The NCBI Sequence Viewer is an interactive, graphical tool designed to visualize biological sequence data mapped to a specific genome, nucleotide, or protein sequence. It acts as the core visualization engine for major bioinformatics platforms like the NCBI Genome Data Viewer (GDV) and Variation Viewer. The top 5 features of the tool include: 1. Dynamic Multi-Level Zooming and Navigation
Users can scale their view seamlessly from an entire chromosome or scaffold down to individual base pairs. By dragging the cursor across the coordinate ruler, you can select specific genomic regions to instantly zoom in or isolate sequences. When zoomed into the base-pair level, the tool reveals single nucleotides along with their corresponding 5’ to 3’ strand orientation. 2. Highly Customizable, Track-Based Display
Biological information is organized into separate horizontal “tracks,” which can be reordered using drag-and-drop or completely removed to clean up the interface. Individual track display configurations can be tweaked via a gear icon, allowing researchers to switch between different visualization models, such as expanding gene bars to show precise transcript and coding sequence (CDS) structures. 3. Integration with Local and Remote Data Formats
Beyond displaying default NCBI RefSeq annotations, the tool serves as a powerful hub for custom data integration. Users can upload and stream their own experimental datasets directly alongside public reference genomes. It supports several standard file formats, including: BAM (read alignments) VCF (variant call files) BED, GFF, and WIG (custom annotations and graphs) 4. Robust Search Capabilities
The integrated search tool allows users to locate precise features across massive datasets. It processes diverse inputs directly from the toolbar search box, including: Exact sequence coordinates Gene symbols or standard accessions Reference SNP IDs (rs numbers) and HGVS expressions Raw IUPAC sequence strings 5. Seamless Export and Analysis Pipelines
The Sequence Viewer functions as a launching pad for downstream analysis. Selected sequences can be copied directly to the clipboard, downloaded in FASTA or GenBank formats, or sent directly into an NCBI BLAST alignment job. Additionally, researchers can export custom gene annotation data as downloadable tables or generate high-quality track images for publications.
Are you planning to embed Sequence Viewer into your own website, or are you looking to upload and visualize custom genomic data like VCF/BAM files? Let me know so I can provide specific steps or documentation links! Graphical View Legend – NCBI – NIH
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