type: string class: type: string source: type: string source_url: type: string biological_context: type: string biosample_term: type: string files_filesets: type: string crispr_modality: type: string nullable: true score: type: number nullable: true log2FC: type: number nullable: true effect_size: type: number nullable: true p_value: anyOf: - type: number - type: string nullable: true p_value_adj: anyOf: - type: number - type: string nullable: true neg_log10_pvalue: anyOf: - type: number - type: string nullable: true neg_log10_pvalue_adj: anyOf: - type: number - type: string nullable: true genomic_element: anyOf: - type: string - type: object properties: _id: type: string type: type: string nullable: true chr: type: string nullable: true start: type: number nullable: true end: type: number nullable: true name: type: string required: - _id - name additionalProperties: false gene: anyOf: - type: string - type: object properties: name: type: string _id: type: string start: type: number end: type: number chr: type: string required: - name - _id - start - end - chr additionalProperties: false required: - name - label - method - class - source - source_url - biological_context - biosample_term - files_filesets - genomic_element - gene 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 ````