Most of the remaining old directories were moved to the archive in March Details of what FTP directories and files were moved are as follows. Data are provided for both GenBank and RefSeq assembly versions. The FTP directories for the latest version in each assembly chain, and directories for many older assembly versions, include a core set of files and formats plus additional files relevant to the data content of the specific assembly.
Yes, the FTP files for the latest version of an assembly are updated after the annotation on any of the sequences in the assembly changes. Files for old versions of assemblies will not usually be updated, consequently, most users will want to download data only for the latest version of each assembly. For more information, see " How can I download only the current version of each assembly?
GenBank content includes genome assemblies that are submitted to members of the International Nucleotide Sequence Database Collaboration. GenBank submissions may or may not include annotation information which, when provided, was generated by different groups using different methods.
In contrast, RefSeq genomes are selected from, and are a subset of, the available GenBank genomes and annotation data is available for all RefSeq genomes, except for some viruses.
For some assemblies, both GenBank and RefSeq content may be available. RefSeq genomes are a copy of the submitted GenBank assembly. In some cases the assemblies are not completely identical as RefSeq has chosen to add a non-nuclear organelle unit to the assembly or to drop very small contigs or reported contaminants. The base structure of the genomes ftp site includes several main directory areas that provide sequence and annotation content, or report files.
Sequence and annotation content is further organized by major taxonomic groupings, then by species, then by assembly. Sequence content is defined by the Assembly resource. The genomes FTP site provides directories for:. Assembly directories for all current assemblies, and for many previous assembly versions, include a core set of files and formats plus additional files relevant to the data content of the specific assembly.
Directories for old assembly versions that predate the genomes FTP site reorganization contain only the assembly report, assembly stats assembly status files. All data files are named according to the pattern: [assembly accession. A text file reporting the current status of this version of the assembly "latest", "replaced", or "suppressed". Any assembly anomalies are also reported.
Tab-delimited text file reporting the name, role and sequence accession. The file header contains meta-data for the assembly including: assembly name, assembly accession.
Tab-delimited text file reporting statistics for the assembly including: total length, ungapped length, contig scaffold counts, contig-N50, scaffold-L50, scaffold-N50, scaffold-N75 scaffold-N Provided for assemblies that include alternate or patch assembly units. Other files define how scaffolds and chromosomes are organized into non-nuclear and other assembly-units, and how any alternate or patch scaffolds are placed relative to the chromosomes.
Only present if the assembly has internal structure. Tab-delimited text file reporting locations and attributes for a subset of annotated features. Replaces the. FASTA format of the genomic sequence s in the assembly. Repetitive sequences in eukaryotes are masked to lower-case. The genomic. GenBank flat file format of the genomic sequence s in the assembly. Sequence identifiers are provided as accession.
Annotation of the genomic sequence s in Gene Transfer Format Version 2. Tab-delimited text file reporting the coordinates of all gaps in the top-level genomic sequences. The gaps reported include gaps specified in the AGP files, gaps annotated on the component sequences, and any other run of 10 or more Ns in the sequences.
Documentation of the RepeatMasker version, parameters, and library text format ; Provided for eukaryotes. GenBank flat file format of the WGS master for the assembly present only if a WGS master record exists for the sequences in the assembly. Tab-delimited text file reporting hash values for different aspects of the annotation data.
The hashes are useful to monitor for when annotation has changed in a way that is significant for a particular use case and warrants downloading the updated records. Assembly directories for RefSeq genomes annotated by the NCBI Eukaryotic Genome Annotation Pipeline include extra sub-directories and files in additon to the standard set of files and formats. FASTA format of the genomic sequence corresponding to pseudogene and other gene regions which do not have any associated transcribed RNA products or translated protein products.
It includes annotated gene regions that require rearrangement to provide the final product, e. These sequences are not assigned accession numbers, and are derived directly from the assembled genomic sequences. These alignments may have been used as evidence for gene prediction by the annotation pipeline.
These alignments were used as evidence for gene prediction by the annotation pipeline. These identifiers are NOT universally unique. They are unique per annotation release only. Matching genes and transcripts in the current and previous annotation releases binned by type of difference column 1 for genes and column 14 for transcripts , in tabular format. Genome Workbench project file for visualization and search of differences between the current and previous annotation releases.
Each annotation release corresponds to an annotation run. The annotation release identifiers AR are numbered sequentially starting at , independently of the assembly used.
An assembly may have been annotated multiple times, and be featured in different annotation release directories. The 'current' directory contains the data for the most recent annotation. For many organisms, only the most recent annotation may be available. This file provides information specific to the specific annotation release, including data freeze dates, release date and release number, and the annotated assemblies.
It contains information on the annotation release, including: Important dates associated with the annotation Assemblies Gene and feature statistics Masking results Transcript and protein alignments used for the annotation Assembly-assembly alignments used to track genes from the previous assembly to the current, or from the reference to an alternate assembly if relevant Assembly directory One directory for each genome assembly that was annotated in the release.
Named as [assembly accession. This directory contains the files provided for all genome assemblies plus those additional files provided for organisms annotated by the NCBI Eukaryotic Genome Annotation Pipeline. Genome assemblies of interest can be found using the search bar, advanced search page or browse by organism table provided by the Assembly resource.
GenBank or RefSeq data for the assembly can be obtained by following the links to the FTP site from the "Access the data" section of the right-hand sidebar. There can be many different genome assemblies available for species with medical, agricultural or scientific relevance.
Any changes to the sequences included in a particular assembly accession result in an increment of the assembly version, which means that an assembly accession. It also means that a particular assembly may have several versions, where only the most recent version is considered to be "latest", and earlier versions are marked as either "replaced" or "suppressed".
In some cases the last version of an assembly may be "suppressed", for example if it was removed from the RefSeq collection due to changes in scope or quality concerns. Only FTP files for the "latest" version of an assembly are updated when annotation is updated, new file formats are added or improvements to existing formats are released.
Consequently, most users will want to download data only for the latest version of each assembly. You can select data from only the latest assemblies in several ways:. The easiest way to download RefSeq data for all complete bacterial genomes is the use the genome download service in the Assembly resource, as described above. Alternatively, the assembly summary report files provide information that can be used to identify a set of assemblies of interest along with their FTP file paths.
All genomes assemblies linked to a particular BioProject can be downloaded using the genome download service in the Assembly resource described above.
We changed the sequence identifier format in the FASTA files to make our datasets more usable by the community. This format provides more information but requires that the individual sequence identifiers be parsed out of the compound string. K substr. Providing sequence and annotation files with matching sequence identifiers supports their use in commonly used RNA-Seq analysis packages and in other analysis pipelines that rely on simple string comparison to match sequence identifiers.
Certain symbols and punctuation marks have a special meaning to computer operating systems, consequently, they can cause problems if they are included as part of directory or file names. Examples include spaces, , , [, ] and '.
Of course, these wrapped lines should be on one line when you use them. Use esearch. Use elink. Use efetch. You can combine these with Boolean operators to retrieve, for example, all RefSeq genomic sequences:. For this example our goal will be to explore the genome data available for Corynebacterium efficiens. The results of the elink call reveal a total of eight sequences at the time of writing. In this way you can download data for the entire set. You can easily modify this script to, for example, read in species names from a file.
Hi, thanks for this great post. I tried to use this code to pull off all whole genome sequences for Microcystis aeruginosa. Please send your question to info ncbi.
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